Unigine::WidgetDialogFile Class

class AppWorldLogic : public Unigine::WorldLogic
{

	// ... //

private:
	// declaring widgets to be used and callback functions for them
	Unigine::WidgetLabelPtr file_name;
	Unigine::WidgetButtonPtr open_button;
	Unigine::WidgetDialogFilePtr file_dialog;
	void on_button_clicked(const Unigine::WidgetPtr & widget,  int mouse_buttons);
	void dialog_ok_clicked();
	void dialog_cancel_clicked();

	Unigine::EventConnections connection;
};

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

using namespace Unigine;

// callback to be fired on clicking the button displaying the file dialog
void AppWorldLogic::on_button_clicked(const WidgetPtr & widget, int mouse_buttons)
{
	// resetting file selection, showing the dialog and setting permanent focus to it
	file_dialog->setFile("");
	file_dialog->setHidden(0);
	file_dialog->setPermanentFocus();
}

// callback to be fired on clicking the Ok button of the file dialog
void AppWorldLogic::dialog_ok_clicked()
{
	// getting the current path selection fron the dialog and checking if the file exists
	String path = file_dialog->getFile();
	if (!FileSystem::isFileExist(path))
		return;

	// if the file exists hiding the dialog, displaying the selected file on the "file_name" label and removing focus
	file_dialog->setHidden(1);
	file_name->setText(path);
	file_dialog->removeFocus();
}

// callback to be fired on clicking the Cancel button of the file dialog
void AppWorldLogic::dialog_cancel_clicked()
{
	file_dialog->setHidden(1);
	file_dialog->removeFocus();
}

int AppWorldLogic::init()
{
	// getting a pointer to the system GUI
	GuiPtr gui = Gui::getCurrent();

	// creating a label widget to display the file selected via the dialog
	file_name = WidgetLabel::create(gui, "No file selected yet");
	gui->addChild(file_name, Gui::ALIGN_TOP | Gui::ALIGN_BACKGROUND);

	// creating a button widget to display the file dialog
	open_button = WidgetButton::create(gui, "Select an image file on disk");
	gui->addChild(open_button, Gui::ALIGN_TOP | Gui::ALIGN_BACKGROUND);

	
	// setting "on_button_clicked" function to handle CLICKED event for the button
	open_button->getEventClicked().connect(connection, this, &AppWorldLogic::on_button_clicked);

	// creating a file dialog widget and setting its caption, default path and file extensions filter to display only *.png and *.jpeg files
	file_dialog = WidgetDialogFile::create(gui, "File open dialog");
	file_dialog->setPath("./");
	file_dialog->setFilter(".png.jpeg");

	// setting "dialog_ok_clicked" function to handle CLICKED event for dialog Ok button
	file_dialog->getOkButton()->getEventClicked().connect(connection, this, &AppWorldLogic::dialog_ok_clicked);

	// setting "dialog_cancel_clicked" function to handle CLICKED event for dialog Cancel button
	file_dialog->getCancelButton()->getEventClicked().connect(connection, this, &AppWorldLogic::dialog_cancel_clicked);

	// adding the created file dialog widget to the system GUI and hiding it
	file_dialog->setHidden(1);
	gui->addChild(file_dialog, Gui::ALIGN_OVERLAP | Gui::ALIGN_CENTER);

	return 1;
}