Unigine::Widget Class

Working with Widgets#

The example below demonstrates how to create a single widget, a hierarchy of widgets, and subscribe for a widget's event.

AppWorldLogic.cpp

Source code (C++)

#include "AppWorldLogic.h"
#include <UnigineWidgets.h>

using namespace Unigine;

// EventConnections class instance to manage event subscriptions
EventConnections econnections;

void on_button_click(const WidgetPtr& button, int mbuttons)
{
	Log::message("world button click\n");
}

int AppWorldLogic::init()
{
	// create a single widget
	WidgetButtonPtr button = WidgetButton::create("WORLD_BUTTON");
	// subscribe for the Clicked event
	button->getEventClicked().connect(econnections, on_button_click);
	// add the button to WindowManager
	WindowManager::getMainWindow()->addChild(button);

	// create a hierarchy of widgets
	WidgetHBoxPtr hbox = WidgetHBox::create();
	hbox->setBackground(1);
	hbox->setBackgroundColor(Math::vec4_white);
	WindowManager::getMainWindow()->addChild(hbox, Gui::ALIGN_EXPAND);

	WidgetGroupBoxPtr group = WidgetGroupBox::create();
	group->setBackground(1);
	group->setText("Widgets Hierarchy");
	hbox->addChild(group);

	group->addChild(WidgetLabel::create("hierarchy_label_0"));
	group->addChild(WidgetLabel::create("hierarchy_label_1"));

	return 1;
}

int AppWorldLogic::shutdown()
{
	// removing all event subscriptions somewhere on shutdown
	econnections.disconnectAll();

	return 1;
}

Lifetime of Widgets#

By default each new widget's lifetime matches the lifetime of the Engine (i.e. the widget shall be deleted on Engine shutdown). But you can choose widget's lifetime to be managed:

By a separate window — in this case the widget is deleted automatically on deleting the window.
By the world — in this case the widget is deleted when the world is closed.
Manually — in this case the widget should be deleted manually.

The examples below show how the different lifetime management types work.

Managing Lifetime by the World#

In this example, the widgets appear on loading the world. When you reload or exit the world, or close the Engine window, the widgets are deleted as their lifetime is managed by the world. The corresponding messages will be shown in the console.

AppWorldLogic.cpp

Source code (C++)

#include "AppWorldLogic.h"
#include <UnigineWidgets.h>

using namespace Unigine;

// EventConnections class instance to manage event subscriptions
EventConnections econn;

void on_button_click(const WidgetPtr &button, int mbuttons)
{
	Log::message("world button click\n");
}

void on_button_remove(const WidgetPtr &button)
{
	Log::message("world button removed\n");
}

void on_hbox_remove(const WidgetPtr &hbox)
{
	Log::message("world hbox hierarchy removed\n");
}

int AppWorldLogic::init()
{

	// single world widget
	WidgetButtonPtr button = WidgetButton::create("WORLD_BUTTON");
	button->setLifetime(Widget::LIFETIME_WORLD);
	button->getEventClicked().connect(econn, on_button_click);
	button->getEventRemove().connect(econn, on_button_remove);
	WindowManager::getMainWindow()->addChild(button);

	// world hierarchy
	WidgetHBoxPtr hbox = WidgetHBox::create();
	hbox->setLifetime(Widget::LIFETIME_WORLD);
	hbox->getEventRemove().connect(econn, on_hbox_remove);
	hbox->setBackground(1);
	hbox->setBackgroundColor(Math::vec4_red);
	WindowManager::getMainWindow()->addChild(hbox, Gui::ALIGN_EXPAND);

	WidgetGroupBoxPtr group = WidgetGroupBox::create();
	group->setBackground(1);
	group->setText("World Hierarchy");
	hbox->addChild(group);

	group->addChild(WidgetLabel::create("hierarchy_world_label_0"));
	group->addChild(WidgetLabel::create("hierarchy_world_label_1"));

	return 1;
}

int AppWorldLogic::shutdown()
{
	// removing all event subscriptions
	econn.disconnectAll();

	return 1;
}

Managing Lifetime by the Window#

In this example, widgets appear in a separate window. When you close the window, the widgets are deleted as their lifetime is managed by this window. The console shows the following information:

Whether the window, button and hbox hierarchy are deleted or not.
Whether the remove callbacks are fired or not.
Messages from the remove callbacks.

After closing, the window can be re-created by pressing T.

AppSystemLogic.cpp

Source code (C++)

#include "AppSystemLogic.h"
#include <UnigineWidgets.h>

using namespace Unigine;

// EventConnections class instance to manage event subscriptions
EventConnections econnections;

EngineWindowViewportPtr window;

WidgetButtonPtr button;
WidgetHBoxPtr hbox;

bool button_remove_handler = false;
bool hbox_remove_handler = false;

void on_window_button_click()
{
	Log::message("window button click\n");
}

void on_window_button_remove()
{
	Log::message("window button removed\n");
	button_remove_handler = true;
}

void on_window_hbox_remove()
{
	Log::message("window hbox hierarchy removed\n");
	hbox_remove_handler = true;
}

void create_window()
{

	button_remove_handler = false;
	hbox_remove_handler = false;

	window = EngineWindowViewport::create("Test", 512, 256, EngineWindow::FLAGS_SHOWN);

	// single window widget
	button = WidgetButton::create("WINDOW_BUTTON");
	button->setLifetime(Widget::LIFETIME_WINDOW);
	button->getEventClicked().connect(econnections, on_window_button_click);
	button->getEventRemove().connect(econnections, on_window_button_remove);
	window->addChild(button);

	// window hierarchy
	hbox = WidgetHBox::create();
	hbox->setLifetime(Widget::LIFETIME_WINDOW);
	hbox->getEventRemove().connect(econnections, on_window_hbox_remove);
	hbox->setBackground(1);
	hbox->setBackgroundColor(Math::vec4_red);
	window->addChild(hbox, Gui::ALIGN_EXPAND);

	WidgetGroupBoxPtr group = WidgetGroupBox::create();
	group->setBackground(1);
	group->setText("Window Hierarchy");
	hbox->addChild(group);

	group->addChild(WidgetLabel::create("hierarchy_window_label_0"));
	group->addChild(WidgetLabel::create("hierarchy_window_label_1"));

}

int AppSystemLogic::init()
{

	create_window();

	return 1;
}

int AppSystemLogic::update()
{

	if (Input::isKeyDown(Input::KEY_T) && window.isDeleted())
		create_window();

	Log::message("window deleted: %d, button deleted: %d, hbox deleted: %d, button remove handler: %d, hbox remove handler: %d\n",
		window.isDeleted(), button.isDeleted(), hbox.isDeleted(), button_remove_handler, hbox_remove_handler);

	return 1;
}

int AppSystemLogic::shutdown()
{
	// removing all event subscriptions
	econnections.disconnectAll();

	return 1;
}

Managing Lifetime by the Engine#

Widgets are created on Engine initialization, and then added to a separate window. The console shows the following information:

Whether the window, button and hbox hierarchy are deleted or not.
Whether the remove callbacks are fired or not.
Messages from the remove callbacks.

If you close the window, it will be deleted and the information in the console will change. All the other widgets are deleted only on Engine shutdown, as their lifetime is managed by the Engine.

If the separate window is closed, press T to re-create it.

AppSystemLogic.cpp

Source code (C++)

#include "AppSystemLogic.h"
#include <UnigineWidgets.h>

using namespace Unigine;

// EventConnections class instance to manage event subscriptions
EventConnections econnections;

EngineWindowViewportPtr engine_window;

WidgetButtonPtr engine_button;
WidgetHBoxPtr engine_hbox;

bool engine_button_remove_handler = false;
bool engine_hbox_remove_handler = false;

void on_engine_button_click(const WidgetPtr &button, int mbuttons)
{
	Log::message("engine button click\n");
}

void on_engine_button_remove(const WidgetPtr &button)
{
	Log::message("engine button removed\n");
	engine_button_remove_handler = true;
}

void on_engine_hbox_remove(const WidgetPtr &hbox)
{
	Log::message("engine hbox hierarchy removed\n");
	engine_hbox_remove_handler = true;
}

void create_engine_window()
{

	engine_window = EngineWindowViewport::create("Test", 512, 256, EngineWindow::FLAGS_SHOWN);

	engine_window->addChild(engine_button);
	engine_window->addChild(engine_hbox, Gui::ALIGN_EXPAND);

}

int AppSystemLogic::init()
{

	engine_button_remove_handler = false;
	engine_hbox_remove_handler = false;

	// single engine widget
	engine_button = WidgetButton::create("ENGINE_BUTTON");
	engine_button->setLifetime(Widget::LIFETIME_ENGINE);
	engine_button->getEventClicked().connect(econnections, on_engine_button_click);
	engine_button->getEventRemove().connect(econnections, on_engine_button_remove);

	// engine hierarchy
	engine_hbox = WidgetHBox::create();
	engine_hbox->setLifetime(Widget::LIFETIME_ENGINE);
	engine_hbox->getEventRemove().connect(econnections, on_engine_hbox_remove);
	engine_hbox->setBackground(1);
	engine_hbox->setBackgroundColor(Math::vec4_red);

	WidgetGroupBoxPtr engine_group = WidgetGroupBox::create();
	engine_group->setBackground(1);
	engine_group->setText("Engine Hierarchy");
	engine_hbox->addChild(engine_group);

	engine_group->addChild(WidgetLabel::create("hierarchy_engine_label_0"));
	engine_group->addChild(WidgetLabel::create("hierarchy_engine_label_1"));

	create_engine_window();

	return 1;
}

int AppSystemLogic::update()
{

	if (Input::isKeyDown(Input::KEY_T) && engine_window.isDeleted())
		create_engine_window();

	Log::message("engine window deleted: %d, engine button deleted: %d, engine hbox deleted: %d, engine button remove handler: %d, engine hbox remove handler: %d\n",
		engine_window.isDeleted(), engine_button.isDeleted(), engine_hbox.isDeleted(), engine_button_remove_handler, engine_hbox_remove_handler);

	return 1;
}

int AppSystemLogic::shutdown()
{
	// removing all event subscriptions
	econnections.disconnectAll();

	return 1;
}

功能列表:

Name	描述 View: Sort by:
getNumChildren	Returns the current number of child widgets.
setFontWrap	Setter and Getter for value indicating if text wrapping to widget width is enabled.
getFontWrap
setFontRich	Setter and Getter for value indicating if rich text formatting is used.
getFontRich
setFontOutline	Setter and Getter for value indicating if widget text is rendered casting a shadow.
getFontOutline
setFontVOffset	Setter and Getter for vertical offset of the font used by the widget.
getFontVOffset
setFontHOffset	Setter and Getter for horizontal offset of the font used by the widget.
getFontHOffset
setFontVSpacing	Setter and Getter for spacing (in pixels) between widget text lines.
getFontVSpacing
setFontHSpacing	Setter and Getter for spacing (in pixels) between widget text characters.
getFontHSpacing
setFontPermanent	Setter and Getter for flag indicating if color of the widget text is not changed (for example, when the widget becomes inactive or loses focus).
getFontPermanent
setFontColor	Setter and Getter for color of the font used by the widget.
getFontColor	Setter and Getter for color of the font used by the widget.
setFontSize	Setter and Getter for size of the font used by the widget.
getFontSize	Setter and Getter for size of the font used by the widget.
setMouseCursor	Setter and Getter for current mouse pointer.
getMouseCursor	Setter and Getter for current mouse pointer.
getMouseY	Returns the current Y coordinate of the mouse pointer position in the widget's local space.
getMouseX	Returns the current X coordinate of the mouse pointer position in the widget's local space.
setHeight	Setter and Getter for widget minimal height.
getHeight	Setter and Getter for widget minimal height.
setWidth	Setter and Getter for widget minimal width.
getWidth	Setter and Getter for widget minimal width.
getScreenPositionY	Returns the current screen position of the widget (its top left corner) on the screen along the y axis.
getScreenPositionX	Returns the current screen position of the widget (its top left corner) on the screen along the x axis.
setPositionY	Setter and Getter for Y coordinate of the widget position relative to its parent.
getPositionY
setPositionX	Setter and Getter for X coordinate of the widget position relative to its parent.
getPositionX
setNextFocus	Setter and Getter for widget which will be focused next if the user presses TAB.
getNextFocus
setData	Setter and Getter for user data associated with the widget.
getData	Setter and Getter for user data associated with the widget.
setOrder	Setter and Getter for rendering order (Z-order) for the widget.
getOrder
setHidden	Setter and Getter for value indicating if the widget is hidden.
isHidden
setEnabled	Setter and Getter for value indicating if the widget is enabled (the user can interact with the widget).
isEnabled
setIntersectionEnabled	Setter and Getter for value indicating if intersection detection is enabled for the widget.
isIntersectionEnabled
setFlags	Setter and Getter for widget flags.
getFlags	Setter and Getter for widget flags.
setParent	Setter and Getter for pointer to the parent widget.
getParent	Setter and Getter for pointer to the parent widget.
getParentGui	Returns the current Gui instance that currently renders the widget's parent, if the widget has a parent.
getGui	Returns the current Gui instance that renders the widget.
getTypeName	Returns the current name of the widget type.
getType	Returns the current type of the widget.
isLayout	Returns the current value indicating if the widget is a layout.
isFixed	Returns the current value indicating if the widget is fixed.
isBackground	Returns the current value indicating if the widget is a background one.
isOverlapped	Returns the current value indicating if the widget is overlapped.
isExpanded	Returns the current value indicating if the widget is expanded.
setLifetime	Setter and Getter for lifetime management type for the root of the widget, or for the widget itself (if it is not a child for another widget).
getLifetime
getDpiScale	Returns the current DPI scale applied to the widget.
getRenderHeight	Returns the current widget frame height in pixels.
getRenderWidth	Returns the current widget frame width in pixels.
getEventRemove	The event triggered when a widget is removed.
getEventDragDrop	The event triggered when a drag-and-drop operation is performed with a widget.
getEventDragMove	The event triggered when a focused widget is moved.
getEventLeave	The event triggered when the mouse pointer leaves a widget.
getEventEnter	The event triggered when the mouse pointer enters a widget.
getEventTextPressed	The event triggered when a virtual key is pressed while a widget is in focus.
getEventKeyPressed	The event triggered when a key (by a scan code) is pressed while a widget is in focus.
getEventReleased	The event triggered when the mouse is released after clicking somewhere on a widget.
getEventPressed	The event triggered when a mouse button or ENTER (RETURN) is pressed, while the mouse pointer is somewhere on a widget.
getEventDoubleClicked	The event triggered when the mouse is double-clicked somewhere on a widget.
getEventClicked	The event triggered when the mouse is clicked somewhere on a widget.
getEventChanged	The event triggered when a widget has changed its state.
getEventFocusOut	The event triggered when a widget loses focus.
getEventFocusIn	The event triggered when a widget is focused.
getEventHide	The event triggered when a widget is removed using Gui::removeChild().
getEventShow	The event triggered when a widget is shown.
getChild	Returns a child widget with a given number.
isChild	Checks if a given widget is a child of the current one.
setFocus	Sets focus on the widget.
isFocused	Returns a value indicating if the widget is currently in focus.
setFont	Sets a true-type font (*.ttf) that will be used to render text on the widget by file path.
getIntersection	Checks for an intersection with the widget's bounds for the given point.
getHierarchyIntersection	Checks for an intersection with a widget that belongs to the hierarchy of the current widget.
getKeyActivity	Checks if a given key already has a special purpose for the widget.
setPermanentFocus	Sets permanent focus on the widget (it means that the widget is always in focus).
setPosition	Sets a position of the widget relative to its parent.
setToolTip	Sets a tooltip for the widget.
getToolTip	Returns the widget's tooltip text.
addAttach	Attaches a given widget to the current one.
addChild	Adds a child to the widget.
arrange	Rearranges the widget and its children to lay them out neatly.
raise	Brings a given widget to the top.
removeAttach	Detaches a given widget from the current one.
removeChild	Removes a child widget from the list of the widget's children.
removeFocus	Removes focus from the widget.
replaceChild	Replaces one child widget with another.
getLifetimeSelf	Returns the lifetime management type set for the widget.
toRenderSize	Transforms the unit value to the pixel value.
toUnitSize	Transforms the pixel value to the unit value.
toRenderSize	Transforms the unit value to the pixel value.
toUnitSize	Transforms the pixel value to the unit value.
getTextRenderSize	Returns the size (in pixels) of the specified text string rendered on the screen with taking into account all text output settings such as dpi, font size and style.
runEventShow	Emulates the Show event.
runEventHide	Emulates the Hide event.
runEventFocusIn	Emulates the FocusIn event.
runEventFocusOut	Emulates the FocusOut event.
runEventChanged	Emulates the Changed event.
runEventClicked	Emulates the Clicked event.
runEventDoubleClicked	Emulates the DoubleClicked event.
runEventPressed	Emulates the Pressed event.
runEventReleased	Emulates the Released event.
runEventKeyPressed	Emulates the KeyPressed event.
runEventTextPressed	Emulates the TextPressed event.
runEventEnter	Emulates the Enter event.
runEventLeave	Emulates the Leave event.
runEventDragMove	Emulates the DragMove event.
runEventDragDrop	Emulates the DragDrop event.

