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Telegram/SourceFiles/ui/effects/snowflakes.h

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+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#pragma once
+
+#include "ui/effects/animations.h"
+
+namespace Ui {
+
+class Snowflakes final {
+public:
+	Snowflakes(Fn<void(const QRect &r)> updateCallback);
+
+	void paint(QPainter &p, const QRectF &rect);
+	void setPaused(bool paused);
+	void setBrush(QBrush brush);
+
+private:
+	enum class Type {
+		Dot,
+		Snowflake,
+	};
+
+	struct Interval {
+		int from = 0;
+		int length = 0;
+	};
+
+	struct Particle {
+		crl::time birthTime = 0;
+		crl::time deathTime = 0;
+		float64 scale = 0.;
+		float64 alpha = 0.;
+		float64 relativeX = 0.; // Relative to a width.
+		float64 relativeY = 0.; // Relative to a height.
+		float64 velocityX = 0.;
+		float64 velocityY = 0.;
+		Type type;
+	};
+
+	void createParticle(crl::time now);
+	[[nodiscard]] crl::time timeNow() const;
+	[[nodiscard]] int randomInterval(
+		const Interval &interval,
+		const gsl::byte &random) const;
+
+	const Interval _lifeLength;
+	const Interval _deathTime;
+	const Interval _scale;
+	const Interval _velocity;
+	const Interval _angle;
+	const Interval _relativeX;
+	const Interval _relativeY;
+
+	const float64 _appearProgressTill;
+	const float64 _disappearProgressAfter;
+	const QMarginsF _dotMargins;
+	const QMargins _renderMargins;
+
+	Ui::Animations::Basic _animation;
+	QImage _sprite;
+
+	std::vector<Particle> _particles;
+
+	crl::time _nextBirthTime = 0;
+	struct {
+		crl::time diff = 0;
+		crl::time at = 0;
+	} _paused;
+	QBrush _brush;
+
+	QRect _rectToUpdate;
+
+};
+
+} // namespace Ui