tdesktop/Telegram/SourceFiles/ui/abstract_button.h

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/*
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.
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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
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#include <rpl/event_stream.h>
#include "ui/rp_widget.h"
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#include "base/flags.h"
namespace Ui {
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class AbstractButton : public RpWidget {
Q_OBJECT
public:
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AbstractButton(QWidget *parent);
Qt::KeyboardModifiers clickModifiers() const {
return _modifiers;
}
void setDisabled(bool disabled = true);
void clearState();
bool isOver() const {
return _state & StateFlag::Over;
}
bool isDown() const {
return _state & StateFlag::Down;
}
bool isDisabled() const {
return _state & StateFlag::Disabled;
}
void setPointerCursor(bool enablePointerCursor);
void setAcceptBoth(bool acceptBoth = true);
void setClickedCallback(base::lambda<void()> callback) {
_clickedCallback = std::move(callback);
}
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auto clicks() const {
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return _clicks.events();
}
template <typename Handler>
void addClickHandler(Handler &&handler) {
clicks() | rpl::start_with_next(
std::forward<Handler>(handler),
lifetime());
}
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protected:
void enterEventHook(QEvent *e) override;
void leaveEventHook(QEvent *e) override;
void mousePressEvent(QMouseEvent *e) override;
void mouseMoveEvent(QMouseEvent *e) override;
void mouseReleaseEvent(QMouseEvent *e) override;
signals:
void clicked();
protected:
enum class StateFlag {
None = 0,
Over = (1 << 0),
Down = (1 << 1),
Disabled = (1 << 2),
};
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using State = base::flags<StateFlag>;
State state() const {
return _state;
}
enum class StateChangeSource {
ByUser = 0x00,
ByPress = 0x01,
ByHover = 0x02,
};
void setOver(bool over, StateChangeSource source = StateChangeSource::ByUser);
virtual void onStateChanged(State was, StateChangeSource source) {
}
private:
void updateCursor();
void checkIfOver(QPoint localPos);
State _state = StateFlag::None;
bool _acceptBoth = false;
Qt::KeyboardModifiers _modifiers;
bool _enablePointerCursor = true;
base::lambda<void()> _clickedCallback;
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rpl::event_stream<> _clicks;
};
} // namespace Ui