afb81b8278
Some checks failed
Docker. / Ubuntu (push) Has been cancelled
User-agent updater. / User-agent (push) Failing after 15s
Lock Threads / lock (push) Failing after 10s
Waiting for answer. / waiting-for-answer (push) Failing after 22s
Close stale issues and PRs / stale (push) Successful in 13s
Needs user action. / needs-user-action (push) Failing after 8s
Can't reproduce. / cant-reproduce (push) Failing after 8s
75 lines
1.6 KiB
C++
75 lines
1.6 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/chat/continuous_scroll.h"
|
|
|
|
#include <QScrollBar>
|
|
#include <QWheelEvent>
|
|
|
|
namespace Ui {
|
|
|
|
void ContinuousScroll::wheelEvent(QWheelEvent *e) {
|
|
if (_tracking
|
|
&& !e->angleDelta().isNull()
|
|
&& (e->angleDelta().y() < 0)
|
|
&& (scrollTopMax() == scrollTop())) {
|
|
_addContentRequests.fire({});
|
|
if (base::take(_contentAdded)) {
|
|
viewportEvent(e);
|
|
}
|
|
return;
|
|
}
|
|
ScrollArea::wheelEvent(e);
|
|
}
|
|
|
|
void ContinuousScroll::setTrackingContent(bool value) {
|
|
if (_tracking == value) {
|
|
return;
|
|
}
|
|
_tracking = value;
|
|
reconnect();
|
|
}
|
|
|
|
void ContinuousScroll::reconnect() {
|
|
if (!_tracking) {
|
|
_connection.release();
|
|
return;
|
|
}
|
|
const auto handleAction = [=](int action) {
|
|
const auto scroll = verticalScrollBar();
|
|
const auto step = (action == QAbstractSlider::SliderSingleStepAdd)
|
|
? scroll->singleStep()
|
|
: (action == QAbstractSlider::SliderPageStepAdd)
|
|
? scroll->pageStep()
|
|
: 0;
|
|
if (!action) {
|
|
return;
|
|
}
|
|
const auto newTop = scrollTop() + step;
|
|
if (newTop > scrollTopMax()) {
|
|
_addContentRequests.fire({});
|
|
if (base::take(_contentAdded)) {
|
|
scroll->setSliderPosition(newTop);
|
|
}
|
|
}
|
|
};
|
|
_connection = QObject::connect(
|
|
verticalScrollBar(),
|
|
&QAbstractSlider::actionTriggered,
|
|
handleAction);
|
|
}
|
|
|
|
void ContinuousScroll::contentAdded() {
|
|
_contentAdded = true;
|
|
}
|
|
|
|
rpl::producer<> ContinuousScroll::addContentRequests() const {
|
|
return _addContentRequests.events();
|
|
}
|
|
|
|
} // namespace Ui
|