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# displaywidget.h Example File
tools/qtdemo/displaywidget.h

     /****************************************************************************
     **
     ** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
     **
     ** This file is part of the example classes of the Qt Toolkit.
     **
     ** This file may be used under the terms of the GNU General Public
     ** License version 2.0 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 GNU
     ** General Public Licensing requirements will be met:
     ** http://www.trolltech.com/products/qt/opensource.html
     **
     ** If you are unsure which license is appropriate for your use, please
     ** review the following information:
     ** http://www.trolltech.com/products/qt/licensing.html or contact the
     ** sales department at sales@trolltech.com.
     **
     ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
     ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
     **
     ****************************************************************************/

     #ifndef DISPLAYWIDGET_H
     #define DISPLAYWIDGET_H

     #include <QBasicTimer>
     #include <QWidget>

     class DisplayShape;

     class DisplayWidget : public QWidget
     {
         Q_OBJECT

     public:
         DisplayWidget(QWidget *parent = 0);
         QSize minimumSizeHint() const;
         DisplayShape *shape(int index) const;
         int shapesCount() const;
         void appendShape(DisplayShape *shape);
         void enableUpdates();
         void insertShape(int position, DisplayShape *shape);
         void reset();

     protected:
         void mouseMoveEvent(QMouseEvent *event);
         void mousePressEvent(QMouseEvent *event);
         void paintEvent(QPaintEvent *event);
         void timerEvent(QTimerEvent *event);

     signals:
         void actionRequested(const QString &name);
         void displayEmpty();
         void categoryRequested(const QString &name);
         void documentationRequested(const QString &name);
         void exampleRequested(const QString &name);
         void launchRequested(const QString &name);

     private:
         bool empty;
         bool emptying;
         bool updatesEnabled;
         QList<DisplayShape*> shapes;
         QBasicTimer timer;

     #if defined(Q_WS_X11)
     private slots:
         void toggleXRender();

     private:
         int numFrames;
         int frameTime;
         int avgRate;
         bool testDrawSpeed;
     #endif
     };

     #endif