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Telegram/SourceFiles/ui/controls/jump_down_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/jump_down_button.h"
+
+#include "ui/effects/ripple_animation.h"
+#include "ui/unread_badge_paint.h"
+#include "styles/style_chat_helpers.h"
+
+namespace Ui {
+
+JumpDownButton::JumpDownButton(
+	QWidget *parent,
+	const style::TwoIconButton &st)
+: RippleButton(parent, st.ripple)
+, _st(st) {
+	resize(_st.width, _st.height);
+	setCursor(style::cur_pointer);
+
+	hide();
+}
+
+QImage JumpDownButton::prepareRippleMask() const {
+	return Ui::RippleAnimation::EllipseMask(
+		QSize(_st.rippleAreaSize, _st.rippleAreaSize));
+}
+
+QPoint JumpDownButton::prepareRippleStartPosition() const {
+	return mapFromGlobal(QCursor::pos()) - _st.rippleAreaPosition;
+}
+
+void JumpDownButton::paintEvent(QPaintEvent *e) {
+	auto p = QPainter(this);
+
+	const auto over = isOver();
+	const auto down = isDown();
+	((over || down)
+		? _st.iconBelowOver
+		: _st.iconBelow).paint(p, _st.iconPosition, width());
+	paintRipple(p, _st.rippleAreaPosition.x(), _st.rippleAreaPosition.y());
+	((over || down)
+		? _st.iconAboveOver
+		: _st.iconAbove).paint(p, _st.iconPosition, width());
+	if (_unreadCount > 0) {
+		auto unreadString = QString::number(_unreadCount);
+
+		Ui::UnreadBadgeStyle st;
+		st.align = style::al_center;
+		st.font = st::historyToDownBadgeFont;
+		st.size = st::historyToDownBadgeSize;
+		st.sizeId = Ui::UnreadBadgeSize::HistoryToDown;
+		Ui::PaintUnreadBadge(p, unreadString, width(), 0, st, 4);
+	}
+}
+
+void JumpDownButton::setUnreadCount(int unreadCount) {
+	if (_unreadCount != unreadCount) {
+		_unreadCount = unreadCount;
+		update();
+	}
+}
+
+} // namespace Ui