Now base::lambda can be copied and can wrap any immutable lambda. For mutable lambdas there is base::lambda_once (which you're supposed to call only once to pass data through lambda captures, for example by using std::unique_ptr). Generally base::lambda is passed by value and base::lambda_once is passed by rvalue reference.
		
			
				
	
	
		
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			73 lines
		
	
	
	
		
			2 KiB
		
	
	
	
		
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/*
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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 "boxes/abstractbox.h"
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namespace Ui {
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class RoundCheckbox;
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} // namespace Ui
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class BackgroundBox : public BoxContent {
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public:
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	BackgroundBox(QWidget*);
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protected:
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	void prepare() override;
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private:
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	void backgroundChosen(int index);
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	class Inner;
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	QPointer<Inner> _inner;
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};
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// This class is hold in header because it requires Qt preprocessing.
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class BackgroundBox::Inner : public TWidget, public RPCSender, private base::Subscriber {
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public:
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	Inner(QWidget *parent);
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	void setBackgroundChosenCallback(base::lambda<void(int index)> callback) {
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		_backgroundChosenCallback = std::move(callback);
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	}
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	~Inner();
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protected:
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	void paintEvent(QPaintEvent *e) override;
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	void mouseMoveEvent(QMouseEvent *e) override;
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	void mousePressEvent(QMouseEvent *e) override;
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	void mouseReleaseEvent(QMouseEvent *e) override;
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private:
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	void gotWallpapers(const MTPVector<MTPWallPaper> &result);
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	void updateWallpapers();
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	base::lambda<void(int index)> _backgroundChosenCallback;
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	int _bgCount = 0;
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	int _rows = 0;
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	int _over = -1;
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	int _overDown = -1;
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	std::unique_ptr<Ui::RoundCheckbox> _check; // this is not a widget
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};
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