tdesktop/Telegram/SourceFiles/ui/widgets/gradient_round_button.cpp

48 lines
1.2 KiB
C++

/*
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/widgets/gradient_round_button.h"
#include "ui/image/image_prepare.h"
namespace Ui {
GradientButton::GradientButton(QWidget *widget, QGradientStops stops)
: RippleButton(widget, st::defaultRippleAnimation)
, _stops(std::move(stops)) {
}
void GradientButton::paintEvent(QPaintEvent *e) {
QPainter p(this);
validateBg();
p.drawImage(0, 0, _bg);
const auto ripple = QColor(0, 0, 0, 36);
paintRipple(p, 0, 0, &ripple);
}
void GradientButton::validateBg() {
const auto factor = devicePixelRatio();
if (!_bg.isNull()
&& (_bg.devicePixelRatio() == factor)
&& (_bg.size() == size() * factor)) {
return;
}
_bg = QImage(size() * factor, QImage::Format_ARGB32_Premultiplied);
_bg.setDevicePixelRatio(factor);
auto p = QPainter(&_bg);
auto gradient = QLinearGradient(QPointF(0, 0), QPointF(width(), 0));
gradient.setStops(_stops);
p.fillRect(rect(), gradient);
p.end();
_bg = Images::Round(std::move(_bg), ImageRoundRadius::Large);
}
} // namespace Ui