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Telegram/SourceFiles/ui/controls/send_as_button.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/controls/send_as_button.h"
+
+#include "ui/effects/cross_animation.h"
+#include "ui/painter.h"
+#include "styles/style_chat_helpers.h"
+
+namespace Ui {
+
+SendAsButton::SendAsButton(QWidget *parent, const style::SendAsButton &st)
+: AbstractButton(parent)
+, _st(st) {
+	resize(_st.width, _st.height);
+}
+
+void SendAsButton::setUserpic(QImage userpic) {
+	_userpic = std::move(userpic);
+	update();
+}
+
+void SendAsButton::setActive(bool active) {
+	if (_active == active) {
+		return;
+	}
+	_active = active;
+	_activeAnimation.start(
+		[=] { update(); },
+		_active ? 0. : 1.,
+		_active ? 1. : 0.,
+		_st.duration);
+}
+
+void SendAsButton::paintEvent(QPaintEvent *e) {
+	auto p = QPainter(this);
+
+	const auto left = (width() - _st.size) / 2;
+	const auto top = (height() - _st.size) / 2;
+
+	const auto active = _activeAnimation.value(_active ? 1. : 0.);
+	if (active < 1. && !_userpic.isNull()) {
+		p.drawImage(QRect(left, top, _st.size, _st.size), _userpic);
+	}
+	if (active > 0.) {
+		p.setOpacity(active);
+
+		p.setPen(Qt::NoPen);
+		p.setBrush(_st.activeBg);
+		{
+			PainterHighQualityEnabler hq(p);
+			p.drawEllipse(left, top, _st.size, _st.size);
+		}
+
+		CrossAnimation::paint(
+			p,
+			_st.cross,
+			_st.activeFg,
+			left,
+			top,
+			width(),
+			active);
+	}
+}
+
+} // namespace Ui