Unigine::WidgetDialogFile Class

#ifndef __APP_WORLD_LOGIC_H__
#define __APP_WORLD_LOGIC_H__

#include <UnigineLogic.h>
#include <UnigineStreams.h>
#include <UnigineWidgets.h>

class AppWorldLogic : public Unigine::WorldLogic
{

public:
	AppWorldLogic();
	virtual ~AppWorldLogic();

	int init() override;

	int update() override;
	int postUpdate() override;
	int updatePhysics() override;

	int shutdown() override;

	int save(const Unigine::StreamPtr &stream) override;
	int restore(const Unigine::StreamPtr &stream) override;
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();
	void dialog_ok_clicked();
	void dialog_cancel_clicked();
};

#endif // __APP_WORLD_LOGIC_H__

#include <UnigineWidgets.h>
#include <UnigineFileSystem.h>
#include "AppWorldLogic.h"
using namespace Unigine;

// callback to be fired on clicking the button displaying the file dialog
void AppWorldLogic::on_button_clicked()
{
	// resetting file sepection, 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();
}
AppWorldLogic::AppWorldLogic()
{
}

AppWorldLogic::~AppWorldLogic()
{
}

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->addCallback(Gui::CLICKED, MakeCallback(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()->addCallback(Gui::CLICKED, MakeCallback(this, &AppWorldLogic::dialog_ok_clicked));

	// setting "dialog_cancel_clicked" function to handle CLICKED event for dialog Cancel button
	file_dialog->getCancelButton()->addCallback(Gui::CLICKED, MakeCallback(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;
}

////////////////////////////////////////////////////////////////////////////////
// start of the main loop
////////////////////////////////////////////////////////////////////////////////

int AppWorldLogic::update()
{
	// Write here code to be called before updating each render frame: specify all graphics-related functions you want to be called every frame while your application executes.
	return 1;
}

int AppWorldLogic::postUpdate()
{
	// The engine calls this function after updating each render frame: correct behavior after the state of the node has been updated.
	return 1;
}

int AppWorldLogic::updatePhysics()
{
	// Write here code to be called before updating each physics frame: control physics in your application and put non-rendering calculations.
	// The engine calls updatePhysics() with the fixed rate (60 times per second by default) regardless of the FPS value.
	// WARNING: do not create, delete or change transformations of nodes here, because rendering is already in progress.
	return 1;
}

////////////////////////////////////////////////////////////////////////////////
// end of the main loop
////////////////////////////////////////////////////////////////////////////////

int AppWorldLogic::shutdown()
{
	// Write here code to be called on world shutdown: delete resources that were created during world script execution to avoid memory leaks.

	return 1;
}

int AppWorldLogic::save(const Unigine::StreamPtr &stream)
{
	// Write here code to be called when the world is saving its state (i.e. state_save is called): save custom user data to a file.
	UNIGINE_UNUSED(stream);
	return 1;
}

int AppWorldLogic::restore(const Unigine::StreamPtr &stream)
{
	// Write here code to be called when the world is restoring its state (i.e. state_restore is called): restore custom user data to a file here.
	UNIGINE_UNUSED(stream);
	return 1;
}