tg_windows5.12.6/Telegram/lib_ui/ui/effects/fade_animation.h

// This file is part of Desktop App Toolkit,
// a set of libraries for developing nice desktop applications.
//
// For license and copyright information please follow this link:
// https://github.com/desktop-app/legal/blob/master/LEGAL
//
#pragma once

#include "ui/rp_widget.h"
#include "ui/effects/animations.h"
#include "styles/style_widgets.h"

namespace Ui {

class FadeAnimation {
public:
	FadeAnimation(TWidget *widget, float64 scale = 1.);

	bool paint(QPainter &p);
	void refreshCache();

	using FinishedCallback = Fn<void()>;
	void setFinishedCallback(FinishedCallback &&callback);

	using UpdatedCallback = Fn<void(float64)>;
	void setUpdatedCallback(UpdatedCallback &&callback);

	void show();
	void hide();

	void fadeIn(int duration);
	void fadeOut(int duration);

	void finish() {
		stopAnimation();
	}

	bool animating() const {
		return _animation.animating();
	}
	bool visible() const {
		return _visible;
	}

private:
	void startAnimation(int duration);
	void stopAnimation();

	void updateCallback();
	QPixmap grabContent();

	TWidget *_widget = nullptr;
	float64 _scale = 1.;

	Ui::Animations::Simple _animation;
	QSize _size;
	QPixmap _cache;
	bool _visible = false;

	FinishedCallback _finishedCallback;
	UpdatedCallback _updatedCallback;

};

} // namespace Ui