Widget Class

枚举

TYPE#

Name	描述
WIDGET_VBOX = 0	Vertical box. See also: WidgetVBox.
WIDGET_HBOX = 1	Horizontal box. See also: WidgetHBox.
WIDGET_GRID_BOX = 2	Grid box. See also: WidgetGridBox.
WIDGET_VPANED = 3	Vertical box that allows resizing of its children. See also: WidgetVPaned.
WIDGET_HPANED = 4	Horizontal box that allows resizing of its children. See also: WidgetHPaned.
WIDGET_LABEL = 5	Text label. See also: WidgetLabel.
WIDGET_BUTTON = 6	Simple button. See also: WidgetButton.
WIDGET_EDIT_LINE = 7	Text field. See also: WidgetEditline.
WIDGET_EDIT_TEXT = 8	Multiline text field. See also: WidgetEdittext.
WIDGET_CHECK_BOX = 9	Checkbox. See also: WidgetCheckbox.
WIDGET_COMBO_BOX = 10	Combobox. See also: WidgetCombobox.
WIDGET_CANVAS = 11	Canvas widget for drawing text, lines and polygons. See also: WidgetCanvas.
WIDGET_GROUP_BOX = 12	Group box. See also: WidgetGroupBox.
WIDGET_LIST_BOX = 13	List box. See also: WidgetListBox.
WIDGET_TREE_BOX = 14	Tree box. See also: WidgetTreeBox.
WIDGET_TAB_BOX = 15	Tabbed box. See also: WidgetTabBox.
WIDGET_SCROLL = 16	A scrollbar: horizontal or vertical one. See also: WidgetScroll.
WIDGET_SCROLL_BOX = 17	Box with scrolling. See also: WidgetScrollBox.
WIDGET_SPACER = 18	Spacer: horizontal or vertical one. See also: WidgetSpacer.
WIDGET_SLIDER = 19	A slider: horizontal or vertical one. See also: WidgetSlider.
WIDGET_SPIN_BOX = 20	Spinbox. See also: WidgetSpinBox.
WIDGET_SPIN_BOX_DOUBLE = 21	Spinbox with double values. See also: WidgetSpinBoxDouble.
WIDGET_ICON = 22	Icon. See also: WidgetIcon.
WIDGET_SPRITE = 23	Sprite. See also: WidgetSprite.
WIDGET_SPRITE_VIDEO = 24	Video Sprite. See also: WidgetSpriteVideo.
WIDGET_SPRITE_SHADER = 25	Shader Sprite. See also: WidgetSpriteShader.
WIDGET_SPRITE_VIEWPORT = 26	Viewport Sprite. See also: WidgetSpriteViewport.
WIDGET_SPRITE_NODE = 27	Node Sprite. See also: WidgetSpriteNode.
WIDGET_MENU_BAR = 28	Menu bar. See also: WidgetMenuBar.
WIDGET_MENU_BOX = 29	Menu. See also: WidgetMenuBox.
WIDGET_WINDOW = 30	Window. See also: WidgetWindow.
WIDGET_DIALOG = 31	Dialog window. See also: WidgetDialog.
WIDGET_DIALOG_MESSAGE = 32	Message Dialog. See also: WidgetDialogMessage.
WIDGET_DIALOG_FILE = 33	File Dialog. See also: WidgetDialogFile.
WIDGET_DIALOG_COLOR = 34	Color Dialog. See also: WidgetDialogColor.
WIDGET_DIALOG_IMAGE = 35	Image Dialog. See also: WidgetDialogImage.
WIDGET_MANIPULATOR = 36	Manipulator widget. See also: WidgetManipulator.
WIDGET_MANIPULATOR_TRANSLATOR = 37	Translator Manipulator. See also: WidgetManipulatorTranslator.
WIDGET_MANIPULATOR_ROTATOR = 38	Rotator Manipulator. See also: WidgetManipulatorRotator.
WIDGET_MANIPULATOR_SCALER = 39	Scaler Manipulator. See also: WidgetManipulatorScaler.
WIDGET_EXTERN = 40	External widget.
WIDGET_ENGINE = 41	Engine-specific widget (manipulator). See also: WidgetManipulator.
WIDGET_HIT_TEST_AREA = 42	Hit-Test Area. See also: WidgetHitTestArea.
NUM_WIDGETS = 43	Total number of widget types.

LIFETIME#

Name	描述
LIFETIME_WORLD = 0	Lifetime of the widget or user interface is managed by the world. The widget/user interface will be deleted automatically on closing the world.
LIFETIME_WINDOW = 1	Lifetime of the widget or user interface is managed by the window. The widget/user interface will be deleted automatically on deleting the window.
LIFETIME_ENGINE = 2	Lifetime of the widget or user interface is managed by the Engine. The widget/user interface will be deleted automatically on Engine shutdown. Notice When using this lifetime management type, the GUI instance can be empty for the widget: it will be assigned automatically when adding the widget to a window. For a user interface, the Gui instance must be set via the setGui() method.
LIFETIME_MANUAL = 3	Lifetime of the widget or user interface is managed by the user. The widget/user interface should be deleted manually. Notice When using this lifetime management type, the GUI instance can be empty for the widget: it will be assigned automatically when adding the widget to a window. For a user interface, the Gui instance must be set via the setGui() method.

Members

int getNumChildren() const#

Returns the current number of child widgets.

Return value

Current number of child widgets.

void setFontWrap ( int wrap ) #

Sets a new value indicating if text wrapping to widget width is enabled.

Arguments

int wrap - The value of 1 for text wrapping; otherwise, 0.

int getFontWrap() const#

Returns the current value indicating if text wrapping to widget width is enabled.

Return value

Current value of 1 for text wrapping; otherwise, 0.

void setFontRich ( int rich ) #

Sets a new value indicating if rich text formatting is used.

Arguments

int rich - The value of 1 for rich text formatting; otherwise, 0.

int getFontRich() const#

Returns the current value indicating if rich text formatting is used.

Return value

Current value of 1 for rich text formatting; otherwise, 0.

void setFontOutline ( int outline ) #

Sets a new value indicating if widget text is rendered casting a shadow. Positive or negative values determine the distance in pixels used to offset the font outline.

Arguments

int outline - The positive value if outline is offset in the bottom-right corner direction, negative value if outline is offset in the top-left corner direction. 0 if font is not outlined.

int getFontOutline() const#

Returns the current value indicating if widget text is rendered casting a shadow. Positive or negative values determine the distance in pixels used to offset the font outline.

Return value

Current positive value if outline is offset in the bottom-right corner direction, negative value if outline is offset in the top-left corner direction. 0 if font is not outlined.

void setFontVOffset ( int voffset ) #

Sets a new vertical offset of the font used by the widget.

Arguments

int voffset - The vertical offset value, in pixels.

int getFontVOffset() const#

Returns the current vertical offset of the font used by the widget.

Return value

Current vertical offset value, in pixels.

void setFontHOffset ( int hoffset ) #

Sets a new horizontal offset of the font used by the widget.

Arguments

int hoffset - The horizontal offset value, in pixels.

int getFontHOffset() const#

Returns the current horizontal offset of the font used by the widget.

Return value

Current horizontal offset value, in pixels.

void setFontVSpacing ( int vspacing ) #

Sets a new spacing (in pixels) between widget text lines.

Arguments

int vspacing - The vertical spacing value, in pixels.

int getFontVSpacing() const#

Returns the current spacing (in pixels) between widget text lines.

Return value

Current vertical spacing value, in pixels.

void setFontHSpacing ( int hspacing ) #

Sets a new spacing (in pixels) between widget text characters.

Arguments

int hspacing - The horizontal spacing value, in pixels.

int getFontHSpacing() const#

Returns the current spacing (in pixels) between widget text characters.

Return value

Current horizontal spacing value, in pixels.

void setFontPermanent ( int permanent ) #

Sets a new flag indicating if color of the widget text is not changed (for example, when the widget becomes inactive or loses focus).

Arguments

int permanent - The value of 1 to keep the text color unchanged; 0 to change it.

int getFontPermanent() const#

Returns the current flag indicating if color of the widget text is not changed (for example, when the widget becomes inactive or loses focus).

Return value

Current value of 1 to keep the text color unchanged; 0 to change it.

void setFontColor ( const Math::vec4& color ) #

Sets a new color of the font used by the widget.

Arguments

const Math::vec4& color - The font color.

Math::vec4 getFontColor() const#

Returns the current color of the font used by the widget.

Return value

Current font color.

void setFontSize ( int size ) #

Sets a new size of the font used by the widget.

Arguments

int size - The Font size in pixels.

int getFontSize() const#

Returns the current size of the font used by the widget.

Return value

Current Font size in pixels.

void setMouseCursor ( int cursor ) #

Sets a new current mouse pointer.

Arguments

int cursor - The mouse pointer. See the list of available pointers with CURSOR_* prefixes in the article on Gui class functions.

int getMouseCursor() const#

Returns the current current mouse pointer.

Return value

Current mouse pointer. See the list of available pointers with CURSOR_* prefixes in the article on Gui class functions.

int getMouseY() const#

Returns the current Y coordinate of the mouse pointer position in the widget's local space.

Return value

Current Y coordinate of the mouse pointer position in the widget's local space.

int getMouseX() const#

Returns the current X coordinate of the mouse pointer position in the widget's local space.

Return value

Current X coordinate of the mouse pointer position in the widget's local space.

void setHeight ( int height ) #

Sets a new widget minimal height.

Notice

The widget cannot be smaller than its content (the texture, video, etc.). It is only possible to make the widget bigger then the size of its content. For example, WidgetButton can be made bigger than its texture, but it cannot be made any smaller than the texture dimensions.

Arguments

int height - The widget minimal height, in pixels. If a negative value is provided, the value of 0 will be used instead.

int getHeight() const#

Returns the current widget minimal height.

Notice

Return value

Current widget minimal height, in pixels. If a negative value is provided, the value of 0 will be used instead.

void setWidth ( int width ) #

Sets a new widget minimal width.

Notice

Arguments

int width - The widget minimal width, in pixels. If a negative value is provided, the value of 0 will be used instead.

int getWidth() const#

Returns the current widget minimal width.

Notice

Return value

Current widget minimal width, in pixels. If a negative value is provided, the value of 0 will be used instead.

int getScreenPositionY() const#

Returns the current screen position of the widget (its top left corner) on the screen along the y axis.

Return value

Current screen position along the Y axis in pixels.

int getScreenPositionX() const#

Returns the current screen position of the widget (its top left corner) on the screen along the x axis.

Return value

Current screen position along the X axis in pixels.

void setPositionY ( int y ) #

Sets a new Y coordinate of the widget position relative to its parent.

Arguments

int y - The Y coordinate of the widget position relative to its parent.

int getPositionY() const#

Returns the current Y coordinate of the widget position relative to its parent.

Return value

Current Y coordinate of the widget position relative to its parent.

void setPositionX ( int x ) #

Sets a new X coordinate of the widget position relative to its parent.

Arguments

int x - The X coordinate of the widget position relative to its parent.

int getPositionX() const#

Returns the current X coordinate of the widget position relative to its parent.

