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Diffstat (limited to 'examples/quick/imageresponseprovider/imageresponseprovider.cpp')
-rw-r--r-- | examples/quick/imageresponseprovider/imageresponseprovider.cpp | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/examples/quick/imageresponseprovider/imageresponseprovider.cpp b/examples/quick/imageresponseprovider/imageresponseprovider.cpp new file mode 100644 index 0000000000..bdec29114b --- /dev/null +++ b/examples/quick/imageresponseprovider/imageresponseprovider.cpp @@ -0,0 +1,123 @@ +/**************************************************************************** +** +** Copyright (C) 2015 Canonical Limited and/or its subsidiary(-ies) +** Contact: http://www.qt.io/licensing/ +** +** 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 The Qt Company Ltd 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 <qqmlextensionplugin.h> + +#include <qqmlengine.h> +#include <qquickimageprovider.h> +#include <QDebug> +#include <QImage> +#include <QThreadPool> + +class AsyncImageResponse : public QQuickImageResponse, public QRunnable +{ + public: + AsyncImageResponse(const QString &id, const QSize &requestedSize) + : m_id(id), m_requestedSize(requestedSize), m_texture(0) + { + setAutoDelete(false); + } + + QQuickTextureFactory *textureFactory() const + { + return m_texture; + } + + void run() + { + QImage image(50, 50, QImage::Format_RGB32); + if (m_id == "slow") { + qDebug() << "Slow, red, sleeping for 5 seconds"; + QThread::sleep(5); + image.fill(Qt::red); + } else { + qDebug() << "Fast, blue, sleeping for 1 second"; + QThread::sleep(1); + image.fill(Qt::blue); + } + if (m_requestedSize.isValid()) + image = image.scaled(m_requestedSize); + m_texture = QQuickTextureFactory::textureFactoryForImage(image); + emit finished(); + } + + QString m_id; + QSize m_requestedSize; + QQuickTextureFactory *m_texture; +}; + +class AsyncImageProvider : public QQuickAsyncImageProvider +{ +public: + QQuickImageResponse *requestImageResponse(const QString &id, const QSize &requestedSize) + { + AsyncImageResponse *response = new AsyncImageResponse(id, requestedSize); + pool.start(response); + return response; + } + +private: + QThreadPool pool; +}; + + +class ImageProviderExtensionPlugin : public QQmlExtensionPlugin +{ + Q_OBJECT + Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface") +public: + void registerTypes(const char *uri) + { + Q_UNUSED(uri); + } + + void initializeEngine(QQmlEngine *engine, const char *uri) + { + Q_UNUSED(uri); + engine->addImageProvider("async", new AsyncImageProvider); + } + +}; + + +#define QQmlExtensionInterface_iid "org.qt-project.Qt.QQmlExtensionInterface" + +#include "imageresponseprovider.moc" |