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==Handle QFocusEvent==

<source lang="cpp">
Foundations of Qt Development\Chapter06\eventlister\eventwidget.cpp
/*
* Copyright (c) 2006-2007, Johan Thelin
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of APress nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <QCloseEvent>
#include <QContextMenuEvent>
#include <QEvent>
#include <QFocusEvent>
#include <QHideEvent>
#include <QKeyEvent>
#include <QMouseEvent>
#include <QPaintEvent>
#include <QResizeEvent>
#include <QShowEvent>
#include <QWheelEvent>
#include "eventwidget.h"
EventWidget::EventWidget( QWidget *parent ) : QWidget( parent )
{
}
void EventWidget::closeEvent( QCloseEvent * event )
{
emit gotEvent( tr("closeEvent") );
}
void EventWidget::enterEvent( QEvent * event )
{
emit gotEvent( tr("enterEvent") );
}
void EventWidget::leaveEvent( QEvent * event )
{
emit gotEvent( tr("leaveEvent") );
}
void EventWidget::hideEvent( QHideEvent * event )
{
emit gotEvent( tr("hideEvent") );
}
void EventWidget::showEvent( QShowEvent * event )
{
emit gotEvent( tr("showEvent") );
}
void EventWidget::paintEvent( QPaintEvent * event )
{
emit gotEvent( tr("paintEvent") );
}
void EventWidget::contextMenuEvent( QContextMenuEvent * event )
{
emit gotEvent( tr("contextMenuEvent( x:%1, y:%2, reason:%3 )")
.arg(event->x())
.arg(event->y())
.arg(event->reason()==2?"Other":
event->reason()==1?"Keyboard":
"Mouse") );
}
void EventWidget::focusInEvent( QFocusEvent * event )
{
emit gotEvent( tr("focusInEvent( reason:%1 )")
.arg( event->reason()==0?"MouseFocusReason":
event->reason()==1?"TabFocusReason":
event->reason()==2?"BacktabFocusReason":
event->reason()==3?"ActiveWindowFocusReason":
event->reason()==4?"PopupFocusReason":
event->reason()==5?"ShortcutFocusReason":
event->reason()==6?"MenuBarFocusReason":
"OtherFocusReason" ) );
}
void EventWidget::focusOutEvent( QFocusEvent * event )
{
emit gotEvent( tr("focusOutEvent( reason:%1 )")
.arg( event->reason()==0?"MouseFocusReason":
event->reason()==1?"TabFocusReason":
event->reason()==2?"BacktabFocusReason":
event->reason()==3?"ActiveWindowFocusReason":
event->reason()==4?"PopupFocusReason":
event->reason()==5?"ShortcutFocusReason":
event->reason()==6?"MenuBarFocusReason":
"OtherFocusReason" ) );
}
void EventWidget::keyPressEvent( QKeyEvent * event )
{
emit gotEvent( tr("keyPressEvent( text:%1, modifiers:%2 )")
.arg( event->text() )
.arg( event->modifiers()==0?tr("NoModifier"):(
(event->modifiers()&Qt::ShiftModifier ==0?tr(""):
tr("ShiftModifier "))+
(event->modifiers()&Qt::ControlModifier ==0?tr(""):
tr("ControlModifier "))+
(event->modifiers()&Qt::AltModifier ==0?tr(""):
tr("AltModifier "))+
(event->modifiers()&Qt::MetaModifier ==0?tr(""):
tr("MetaModifier "))+
(event->modifiers()&Qt::KeypadModifier ==0?tr(""):
tr("KeypadModifier "))+
(event->modifiers()&Qt::GroupSwitchModifier==0?tr(""):
tr("GroupSwitchModifier")) ) ) );
}
void EventWidget::keyReleaseEvent( QKeyEvent * event )
{
emit gotEvent( tr("keyReleaseEvent( text:%1, modifiers:%2 )")
.arg( event->text() )
.arg( event->modifiers()==0?tr("NoModifier"):(
(event->modifiers()&Qt::ShiftModifier ==0?tr(""):
tr("ShiftModifier "))+
(event->modifiers()&Qt::ControlModifier ==0?tr(""):
tr("ControlModifier "))+
(event->modifiers()&Qt::AltModifier ==0?tr(""):
tr("AltModifier "))+
(event->modifiers()&Qt::MetaModifier ==0?tr(""):
tr("MetaModifier "))+
(event->modifiers()&Qt::KeypadModifier ==0?tr(""):
tr("KeypadModifier "))+
(event->modifiers()&Qt::GroupSwitchModifier==0?tr(""):
tr("GroupSwitchModifier")) ) ) );
}
void EventWidget::mouseDoubleClickEvent( QMouseEvent * event )
{
emit gotEvent( tr("mouseDoubleClickEvent( x:%1, y:%2, button:%3 )")
.arg( event->x() )
.arg( event->y() )
.arg( event->button()==Qt::LeftButton? "LeftButton":
event->button()==Qt::RightButton?"RightButton":
event->button()==Qt::MidButton? "MidButton":
event->button()==Qt::XButton1? "XButton1":
"XButton2" ) );
}
void EventWidget::mouseMoveEvent( QMouseEvent * event )
{
emit gotEvent( tr("mouseMoveEvent( x:%1, y:%2, button:%3 )")
.arg( event->x() )
.arg( event->y() )
.arg( event->button()==Qt::LeftButton? "LeftButton":
event->button()==Qt::RightButton?"RightButton":
event->button()==Qt::MidButton? "MidButton":
event->button()==Qt::XButton1? "XButton1":
"XButton2" ) );
}
void EventWidget::mousePressEvent( QMouseEvent * event )
{
emit gotEvent( tr("mousePressEvent( x:%1, y:%2, button:%3 )")
.arg( event->x() )
.arg( event->y() )
.arg( event->button()==Qt::LeftButton? "LeftButton":
event->button()==Qt::RightButton?"RightButton":
event->button()==Qt::MidButton? "MidButton":
event->button()==Qt::XButton1? "XButton1":
"XButton2" ) );
}
void EventWidget::mouseReleaseEvent( QMouseEvent * event )
{
emit gotEvent( tr("mouseReleaseEvent( x:%1, y:%2, button:%3 )")
.arg( event->x() )
.arg( event->y() )
.arg( event->button()==Qt::LeftButton? "LeftButton":
event->button()==Qt::RightButton?"RightButton":
event->button()==Qt::MidButton? "MidButton":
event->button()==Qt::XButton1? "XButton1":
"XButton2" ) );
}
void EventWidget::resizeEvent( QResizeEvent * event )
{
emit gotEvent( tr("resizeEvent( w:%1, h:%2 )")
.arg( event->size().width() )
.arg( event->size().height() ) );
}
void EventWidget::wheelEvent( QWheelEvent * event )
{
emit gotEvent( tr("wheelEvent( x:%1, y:%2, delta:%3, orientation:%4 )")
.arg( event->x() )
.arg( event->y() )
.arg( event->delta() ).arg( event->orientation()==1?
"Horizontal":"Vertical" ) );
}

