48 lines
1.2 KiB
C++
48 lines
1.2 KiB
C++
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/*
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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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namespace Ui {
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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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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::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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} // namespace Ui
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