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Telegram/lib_ui/ui/effects/fade_animation.h

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+// 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(RpWidget *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();
+
+	RpWidget *_widget = nullptr;
+	float64 _scale = 1.;
+
+	Ui::Animations::Simple _animation;
+	QSize _size;
+	QPixmap _cache;
+	bool _visible = false;
+
+	FinishedCallback _finishedCallback;
+	UpdatedCallback _updatedCallback;
+
+};
+
+} // namespace Ui