Foundations of Qt Development\Chapter06\eventlister\eventwidget.h
/*
* Copyright (c) 2006-2007, Johan Thelin
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of APress nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef EVENTWIDGET_H
#define EVENTWIDGET_H
#include <QWidget>
class QCloseEvent;
class QContextMenuEvent;
class QEvent;
class QFocusEvent;
class QHideEvent;
class QKeyEvent;
class QMouseEvent;
class QPaintEvent;
class QResizeEvent;
class QShowEvent;
class QWheelEvent;
class EventWidget : public QWidget
{
Q_OBJECT

public:
EventWidget( QWidget *parent = 0 );
signals:
void gotEvent( const QString );
protected:
void closeEvent( QCloseEvent * event );
void contextMenuEvent( QContextMenuEvent * event );
void enterEvent( QEvent * event );
void focusInEvent( QFocusEvent * event );
void focusOutEvent( QFocusEvent * event );
void hideEvent( QHideEvent * event );
void keyPressEvent( QKeyEvent * event );
void keyReleaseEvent( QKeyEvent * event );
void leaveEvent( QEvent * event );
void mouseDoubleClickEvent( QMouseEvent * event );
void mouseMoveEvent( QMouseEvent * event );
void mousePressEvent( QMouseEvent * event );
void mouseReleaseEvent( QMouseEvent * event );
void paintEvent( QPaintEvent * event );
void resizeEvent( QResizeEvent * event );
void showEvent( QShowEvent * event );
void wheelEvent( QWheelEvent * event );
};
#endif // EVENTWIDGET_H

Foundations of Qt Development\Chapter06\eventlister\main.cpp
/*
* Copyright (c) 2006-2007, Johan Thelin
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of APress nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <QApplication>
#include <QTextEdit>
#include "eventwidget.h"
int main( int argc, char **argv )
{
QApplication app( argc, argv );

QTextEdit log;
EventWidget widget;

QObject::connect( &widget, SIGNAL(gotEvent(QString)), &log, SLOT(append(QString)) );

log.show();
widget.show();

return app.exec();
}

</source>

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