C++/Qt/QCheckBox

Subclass QCheckBox and handle mouse event

<source lang="cpp"> /****************************************************************************

• • Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
  • All rights reserved.
  • Contact: Nokia Corporation (qt-info@nokia.com)
  • This file is part of the documentation of the Qt Toolkit.
  • $QT_BEGIN_LICENSE:LGPL$
  • Commercial Usage
  • Licensees holding valid Qt Commercial licenses may use this file in
  • accordance with the Qt Commercial License Agreement provided with the
  • Software or, alternatively, in accordance with the terms contained in
  • a written agreement between you and Nokia.
  • GNU Lesser General Public License Usage
  • Alternatively, this file may be used under the terms of the GNU Lesser
  • General Public License version 2.1 as published by the Free Software
  • Foundation and appearing in the file LICENSE.LGPL included in the
  • packaging of this file. Please review the following information to
  • ensure the GNU Lesser General Public License version 2.1 requirements
  • will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
  • In addition, as a special exception, Nokia gives you certain additional
  • rights. These rights are described in the Nokia Qt LGPL Exception
  • version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
  • GNU General Public License Usage
  • Alternatively, this file may be used under the terms of the GNU
  • General Public License version 3.0 as published by the Free Software
  • Foundation and appearing in the file LICENSE.GPL included in the
  • packaging of this file. Please review the following information to
  • ensure the GNU General Public License version 3.0 requirements will be
  • met: http://www.gnu.org/copyleft/gpl.html.
  • If you have questions regarding the use of this file, please contact
  • Nokia at qt-info@nokia.com.
  • $QT_END_LICENSE$
  • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • /

1. include <QCheckBox>
2. include <QMouseEvent>

class MyCheckBox : public QCheckBox { public:

   void mousePressEvent(QMouseEvent *event);

}; void MyCheckBox::mousePressEvent(QMouseEvent *event) {

   if (event->button() == Qt::LeftButton) {
       // handle left mouse button here
   } else {
       // pass on other buttons to base class
       QCheckBox::mousePressEvent(event);
   }

} class MyWidget : public QWidget { public:

   bool event(QEvent *event);

}; static const int MyCustomEventType = 1099; class MyCustomEvent : public QEvent { public:

   MyCustomEvent() : QEvent((QEvent::Type)MyCustomEventType) {}

}; bool MyWidget::event(QEvent *event) {

   if (event->type() == QEvent::KeyPress) {
    QKeyEvent *ke = static_cast<QKeyEvent *>(event);
    if (ke->key() == Qt::Key_Tab) {
       return true;
    }
   } else if (event->type() == MyCustomEventType) {
    MyCustomEvent *myEvent = static_cast<MyCustomEvent *>(event);
      return true;
   }
   return QWidget::event(event);

} int main() { }

 </source>