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Telegram/lib_ui/ui/effects/slide_animation.cpp

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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
+//
+#include "ui/effects/slide_animation.h"
+
+#include <QtGui/QPainter>
+
+namespace Ui {
+
+void SlideAnimation::setSnapshots(
+		QPixmap leftSnapshot,
+		QPixmap rightSnapshot) {
+	Expects(!leftSnapshot.isNull());
+	Expects(!rightSnapshot.isNull());
+
+	_leftSnapshot = std::move(leftSnapshot);
+	_rightSnapshot = std::move(rightSnapshot);
+	_leftSnapshot.setDevicePixelRatio(style::DevicePixelRatio());
+	_rightSnapshot.setDevicePixelRatio(style::DevicePixelRatio());
+}
+
+void SlideAnimation::paintFrame(QPainter &p, int x, int y, int outerWidth) {
+	if (!animating()) {
+		return;
+	}
+
+	const auto pixelRatio = style::DevicePixelRatio();
+	const auto state = this->state();
+	const auto leftCoord = _slideLeft
+		? anim::interpolate(-_leftSnapshotWidth, 0, state.leftProgress)
+		: anim::interpolate(0, -_leftSnapshotWidth, state.leftProgress);
+	const auto rightCoord = _slideLeft
+		? anim::interpolate(0, _rightSnapshotWidth, state.rightProgress)
+		: anim::interpolate(_rightSnapshotWidth, 0, state.rightProgress);
+
+	if (_overflowHidden) {
+		const auto leftWidth = (_leftSnapshotWidth + leftCoord);
+		if (leftWidth > 0) {
+			p.setOpacity(state.leftAlpha);
+			p.drawPixmap(
+				x,
+				y,
+				leftWidth,
+				_leftSnapshotHeight,
+				_leftSnapshot,
+				(_leftSnapshot.width() - leftWidth * pixelRatio),
+				0,
+				leftWidth * pixelRatio,
+				_leftSnapshot.height());
+		}
+		const auto rightWidth = _rightSnapshotWidth - rightCoord;
+		if (rightWidth > 0) {
+			p.setOpacity(state.rightAlpha);
+			p.drawPixmap(
+				x + rightCoord,
+				y,
+				_rightSnapshot,
+				0,
+				0,
+				rightWidth * pixelRatio,
+				_rightSnapshot.height());
+		}
+	} else {
+		p.setOpacity(state.leftAlpha);
+		p.drawPixmap(x + leftCoord, y, _leftSnapshot);
+		p.setOpacity(state.rightAlpha);
+		p.drawPixmap(x + rightCoord, y, _rightSnapshot);
+	}
+}
+
+SlideAnimation::State SlideAnimation::state() const {
+	const auto dt = _animation.value(1.);
+	const auto easeOut = anim::easeOutCirc(1., dt);
+	const auto easeIn = anim::easeInCirc(1., dt);
+	const auto arrivingAlpha = easeIn;
+	const auto departingAlpha = 1. - easeOut;
+
+	auto result = State();
+	result.leftProgress = _slideLeft ? easeOut : easeIn;
+	result.leftAlpha = _slideLeft ? arrivingAlpha : departingAlpha;
+	result.rightProgress = _slideLeft ? easeIn : easeOut;
+	result.rightAlpha = _slideLeft ? departingAlpha : arrivingAlpha;
+	return result;
+}
+
+} // namespace Ui