/usr/include/qgis/qgsfocuswatcher.h is in libqgis-dev 2.18.17+dfsg-1.
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qgsfocuswatcher.h
-----------------
Date : April 2016
Copyright : (C) 2016 by Nyall Dawson
Email : nyall dot dawson at gmail 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. *
* *
***************************************************************************/
#ifndef QGSFOCUSWATCHER_H
#define QGSFOCUSWATCHER_H
#include <QObject>
/** \ingroup gui
* \class QgsFocusWatcher
* A event filter for watching for focus events on a parent object. Usually QObjects must
* subclass and override methods like focusOutEvent to handle focus events. Using this class
* as an event filter avoids the need to subclass objects and the focus events can be directly
* caught using the emitted signals.
* \note added in 2.16
*/
class GUI_EXPORT QgsFocusWatcher : public QObject
{
Q_OBJECT
public:
/** Constructor for QgsFocusWatcher.
* @param parent parent widget to catch focus events for. This class will automatically be
* installed as an event filter for parent.
*/
explicit QgsFocusWatcher( QObject* parent );
virtual bool eventFilter( QObject* obj, QEvent* event ) override;
signals:
/** Emitted when parent object's focus changes.
* @param focused true if object gained focus, false if object lost focus
*/
void focusChanged( bool focused );
//! Emitted when parent object gains focus.
void focusIn();
//! Emitted when parent object loses focus.
void focusOut();
};
#endif //QGSFOCUSWATCHER_H
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