mirror of
https://github.com/AyuGram/AyuGramDesktop.git
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23rd
57 lines
1.4 KiB
C++
57 lines
1.4 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/chat/continuous_scroll.h"
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#include <QWheelEvent>
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#include <QKeyEvent>
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namespace Ui {
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ContinuousScroll::ContinuousScroll(
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QWidget *parent,
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const style::ScrollArea &st,
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Qt::Orientation orientation)
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: ElasticScroll(parent, st, orientation) {
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setCustomWheelProcess([=](not_null<QWheelEvent*> e) {
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if (_tracking
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&& !e->angleDelta().isNull()
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&& (e->angleDelta().y() < 0)
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&& (scrollTopMax() == scrollTop())) {
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_addContentRequests.fire({});
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// Carry into freshly appended content, else swallow the over-scroll.
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return !base::take(_contentAdded);
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}
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return false;
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});
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}
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void ContinuousScroll::keyPressEvent(QKeyEvent *e) {
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const auto key = e->key();
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if (_tracking
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&& (key == Qt::Key_Down || key == Qt::Key_PageDown)
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&& (scrollTopMax() == scrollTop())) {
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_addContentRequests.fire({});
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base::take(_contentAdded);
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}
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ElasticScroll::keyPressEvent(e);
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}
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void ContinuousScroll::setTrackingContent(bool value) {
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_tracking = value;
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}
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void ContinuousScroll::contentAdded() {
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_contentAdded = true;
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}
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rpl::producer<> ContinuousScroll::addContentRequests() const {
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return _addContentRequests.events();
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}
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} // namespace Ui
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