Return value

Current X coordinate of the widget position relative to its parent.

void setNextFocus ( const Ptr<Widget>& focus ) #

Sets a new widget which will be focused next if the user presses TAB.

Arguments

const Ptr<Widget>& focus - The widget which will be focused next if the user presses TAB.

Ptr<Widget> getNextFocus() const#

Returns the current widget which will be focused next if the user presses TAB.

Return value

Current widget which will be focused next if the user presses TAB.

void setData ( const char * data ) #

Sets a new user data associated with the widget.

Arguments

const char * data - The user data associated with the widget. Data can be an xml formatted string.

const char * getData() const#

Returns the current user data associated with the widget.

Return value

Current user data associated with the widget. Data can be an xml formatted string.

void setOrder ( int order ) #

Sets a new rendering order (Z-order) for the widget. The higher the value, the higher the order of the widget is.

Notice

Works only for widgets added to GUI via the Gui::addChild() function with the Gui::ALIGN_OVERLAP flag specified (should not be Gui::ALIGN_FIXED).

Source code (C++)

Unigine::Vector<Unigine::WidgetSpritePtr> sprites;

int AppWorldLogic::init()
{
	// create 3 squares with different colors
	for (int i = 0; i < 3; i++)
	{
		WidgetSpritePtr &sprite = sprites.append();
		sprite = WidgetSprite::create(Gui::get(), "white.texture");
		sprite->setPosition(i * 40 + 50, i * 40 + 50);
		sprite->setWidth(100);
		sprite->setHeight(100);
		Gui::get()->addChild(sprite, Gui::ALIGN_OVERLAP);
	}

	sprites[0]->setColor(vec4(1, 0.3f, 0.3f, 1));
	sprites[1]->setColor(vec4(0.3f, 1, 0.3f, 1));
	sprites[2]->setColor(vec4(0.3f, 0.3f, 1, 1));

	return 1;
}

int AppWorldLogic::update()
{
	// press space key to random reorder squares
	if (App::clearKeyState(' '))
	{
		for (int i = 0; i < 3; i++)
		{
			sprites[i]->setOrder(Game::getRandomInt(0, 10));
			
			Gui::get()->removeChild(sprites[i]);
			Gui::get()->addChild(sprites[i]);

			Log::message("%d ", sprites[i]->getOrder());
		}
		Log::message("\n");
	}
	return 1;
}

Arguments

int order - The rendering order (z-order) for the widget, in the range [-128;127]. (126 for the Profiler, 127 for the Console).

int getOrder() const#

Returns the current rendering order (Z-order) for the widget. The higher the value, the higher the order of the widget is.

Notice

Works only for widgets added to GUI via the Gui::addChild() function with the Gui::ALIGN_OVERLAP flag specified (should not be Gui::ALIGN_FIXED).

Source code (C++)

Unigine::Vector<Unigine::WidgetSpritePtr> sprites;

int AppWorldLogic::init()
{
	// create 3 squares with different colors
	for (int i = 0; i < 3; i++)
	{
		WidgetSpritePtr &sprite = sprites.append();
		sprite = WidgetSprite::create(Gui::get(), "white.texture");
		sprite->setPosition(i * 40 + 50, i * 40 + 50);
		sprite->setWidth(100);
		sprite->setHeight(100);
		Gui::get()->addChild(sprite, Gui::ALIGN_OVERLAP);
	}

	sprites[0]->setColor(vec4(1, 0.3f, 0.3f, 1));
	sprites[1]->setColor(vec4(0.3f, 1, 0.3f, 1));
	sprites[2]->setColor(vec4(0.3f, 0.3f, 1, 1));

	return 1;
}

int AppWorldLogic::update()
{
	// press space key to random reorder squares
	if (App::clearKeyState(' '))
	{
		for (int i = 0; i < 3; i++)
		{
			sprites[i]->setOrder(Game::getRandomInt(0, 10));
			
			Gui::get()->removeChild(sprites[i]);
			Gui::get()->addChild(sprites[i]);

			Log::message("%d ", sprites[i]->getOrder());
		}
		Log::message("\n");
	}
	return 1;
}

Return value

Current rendering order (z-order) for the widget, in the range [-128;127]. (126 for the Profiler, 127 for the Console).

void setHidden ( bool hidden ) #

Sets a new value indicating if the widget is hidden.

Arguments

bool hidden - Set true to enable the hidden status for the widget; false - to disable it.

bool isHidden() const#

Returns the current value indicating if the widget is hidden.

Return value

true if the hidden status for the widget is enabled; otherwise false.

void setEnabled ( bool enabled ) #

Sets a new value indicating if the widget is enabled (the user can interact with the widget).

Arguments

bool enabled - Set true to enable the enabled (interactable) status for the widget; false - to disable it.

bool isEnabled() const#

Returns the current value indicating if the widget is enabled (the user can interact with the widget).

Return value

true if the enabled (interactable) status for the widget is enabled; otherwise false.

void setIntersectionEnabled ( bool enabled ) #

Sets a new value indicating if intersection detection is enabled for the widget.

Arguments

bool enabled - Set true to enable intersection detection for the widget; false - to disable it.

bool isIntersectionEnabled() const#

Returns the current value indicating if intersection detection is enabled for the widget.

Return value

true if intersection detection for the widget is enabled; otherwise false.

void setFlags ( int flags ) #

Sets a new widget flags.

Arguments

int flags - The widget flags, ALIGN_* pre-defined variables.

int getFlags() const#

Returns the current widget flags.

Return value

Current widget flags, ALIGN_* pre-defined variables.

void setParent ( const Ptr<Widget>& parent ) #

Sets a new pointer to the parent widget.

Arguments

const Ptr<Widget>& parent - The parent widget.

Ptr<Widget> getParent() const#

Returns the current pointer to the parent widget.

Return value

Current parent widget.

Ptr<Gui> getParentGui() const#

Returns the current Gui instance that currently renders the widget's parent, if the widget has a parent. (This function can be used if the widget is created and used in two different GUIs, for example, in case of the Interface plugin.)

Return value

Current GUI instance used for the widget's parent.

Ptr<Gui> getGui() const#

Returns the current Gui instance that renders the widget. (This function can be used if the widget is created and used in two different GUIs, for example, in case of the Interface plugin.) It can be called only by root widgets. For child widgets, see getParentGui().

Return value

Current GUI instance used for the widget.

const char * getTypeName() const#

Returns the current name of the widget type.

Return value

Current name of the widget type.

Widget::TYPE getType() const#

Returns the current type of the widget.

Return value

Current type of the widget.

bool isLayout() const#

Returns the current value indicating if the widget is a layout.

Return value

true if the widget is a layout; otherwise false.

bool isFixed() const#

Returns the current value indicating if the widget is fixed.

Return value

true if the widget is fixed; otherwise false.

bool isBackground() const#

Returns the current value indicating if the widget is a background one.

Return value

true if the widget is a background one; otherwise false.

bool isOverlapped() const#

Returns the current value indicating if the widget is overlapped.

Return value

true if the widget is overlapped; otherwise false.

bool isExpanded() const#

Returns the current value indicating if the widget is expanded.

Return value

true if the widget is expanded; otherwise false.

void setLifetime ( Widget::LIFETIME lifetime ) #

Sets a new lifetime management type for the root of the widget, or for the widget itself (if it is not a child for another widget).

NoticeLifetime of each widget in the hierarchy is defined by its root. Thus, lifetime management type set for a child widget that differs from the one set for the root is ignored.

Arguments

Widget::LIFETIME lifetime - The lifetime management type.

Widget::LIFETIME getLifetime() const#

Returns the current lifetime management type for the root of the widget, or for the widget itself (if it is not a child for another widget).

NoticeLifetime of each widget in the hierarchy is defined by its root. Thus, lifetime management type set for a child widget that differs from the one set for the root is ignored.

Return value

Current lifetime management type.

float getDpiScale() const#

Returns the current DPI scale applied to the widget.

Return value

Current DPI scale applied to the widget.

int getRenderHeight() const#

Returns the current widget frame height in pixels.

Return value

Current widget frame height in pixels.

int getRenderWidth() const#

Returns the current widget frame width in pixels.

Return value

Current widget frame width in pixels.

Event<const Ptr<Widget> &> getEventRemove() const#

event triggered when a widget is removed. You can subscribe to events via connect() and unsubscribe via disconnect(). You can also use EventConnection and EventConnections classes for convenience (see examples below).

Notice

For more details see the Event Handling article.

The event handler signature is as follows: myhandler(const Ptr<Widget> & widget)

Usage Example

Source code (C++)

// implement the Remove event handler
void remove_event_handler(const Ptr<Widget> & widget)
{
	Log::message("\Handling Remove event\n");
}


//////////////////////////////////////////////////////////////////////////////
//  1. Multiple subscriptions can be linked to an instance of the EventConnections 
//  class that you can use later to remove all these subscriptions at once
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnections class
EventConnections remove_event_connections;

// link to this instance when subscribing to an event (subscription to various events can be linked)
publisher->getEventRemove().connect(remove_event_connections, remove_event_handler);

// other subscriptions are also linked to this EventConnections instance 
// (e.g. you can subscribe using lambdas)
publisher->getEventRemove().connect(remove_event_connections, [](const Ptr<Widget> & widget) { 
		Log::message("\Handling Remove event (lambda).\n");
	}
);

// ...

// later all of these linked subscriptions can be removed with a single line
remove_event_connections.disconnectAll();

//////////////////////////////////////////////////////////////////////////////
//  2. You can subscribe and unsubscribe via an instance of the EventConnection 
//  class. And toggle this particular connection off and on, when necessary.
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnection class
EventConnection remove_event_connection;

// subscribe to the Remove event with a handler function keeping the connection
publisher->getEventRemove().connect(remove_event_connection, remove_event_handler);

// ...

// you can temporarily disable a particular event connection to perform certain actions
remove_event_connection.setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
remove_event_connection.setEnabled(true);

// ...

// remove subscription to the Remove event via the connection
remove_event_connection.disconnect();

//////////////////////////////////////////////////////////////////////////////
//  3. You can add EventConnection/EventConnections instance as a member of the
//  class that handles the event. In this case all linked subscriptions will be 
//  automatically removed when class destructor is called
//////////////////////////////////////////////////////////////////////////////

// Class handling the event
class SomeClass
{
public:
	// instance of the EventConnections class as a class member
	EventConnections e_connections;

	// A Remove event handler implemented as a class member
	void event_handler(const Ptr<Widget> & widget)
	{
		Log::message("\Handling Remove event\n");
		// ...
	}
};

SomeClass *sc = new SomeClass();

// ...

// specify a class instance in case a handler method belongs to some class
publisher->getEventRemove().connect(sc->e_connections, sc, &SomeClass::event_handler);

// ...

// handler class instance is deleted with all its subscriptions removed automatically
delete sc;


//////////////////////////////////////////////////////////////////////////////
//   4. Subscribe to an event saving a particular connection ID
//   and unsubscribe later by this ID
//////////////////////////////////////////////////////////////////////////////
// instance of the EventConnections class to manage event connections
EventConnections e_connections;

// define a particular connection ID to be used to unsubscribe later
EventConnectionId remove_handler_id;

// subscribe to the Remove event with a lambda handler function and keeping connection ID
remove_handler_id = publisher->getEventRemove().connect(e_connections, [](const Ptr<Widget> & widget) { 
		Log::message("\Handling Remove event (lambda).\n");
	}
);

// remove the subscription later using the ID
publisher->getEventRemove().disconnect(remove_handler_id);


//////////////////////////////////////////////////////////////////////////////
//   5. Ignoring all Remove events when necessary
//////////////////////////////////////////////////////////////////////////////

// you can temporarily disable the event to perform certain actions without triggering it
publisher->getEventRemove().setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
publisher->getEventRemove().setEnabled(true);

Return value

Event reference.

Event<const Ptr<Widget> &, const Ptr<Widget> &> getEventDragDrop() const#

event triggered when a drag-and-drop operation is performed with a widget. Supported by all widgets.. You can subscribe to events via connect() and unsubscribe via disconnect(). You can also use EventConnection and EventConnections classes for convenience (see examples below).

Notice

For more details see the Event Handling article.

The event handler signature is as follows: myhandler(const Ptr<Widget> & widget, const Ptr<Widget> & target_widget)

Usage Example

Source code (C++)

// implement the DragDrop event handler
void dragdrop_event_handler(const Ptr<Widget> & widget,  const Ptr<Widget> & target_widget)
{
	Log::message("\Handling DragDrop event\n");
}


//////////////////////////////////////////////////////////////////////////////
//  1. Multiple subscriptions can be linked to an instance of the EventConnections 
//  class that you can use later to remove all these subscriptions at once
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnections class
EventConnections dragdrop_event_connections;

// link to this instance when subscribing to an event (subscription to various events can be linked)
publisher->getEventDragDrop().connect(dragdrop_event_connections, dragdrop_event_handler);

// other subscriptions are also linked to this EventConnections instance 
// (e.g. you can subscribe using lambdas)
publisher->getEventDragDrop().connect(dragdrop_event_connections, [](const Ptr<Widget> & widget,  const Ptr<Widget> & target_widget) { 
		Log::message("\Handling DragDrop event (lambda).\n");
	}
);

// ...

// later all of these linked subscriptions can be removed with a single line
dragdrop_event_connections.disconnectAll();

//////////////////////////////////////////////////////////////////////////////
//  2. You can subscribe and unsubscribe via an instance of the EventConnection 
//  class. And toggle this particular connection off and on, when necessary.
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnection class
EventConnection dragdrop_event_connection;

// subscribe to the DragDrop event with a handler function keeping the connection
publisher->getEventDragDrop().connect(dragdrop_event_connection, dragdrop_event_handler);

// ...

// you can temporarily disable a particular event connection to perform certain actions
dragdrop_event_connection.setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
dragdrop_event_connection.setEnabled(true);

// ...

