Unigine::UserInterface Class
| Header: | #include <UnigineUserInterface.h> |
The class is used to work with widgets that are created by loading a UI file.
Usage Examples#
The examples below show:
- Loading a UserInterface from the *.ui file and accessing the widgets it stores.
- Adding callbacks to these widgets.
- Managing the UserInterface lifetime.
Managing Lifetime by the World#
The UserInterface is created on loading the world. When you reload or exit the world, or close the Engine window, the UserInterface is deleted.
AppWorldLogic.cpp
Source code (C++)
#include "AppWorldLogic.h"
#include <UnigineWidgets.h>
#include <UnigineUserInterface.h>
using namespace Unigine;
// EventConnections class instance to manage event subscriptions
EventConnections econn;
void on_group_remove(const WidgetPtr &group)
{
Log::message("world group removed\n");
}
int AppWorldLogic::init()
{
// world user interface
UserInterfacePtr ui = UserInterface::create(Gui::getCurrent(), "user_interface.ui");
ui->setLifetime(Widget::LIFETIME_WORLD);
auto main_group = checked_ptr_cast<WidgetGroupBox>(ui->getWidget(ui->findWidget("main_group")));
main_group->setText("World User Interface");
main_group->getEventRemove().connect(econn, on_group_remove);
WindowManager::getMainWindow()->addChild(main_group, Gui::ALIGN_EXPAND);
return 1;
}
int AppWorldLogic::shutdown()
{
// removing all event subscriptions
econn.disconnectAll();
return 1;
}Managing Lifetime by the Window#
The UserInterface is created in a separate window. When you close the window, the UserInterface is deleted as its lifetime is managed by this window. The console shows whether the window and UserInterface are deleted or not, whether the remove event is fired, and the message from the remove event handler (if it is).
After closing, the window can be re-created by pressing T.
AppSystemLogic.cpp
Source code (C++)
#include "AppSystemLogic.h"
#include <UnigineWidgets.h>
#include <UnigineUserInterface.h>
using namespace Unigine;
// EventConnections class instance to manage event subscriptions
EventConnections econnections;
EngineWindowViewportPtr window;
UserInterfacePtr ui;
WidgetGroupBoxPtr main_group;
bool group_remove_handler = false;
void on_window_group_remove()
{
Log::message("window group removed\n");
group_remove_handler = true;
}
void create_window()
{
window = EngineWindowViewport::create("Test", 512, 256, EngineWindow::FLAGS_SHOWN);
// window user interface
ui = UserInterface::create(window->getGui(), "user_interface.ui");
ui->setLifetime(Widget::LIFETIME_WINDOW);
main_group = checked_ptr_cast<WidgetGroupBox>(ui->getWidget(engine_ui->findWidget("main_group")));
main_group->setText("Window User Interface");
main_group->getEventRemove().connect(econnections, on_window_group_remove);
window->addChild(main_group, Gui::ALIGN_EXPAND);
}
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, group deleted: %d, ui deleted: %d, group remove handler %d\n",
window.isDeleted(), main_group.isDeleted(), ui.isDeleted(), group_remove_handler);
return 1;
}
int AppSystemLogic::shutdown()
{
// removing all event subscriptions
econnections.disconnectAll();
return 1;
}Managing Lifetime by the Engine#
The lifetime of the UserInterface is managed by the Engine, so it is deleted on Engine shutdown. A Gui instance is set manually via the setGui() method.
The console shows whether the window and UserInterface are deleted or not, whether the remove event is fired, and the message from the remove event handler (if it is). After closing, the window can be re-created by pressing T.
AppSystemLogic.cpp
Source code (C++)
#include "AppSystemLogic.h"
#include <UnigineWidgets.h>
#include <UnigineUserInterface.h>
using namespace Unigine;
// EventConnections class instance to manage event subscriptions
EventConnections econnections;
EngineWindowViewportPtr engine_window;
UserInterfacePtr engine_ui;
WidgetGroupBoxPtr engine_main_group;
bool engine_group_remove_handler = false;
void on_engine_group_remove(const WidgetPtr &group)
{
Log::message("engine group removed\n");
engine_group_remove_handler = true;
}
void create_engine_window()
{
engine_window = EngineWindowViewport::create("Test", 512, 256, EngineWindow::FLAGS_SHOWN);
engine_ui->setGui(engine_window->getGui());
engine_window->addChild(engine_main_group, Gui::ALIGN_EXPAND);
}
int AppSystemLogic::init()
{
// engine user interface
engine_ui = UserInterface::create(Gui::getCurrent(), "user_interface.ui");
engine_ui->setLifetime(Widget::LIFETIME_ENGINE);
engine_main_group = checked_ptr_cast<WidgetGroupBox>(engine_ui->getWidget(ui->findWidget("main_group")));
engine_main_group->setText("Engine User Interface");
engine_main_group->getEventRemove().connect(econnections, on_engine_group_remove);
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 group deleted: %d, engine ui deleted: %d, engine group remove handler %d\n",
engine_window.isDeleted(), engine_main_group.isDeleted(), engine_ui.isDeleted(), engine_group_remove_handler);
return 1;
}
int AppSystemLogic::shutdown()
{
// removing all event subscriptions
econnections.disconnectAll();
return 1;
}See Also#
- C++ API sample <UnigineSDK>/source/samples/Api/Widgets/UserInterface
- C# API sample <UnigineSDK>/source/csharp/samples/Api/Widgets/UserInterface
UserInterface Class
Enums
EVENT_TYPE#
Members
static UserInterfacePtr create ( const Ptr<Gui> & gui, const char * name, const char * prefix = 0 ) #
UserInterface constructor.Arguments
- const Ptr<Gui> & gui - GUI smart pointer.
