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Add a QgsFocusKeeper class to avoid crashes related to focus loss
Will be use to solve crash of #30210 Credits to @nyalldawson for pointing out the fix of #31905 as a reference. (cherry picked from commit f9bfbe7)
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/*************************************************************************** | ||
qgsfocuskeeper.cpp | ||
----------------- | ||
Date : May 2020 | ||
Copyright : (C) 2020 Even Rouault | ||
Email : even dot rouault at spatialys dot com | ||
*************************************************************************** | ||
* * | ||
* This program 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 2 of the License, or * | ||
* (at your option) any later version. * | ||
* * | ||
***************************************************************************/ | ||
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#include "qgsfocuskeeper.h" | ||
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#include <QApplication> | ||
#include <QEvent> | ||
#include <QWidget> | ||
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QgsFocusKeeper::QgsFocusKeeper(): mWidgetToKeepFocused( QApplication::focusWidget() ) | ||
{ | ||
mWidgetToKeepFocused->installEventFilter( this ); | ||
} | ||
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QgsFocusKeeper::~QgsFocusKeeper() | ||
{ | ||
mWidgetToKeepFocused->removeEventFilter( this ); | ||
} | ||
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bool QgsFocusKeeper::eventFilter( QObject *obj, QEvent *event ) | ||
{ | ||
if ( obj == mWidgetToKeepFocused && event && | ||
( event->type() == QEvent::FocusOut || event->type() == QEvent::FocusAboutToChange ) ) | ||
{ | ||
return true; | ||
} | ||
return QObject::eventFilter( obj, event ); | ||
} |
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/*************************************************************************** | ||
qgsfocuskeeper.h | ||
--------------- | ||
Date : May 2020 | ||
Copyright : (C) 2020 Even Rouault | ||
Email : even dot rouault at spatialys dot com | ||
*************************************************************************** | ||
* * | ||
* This program 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 2 of the License, or * | ||
* (at your option) any later version. * | ||
* * | ||
***************************************************************************/ | ||
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#ifndef QGSFOCUSKEEPER_H | ||
#define QGSFOCUSKEEPER_H | ||
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#include "qgis_gui.h" | ||
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#define SIP_NO_FILE | ||
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#include <QObject> | ||
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class QWidget; | ||
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/** | ||
* \ingroup gui | ||
* \class QgsFocusKeeper | ||
* Trick to keep a widget focused and avoid QT crashes | ||
* \note not available in Python bindings | ||
* \since QGIS 3.14 | ||
*/ | ||
class GUI_EXPORT QgsFocusKeeper : public QObject | ||
{ | ||
Q_OBJECT | ||
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QWidget *mWidgetToKeepFocused = nullptr; | ||
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public: | ||
QgsFocusKeeper(); | ||
~QgsFocusKeeper() override; | ||
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protected: | ||
bool eventFilter( QObject *obj, QEvent *event ) override; | ||
}; | ||
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#endif // QGSFOCUSKEEPER_H |