Qt 4.8: videowidget.cpp Example File (multimedia/videowidget/videowidget.cpp)

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# videowidget.cpp Example File

multimedia/videowidget/videowidget.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
     ** Contact: http://www.qt-project.org/legal
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "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 Digia Plc and its Subsidiary(-ies) 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,
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     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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     ****************************************************************************/

     #include "videowidget.h"

     #include "videowidgetsurface.h"

     #include <QtMultimedia>

     VideoWidget::VideoWidget(QWidget *parent)
         : QWidget(parent)
         , surface(0)
     {
         setAutoFillBackground(false);
         setAttribute(Qt::WA_NoSystemBackground, true);
         setAttribute(Qt::WA_PaintOnScreen, true);

         QPalette palette = this->palette();
         palette.setColor(QPalette::Background, Qt::black);
         setPalette(palette);

         setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding);

         surface = new VideoWidgetSurface(this);
     }

     VideoWidget::~VideoWidget()
     {
         delete surface;
     }

     QSize VideoWidget::sizeHint() const
     {
         return surface->surfaceFormat().sizeHint();
     }

     void VideoWidget::paintEvent(QPaintEvent *event)
     {
         QPainter painter(this);

         if (surface->isActive()) {
             const QRect videoRect = surface->videoRect();

             if (!videoRect.contains(event->rect())) {
                 QRegion region = event->region();
                 region.subtract(videoRect);

                 QBrush brush = palette().background();

                 foreach (const QRect &rect, region.rects())
                     painter.fillRect(rect, brush);
             }

             surface->paint(&painter);
         } else {
             painter.fillRect(event->rect(), palette().background());
         }
     }

     void VideoWidget::resizeEvent(QResizeEvent *event)
     {
         QWidget::resizeEvent(event);

         surface->updateVideoRect();
     }