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Telegram/lib_ui/ui/paint/arcs.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 "styles/style_widgets.h"
+
+class Painter;
+
+namespace Ui::Paint {
+
+class ArcsAnimation {
+public:
+
+	enum class Direction {
+		Up,
+		Down,
+		Left,
+		Right,
+	};
+
+	ArcsAnimation(
+		const style::ArcsAnimation &st,
+		std::vector<float> thresholds,
+		float64 startValue,
+		Direction direction);
+
+	void paint(
+		QPainter &p,
+		std::optional<QColor> colorOverride = std::nullopt);
+
+	void setValue(float64 value);
+
+	rpl::producer<> startUpdateRequests();
+	rpl::producer<> stopUpdateRequests();
+
+	void update(crl::time now);
+
+	bool isFinished() const;
+
+	float width() const;
+	float maxWidth() const;
+	float finishedWidth() const;
+	float height() const;
+
+	void setStrokeRatio(float ratio);
+
+private:
+	struct Arc {
+		QRectF rect;
+		float threshold;
+		crl::time startTime = 0;
+		float64 progress = 0.;
+	};
+
+	void initArcs(std::vector<float> thresholds);
+	QRectF computeArcRect(int index) const;
+	bool isHorizontal() const;
+
+	bool isArcFinished(const Arc &arc) const;
+	void updateArcStartTime(
+		Arc &arc,
+		float64 previousValue,
+		crl::time now);
+
+	const style::ArcsAnimation &_st;
+	const Direction _direction;
+	const int _startAngle;
+	const int _spanAngle;
+	const QRectF _emptyRect;
+
+	float64 _currentValue = 0.;
+	float _strokeRatio = 0.;
+
+	rpl::event_stream<> _startUpdateRequests;
+	rpl::event_stream<> _stopUpdateRequests;
+
+	std::vector<Arc> _arcs;
+
+};
+
+} // namespace Ui::Paint