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Telegram/SourceFiles/ui/effects/glare.cpp

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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
+*/
+#include "ui/effects/glare.h"
+
+#include "styles/style_boxes.h"
+
+namespace Ui {
+namespace {
+
+constexpr auto kMaxGlareOpaque = 0.5;
+
+} // namespace
+
+float64 GlareEffect::progress(crl::time now) const {
+	return (now - glare.birthTime)
+		/ float64(glare.deathTime - glare.birthTime);
+}
+
+QLinearGradient GlareEffect::computeGradient(const QColor &color) const {
+	auto gradient = QLinearGradient(
+		QPointF(0, 0),
+		QPointF(width, 0));
+
+	auto tempColor = color;
+	tempColor.setAlphaF(0);
+	const auto edge = tempColor;
+	tempColor.setAlphaF(kMaxGlareOpaque);
+	const auto middle = tempColor;
+	gradient.setStops({
+		{ 0., edge },
+		{ .5, middle },
+		{ 1., edge },
+	});
+	return gradient;
+}
+
+void GlareEffect::validate(
+		const QColor &color,
+		Fn<void()> updateCallback,
+		crl::time timeout,
+		crl::time duration) {
+	if (anim::Disabled()) {
+		return;
+	}
+	if (!width) {
+		width = st::gradientButtonGlareWidth;
+	}
+	animation.init([=](crl::time now) {
+		if (const auto diff = (now - glare.deathTime); diff > 0) {
+			if (diff > timeout && !paused) {
+				glare = {
+					.birthTime = now,
+					.deathTime = now + duration,
+				};
+				updateCallback();
+			}
+		} else {
+			updateCallback();
+		}
+	});
+	animation.start();
+	{
+		auto newPixmap = QPixmap(QSize(width, 1)
+			* style::DevicePixelRatio());
+		newPixmap.setDevicePixelRatio(style::DevicePixelRatio());
+		newPixmap.fill(Qt::transparent);
+		{
+			auto p = QPainter(&newPixmap);
+			p.fillRect(newPixmap.rect(), QBrush(computeGradient(color)));
+		}
+		pixmap = std::move(newPixmap);
+	}
+}
+
+} // namespace Ui