56 lines
1.5 KiB
C++
56 lines
1.5 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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namespace Ui {
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class FocusPersister {
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public:
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FocusPersister(QWidget *parent, QWidget *steal = nullptr)
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: _weak(GrabFocused(parent)) {
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if (steal) {
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steal->setFocus();
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}
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}
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~FocusPersister() {
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if (auto strong = _weak.data()) {
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if (auto window = strong->window()) {
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if (window->focusWidget() != strong) {
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strong->setFocus();
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}
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}
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}
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}
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private:
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static QWidget *GrabFocused(QWidget *parent) {
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if (auto window = parent ? parent->window() : nullptr) {
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return window->focusWidget();
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}
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return nullptr;
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}
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QPointer<QWidget> _weak;
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};
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} // namespace Ui
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