138 lines
3.5 KiB
C++
138 lines
3.5 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
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#include "ui/widgets/gradient_round_button.h"
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#include "ui/image/image_prepare.h"
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#include "styles/style_boxes.h"
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namespace Ui {
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namespace {
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constexpr auto kMaxGlareOpaque = 0.5;
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} // namespace
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GradientButton::GradientButton(QWidget *widget, QGradientStops stops)
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: RippleButton(widget, st::defaultRippleAnimation)
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, _stops(std::move(stops)) {
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}
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void GradientButton::paintEvent(QPaintEvent *e) {
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QPainter p(this);
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validateBg();
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p.drawImage(0, 0, _bg);
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paintGlare(p);
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const auto ripple = QColor(0, 0, 0, 36);
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paintRipple(p, 0, 0, &ripple);
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}
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void GradientButton::paintGlare(QPainter &p) {
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if (!_glare.glare.birthTime) {
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return;
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}
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const auto progress = (crl::now() - _glare.glare.birthTime)
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/ float64(_glare.glare.deathTime - _glare.glare.birthTime);
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const auto x = (-_glare.width) + (width() + _glare.width * 2) * progress;
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const auto h = height();
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const auto edgeWidth = _glare.width + st::roundRadiusLarge;
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if (x > edgeWidth && x < (width() - edgeWidth)) {
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p.drawTiledPixmap(x, 0, _glare.width, h, _glare.pixmap, 0, 0);
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} else {
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auto frame = QImage(
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QSize(_glare.width, h) * style::DevicePixelRatio(),
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QImage::Format_ARGB32_Premultiplied);
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frame.setDevicePixelRatio(style::DevicePixelRatio());
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frame.fill(Qt::transparent);
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{
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Painter q(&frame);
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q.drawTiledPixmap(0, 0, _glare.width, h, _glare.pixmap, 0, 0);
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q.setCompositionMode(QPainter::CompositionMode_DestinationIn);
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q.drawImage(-x, 0, _bg, 0, 0);
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}
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p.drawImage(x, 0, frame);
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}
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}
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void GradientButton::validateBg() {
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const auto factor = devicePixelRatio();
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if (!_bg.isNull()
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&& (_bg.devicePixelRatio() == factor)
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&& (_bg.size() == size() * factor)) {
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return;
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}
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_bg = QImage(size() * factor, QImage::Format_ARGB32_Premultiplied);
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_bg.setDevicePixelRatio(factor);
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auto p = QPainter(&_bg);
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auto gradient = QLinearGradient(QPointF(0, 0), QPointF(width(), 0));
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gradient.setStops(_stops);
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p.fillRect(rect(), gradient);
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p.end();
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_bg = Images::Round(std::move(_bg), ImageRoundRadius::Large);
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}
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void GradientButton::setGlarePaused(bool paused) {
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_glare.paused = paused;
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}
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void GradientButton::validateGlare() {
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if (anim::Disabled()) {
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return;
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}
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_glare.width = st::gradientButtonGlareWidth;
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_glare.animation.init([=](crl::time now) {
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if (const auto diff = (now - _glare.glare.deathTime); diff > 0) {
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if (diff > st::gradientButtonGlareTimeout && !_glare.paused) {
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_glare.glare = Glare{
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.birthTime = now,
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.deathTime = now + st::gradientButtonGlareDuration,
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};
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update();
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}
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} else {
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update();
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}
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});
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_glare.animation.start();
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{
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auto pixmap = QPixmap(QSize(_glare.width, 1)
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* style::DevicePixelRatio());
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pixmap.setDevicePixelRatio(style::DevicePixelRatio());
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pixmap.fill(Qt::transparent);
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{
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Painter p(&pixmap);
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auto gradient = QLinearGradient(
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QPointF(0, 0),
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QPointF(_glare.width, 0));
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auto color = st::premiumButtonFg->c;
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color.setAlphaF(0);
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const auto edge = color;
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color.setAlphaF(kMaxGlareOpaque);
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const auto middle = color;
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gradient.setStops({
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{ 0., edge },
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{ .5, middle },
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{ 1., edge },
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});
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p.fillRect(pixmap.rect(), QBrush(gradient));
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}
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_glare.pixmap = std::move(pixmap);
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}
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}
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void GradientButton::startGlareAnimation() {
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validateGlare();
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}
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} // namespace Ui
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