// remove subscription to the DragDrop event via the connection
dragdrop_event_connection.disconnect();

//////////////////////////////////////////////////////////////////////////////
//  3. You can add EventConnection/EventConnections instance as a member of the
//  class that handles the event. In this case all linked subscriptions will be 
//  automatically removed when class destructor is called
//////////////////////////////////////////////////////////////////////////////

// Class handling the event
class SomeClass
{
public:
	// instance of the EventConnections class as a class member
	EventConnections e_connections;

	// A DragDrop event handler implemented as a class member
	void event_handler(const Ptr<Widget> & widget,  const Ptr<Widget> & target_widget)
	{
		Log::message("\Handling DragDrop event\n");
		// ...
	}
};

SomeClass *sc = new SomeClass();

// ...

// specify a class instance in case a handler method belongs to some class
publisher->getEventDragDrop().connect(sc->e_connections, sc, &SomeClass::event_handler);

// ...

// handler class instance is deleted with all its subscriptions removed automatically
delete sc;


//////////////////////////////////////////////////////////////////////////////
//   4. Subscribe to an event saving a particular connection ID
//   and unsubscribe later by this ID
//////////////////////////////////////////////////////////////////////////////
// instance of the EventConnections class to manage event connections
EventConnections e_connections;

// define a particular connection ID to be used to unsubscribe later
EventConnectionId dragdrop_handler_id;

// subscribe to the DragDrop event with a lambda handler function and keeping connection ID
dragdrop_handler_id = publisher->getEventDragDrop().connect(e_connections, [](const Ptr<Widget> & widget,  const Ptr<Widget> & target_widget) { 
		Log::message("\Handling DragDrop event (lambda).\n");
	}
);

// remove the subscription later using the ID
publisher->getEventDragDrop().disconnect(dragdrop_handler_id);


//////////////////////////////////////////////////////////////////////////////
//   5. Ignoring all DragDrop events when necessary
//////////////////////////////////////////////////////////////////////////////

// you can temporarily disable the event to perform certain actions without triggering it
publisher->getEventDragDrop().setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
publisher->getEventDragDrop().setEnabled(true);

Return value

Event reference.

Event<const Ptr<Widget> &, const Ptr<Widget> &> getEventDragMove() const#

event triggered when a focused widget is moved. You can subscribe to events via connect() and unsubscribe via disconnect(). You can also use EventConnection and EventConnections classes for convenience (see examples below).

Notice

For more details see the Event Handling article.

The event handler signature is as follows: myhandler(const Ptr<Widget> & widget, const Ptr<Widget> & underlying_widget)

Usage Example

Source code (C++)

// implement the DragMove event handler
void dragmove_event_handler(const Ptr<Widget> & widget,  const Ptr<Widget> & underlying_widget)
{
	Log::message("\Handling DragMove event\n");
}


//////////////////////////////////////////////////////////////////////////////
//  1. Multiple subscriptions can be linked to an instance of the EventConnections 
//  class that you can use later to remove all these subscriptions at once
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnections class
EventConnections dragmove_event_connections;

// link to this instance when subscribing to an event (subscription to various events can be linked)
publisher->getEventDragMove().connect(dragmove_event_connections, dragmove_event_handler);

// other subscriptions are also linked to this EventConnections instance 
// (e.g. you can subscribe using lambdas)
publisher->getEventDragMove().connect(dragmove_event_connections, [](const Ptr<Widget> & widget,  const Ptr<Widget> & underlying_widget) { 
		Log::message("\Handling DragMove event (lambda).\n");
	}
);

// ...

// later all of these linked subscriptions can be removed with a single line
dragmove_event_connections.disconnectAll();

//////////////////////////////////////////////////////////////////////////////
//  2. You can subscribe and unsubscribe via an instance of the EventConnection 
//  class. And toggle this particular connection off and on, when necessary.
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnection class
EventConnection dragmove_event_connection;

// subscribe to the DragMove event with a handler function keeping the connection
publisher->getEventDragMove().connect(dragmove_event_connection, dragmove_event_handler);

// ...

// you can temporarily disable a particular event connection to perform certain actions
dragmove_event_connection.setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
dragmove_event_connection.setEnabled(true);

// ...

// remove subscription to the DragMove event via the connection
dragmove_event_connection.disconnect();

//////////////////////////////////////////////////////////////////////////////
//  3. You can add EventConnection/EventConnections instance as a member of the
//  class that handles the event. In this case all linked subscriptions will be 
//  automatically removed when class destructor is called
//////////////////////////////////////////////////////////////////////////////

// Class handling the event
class SomeClass
{
public:
	// instance of the EventConnections class as a class member
	EventConnections e_connections;

	// A DragMove event handler implemented as a class member
	void event_handler(const Ptr<Widget> & widget,  const Ptr<Widget> & underlying_widget)
	{
		Log::message("\Handling DragMove event\n");
		// ...
	}
};

SomeClass *sc = new SomeClass();

// ...

// specify a class instance in case a handler method belongs to some class
publisher->getEventDragMove().connect(sc->e_connections, sc, &SomeClass::event_handler);

// ...

// handler class instance is deleted with all its subscriptions removed automatically
delete sc;


//////////////////////////////////////////////////////////////////////////////
//   4. Subscribe to an event saving a particular connection ID
//   and unsubscribe later by this ID
//////////////////////////////////////////////////////////////////////////////
// instance of the EventConnections class to manage event connections
EventConnections e_connections;

// define a particular connection ID to be used to unsubscribe later
EventConnectionId dragmove_handler_id;

// subscribe to the DragMove event with a lambda handler function and keeping connection ID
dragmove_handler_id = publisher->getEventDragMove().connect(e_connections, [](const Ptr<Widget> & widget,  const Ptr<Widget> & underlying_widget) { 
		Log::message("\Handling DragMove event (lambda).\n");
	}
);

// remove the subscription later using the ID
publisher->getEventDragMove().disconnect(dragmove_handler_id);


//////////////////////////////////////////////////////////////////////////////
//   5. Ignoring all DragMove events when necessary
//////////////////////////////////////////////////////////////////////////////

// you can temporarily disable the event to perform certain actions without triggering it
publisher->getEventDragMove().setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
publisher->getEventDragMove().setEnabled(true);

Return value

Event reference.

Event<const Ptr<Widget> &> getEventLeave() const#

event triggered when the mouse pointer leaves a widget. Supported by all widgets. You can subscribe to events via connect() and unsubscribe via disconnect(). You can also use EventConnection and EventConnections classes for convenience (see examples below).

Notice

For more details see the Event Handling article.

The event handler signature is as follows: myhandler(const Ptr<Widget> & widget)

Usage Example

Source code (C++)

// implement the Leave event handler
void leave_event_handler(const Ptr<Widget> & widget)
{
	Log::message("\Handling Leave event\n");
}


//////////////////////////////////////////////////////////////////////////////
//  1. Multiple subscriptions can be linked to an instance of the EventConnections 
//  class that you can use later to remove all these subscriptions at once
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnections class
EventConnections leave_event_connections;

// link to this instance when subscribing to an event (subscription to various events can be linked)
publisher->getEventLeave().connect(leave_event_connections, leave_event_handler);

// other subscriptions are also linked to this EventConnections instance 
// (e.g. you can subscribe using lambdas)
publisher->getEventLeave().connect(leave_event_connections, [](const Ptr<Widget> & widget) { 
		Log::message("\Handling Leave event (lambda).\n");
	}
);

// ...

// later all of these linked subscriptions can be removed with a single line
leave_event_connections.disconnectAll();

//////////////////////////////////////////////////////////////////////////////
//  2. You can subscribe and unsubscribe via an instance of the EventConnection 
//  class. And toggle this particular connection off and on, when necessary.
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnection class
EventConnection leave_event_connection;

// subscribe to the Leave event with a handler function keeping the connection
publisher->getEventLeave().connect(leave_event_connection, leave_event_handler);

// ...

// you can temporarily disable a particular event connection to perform certain actions
leave_event_connection.setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
leave_event_connection.setEnabled(true);

// ...

// remove subscription to the Leave event via the connection
leave_event_connection.disconnect();

//////////////////////////////////////////////////////////////////////////////
//  3. You can add EventConnection/EventConnections instance as a member of the
//  class that handles the event. In this case all linked subscriptions will be 
//  automatically removed when class destructor is called
//////////////////////////////////////////////////////////////////////////////

// Class handling the event
class SomeClass
{
public:
	// instance of the EventConnections class as a class member
	EventConnections e_connections;

	// A Leave event handler implemented as a class member
	void event_handler(const Ptr<Widget> & widget)
	{
		Log::message("\Handling Leave event\n");
		// ...
	}
};

SomeClass *sc = new SomeClass();

// ...

// specify a class instance in case a handler method belongs to some class
publisher->getEventLeave().connect(sc->e_connections, sc, &SomeClass::event_handler);

// ...

// handler class instance is deleted with all its subscriptions removed automatically
delete sc;


//////////////////////////////////////////////////////////////////////////////
//   4. Subscribe to an event saving a particular connection ID
//   and unsubscribe later by this ID
//////////////////////////////////////////////////////////////////////////////
// instance of the EventConnections class to manage event connections
EventConnections e_connections;

// define a particular connection ID to be used to unsubscribe later
EventConnectionId leave_handler_id;

// subscribe to the Leave event with a lambda handler function and keeping connection ID
leave_handler_id = publisher->getEventLeave().connect(e_connections, [](const Ptr<Widget> & widget) { 
		Log::message("\Handling Leave event (lambda).\n");
	}
);

// remove the subscription later using the ID
publisher->getEventLeave().disconnect(leave_handler_id);


//////////////////////////////////////////////////////////////////////////////
//   5. Ignoring all Leave events when necessary
//////////////////////////////////////////////////////////////////////////////

// you can temporarily disable the event to perform certain actions without triggering it
publisher->getEventLeave().setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
publisher->getEventLeave().setEnabled(true);

Return value

Event reference.

Event<const Ptr<Widget> &> getEventEnter() const#

event triggered when the mouse pointer enters a widget. Supported by all widgets. You can subscribe to events via connect() and unsubscribe via disconnect(). You can also use EventConnection and EventConnections classes for convenience (see examples below).

Notice

For more details see the Event Handling article.

The event handler signature is as follows: myhandler(const Ptr<Widget> & widget)

Usage Example

Source code (C++)

// implement the Enter event handler
void enter_event_handler(const Ptr<Widget> & widget)
{
	Log::message("\Handling Enter event\n");
}


//////////////////////////////////////////////////////////////////////////////
//  1. Multiple subscriptions can be linked to an instance of the EventConnections 
//  class that you can use later to remove all these subscriptions at once
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnections class
EventConnections enter_event_connections;

// link to this instance when subscribing to an event (subscription to various events can be linked)
publisher->getEventEnter().connect(enter_event_connections, enter_event_handler);

// other subscriptions are also linked to this EventConnections instance 
// (e.g. you can subscribe using lambdas)
publisher->getEventEnter().connect(enter_event_connections, [](const Ptr<Widget> & widget) { 
		Log::message("\Handling Enter event (lambda).\n");
	}
);

// ...

// later all of these linked subscriptions can be removed with a single line
enter_event_connections.disconnectAll();

//////////////////////////////////////////////////////////////////////////////
//  2. You can subscribe and unsubscribe via an instance of the EventConnection 
//  class. And toggle this particular connection off and on, when necessary.
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnection class
EventConnection enter_event_connection;

// subscribe to the Enter event with a handler function keeping the connection
publisher->getEventEnter().connect(enter_event_connection, enter_event_handler);

// ...

// you can temporarily disable a particular event connection to perform certain actions
enter_event_connection.setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
enter_event_connection.setEnabled(true);

// ...

// remove subscription to the Enter event via the connection
enter_event_connection.disconnect();

//////////////////////////////////////////////////////////////////////////////
//  3. You can add EventConnection/EventConnections instance as a member of the
//  class that handles the event. In this case all linked subscriptions will be 
//  automatically removed when class destructor is called
//////////////////////////////////////////////////////////////////////////////

// Class handling the event
class SomeClass
{
public:
	// instance of the EventConnections class as a class member
	EventConnections e_connections;

	// A Enter event handler implemented as a class member
	void event_handler(const Ptr<Widget> & widget)
	{
		Log::message("\Handling Enter event\n");
		// ...
	}
};

SomeClass *sc = new SomeClass();

// ...

// specify a class instance in case a handler method belongs to some class
publisher->getEventEnter().connect(sc->e_connections, sc, &SomeClass::event_handler);

// ...

// handler class instance is deleted with all its subscriptions removed automatically
delete sc;


//////////////////////////////////////////////////////////////////////////////
//   4. Subscribe to an event saving a particular connection ID
//   and unsubscribe later by this ID
//////////////////////////////////////////////////////////////////////////////
// instance of the EventConnections class to manage event connections
EventConnections e_connections;

// define a particular connection ID to be used to unsubscribe later
EventConnectionId enter_handler_id;

// subscribe to the Enter event with a lambda handler function and keeping connection ID
enter_handler_id = publisher->getEventEnter().connect(e_connections, [](const Ptr<Widget> & widget) { 
		Log::message("\Handling Enter event (lambda).\n");
	}
);

// remove the subscription later using the ID
publisher->getEventEnter().disconnect(enter_handler_id);


//////////////////////////////////////////////////////////////////////////////
//   5. Ignoring all Enter events when necessary
//////////////////////////////////////////////////////////////////////////////

// you can temporarily disable the event to perform certain actions without triggering it
publisher->getEventEnter().setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
publisher->getEventEnter().setEnabled(true);

Return value

Event reference.

Event<const Ptr<Widget> &, unsigned int> getEventTextPressed() const#

event triggered when a virtual key is pressed while a widget is in focus. Supported by the following widgets:

Virtual key - is a value to which a scan code was converted by an Operating System (e.g., the Q scan code will have the Q virtual key on a QWERTY-keyboard, while on an AZERTY-keyboard it will have the A virtual key; or NUMPAD_DIGIT_7 scan code can be translated into virtual NUMPAD_HOME or NUMPAD_DIGIT_7 depending on the current Num Lock state. Virtual keys are used, when it is important to know what exactly did user type (not just the physical button, but rather a letter).
You can subscribe to events via connect() and unsubscribe via disconnect(). You can also use EventConnection and EventConnections classes for convenience (see examples below).

Notice

For more details see the Event Handling article.

