135 lines
3.5 KiB
C++
135 lines
3.5 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop version of Telegram messaging app, see https://telegram.org
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Telegram Desktop is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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It is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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In addition, as a special exception, the copyright holders give permission
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to link the code of portions of this program with the OpenSSL library.
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Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
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Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
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*/
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#pragma once
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#include <rpl/event_stream.h>
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#include <rpl/map.h>
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#include <rpl/distinct_until_changed.h>
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namespace Ui {
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class RpWidget : public TWidget {
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public:
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RpWidget::RpWidget(QWidget *parent = nullptr) : TWidget(parent) {
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setGeometry(0, 0, 0, 0);
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}
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rpl::producer<QRect> geometryValue() const {
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auto &stream = eventStreams().geometry;
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return stream.events_starting_with_copy(geometry());
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}
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rpl::producer<QSize> sizeValue() const {
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return geometryValue()
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| rpl::map([](QRect &&value) { return value.size(); })
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| rpl::distinct_until_changed();
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}
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rpl::producer<int> heightValue() const {
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return geometryValue()
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| rpl::map([](QRect &&value) { return value.height(); })
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| rpl::distinct_until_changed();
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}
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rpl::producer<int> widthValue() const {
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return geometryValue()
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| rpl::map([](QRect &&value) { return value.width(); })
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| rpl::distinct_until_changed();
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}
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rpl::producer<QPoint> positionValue() const {
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return geometryValue()
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| rpl::map([](QRect &&value) { return value.topLeft(); })
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| rpl::distinct_until_changed();
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}
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rpl::producer<int> leftValue() const {
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return geometryValue()
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| rpl::map([](QRect &&value) { return value.left(); })
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| rpl::distinct_until_changed();
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}
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rpl::producer<int> topValue() const {
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return geometryValue()
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| rpl::map([](QRect &&value) { return value.top(); })
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| rpl::distinct_until_changed();
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}
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virtual rpl::producer<int> desiredHeightValue() const {
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return heightValue();
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}
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rpl::producer<QRect> paintRequest() const {
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return eventStreams().paint.events();
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}
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rpl::producer<> alive() const {
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return eventStreams().alive.events();
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}
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rpl::lifetime &lifetime() {
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return _lifetime;
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}
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protected:
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bool event(QEvent *event) override {
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switch (event->type()) {
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case QEvent::Move:
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case QEvent::Resize:
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if (auto streams = _eventStreams.get()) {
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auto that = weak(this);
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streams->geometry.fire_copy(geometry());
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if (!that) {
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return true;
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}
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}
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break;
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case QEvent::Paint:
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if (auto streams = _eventStreams.get()) {
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auto that = weak(this);
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streams->paint.fire_copy(
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static_cast<QPaintEvent*>(event)->rect());
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if (!that) {
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return true;
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}
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}
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break;
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}
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return TWidget::event(event);
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}
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private:
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struct EventStreams {
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rpl::event_stream<QRect> geometry;
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rpl::event_stream<QRect> paint;
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rpl::event_stream<> alive;
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};
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EventStreams &eventStreams() const {
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if (!_eventStreams) {
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_eventStreams = std::make_unique<EventStreams>();
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}
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return *_eventStreams;
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}
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mutable std::unique_ptr<EventStreams> _eventStreams;
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rpl::lifetime _lifetime;
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};
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} // namespace Ui
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