- const char * name - User interface name.
- const char * prefix - Names prefix.
int getCallback ( int num, int callback ) const#
Returns the number of a given callback function.Arguments
- int num - Widget number.
- int callback - Callback type number. One of the callbacks defined in the Gui class (for example, CLICK, SHOW, HIDE, etc).
Return value
Callback number.const char * getCallbackInstanceData ( int num, Gui::CALLBACK_INDEX callback ) const#
Returns the callback instance data.Arguments
- int num - Widget number.
- Gui::CALLBACK_INDEX callback - Callback type number. One of the callbacks defined in the Gui class (for example, CLICK, SHOW, HIDE, etc).
Return value
Callback instance data.const char * getCallbackName ( int num, Gui::CALLBACK_INDEX callback ) const#
Returns the name of a given callback function.Arguments
- int num - Widget number.
- Gui::CALLBACK_INDEX callback - Callback type number. One of the callbacks defined in the Gui class (for example, CLICK, SHOW, HIDE, etc).
Return value
Callback function name.const char * getCallbackStringData ( int num, Gui::CALLBACK_INDEX callback ) const#
Returns the callback string data.Arguments
- int num - Widget number.
- Gui::CALLBACK_INDEX callback - Callback type number. One of the callbacks defined in the Gui class (for example, CLICK, SHOW, HIDE, etc).
Return value
Callback string data.const char * getCallbackVariableData ( int num, Gui::CALLBACK_INDEX callback ) const#
Returns the callback variable data.Arguments
- int num - Widget number.
- Gui::CALLBACK_INDEX callback - Callback type number. One of the callbacks defined in the Gui class (for example, CLICK, SHOW, HIDE, etc).
Return value
Callback variable data.Ptr<Widget> getCallbackWidgetData ( int num, Gui::CALLBACK_INDEX callback ) const#
Returns the callback widget data.Arguments
- int num - Widget number.
- Gui::CALLBACK_INDEX callback - Callback type number. One of the callbacks defined in the Gui class (for example, CLICK, SHOW, HIDE, etc).
Return value
Widget data.int getNumCallbacks ( int num ) const#
Returns the total number of callbacks for a given widget.Arguments
- int num - Widget number.
Return value
Number of callbacks.int getNumWidgets ( ) const#
Returns the number of associated widgets.Return value
Number of associated widgets.Ptr<Widget> getWidget ( int num ) const#
Returns a widget with the given ID.Arguments
- int num - Widget number.
Return value
Pointer to the widget with the given number.Ptr<Widget> getWidgetByName ( const char * name ) const#
Returns a widget with the given name.Arguments
- const char * name - Widget name.
Return value
Widget with the given ID.int getWidgetExport ( int num ) const#
Returns a value indicating if a given widget is exported into a script.Arguments
- int num - Widget number.
Return value
Returns 1 if the widget is exported; otherwise, 0.const char * getWidgetName ( int num ) const#
Returns widget name by its number.Arguments
- int num - Widget number.
Return value
Widget name.const char * getWidgetNext ( int num ) const#
Returns the name of the widget, which will be focused next.Arguments
- int num - Current widget number.
Return value
Next Widget name.int findWidget ( const char * name ) const#
Searches a widget by its name.Arguments
- const char * name - Widget name.
Return value
Returns the number of the widget if exists; otherwise, -1.void updateWidgets ( ) const#
Updates all widgets belonging to the user interface. This function should be called, for example, after change of the interface language.void setGui ( const Ptr<Gui> & gui ) #
Sets a new Gui instance to be used for the UserInterface.Arguments
Ptr<Gui> getGui ( ) const#
Returns a Gui instance for the UserInterface.Return value
Gui instance currently used for the UserInterface.void setLifetime ( Widget::LIFETIME lifetime ) #
Sets the lifetime management type for the UserInterface. By default, the LIFETIME_ENGINE type is used.Arguments
- Widget::LIFETIME lifetime
Widget::LIFETIME getLifetime ( ) const#
Returns the lifetime management type for the root of the UserInterface, or for the UserInterface itself (if it is not a child for another UserInterface).Notice
Lifetime of each UserInterface in the hierarchy is defined by it's root. Thus, lifetime management type set for a child UserInterface that differs from the one set for the root is ignored.
Last update:
2024-08-01
Help improve this article
Was this article helpful?
(or select a word/phrase and press Ctrl+Enter)