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Telegram/lib_ui/ui/animated_icon.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/style/style_core_types.h"
+#include "ui/effects/animations.h"
+#include "base/weak_ptr.h"
+
+#include <crl/crl_time.h>
+#include <QtCore/QByteArray>
+#include <optional>
+
+namespace Ui {
+
+class FrameGenerator;
+
+struct AnimatedIconDescriptor {
+	FnMut<std::unique_ptr<FrameGenerator>()> generator;
+	QSize sizeOverride;
+	bool colorized = false;
+};
+
+class AnimatedIcon final : public base::has_weak_ptr {
+public:
+	explicit AnimatedIcon(AnimatedIconDescriptor &&descriptor);
+	AnimatedIcon(const AnimatedIcon &other) = delete;
+	AnimatedIcon &operator=(const AnimatedIcon &other) = delete;
+	AnimatedIcon(AnimatedIcon &&other) = delete; // _animation captures this.
+	AnimatedIcon &operator=(AnimatedIcon &&other) = delete;
+
+	[[nodiscard]] bool valid() const;
+	[[nodiscard]] int frameIndex() const;
+	[[nodiscard]] int framesCount() const;
+	[[nodiscard]] double frameRate() const;
+	[[nodiscard]] QImage frame(const QColor &textColor) const;
+	[[nodiscard]] QImage notColorizedFrame() const;
+	[[nodiscard]] int width() const;
+	[[nodiscard]] int height() const;
+	[[nodiscard]] QSize size() const;
+
+	struct ResizedFrame {
+		QImage image;
+		bool scaled = false;
+	};
+	[[nodiscard]] ResizedFrame frame(
+		const QColor &textColor,
+		QSize desiredSize,
+		Fn<void()> updateWithPerfect) const;
+	[[nodiscard]] ResizedFrame notColorizedFrame(
+		QSize desiredSize,
+		Fn<void()> updateWithPerfect) const;
+
+	void animate(Fn<void()> update);
+	void jumpToStart(Fn<void()> update);
+	void setCustomEndFrame(int frame);
+	void setCustomStartFrame(int frame);
+
+	void paint(QPainter &p, int x, int y);
+	void paintInCenter(QPainter &p, QRect rect);
+
+	[[nodiscard]] bool animating() const;
+
+private:
+	struct Frame;
+	class Impl;
+	friend class Impl;
+
+	void wait() const;
+	[[nodiscard]] int wantedFrameIndex(
+		crl::time now,
+		const Frame *resolvedCurrent = nullptr) const;
+	void preloadNextFrame(
+		crl::time now,
+		const Frame *resolvedCurrent = nullptr,
+		QSize updatedDesiredSize = QSize()) const;
+	void frameJumpFinished();
+	void continueAnimation(crl::time now);
+	[[nodiscard]] int effectiveFramesCount() const;
+
+	std::shared_ptr<Impl> _impl;
+	crl::time _animationStartTime = 0;
+	crl::time _animationStarted = 0;
+	mutable Animations::Simple _animation;
+	mutable Fn<void()> _repaint;
+	mutable crl::time _animationDuration = 0;
+	mutable crl::time _animationCurrentStart = 0;
+	mutable crl::time _animationNextStart = 0;
+	mutable int _animationCurrentIndex = 0;
+	bool _colorized = false;
+	int _customEndFrame = -1;
+	int _customStartFrame = -1;
+
+};
+
+[[nodiscard]] std::unique_ptr<AnimatedIcon> MakeAnimatedIcon(
+	AnimatedIconDescriptor &&descriptor);
+
+} // namespace Ui