The event handler signature is as follows: myhandler(const Ptr<Widget> & widget, unsigned int unicode)

Usage Example

Source code (C++)

// implement the TextPressed event handler
void textpressed_event_handler(const Ptr<Widget> & widget,  unsigned int unicode)
{
	Log::message("\Handling TextPressed event\n");
}


//////////////////////////////////////////////////////////////////////////////
//  1. Multiple subscriptions can be linked to an instance of the EventConnections 
//  class that you can use later to remove all these subscriptions at once
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnections class
EventConnections textpressed_event_connections;

// link to this instance when subscribing to an event (subscription to various events can be linked)
publisher->getEventTextPressed().connect(textpressed_event_connections, textpressed_event_handler);

// other subscriptions are also linked to this EventConnections instance 
// (e.g. you can subscribe using lambdas)
publisher->getEventTextPressed().connect(textpressed_event_connections, [](const Ptr<Widget> & widget,  unsigned int unicode) { 
		Log::message("\Handling TextPressed event (lambda).\n");
	}
);

// ...

// later all of these linked subscriptions can be removed with a single line
textpressed_event_connections.disconnectAll();

//////////////////////////////////////////////////////////////////////////////
//  2. You can subscribe and unsubscribe via an instance of the EventConnection 
//  class. And toggle this particular connection off and on, when necessary.
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnection class
EventConnection textpressed_event_connection;

// subscribe to the TextPressed event with a handler function keeping the connection
publisher->getEventTextPressed().connect(textpressed_event_connection, textpressed_event_handler);

// ...

// you can temporarily disable a particular event connection to perform certain actions
textpressed_event_connection.setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
textpressed_event_connection.setEnabled(true);

// ...

// remove subscription to the TextPressed event via the connection
textpressed_event_connection.disconnect();

//////////////////////////////////////////////////////////////////////////////
//  3. You can add EventConnection/EventConnections instance as a member of the
//  class that handles the event. In this case all linked subscriptions will be 
//  automatically removed when class destructor is called
//////////////////////////////////////////////////////////////////////////////

// Class handling the event
class SomeClass
{
public:
	// instance of the EventConnections class as a class member
	EventConnections e_connections;

	// A TextPressed event handler implemented as a class member
	void event_handler(const Ptr<Widget> & widget,  unsigned int unicode)
	{
		Log::message("\Handling TextPressed event\n");
		// ...
	}
};

SomeClass *sc = new SomeClass();

// ...

// specify a class instance in case a handler method belongs to some class
publisher->getEventTextPressed().connect(sc->e_connections, sc, &SomeClass::event_handler);

// ...

// handler class instance is deleted with all its subscriptions removed automatically
delete sc;


//////////////////////////////////////////////////////////////////////////////
//   4. Subscribe to an event saving a particular connection ID
//   and unsubscribe later by this ID
//////////////////////////////////////////////////////////////////////////////
// instance of the EventConnections class to manage event connections
EventConnections e_connections;

// define a particular connection ID to be used to unsubscribe later
EventConnectionId textpressed_handler_id;

// subscribe to the TextPressed event with a lambda handler function and keeping connection ID
textpressed_handler_id = publisher->getEventTextPressed().connect(e_connections, [](const Ptr<Widget> & widget,  unsigned int unicode) { 
		Log::message("\Handling TextPressed event (lambda).\n");
	}
);

// remove the subscription later using the ID
publisher->getEventTextPressed().disconnect(textpressed_handler_id);


//////////////////////////////////////////////////////////////////////////////
//   5. Ignoring all TextPressed events when necessary
//////////////////////////////////////////////////////////////////////////////

// you can temporarily disable the event to perform certain actions without triggering it
publisher->getEventTextPressed().setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
publisher->getEventTextPressed().setEnabled(true);

Return value

Event reference.

Event<const Ptr<Widget> &, int> getEventKeyPressed() const#

event triggered when when a key (by a scan code) is pressed while a widget is in focus. Supported by the following widgets:

Scan code - is a code assigned to avery key on the keyboard. Keyboard drivers use scan codes to detect which key is pressed. Scan codes are assigned to keys on the hardware level and are not affected by the states of modifiers like Caps Lock, Num Lock, Scroll Lock, Shift, Alt, and Ctrl making it possible to implement identical control on different types of keyboards (uiQWERTY, AZERTY, QWERTC, etc.). Scan codes are used when only a physical position of a key (a button) is important (e.g. in the ControlsApp class or Console key).
You can subscribe to events via connect() and unsubscribe via disconnect(). You can also use EventConnection and EventConnections classes for convenience (see examples below).

Notice

For more details see the Event Handling article.

The event handler signature is as follows: myhandler(const Ptr<Widget> & widget, int key)

Usage Example

Source code (C++)

// implement the KeyPressed event handler
void keypressed_event_handler(const Ptr<Widget> & widget,  int key)
{
	Log::message("\Handling KeyPressed event\n");
}


//////////////////////////////////////////////////////////////////////////////
//  1. Multiple subscriptions can be linked to an instance of the EventConnections 
//  class that you can use later to remove all these subscriptions at once
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnections class
EventConnections keypressed_event_connections;

// link to this instance when subscribing to an event (subscription to various events can be linked)
publisher->getEventKeyPressed().connect(keypressed_event_connections, keypressed_event_handler);

// other subscriptions are also linked to this EventConnections instance 
// (e.g. you can subscribe using lambdas)
publisher->getEventKeyPressed().connect(keypressed_event_connections, [](const Ptr<Widget> & widget,  int key) { 
		Log::message("\Handling KeyPressed event (lambda).\n");
	}
);

// ...

// later all of these linked subscriptions can be removed with a single line
keypressed_event_connections.disconnectAll();

//////////////////////////////////////////////////////////////////////////////
//  2. You can subscribe and unsubscribe via an instance of the EventConnection 
//  class. And toggle this particular connection off and on, when necessary.
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnection class
EventConnection keypressed_event_connection;

// subscribe to the KeyPressed event with a handler function keeping the connection
publisher->getEventKeyPressed().connect(keypressed_event_connection, keypressed_event_handler);

// ...

// you can temporarily disable a particular event connection to perform certain actions
keypressed_event_connection.setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
keypressed_event_connection.setEnabled(true);

// ...

// remove subscription to the KeyPressed event via the connection
keypressed_event_connection.disconnect();

//////////////////////////////////////////////////////////////////////////////
//  3. You can add EventConnection/EventConnections instance as a member of the
//  class that handles the event. In this case all linked subscriptions will be 
//  automatically removed when class destructor is called
//////////////////////////////////////////////////////////////////////////////

// Class handling the event
class SomeClass
{
public:
	// instance of the EventConnections class as a class member
	EventConnections e_connections;

	// A KeyPressed event handler implemented as a class member
	void event_handler(const Ptr<Widget> & widget,  int key)
	{
		Log::message("\Handling KeyPressed event\n");
		// ...
	}
};

SomeClass *sc = new SomeClass();

// ...

// specify a class instance in case a handler method belongs to some class
publisher->getEventKeyPressed().connect(sc->e_connections, sc, &SomeClass::event_handler);

// ...

// handler class instance is deleted with all its subscriptions removed automatically
delete sc;


//////////////////////////////////////////////////////////////////////////////
//   4. Subscribe to an event saving a particular connection ID
//   and unsubscribe later by this ID
//////////////////////////////////////////////////////////////////////////////
// instance of the EventConnections class to manage event connections
EventConnections e_connections;

// define a particular connection ID to be used to unsubscribe later
EventConnectionId keypressed_handler_id;

// subscribe to the KeyPressed event with a lambda handler function and keeping connection ID
keypressed_handler_id = publisher->getEventKeyPressed().connect(e_connections, [](const Ptr<Widget> & widget,  int key) { 
		Log::message("\Handling KeyPressed event (lambda).\n");
	}
);

// remove the subscription later using the ID
publisher->getEventKeyPressed().disconnect(keypressed_handler_id);


//////////////////////////////////////////////////////////////////////////////
//   5. Ignoring all KeyPressed events when necessary
//////////////////////////////////////////////////////////////////////////////

// you can temporarily disable the event to perform certain actions without triggering it
publisher->getEventKeyPressed().setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
publisher->getEventKeyPressed().setEnabled(true);

Return value

Event reference.

Event<const Ptr<Widget> &, int> getEventReleased() const#

event triggered when the mouse is released after clicking somewhere on a widget. Supported by the following widgets:

WidgetButton
WidgetGroupBox
WidgetIcon
WidgetManipulatorRotator (mouse_buttons is always 0)
WidgetManipulatorScaler (mouse_buttons is always 0)
WidgetManipulatorTranslator (mouse_buttons is always 0)
WidgetSlider
WidgetSpinBox
WidgetSpinBoxDouble
WidgetWindow
EngineWindow (mouse_buttons is always 0)

You can subscribe to events via connect() and unsubscribe via disconnect(). You can also use EventConnection and EventConnections classes for convenience (see examples below).

Notice

For more details see the Event Handling article.

The event handler signature is as follows: myhandler(const Ptr<Widget> & widget, int mouse_buttons)

The mouse_buttons argument is a mask representing a combination of the following flags: Gui::MOUSE_MASK_LEFT | Gui::MOUSE_MASK_MIDDLE | Gui::MOUSE_MASK_RIGHT.

Usage Example:

Source code (C++)

// auxiliary variable simplifying subscriptions management
EventConnections econn;

// ...

// creating a button widget
auto widget_button = WidgetButton::create(WindowManager::getMainWindow()->getGui(), "button");
WindowManager::getMainWindow()->getGui()->addChild(widget_button, Gui::ALIGN_OVERLAP | Gui::ALIGN_FIXED);

// enabling Console onscreen overlay
Console::setOnscreen(true);

// subscribing to the Released event with a lambda-handler
widget_button->getEventReleased().connect(econn, [](WidgetPtr const& widget, int mouse_buttons) {
	int left = mouse_buttons & Gui::MOUSE_MASK_LEFT;
	int right = mouse_buttons & Gui::MOUSE_MASK_RIGHT;
	int middle = mouse_buttons & Gui::MOUSE_MASK_MIDDLE;
	
	// displaying information on the currently released mouse buttons
	Console::onscreenMessageLine(
		"getEventReleased(mouse_buttons: %s %s %s)",
		left ? "left" : "",
		right ? "right" : "",
		middle ? "middle" : ""
	);
});

Usage Example

Source code (C++)

// implement the Released event handler
void released_event_handler(const Ptr<Widget> & widget,  int mouse_buttons)
{
	Log::message("\Handling Released event\n");
}


//////////////////////////////////////////////////////////////////////////////
//  1. Multiple subscriptions can be linked to an instance of the EventConnections 
//  class that you can use later to remove all these subscriptions at once
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnections class
EventConnections released_event_connections;

// link to this instance when subscribing to an event (subscription to various events can be linked)
publisher->getEventReleased().connect(released_event_connections, released_event_handler);

// other subscriptions are also linked to this EventConnections instance 
// (e.g. you can subscribe using lambdas)
publisher->getEventReleased().connect(released_event_connections, [](const Ptr<Widget> & widget,  int mouse_buttons) { 
		Log::message("\Handling Released event (lambda).\n");
	}
);

// ...

// later all of these linked subscriptions can be removed with a single line
released_event_connections.disconnectAll();

//////////////////////////////////////////////////////////////////////////////
//  2. You can subscribe and unsubscribe via an instance of the EventConnection 
//  class. And toggle this particular connection off and on, when necessary.
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnection class
EventConnection released_event_connection;

// subscribe to the Released event with a handler function keeping the connection
publisher->getEventReleased().connect(released_event_connection, released_event_handler);

// ...

// you can temporarily disable a particular event connection to perform certain actions
released_event_connection.setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
released_event_connection.setEnabled(true);

// ...

// remove subscription to the Released event via the connection
released_event_connection.disconnect();

//////////////////////////////////////////////////////////////////////////////
//  3. You can add EventConnection/EventConnections instance as a member of the
//  class that handles the event. In this case all linked subscriptions will be 
//  automatically removed when class destructor is called
//////////////////////////////////////////////////////////////////////////////

// Class handling the event
class SomeClass
{
public:
	// instance of the EventConnections class as a class member
	EventConnections e_connections;

	// A Released event handler implemented as a class member
	void event_handler(const Ptr<Widget> & widget,  int mouse_buttons)
	{
		Log::message("\Handling Released event\n");
		// ...
	}
};

SomeClass *sc = new SomeClass();

// ...

// specify a class instance in case a handler method belongs to some class
publisher->getEventReleased().connect(sc->e_connections, sc, &SomeClass::event_handler);

// ...

// handler class instance is deleted with all its subscriptions removed automatically
delete sc;


//////////////////////////////////////////////////////////////////////////////
//   4. Subscribe to an event saving a particular connection ID
//   and unsubscribe later by this ID
//////////////////////////////////////////////////////////////////////////////
// instance of the EventConnections class to manage event connections
EventConnections e_connections;

// define a particular connection ID to be used to unsubscribe later
EventConnectionId released_handler_id;

// subscribe to the Released event with a lambda handler function and keeping connection ID
released_handler_id = publisher->getEventReleased().connect(e_connections, [](const Ptr<Widget> & widget,  int mouse_buttons) { 
		Log::message("\Handling Released event (lambda).\n");
	}
);

// remove the subscription later using the ID
publisher->getEventReleased().disconnect(released_handler_id);


//////////////////////////////////////////////////////////////////////////////
//   5. Ignoring all Released events when necessary
//////////////////////////////////////////////////////////////////////////////

// you can temporarily disable the event to perform certain actions without triggering it
publisher->getEventReleased().setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
publisher->getEventReleased().setEnabled(true);

Return value

Event reference.

Event<const Ptr<Widget> &, int> getEventPressed() const#

event triggered when a mouse button or ENTER (RETURN) is pressed, while the mouse pointer is somewhere on a widget. Supported by the following widgets:

You can subscribe to events via connect() and unsubscribe via disconnect(). You can also use EventConnection and EventConnections classes for convenience (see examples below).

Notice

For more details see the Event Handling article.

The event handler signature is as follows: myhandler(const Ptr<Widget> & widget, int mouse_buttons)

The mouse_buttons argument is a mask representing a combination of the following flags: Gui::MOUSE_MASK_LEFT | Gui::MOUSE_MASK_MIDDLE | Gui::MOUSE_MASK_RIGHT.

