tdesktop/Telegram/SourceFiles/ui/resize_area.h

92 lines
2.2 KiB
C++

/*
This file is part of Telegram Desktop,
the official desktop version of Telegram messaging app, see https://telegram.org
Telegram Desktop is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
It is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
In addition, as a special exception, the copyright holders give permission
to link the code of portions of this program with the OpenSSL library.
Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
*/
#pragma once
#include "ui/rp_widget.h"
namespace Ui {
class ResizeArea : public RpWidget {
public:
ResizeArea(QWidget *parent) : RpWidget(parent) {
setCursor(style::cur_sizehor);
}
rpl::producer<int> moveLeft() const {
return _moveLeft.events();
}
template <typename Callback>
void addMoveLeftCallback(Callback &&callback) {
moveLeft()
| rpl::start_with_next(
std::forward<Callback>(callback),
lifetime());
}
rpl::producer<> moveFinished() const {
return _moveFinished.events();
}
template <typename Callback>
void addMoveFinishedCallback(Callback &&callback) {
moveFinished()
| rpl::start_with_next(
std::forward<Callback>(callback),
lifetime());
}
~ResizeArea() {
moveFinish();
}
protected:
void mousePressEvent(QMouseEvent *e) override {
if (e->button() == Qt::LeftButton) {
_moving = true;
_moveStartLeft = e->pos().x();
}
}
void mouseReleaseEvent(QMouseEvent *e) override {
if (e->button() == Qt::LeftButton) {
moveFinish();
}
}
void mouseMoveEvent(QMouseEvent *e) override {
if (_moving) {
_moveLeft.fire(e->globalPos().x() - _moveStartLeft);
}
}
private:
void moveFinish() {
if (base::take(_moving)) {
_moveFinished.fire({});
}
}
rpl::event_stream<int> _moveLeft;
rpl::event_stream<> _moveFinished;
int _moveStartLeft = 0;
bool _moving = false;
};
} // namespace Ui