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Telegram/lib_ui/ui/effects/path_shift_gradient.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 <QtGui/QLinearGradient>
+
+namespace Ui {
+
+class PathShiftGradient final {
+public:
+	PathShiftGradient(
+		const style::color &bg,
+		const style::color &fg,
+		Fn<void()> animationCallback,
+		rpl::producer<> paletteUpdated = nullptr);
+	~PathShiftGradient();
+
+	void startFrame(
+		int viewportLeft,
+		int viewportWidth,
+		int gradientWidth);
+
+	void overrideColors(const style::color &bg, const style::color &fg);
+	void clearOverridenColors();
+
+	using Background = std::variant<QLinearGradient*, style::color>;
+	bool paint(Fn<bool(const Background&)> painter);
+
+private:
+	struct AnimationData;
+
+	void refreshColors();
+	void refreshColors(const style::color &bg, const style::color &fg);
+	void updateGeometry();
+	void activateAnimation();
+
+	static std::weak_ptr<AnimationData> Animation;
+
+	const style::color &_bg;
+	const style::color &_fg;
+	const style::color *_bgOverride = nullptr;
+	QLinearGradient _gradient;
+	std::shared_ptr<AnimationData> _animation;
+	const Fn<void()> _animationCallback;
+	int _viewportLeft = 0;
+	int _viewportWidth = 0;
+	int _gradientWidth = 0;
+	int _gradientStart = 0;
+	int _gradientFinalStop = 0;
+	bool _gradientEnabled = false;
+	bool _geometryUpdated = false;
+	bool _animationActive = false;
+	bool _colorsOverriden = false;
+
+	rpl::lifetime _lifetime;
+
+};
+
+} // namespace Ui