Usage Example:

Source code (C++)

// auxiliary variable simplifying subscriptions management
EventConnections econn;

// ...

// creating a button widget
auto widget_button = WidgetButton::create(WindowManager::getMainWindow()->getGui(), "button");
WindowManager::getMainWindow()->getGui()->addChild(widget_button, Gui::ALIGN_OVERLAP | Gui::ALIGN_FIXED);

// enabling Console onscreen overlay
Console::setOnscreen(true);

// subscribing to the Pressed event with a lambda-handler
widget_button->getEventPressed().connect(econn, [](WidgetPtr const& widget, int mouse_buttons) {
	int left = mouse_buttons & Gui::MOUSE_MASK_LEFT;
	int right = mouse_buttons & Gui::MOUSE_MASK_RIGHT;
	int middle = mouse_buttons & Gui::MOUSE_MASK_MIDDLE;
	
	// displaying information on the currently pressed mouse buttons
	Console::onscreenMessageLine(
		"getEventPressed(mouse_buttons: %s %s %s)",
		left ? "left" : "",
		right ? "right" : "",
		middle ? "middle" : ""
	);
});

Usage Example

Source code (C++)

// implement the Pressed event handler
void pressed_event_handler(const Ptr<Widget> & widget,  int mouse_buttons)
{
	Log::message("\Handling Pressed event\n");
}


//////////////////////////////////////////////////////////////////////////////
//  1. Multiple subscriptions can be linked to an instance of the EventConnections 
//  class that you can use later to remove all these subscriptions at once
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnections class
EventConnections pressed_event_connections;

// link to this instance when subscribing to an event (subscription to various events can be linked)
publisher->getEventPressed().connect(pressed_event_connections, pressed_event_handler);

// other subscriptions are also linked to this EventConnections instance 
// (e.g. you can subscribe using lambdas)
publisher->getEventPressed().connect(pressed_event_connections, [](const Ptr<Widget> & widget,  int mouse_buttons) { 
		Log::message("\Handling Pressed event (lambda).\n");
	}
);

// ...

// later all of these linked subscriptions can be removed with a single line
pressed_event_connections.disconnectAll();

//////////////////////////////////////////////////////////////////////////////
//  2. You can subscribe and unsubscribe via an instance of the EventConnection 
//  class. And toggle this particular connection off and on, when necessary.
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnection class
EventConnection pressed_event_connection;

// subscribe to the Pressed event with a handler function keeping the connection
publisher->getEventPressed().connect(pressed_event_connection, pressed_event_handler);

// ...

// you can temporarily disable a particular event connection to perform certain actions
pressed_event_connection.setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
pressed_event_connection.setEnabled(true);

// ...

// remove subscription to the Pressed event via the connection
pressed_event_connection.disconnect();

//////////////////////////////////////////////////////////////////////////////
//  3. You can add EventConnection/EventConnections instance as a member of the
//  class that handles the event. In this case all linked subscriptions will be 
//  automatically removed when class destructor is called
//////////////////////////////////////////////////////////////////////////////

// Class handling the event
class SomeClass
{
public:
	// instance of the EventConnections class as a class member
	EventConnections e_connections;

	// A Pressed event handler implemented as a class member
	void event_handler(const Ptr<Widget> & widget,  int mouse_buttons)
	{
		Log::message("\Handling Pressed event\n");
		// ...
	}
};

SomeClass *sc = new SomeClass();

// ...

// specify a class instance in case a handler method belongs to some class
publisher->getEventPressed().connect(sc->e_connections, sc, &SomeClass::event_handler);

// ...

// handler class instance is deleted with all its subscriptions removed automatically
delete sc;


//////////////////////////////////////////////////////////////////////////////
//   4. Subscribe to an event saving a particular connection ID
//   and unsubscribe later by this ID
//////////////////////////////////////////////////////////////////////////////
// instance of the EventConnections class to manage event connections
EventConnections e_connections;

// define a particular connection ID to be used to unsubscribe later
EventConnectionId pressed_handler_id;

// subscribe to the Pressed event with a lambda handler function and keeping connection ID
pressed_handler_id = publisher->getEventPressed().connect(e_connections, [](const Ptr<Widget> & widget,  int mouse_buttons) { 
		Log::message("\Handling Pressed event (lambda).\n");
	}
);

// remove the subscription later using the ID
publisher->getEventPressed().disconnect(pressed_handler_id);


//////////////////////////////////////////////////////////////////////////////
//   5. Ignoring all Pressed events when necessary
//////////////////////////////////////////////////////////////////////////////

// you can temporarily disable the event to perform certain actions without triggering it
publisher->getEventPressed().setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
publisher->getEventPressed().setEnabled(true);

Return value

Event reference.

Event<const Ptr<Widget> &> getEventDoubleClicked() const#

event triggered when the mouse is double-clicked somewhere on a widget. Supported by the following widgets:

You can subscribe to events via connect() and unsubscribe via disconnect(). You can also use EventConnection and EventConnections classes for convenience (see examples below).

Notice

For more details see the Event Handling article.

The event handler signature is as follows: myhandler(const Ptr<Widget> & widget)

Usage Example

Source code (C++)

// implement the DoubleClicked event handler
void doubleclicked_event_handler(const Ptr<Widget> & widget)
{
	Log::message("\Handling DoubleClicked event\n");
}


//////////////////////////////////////////////////////////////////////////////
//  1. Multiple subscriptions can be linked to an instance of the EventConnections 
//  class that you can use later to remove all these subscriptions at once
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnections class
EventConnections doubleclicked_event_connections;

// link to this instance when subscribing to an event (subscription to various events can be linked)
publisher->getEventDoubleClicked().connect(doubleclicked_event_connections, doubleclicked_event_handler);

// other subscriptions are also linked to this EventConnections instance 
// (e.g. you can subscribe using lambdas)
publisher->getEventDoubleClicked().connect(doubleclicked_event_connections, [](const Ptr<Widget> & widget) { 
		Log::message("\Handling DoubleClicked event (lambda).\n");
	}
);

// ...

// later all of these linked subscriptions can be removed with a single line
doubleclicked_event_connections.disconnectAll();

//////////////////////////////////////////////////////////////////////////////
//  2. You can subscribe and unsubscribe via an instance of the EventConnection 
//  class. And toggle this particular connection off and on, when necessary.
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnection class
EventConnection doubleclicked_event_connection;

// subscribe to the DoubleClicked event with a handler function keeping the connection
publisher->getEventDoubleClicked().connect(doubleclicked_event_connection, doubleclicked_event_handler);

// ...

// you can temporarily disable a particular event connection to perform certain actions
doubleclicked_event_connection.setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
doubleclicked_event_connection.setEnabled(true);

// ...

// remove subscription to the DoubleClicked event via the connection
doubleclicked_event_connection.disconnect();

//////////////////////////////////////////////////////////////////////////////
//  3. You can add EventConnection/EventConnections instance as a member of the
//  class that handles the event. In this case all linked subscriptions will be 
//  automatically removed when class destructor is called
//////////////////////////////////////////////////////////////////////////////

// Class handling the event
class SomeClass
{
public:
	// instance of the EventConnections class as a class member
	EventConnections e_connections;

	// A DoubleClicked event handler implemented as a class member
	void event_handler(const Ptr<Widget> & widget)
	{
		Log::message("\Handling DoubleClicked event\n");
		// ...
	}
};

SomeClass *sc = new SomeClass();

// ...

// specify a class instance in case a handler method belongs to some class
publisher->getEventDoubleClicked().connect(sc->e_connections, sc, &SomeClass::event_handler);

// ...

// handler class instance is deleted with all its subscriptions removed automatically
delete sc;


//////////////////////////////////////////////////////////////////////////////
//   4. Subscribe to an event saving a particular connection ID
//   and unsubscribe later by this ID
//////////////////////////////////////////////////////////////////////////////
// instance of the EventConnections class to manage event connections
EventConnections e_connections;

// define a particular connection ID to be used to unsubscribe later
EventConnectionId doubleclicked_handler_id;

// subscribe to the DoubleClicked event with a lambda handler function and keeping connection ID
doubleclicked_handler_id = publisher->getEventDoubleClicked().connect(e_connections, [](const Ptr<Widget> & widget) { 
		Log::message("\Handling DoubleClicked event (lambda).\n");
	}
);

// remove the subscription later using the ID
publisher->getEventDoubleClicked().disconnect(doubleclicked_handler_id);


//////////////////////////////////////////////////////////////////////////////
//   5. Ignoring all DoubleClicked events when necessary
//////////////////////////////////////////////////////////////////////////////

// you can temporarily disable the event to perform certain actions without triggering it
publisher->getEventDoubleClicked().setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
publisher->getEventDoubleClicked().setEnabled(true);

Return value

Event reference.

Event<const Ptr<Widget> &, int> getEventClicked() const#

event triggered when the mouse is clicked somewhere on a widget. Supported by the following widgets:

You can subscribe to events via connect() and unsubscribe via disconnect(). You can also use EventConnection and EventConnections classes for convenience (see examples below).

Notice

For more details see the Event Handling article.

The event handler signature is as follows: myhandler(const Ptr<Widget> & widget, int mouse_buttons)

The mouse_buttons argument is a mask representing a combination of the following flags: Gui::MOUSE_MASK_LEFT | Gui::MOUSE_MASK_MIDDLE | Gui::MOUSE_MASK_RIGHT.

Usage Example:

Source code (C++)

// auxiliary variable simplifying subscriptions management
EventConnections econn;

// ...

// creating a button widget
auto widget_button = WidgetButton::create(WindowManager::getMainWindow()->getGui(), "button");
WindowManager::getMainWindow()->getGui()->addChild(widget_button, Gui::ALIGN_OVERLAP | Gui::ALIGN_FIXED);

// enabling Console onscreen overlay
Console::setOnscreen(true);

// subscribing to the Clicked event with a lambda-handler
widget_button->getEventClicked().connect(econn, [](WidgetPtr const& widget, int mouse_buttons) {
	int left = mouse_buttons & Gui::MOUSE_MASK_LEFT;
	int right = mouse_buttons & Gui::MOUSE_MASK_RIGHT;
	int middle = mouse_buttons & Gui::MOUSE_MASK_MIDDLE;
	
	// displaying information on the currently clicked mouse buttons
	Console::onscreenMessageLine(
		"getEventClicked(mouse_buttons: %s %s %s)",
		left ? "left" : "",
		right ? "right" : "",
		middle ? "middle" : ""
	);
});

Usage Example

Source code (C++)

// implement the Clicked event handler
void clicked_event_handler(const Ptr<Widget> & widget,  int mouse_buttons)
{
	Log::message("\Handling Clicked event\n");
}


//////////////////////////////////////////////////////////////////////////////
//  1. Multiple subscriptions can be linked to an instance of the EventConnections 
//  class that you can use later to remove all these subscriptions at once
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnections class
EventConnections clicked_event_connections;

// link to this instance when subscribing to an event (subscription to various events can be linked)
publisher->getEventClicked().connect(clicked_event_connections, clicked_event_handler);

// other subscriptions are also linked to this EventConnections instance 
// (e.g. you can subscribe using lambdas)
publisher->getEventClicked().connect(clicked_event_connections, [](const Ptr<Widget> & widget,  int mouse_buttons) { 
		Log::message("\Handling Clicked event (lambda).\n");
	}
);

// ...

// later all of these linked subscriptions can be removed with a single line
clicked_event_connections.disconnectAll();

//////////////////////////////////////////////////////////////////////////////
//  2. You can subscribe and unsubscribe via an instance of the EventConnection 
//  class. And toggle this particular connection off and on, when necessary.
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnection class
EventConnection clicked_event_connection;

// subscribe to the Clicked event with a handler function keeping the connection
publisher->getEventClicked().connect(clicked_event_connection, clicked_event_handler);

// ...

// you can temporarily disable a particular event connection to perform certain actions
clicked_event_connection.setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
clicked_event_connection.setEnabled(true);

// ...

// remove subscription to the Clicked event via the connection
clicked_event_connection.disconnect();

//////////////////////////////////////////////////////////////////////////////
//  3. You can add EventConnection/EventConnections instance as a member of the
//  class that handles the event. In this case all linked subscriptions will be 
//  automatically removed when class destructor is called
//////////////////////////////////////////////////////////////////////////////

// Class handling the event
class SomeClass
{
public:
	// instance of the EventConnections class as a class member
	EventConnections e_connections;

	// A Clicked event handler implemented as a class member
	void event_handler(const Ptr<Widget> & widget,  int mouse_buttons)
	{
		Log::message("\Handling Clicked event\n");
		// ...
	}
};

SomeClass *sc = new SomeClass();

// ...

// specify a class instance in case a handler method belongs to some class
publisher->getEventClicked().connect(sc->e_connections, sc, &SomeClass::event_handler);

// ...

// handler class instance is deleted with all its subscriptions removed automatically
delete sc;


//////////////////////////////////////////////////////////////////////////////
//   4. Subscribe to an event saving a particular connection ID
//   and unsubscribe later by this ID
//////////////////////////////////////////////////////////////////////////////
// instance of the EventConnections class to manage event connections
EventConnections e_connections;

// define a particular connection ID to be used to unsubscribe later
EventConnectionId clicked_handler_id;

// subscribe to the Clicked event with a lambda handler function and keeping connection ID
clicked_handler_id = publisher->getEventClicked().connect(e_connections, [](const Ptr<Widget> & widget,  int mouse_buttons) { 
		Log::message("\Handling Clicked event (lambda).\n");
	}
);

// remove the subscription later using the ID
publisher->getEventClicked().disconnect(clicked_handler_id);


//////////////////////////////////////////////////////////////////////////////
//   5. Ignoring all Clicked events when necessary
//////////////////////////////////////////////////////////////////////////////

// you can temporarily disable the event to perform certain actions without triggering it
publisher->getEventClicked().setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
publisher->getEventClicked().setEnabled(true);

Return value

Event reference.

Event<const Ptr<Widget> &> getEventChanged() const#

event triggered when a widget has changed its state. Supported by the following widgets:

You can subscribe to events via connect() and unsubscribe via disconnect(). You can also use EventConnection and EventConnections classes for convenience (see examples below).

