init

Telegram/lib_ui/ui/effects/radial_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/effects/animations.h"
+
+namespace style {
+struct InfiniteRadialAnimation;
+} // namespace style
+
+namespace Ui {
+
+struct RadialState {
+	static const int kFull;
+
+	float64 shown = 0.;
+	int arcFrom = 0;
+	int arcLength = kFull;
+};
+
+class RadialAnimation {
+public:
+	template <typename Callback>
+	RadialAnimation(Callback &&callback);
+
+	[[nodiscard]] float64 opacity() const {
+		return _opacity;
+	}
+	[[nodiscard]] bool animating() const {
+		return _animation.animating();
+	}
+
+	void start(float64 prg);
+	bool update(float64 prg, bool finished, crl::time ms);
+	void stop();
+
+	void draw(
+		QPainter &p,
+		const QRectF &inner,
+		float64 thickness,
+		style::color color) const;
+
+	[[nodiscard]] RadialState computeState() const;
+
+private:
+	crl::time _firstStart = 0;
+	crl::time _lastStart = 0;
+	crl::time _lastTime = 0;
+	float64 _opacity = 0.;
+	anim::value _arcEnd;
+	anim::value _arcStart;
+	Ui::Animations::Basic _animation;
+	bool _finished = false;
+
+};
+
+template <typename Callback>
+inline RadialAnimation::RadialAnimation(Callback &&callback)
+: _arcStart(0, RadialState::kFull)
+, _animation(std::forward<Callback>(callback)) {
+}
+
+
+class InfiniteRadialAnimation {
+public:
+	template <typename Callback>
+	InfiniteRadialAnimation(
+		Callback &&callback,
+		const style::InfiniteRadialAnimation &st);
+
+	[[nodiscard]] bool animating() const {
+		return _workStarted && (!_workFinished || _workFinished > crl::now());
+	}
+
+	void start(crl::time skip = 0);
+	void stop(anim::type animated = anim::type::normal);
+
+	void draw(
+		QPainter &p,
+		QPoint position,
+		int outerWidth);
+	void draw(
+		QPainter &p,
+		QPoint position,
+		QSize size,
+		int outerWidth);
+
+	static void Draw(
+		QPainter &p,
+		const RadialState &state,
+		QPoint position,
+		QSize size,
+		int outerWidth,
+		QPen pen,
+		int thickness);
+
+	[[nodiscard]] RadialState computeState();
+
+private:
+	void init();
+
+	const style::InfiniteRadialAnimation &_st;
+	crl::time _workStarted = 0;
+	crl::time _workFinished = 0;
+	Ui::Animations::Basic _animation;
+	rpl::lifetime _lifetime;
+
+};
+
+template <typename Callback>
+inline InfiniteRadialAnimation::InfiniteRadialAnimation(
+	Callback &&callback,
+	const style::InfiniteRadialAnimation &st)
+: _st(st)
+, _animation(std::forward<Callback>(callback)) {
+	init();
+}
+
+} // namespace Ui