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把 QML 应用程序移植到 Qt5 范例

The new version of Qt Quick in Qt 5 brings in some changes to the way QML applications are developed. For the complete list of changes that affect existing QML applications, refer to 把 QML 应用程序移植到 Qt5 .

This topic will walk through the porting process to make the flickr Qt 4 QML demo work on Qt 5. If you have the SDK based on Qt 4.8 installed, you can find this demo application under <install_dir_root>/Examples/4.x/declarative/demos/ .

Follow these step-by-step instructions to port the flickr Qt 4 QML application work to Qt 5:

1. 打开 flickr project using Qt Creator.
2. Edit all the .qml files and replace the import QtQuick 1.0 statements with import QtQuick 2.3 .
3. Add the additional import QtQuick.XmlListModel 2.0 statement to qml/common/RssModel.qml .

   注意： XmlListModel is part of a submodule under QtQuick and it must be imported explicitly in order to use it.

4. Make the following changes to qmlapplicationviewer/qmlapplicationviewer.h :
   • Replace the #include <QtDeclarative/QDeclarativeView> with #include <QQuickView> .
   • 替换 QDeclarativeView with QQuickView in the class declaration for QmlApplicationViewer .
   • Replace the parameter for QmlApplicationViewer constructor from QWidget to QWindow .
5. Make the following changes to qmlapplicationviewer/qmlapplicationviewer.cpp :
   • Replace all the QtCore and QtDeclarative include statements with these:

     #include <QCoreApplication>
     
     #include <QDir>
     
     
     #include <QFileInfo>
     
     
     #include <QQmlComponent>
     
     
     #include <QQmlEngine>
     
     
     #include <QQmlContext>
     
     
     #include <QDebug>
     
     								

   • Replace all instances of QWidget with QWindow ，和 QDeclarativeView with QQuickView .
   • Remove the code between #if defined(Q_OS_SYMBIAN) and #endif macros as Symbian platform is not supported in Qt 5.
   • Remove the code between #if QT_VERSION < 0x040702 and #else ，和 #endif // QT_VERSION < 0x040702 macros towards the end.
6. Save changes to the project and run the application.

Once you see the application running, check whether it behaves as expected. Here is a snapshot of the application running on Ubuntu v12.04:

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把 QML 应用程序移植到 Qt5