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| ** Copyright (C) 2015 Canonical Limited and/or its subsidiary(-ies) |
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| ** This file is part of the demonstration applications of the Qt Toolkit. |
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| ****************************************************************************/ |
| |
| |
| #include <qqmlextensionplugin.h> |
| |
| #include <qqmlengine.h> |
| #include <qquickimageprovider.h> |
| #include <QDebug> |
| #include <QImage> |
| #include <QThreadPool> |
| |
| class AsyncImageResponseRunnable : public QObject, public QRunnable |
| { |
| Q_OBJECT |
| |
| signals: |
| void done(QImage image); |
| |
| public: |
| AsyncImageResponseRunnable(const QString &id, const QSize &requestedSize) |
| : m_id(id), m_requestedSize(requestedSize) {} |
| |
| void run() override |
| { |
| auto image = QImage(50, 50, QImage::Format_RGB32); |
| if (m_id == QLatin1String("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); |
| |
| emit done(image); |
| } |
| |
| private: |
| QString m_id; |
| QSize m_requestedSize; |
| }; |
| |
| class AsyncImageResponse : public QQuickImageResponse |
| { |
| public: |
| AsyncImageResponse(const QString &id, const QSize &requestedSize, QThreadPool *pool) |
| { |
| auto runnable = new AsyncImageResponseRunnable(id, requestedSize); |
| connect(runnable, &AsyncImageResponseRunnable::done, this, &AsyncImageResponse::handleDone); |
| pool->start(runnable); |
| } |
| |
| void handleDone(QImage image) { |
| m_image = image; |
| emit finished(); |
| } |
| |
| QQuickTextureFactory *textureFactory() const override |
| { |
| return QQuickTextureFactory::textureFactoryForImage(m_image); |
| } |
| |
| QImage m_image; |
| }; |
| |
| class AsyncImageProvider : public QQuickAsyncImageProvider |
| { |
| public: |
| QQuickImageResponse *requestImageResponse(const QString &id, const QSize &requestedSize) override |
| { |
| AsyncImageResponse *response = new AsyncImageResponse(id, requestedSize, &pool); |
| return response; |
| } |
| |
| private: |
| QThreadPool pool; |
| }; |
| |
| |
| class ImageProviderExtensionPlugin : public QQmlEngineExtensionPlugin |
| { |
| Q_OBJECT |
| Q_PLUGIN_METADATA(IID QQmlEngineExtensionInterface_iid) |
| public: |
| void initializeEngine(QQmlEngine *engine, const char *uri) override |
| { |
| Q_UNUSED(uri); |
| engine->addImageProvider("async", new AsyncImageProvider); |
| } |
| |
| }; |
| |
| #include "imageresponseprovider.moc" |