Notice

For more details see the Event Handling article.

The event handler signature is as follows: myhandler(const Ptr<Widget> & widget)

Usage Example

Source code (C++)

// implement the Changed event handler
void changed_event_handler(const Ptr<Widget> & widget)
{
	Log::message("\Handling Changed event\n");
}


//////////////////////////////////////////////////////////////////////////////
//  1. Multiple subscriptions can be linked to an instance of the EventConnections 
//  class that you can use later to remove all these subscriptions at once
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnections class
EventConnections changed_event_connections;

// link to this instance when subscribing to an event (subscription to various events can be linked)
publisher->getEventChanged().connect(changed_event_connections, changed_event_handler);

// other subscriptions are also linked to this EventConnections instance 
// (e.g. you can subscribe using lambdas)
publisher->getEventChanged().connect(changed_event_connections, [](const Ptr<Widget> & widget) { 
		Log::message("\Handling Changed event (lambda).\n");
	}
);

// ...

// later all of these linked subscriptions can be removed with a single line
changed_event_connections.disconnectAll();

//////////////////////////////////////////////////////////////////////////////
//  2. You can subscribe and unsubscribe via an instance of the EventConnection 
//  class. And toggle this particular connection off and on, when necessary.
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnection class
EventConnection changed_event_connection;

// subscribe to the Changed event with a handler function keeping the connection
publisher->getEventChanged().connect(changed_event_connection, changed_event_handler);

// ...

// you can temporarily disable a particular event connection to perform certain actions
changed_event_connection.setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
changed_event_connection.setEnabled(true);

// ...

// remove subscription to the Changed event via the connection
changed_event_connection.disconnect();

//////////////////////////////////////////////////////////////////////////////
//  3. You can add EventConnection/EventConnections instance as a member of the
//  class that handles the event. In this case all linked subscriptions will be 
//  automatically removed when class destructor is called
//////////////////////////////////////////////////////////////////////////////

// Class handling the event
class SomeClass
{
public:
	// instance of the EventConnections class as a class member
	EventConnections e_connections;

	// A Changed event handler implemented as a class member
	void event_handler(const Ptr<Widget> & widget)
	{
		Log::message("\Handling Changed event\n");
		// ...
	}
};

SomeClass *sc = new SomeClass();

// ...

// specify a class instance in case a handler method belongs to some class
publisher->getEventChanged().connect(sc->e_connections, sc, &SomeClass::event_handler);

// ...

// handler class instance is deleted with all its subscriptions removed automatically
delete sc;


//////////////////////////////////////////////////////////////////////////////
//   4. Subscribe to an event saving a particular connection ID
//   and unsubscribe later by this ID
//////////////////////////////////////////////////////////////////////////////
// instance of the EventConnections class to manage event connections
EventConnections e_connections;

// define a particular connection ID to be used to unsubscribe later
EventConnectionId changed_handler_id;

// subscribe to the Changed event with a lambda handler function and keeping connection ID
changed_handler_id = publisher->getEventChanged().connect(e_connections, [](const Ptr<Widget> & widget) { 
		Log::message("\Handling Changed event (lambda).\n");
	}
);

// remove the subscription later using the ID
publisher->getEventChanged().disconnect(changed_handler_id);


//////////////////////////////////////////////////////////////////////////////
//   5. Ignoring all Changed events when necessary
//////////////////////////////////////////////////////////////////////////////

// you can temporarily disable the event to perform certain actions without triggering it
publisher->getEventChanged().setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
publisher->getEventChanged().setEnabled(true);

Return value

Event reference.

Event<const Ptr<Widget> &> getEventFocusOut() const#

event triggered when a widget loses focus. Supported by all widgets. You can subscribe to events via connect() and unsubscribe via disconnect(). You can also use EventConnection and EventConnections classes for convenience (see examples below).

Notice

For more details see the Event Handling article.

The event handler signature is as follows: myhandler(const Ptr<Widget> & widget)

Usage Example

Source code (C++)

// implement the FocusOut event handler
void focusout_event_handler(const Ptr<Widget> & widget)
{
	Log::message("\Handling FocusOut event\n");
}


//////////////////////////////////////////////////////////////////////////////
//  1. Multiple subscriptions can be linked to an instance of the EventConnections 
//  class that you can use later to remove all these subscriptions at once
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnections class
EventConnections focusout_event_connections;

// link to this instance when subscribing to an event (subscription to various events can be linked)
publisher->getEventFocusOut().connect(focusout_event_connections, focusout_event_handler);

// other subscriptions are also linked to this EventConnections instance 
// (e.g. you can subscribe using lambdas)
publisher->getEventFocusOut().connect(focusout_event_connections, [](const Ptr<Widget> & widget) { 
		Log::message("\Handling FocusOut event (lambda).\n");
	}
);

// ...

// later all of these linked subscriptions can be removed with a single line
focusout_event_connections.disconnectAll();

//////////////////////////////////////////////////////////////////////////////
//  2. You can subscribe and unsubscribe via an instance of the EventConnection 
//  class. And toggle this particular connection off and on, when necessary.
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnection class
EventConnection focusout_event_connection;

// subscribe to the FocusOut event with a handler function keeping the connection
publisher->getEventFocusOut().connect(focusout_event_connection, focusout_event_handler);

// ...

// you can temporarily disable a particular event connection to perform certain actions
focusout_event_connection.setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
focusout_event_connection.setEnabled(true);

// ...

// remove subscription to the FocusOut event via the connection
focusout_event_connection.disconnect();

//////////////////////////////////////////////////////////////////////////////
//  3. You can add EventConnection/EventConnections instance as a member of the
//  class that handles the event. In this case all linked subscriptions will be 
//  automatically removed when class destructor is called
//////////////////////////////////////////////////////////////////////////////

// Class handling the event
class SomeClass
{
public:
	// instance of the EventConnections class as a class member
	EventConnections e_connections;

	// A FocusOut event handler implemented as a class member
	void event_handler(const Ptr<Widget> & widget)
	{
		Log::message("\Handling FocusOut event\n");
		// ...
	}
};

SomeClass *sc = new SomeClass();

// ...

// specify a class instance in case a handler method belongs to some class
publisher->getEventFocusOut().connect(sc->e_connections, sc, &SomeClass::event_handler);

// ...

// handler class instance is deleted with all its subscriptions removed automatically
delete sc;


//////////////////////////////////////////////////////////////////////////////
//   4. Subscribe to an event saving a particular connection ID
//   and unsubscribe later by this ID
//////////////////////////////////////////////////////////////////////////////
// instance of the EventConnections class to manage event connections
EventConnections e_connections;

// define a particular connection ID to be used to unsubscribe later
EventConnectionId focusout_handler_id;

// subscribe to the FocusOut event with a lambda handler function and keeping connection ID
focusout_handler_id = publisher->getEventFocusOut().connect(e_connections, [](const Ptr<Widget> & widget) { 
		Log::message("\Handling FocusOut event (lambda).\n");
	}
);

// remove the subscription later using the ID
publisher->getEventFocusOut().disconnect(focusout_handler_id);


//////////////////////////////////////////////////////////////////////////////
//   5. Ignoring all FocusOut events when necessary
//////////////////////////////////////////////////////////////////////////////

// you can temporarily disable the event to perform certain actions without triggering it
publisher->getEventFocusOut().setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
publisher->getEventFocusOut().setEnabled(true);

Return value

Event reference.

Event<const Ptr<Widget> &> getEventFocusIn() const#

event triggered when a widget is focused. Supported by all widgets. You can subscribe to events via connect() and unsubscribe via disconnect(). You can also use EventConnection and EventConnections classes for convenience (see examples below).

Notice

For more details see the Event Handling article.

The event handler signature is as follows: myhandler(const Ptr<Widget> & widget)

Usage Example

Source code (C++)

// implement the FocusIn event handler
void focusin_event_handler(const Ptr<Widget> & widget)
{
	Log::message("\Handling FocusIn event\n");
}


//////////////////////////////////////////////////////////////////////////////
//  1. Multiple subscriptions can be linked to an instance of the EventConnections 
//  class that you can use later to remove all these subscriptions at once
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnections class
EventConnections focusin_event_connections;

// link to this instance when subscribing to an event (subscription to various events can be linked)
publisher->getEventFocusIn().connect(focusin_event_connections, focusin_event_handler);

// other subscriptions are also linked to this EventConnections instance 
// (e.g. you can subscribe using lambdas)
publisher->getEventFocusIn().connect(focusin_event_connections, [](const Ptr<Widget> & widget) { 
		Log::message("\Handling FocusIn event (lambda).\n");
	}
);

// ...

// later all of these linked subscriptions can be removed with a single line
focusin_event_connections.disconnectAll();

//////////////////////////////////////////////////////////////////////////////
//  2. You can subscribe and unsubscribe via an instance of the EventConnection 
//  class. And toggle this particular connection off and on, when necessary.
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnection class
EventConnection focusin_event_connection;

// subscribe to the FocusIn event with a handler function keeping the connection
publisher->getEventFocusIn().connect(focusin_event_connection, focusin_event_handler);

// ...

// you can temporarily disable a particular event connection to perform certain actions
focusin_event_connection.setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
focusin_event_connection.setEnabled(true);

// ...

// remove subscription to the FocusIn event via the connection
focusin_event_connection.disconnect();

//////////////////////////////////////////////////////////////////////////////
//  3. You can add EventConnection/EventConnections instance as a member of the
//  class that handles the event. In this case all linked subscriptions will be 
//  automatically removed when class destructor is called
//////////////////////////////////////////////////////////////////////////////

// Class handling the event
class SomeClass
{
public:
	// instance of the EventConnections class as a class member
	EventConnections e_connections;

	// A FocusIn event handler implemented as a class member
	void event_handler(const Ptr<Widget> & widget)
	{
		Log::message("\Handling FocusIn event\n");
		// ...
	}
};

SomeClass *sc = new SomeClass();

// ...

// specify a class instance in case a handler method belongs to some class
publisher->getEventFocusIn().connect(sc->e_connections, sc, &SomeClass::event_handler);

// ...

// handler class instance is deleted with all its subscriptions removed automatically
delete sc;


//////////////////////////////////////////////////////////////////////////////
//   4. Subscribe to an event saving a particular connection ID
//   and unsubscribe later by this ID
//////////////////////////////////////////////////////////////////////////////
// instance of the EventConnections class to manage event connections
EventConnections e_connections;

// define a particular connection ID to be used to unsubscribe later
EventConnectionId focusin_handler_id;

// subscribe to the FocusIn event with a lambda handler function and keeping connection ID
focusin_handler_id = publisher->getEventFocusIn().connect(e_connections, [](const Ptr<Widget> & widget) { 
		Log::message("\Handling FocusIn event (lambda).\n");
	}
);

// remove the subscription later using the ID
publisher->getEventFocusIn().disconnect(focusin_handler_id);


//////////////////////////////////////////////////////////////////////////////
//   5. Ignoring all FocusIn events when necessary
//////////////////////////////////////////////////////////////////////////////

// you can temporarily disable the event to perform certain actions without triggering it
publisher->getEventFocusIn().setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
publisher->getEventFocusIn().setEnabled(true);

Return value

Event reference.

Event<const Ptr<Widget> &> getEventHide() const#

event triggered when a widget is removed using Gui::removeChild(). Supported by all widgets. You can subscribe to events via connect() and unsubscribe via disconnect(). You can also use EventConnection and EventConnections classes for convenience (see examples below).

Notice

For more details see the Event Handling article.

The event handler signature is as follows: myhandler(const Ptr<Widget> & widget)

Usage Example

Source code (C++)

// implement the Hide event handler
void hide_event_handler(const Ptr<Widget> & widget)
{
	Log::message("\Handling Hide event\n");
}


//////////////////////////////////////////////////////////////////////////////
//  1. Multiple subscriptions can be linked to an instance of the EventConnections 
//  class that you can use later to remove all these subscriptions at once
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnections class
EventConnections hide_event_connections;

// link to this instance when subscribing to an event (subscription to various events can be linked)
publisher->getEventHide().connect(hide_event_connections, hide_event_handler);

// other subscriptions are also linked to this EventConnections instance 
// (e.g. you can subscribe using lambdas)
publisher->getEventHide().connect(hide_event_connections, [](const Ptr<Widget> & widget) { 
		Log::message("\Handling Hide event (lambda).\n");
	}
);

// ...

// later all of these linked subscriptions can be removed with a single line
hide_event_connections.disconnectAll();

//////////////////////////////////////////////////////////////////////////////
//  2. You can subscribe and unsubscribe via an instance of the EventConnection 
//  class. And toggle this particular connection off and on, when necessary.
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnection class
EventConnection hide_event_connection;

// subscribe to the Hide event with a handler function keeping the connection
publisher->getEventHide().connect(hide_event_connection, hide_event_handler);

// ...

// you can temporarily disable a particular event connection to perform certain actions
hide_event_connection.setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
hide_event_connection.setEnabled(true);

// ...

// remove subscription to the Hide event via the connection
hide_event_connection.disconnect();

//////////////////////////////////////////////////////////////////////////////
//  3. You can add EventConnection/EventConnections instance as a member of the
//  class that handles the event. In this case all linked subscriptions will be 
//  automatically removed when class destructor is called
//////////////////////////////////////////////////////////////////////////////

// Class handling the event
class SomeClass
{
public:
	// instance of the EventConnections class as a class member
	EventConnections e_connections;

	// A Hide event handler implemented as a class member
	void event_handler(const Ptr<Widget> & widget)
	{
		Log::message("\Handling Hide event\n");
		// ...
	}
};

SomeClass *sc = new SomeClass();

// ...

// specify a class instance in case a handler method belongs to some class
publisher->getEventHide().connect(sc->e_connections, sc, &SomeClass::event_handler);

// ...

