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Diffstat (limited to 'examples/declarative/cppextensions/imageprovider/imageprovider.cpp')
-rw-r--r-- | examples/declarative/cppextensions/imageprovider/imageprovider.cpp | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/examples/declarative/cppextensions/imageprovider/imageprovider.cpp b/examples/declarative/cppextensions/imageprovider/imageprovider.cpp new file mode 100644 index 0000000..0281b4a --- /dev/null +++ b/examples/declarative/cppextensions/imageprovider/imageprovider.cpp @@ -0,0 +1,117 @@ +/**************************************************************************** +** +** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the demonstration applications 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 Nokia Corporation 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, +** 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." +** $QT_END_LICENSE$ +** +****************************************************************************/ + + +#include <qdeclarativeextensionplugin.h> + +#include <qdeclarativeengine.h> +#include <qdeclarativecontext.h> +#include <qdeclarative.h> +#include <qdeclarativeitem.h> +#include <qdeclarativeimageprovider.h> +#include <qdeclarativeview.h> +#include <QImage> +#include <QPainter> + +/* + This example illustrates using a QDeclarativeImageProvider to serve + images asynchronously. +*/ + +//![0] +class ColorImageProvider : public QDeclarativeImageProvider +{ +public: + // This is run in a low priority thread. + QImage request(const QString &id, QSize *size, const QSize &req_size) + { + if (size) *size = QSize(100,50); + QImage image( + req_size.width() > 0 ? req_size.width() : 100, + req_size.height() > 0 ? req_size.height() : 50, + QImage::Format_RGB32); + image.fill(QColor(id).rgba()); + QPainter p(&image); + QFont f = p.font(); + f.setPixelSize(30); + p.setFont(f); + p.setPen(Qt::black); + if (req_size.isValid()) + p.scale(req_size.width()/100.0, req_size.height()/50.0); + p.drawText(QRectF(0,0,100,50),Qt::AlignCenter,id); + return image; + } +}; + + +class ImageProviderExtensionPlugin : public QDeclarativeExtensionPlugin +{ + Q_OBJECT +public: + void registerTypes(const char *uri) { + Q_UNUSED(uri); + + } + + void initializeEngine(QDeclarativeEngine *engine, const char *uri) { + Q_UNUSED(uri); + + engine->addImageProvider("colors", new ColorImageProvider); + + QStringList dataList; + dataList.append("image://colors/red"); + dataList.append("image://colors/green"); + dataList.append("image://colors/blue"); + dataList.append("image://colors/brown"); + dataList.append("image://colors/orange"); + dataList.append("image://colors/purple"); + dataList.append("image://colors/yellow"); + + QDeclarativeContext *ctxt = engine->rootContext(); + ctxt->setContextProperty("myModel", QVariant::fromValue(dataList)); + } + +}; + +#include "imageprovider.moc" + +Q_EXPORT_PLUGIN(ImageProviderExtensionPlugin); +//![0] + |