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     7 ** This file is part of the demonstration applications of the Qt Toolkit.

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    39 ****************************************************************************/

    40 

    41 

    42 #include <qdeclarativeextensionplugin.h>

    43 

    44 #include <qdeclarativeengine.h>

    45 #include <qdeclarativecontext.h>

    46 #include <qdeclarative.h>

    47 #include <qdeclarativeitem.h>

    48 #include <qdeclarativeimageprovider.h>

    49 #include <qdeclarativeview.h>

    50 #include <QImage>

    51 #include <QPainter>

    52 

    53 /*

    54    This example illustrates using a QDeclarativeImageProvider to serve

    55    images asynchronously.

    56 */

    57 

    58 //![0]

    59 class ColorImageProvider : public QDeclarativeImageProvider

    60 {

    61 public:

    62     // This is run in a low priority thread.

    63     QImage request(const QString &id, QSize *size, const QSize &req_size)

    64     {

    65         if (size) *size = QSize(100,50);

    66         QImage image(

    67                 req_size.width() > 0 ? req_size.width() : 100,

    68                 req_size.height() > 0 ? req_size.height() : 50,

    69                 QImage::Format_RGB32);

    70         image.fill(QColor(id).rgba());

    71         QPainter p(&image);

    72         QFont f = p.font();

    73         f.setPixelSize(30);

    74         p.setFont(f);

    75         p.setPen(Qt::black);

    76         if (req_size.isValid())

    77             p.scale(req_size.width()/100.0, req_size.height()/50.0);

    78         p.drawText(QRectF(0,0,100,50),Qt::AlignCenter,id);

    79         return image;

    80     }

    81 };

    82 

    83 

    84 class ImageProviderExtensionPlugin : public QDeclarativeExtensionPlugin

    85 {

    86     Q_OBJECT

    87 public:

    88     void registerTypes(const char *uri) {

    89         Q_UNUSED(uri);

    90 

    91     }

    92 

    93     void initializeEngine(QDeclarativeEngine *engine, const char *uri) {

    94         Q_UNUSED(uri);

    95 

    96         engine->addImageProvider("colors", new ColorImageProvider);

    97 

    98         QStringList dataList;

    99         dataList.append("image://colors/red");

   100         dataList.append("image://colors/green");

   101         dataList.append("image://colors/blue");

   102         dataList.append("image://colors/brown");

   103         dataList.append("image://colors/orange");

   104         dataList.append("image://colors/purple");

   105         dataList.append("image://colors/yellow");

   106 

   107         QDeclarativeContext *ctxt = engine->rootContext();

   108         ctxt->setContextProperty("myModel", QVariant::fromValue(dataList));

   109     }

   110 

   111 };

   112 

   113 #include "imageprovider.moc"

   114 

   115 Q_EXPORT_PLUGIN(ImageProviderExtensionPlugin);

   116 //![0]

   117