// handler class instance is deleted with all its subscriptions removed automatically
delete sc;


//////////////////////////////////////////////////////////////////////////////
//   4. Subscribe to an event saving a particular connection ID
//   and unsubscribe later by this ID
//////////////////////////////////////////////////////////////////////////////
// instance of the EventConnections class to manage event connections
EventConnections e_connections;

// define a particular connection ID to be used to unsubscribe later
EventConnectionId hide_handler_id;

// subscribe to the Hide event with a lambda handler function and keeping connection ID
hide_handler_id = publisher->getEventHide().connect(e_connections, [](const Ptr<Widget> & widget) { 
		Log::message("\Handling Hide event (lambda).\n");
	}
);

// remove the subscription later using the ID
publisher->getEventHide().disconnect(hide_handler_id);


//////////////////////////////////////////////////////////////////////////////
//   5. Ignoring all Hide events when necessary
//////////////////////////////////////////////////////////////////////////////

// you can temporarily disable the event to perform certain actions without triggering it
publisher->getEventHide().setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
publisher->getEventHide().setEnabled(true);

Return value

Event reference.

Event<const Ptr<Widget> &> getEventShow() const#

event triggered when a widget is shown. Supported by all widgets. You can subscribe to events via connect() and unsubscribe via disconnect(). You can also use EventConnection and EventConnections classes for convenience (see examples below).

Notice

For more details see the Event Handling article.

The event handler signature is as follows: myhandler(const Ptr<Widget> & widget)

Usage Example

Source code (C++)

// implement the Show event handler
void show_event_handler(const Ptr<Widget> & widget)
{
	Log::message("\Handling Show event\n");
}


//////////////////////////////////////////////////////////////////////////////
//  1. Multiple subscriptions can be linked to an instance of the EventConnections 
//  class that you can use later to remove all these subscriptions at once
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnections class
EventConnections show_event_connections;

// link to this instance when subscribing to an event (subscription to various events can be linked)
publisher->getEventShow().connect(show_event_connections, show_event_handler);

// other subscriptions are also linked to this EventConnections instance 
// (e.g. you can subscribe using lambdas)
publisher->getEventShow().connect(show_event_connections, [](const Ptr<Widget> & widget) { 
		Log::message("\Handling Show event (lambda).\n");
	}
);

// ...

// later all of these linked subscriptions can be removed with a single line
show_event_connections.disconnectAll();

//////////////////////////////////////////////////////////////////////////////
//  2. You can subscribe and unsubscribe via an instance of the EventConnection 
//  class. And toggle this particular connection off and on, when necessary.
//////////////////////////////////////////////////////////////////////////////

// create an instance of the EventConnection class
EventConnection show_event_connection;

// subscribe to the Show event with a handler function keeping the connection
publisher->getEventShow().connect(show_event_connection, show_event_handler);

// ...

// you can temporarily disable a particular event connection to perform certain actions
show_event_connection.setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
show_event_connection.setEnabled(true);

// ...

// remove subscription to the Show event via the connection
show_event_connection.disconnect();

//////////////////////////////////////////////////////////////////////////////
//  3. You can add EventConnection/EventConnections instance as a member of the
//  class that handles the event. In this case all linked subscriptions will be 
//  automatically removed when class destructor is called
//////////////////////////////////////////////////////////////////////////////

// Class handling the event
class SomeClass
{
public:
	// instance of the EventConnections class as a class member
	EventConnections e_connections;

	// A Show event handler implemented as a class member
	void event_handler(const Ptr<Widget> & widget)
	{
		Log::message("\Handling Show event\n");
		// ...
	}
};

SomeClass *sc = new SomeClass();

// ...

// specify a class instance in case a handler method belongs to some class
publisher->getEventShow().connect(sc->e_connections, sc, &SomeClass::event_handler);

// ...

// handler class instance is deleted with all its subscriptions removed automatically
delete sc;


//////////////////////////////////////////////////////////////////////////////
//   4. Subscribe to an event saving a particular connection ID
//   and unsubscribe later by this ID
//////////////////////////////////////////////////////////////////////////////
// instance of the EventConnections class to manage event connections
EventConnections e_connections;

// define a particular connection ID to be used to unsubscribe later
EventConnectionId show_handler_id;

// subscribe to the Show event with a lambda handler function and keeping connection ID
show_handler_id = publisher->getEventShow().connect(e_connections, [](const Ptr<Widget> & widget) { 
		Log::message("\Handling Show event (lambda).\n");
	}
);

// remove the subscription later using the ID
publisher->getEventShow().disconnect(show_handler_id);


//////////////////////////////////////////////////////////////////////////////
//   5. Ignoring all Show events when necessary
//////////////////////////////////////////////////////////////////////////////

// you can temporarily disable the event to perform certain actions without triggering it
publisher->getEventShow().setEnabled(false);

// ... actions to be performed

// and enable it back when necessary
publisher->getEventShow().setEnabled(true);

Return value

Event reference.

Ptr<Widget> getChild ( int num ) const#

Returns a child widget with a given number.

Arguments

int num - Number of the child widget.

Return value

Pointer to the child widget.

int isChild ( const Ptr<Widget> & w ) const#

Checks if a given widget is a child of the current one.

Arguments

const Ptr<Widget> & w - Widget to check.

Return value

1 if the widget in question is a child; otherwise, 0.

void setFocus ( ) #

Sets focus on the widget.

int isFocused ( ) const#

Returns a value indicating if the widget is currently in focus.

Return value

1 if the widget is in focus; otherwise, 0.

void setFont ( const char * name ) #

Sets a true-type font (*.ttf) that will be used to render text on the widget by file path.

Arguments

const char * name - Path to the font file (*.ttf) stored in your project's data folder.

bool getIntersection ( int local_pos_x, int local_pos_y ) const#

Checks for an intersection with the widget's bounds for the given point.

Arguments

int local_pos_x - Local X coordinate.
int local_pos_y - Local Y coordinate.

Return value

true if the input coordinate is inside the widget; otherwise, false.

Ptr<Widget> getHierarchyIntersection ( int screen_pos_x, int screen_pos_y ) #

Checks for an intersection with a widget that belongs to the hierarchy of the current widget.

Arguments

int screen_pos_x - The X coordinate of the screen position.
int screen_pos_y - The Y coordinate of the screen position.

Return value

Widget the intersection with which is found.

int getKeyActivity ( unsigned int key ) const#

Checks if a given key already has a special purpose for the widget.

Arguments

unsigned int key - ASCII key code: one of the Input::KEY_*values.

Return value

1 if the key cannot be used; otherwise, 0.

void setPermanentFocus ( ) #

Sets permanent focus on the widget (it means that the widget is always in focus).

void setPosition ( int x, int y ) #

Sets a position of the widget relative to its parent.

Arguments

int x - X coordinate of the upper left corner of the widget.
int y - Y coordinate of the upper left corner of the widget.

void setToolTip ( const char * str, int reset = 0 ) #

Sets a tooltip for the widget.

Arguments

const char * str - Tooltip text.
int reset - 1 to recalculate a tooltip location if the mouse cursor was relocated; otherwise — 0(by default).

const char * getToolTip ( ) const#

Returns the widget's tooltip text.

Return value

Tooltip text.

void addAttach ( const Ptr<Widget> & w, const char * format = 0, int multiplier = 1, int flags = 0 ) #

Attaches a given widget to the current one. When applied to checkboxes, converts them into a group of radio buttons. A horizontal/vertical slider can be attached to a label or a text field. The text field can be attached to any of the sliders.

Arguments

const Ptr<Widget> & w - Widget to attach.
const char * format - Format string or values entered into the attached widget. If none specified, "%d" is implied. This is an optional parameter.
int multiplier - Multiplier value, which is used to scale values provided by the attached widget. This is an optional parameter.
int flags - Attachment flags: one of the Gui:: Enumeration with ATTACH_* prefixes. This is an optional parameter.

void addChild ( const Ptr<Widget> & w, int flags = 0 ) #

Adds a child to the widget.

Arguments

const Ptr<Widget> & w - Child widget.
int flags - Widget flags: one of the Gui:: Enumeration with ALIGN_* prefixes. This is an optional parameter.

void arrange ( ) #

Rearranges the widget and its children to lay them out neatly. This function forces to recalculate widget size and allows to get updated GUI layout data in the current frame. If this function is not called, widget modifications made in the current update() will be available only in the next frame (i.e. with one-frame lag), as GUI is calculated and rendered after the script update() function has been executed.

void raise ( const Ptr<Widget> & w ) #

Brings a given widget to the top.

Notice

Works only for widgets added to GUI via the Gui::addChild() function with the Gui::ALIGN_OVERLAP flag specified (should not be Gui::ALIGN_FIXED).

Arguments

const Ptr<Widget> & w - Widget to be brought up.

void removeAttach ( const Ptr<Widget> & w ) #

Detaches a given widget from the current one.

Arguments

const Ptr<Widget> & w - Widget to detach.

void removeChild ( const Ptr<Widget> & w ) #

Removes a child widget from the list of the widget's children.

Arguments

const Ptr<Widget> & w - Child widget smart pointer.

void removeFocus ( ) #

Removes focus from the widget.

void replaceChild ( const Ptr<Widget> & w, const Ptr<Widget> & old_w, int flags = 0 ) #

Replaces one child widget with another.

Arguments

const Ptr<Widget> & w - New child widget smart pointer.
const Ptr<Widget> & old_w - Widget to be replaced.
int flags - Widget flags: one of the Gui:: Enumeration with ALIGN_* prefixes. This is an optional parameter.

Widget::LIFETIME getLifetimeSelf ( ) const#

Returns the lifetime management type set for the widget.

NoticeLifetime of each widget in the hierarchy is defined by it's root. Setting lifetime management type for a child widget different from the one set for the root has no effect.

int toRenderSize ( int unit_size ) #

Transforms the unit value to the pixel value.

Arguments

int unit_size - Size in units.

Return value

Size in pixels.

int toUnitSize ( int render_size ) #

Transforms the pixel value to the unit value.

Arguments

int render_size - Size in pixels.

Return value

Size in units.

Math::ivec2 toRenderSize ( const Math::ivec2 & unit_size ) #

Transforms the unit value to the pixel value.

Arguments

const Math::ivec2 & unit_size - Size in units.

Return value

Size in pixels.

Math::ivec2 toUnitSize ( const Math::ivec2 & render_size ) #

Transforms the pixel value to the unit value.

Arguments

const Math::ivec2 & render_size - Size in pixels.

Return value

Size in units.

Math::ivec2 getTextRenderSize ( const char * OUT_text ) const#

Returns the size (in pixels) of the specified text string rendered on the screen with taking into account all text output settings such as dpi, font size and style.

Arguments

const char * OUT_text - Text string.
Notice
This output buffer is to be filled by the Engine as a result of executing the method.

Return value

Text size in pixels.

void runEventShow ( ) #

Emulates the Show event.

void runEventHide ( ) #

Emulates the Hide event.

void runEventFocusIn ( ) #

Emulates the FocusIn event.

void runEventFocusOut ( ) #

Emulates the FocusOut event.

void runEventChanged ( ) #

Emulates the Changed event.

void runEventClicked ( int mouse_buttons ) #

Emulates the Clicked event.

Arguments

int mouse_buttons - Mouse button - a mask representing a combination of the following flags: Gui.MOUSE_MASK_LEFT | Gui.MOUSE_MASK_MIDDLE | Gui.MOUSE_MASK_RIGHT.

void runEventDoubleClicked ( ) #

Emulates the DoubleClicked event.

void runEventPressed ( int mouse_buttons ) #

Emulates the Pressed event.

Arguments

int mouse_buttons - Mouse button - a mask representing a combination of the following flags: Gui.MOUSE_MASK_LEFT | Gui.MOUSE_MASK_MIDDLE | Gui.MOUSE_MASK_RIGHT.

void runEventReleased ( int mouse_buttons ) #

Emulates the Released event.

Arguments

int mouse_buttons - Mouse button - a mask representing a combination of the following flags: Gui.MOUSE_MASK_LEFT | Gui.MOUSE_MASK_MIDDLE | Gui.MOUSE_MASK_RIGHT.

void runEventKeyPressed ( int key ) #

Emulates the KeyPressed event.

Arguments

int key - Key scan code.

void runEventTextPressed ( unsigned int code ) #

Emulates the TextPressed event.

Arguments

unsigned int code - Vistual key.

void runEventEnter ( ) #

Emulates the Enter event.

void runEventLeave ( ) #

Emulates the Leave event.

void runEventDragMove ( const Ptr<Widget> & pointer ) #

Emulates the DragMove event.

Arguments

const Ptr<Widget> & pointer - Underlying widget.

void runEventDragDrop ( const Ptr<Widget> & pointer ) #

Emulates the DragDrop event.

Arguments

const Ptr<Widget> & pointer - Target widget.

Last update: 2024-12-13

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Unigine::Widget Class

In This Article:

Working with Widgets#

Lifetime of Widgets#

Managing Lifetime by the World#

Managing Lifetime by the Window#

Managing Lifetime by the Engine#

See Also#

功能列表:

Widget Class

枚举

TYPE#

LIFETIME#

Members

int getNumChildren() const#

Return value

void setFontWrap ( int wrap ) #

Arguments

int getFontWrap() const#

Return value

void setFontRich ( int rich ) #

Arguments

int getFontRich() const#

Return value

void setFontOutline ( int outline ) #

Arguments

int getFontOutline() const#

Return value

void setFontVOffset ( int voffset ) #

Arguments

int getFontVOffset() const#

Return value

void setFontHOffset ( int hoffset ) #

Arguments

int getFontHOffset() const#

Return value

void setFontVSpacing ( int vspacing ) #

Arguments

int getFontVSpacing() const#

Return value

void setFontHSpacing ( int hspacing ) #

Arguments

int getFontHSpacing() const#

Return value

void setFontPermanent ( int permanent ) #

Arguments

int getFontPermanent() const#

Return value

void setFontColor ( const Math::vec4& color ) #

Arguments

Math::vec4 getFontColor() const#

Return value

void setFontSize ( int size ) #

Arguments

int getFontSize() const#

Return value

void setMouseCursor ( int cursor ) #

Arguments

int getMouseCursor() const#

Return value

int getMouseY() const#

Return value

int getMouseX() const#

Return value

void setHeight ( int height ) #

Arguments

int getHeight() const#

Return value

void setWidth ( int width ) #

Arguments

int getWidth() const#

Return value

int getScreenPositionY() const#

Return value

int getScreenPositionX() const#

Return value

void setPositionY ( int y ) #

Arguments

int getPositionY() const#

Return value