QML1-vs-QML2

QtQuick 1 vs QtQuick

work in progress

The idea of this wiki page is to have a "some how" porting guide for customers, having a Qt 4.8/QtQuick 1 application, to get a Qt5/QtQuick 2 application. The focus is on the QML part, not the c++ part. What are new elements, which elements are deprecated, what needs to be changed.

ideas from Girish:

1. The change in javascript engines.
2. What's changed in the js syntax in QML2 (if any)
3. C++ api changes - like how does we create items these days? How is it different from QML1
4. Dependency on GLES2 unlike QML1

For porting an existing QtQuick 1 application to QtQuick 2 and make use of new features of QtQuick 2, there are some changes in the QML files necessary, which are listed below.

|. QtQuick 1 |. QtQuick 2 |

| import QtQuick 1.0 | import QtQuick 2.0|
| import Qt.labs.particles 1.0 | import QtQuick.Particles 2.0|
| import Qt.labs.shaders 1.0 | import QtQuick 2.0|
| import QtQuick 1.0 | import QtQuick.XmlListModel 2.0|
| import QtMobility.location 1.2 | import QtLocation 5.0|
| import QtMobility.sensors 1.3 | import QtSensors 5.0|
| import QtMobility.systeminfo 1.1 | import QtSystemInfo 5.0 |
| import QtMultimediaKit 1.1 | import QtMultimedia 5.0 |
| ./qmlviewer | ./qmlscene |

For a more detailed list of changes in QtQuick 2, see "What's New in Qt Quick 2":http://doc.qt.io/qt-5.0/qtquick2-whatsnew.html

See also the Qt documentation's "porting guide":http://doc.qt.io/qt-5.0/qtquick-porting-qt5.html

A description, how to port your Qt 4.x application to Qt 5 is "here":http://wiki.qt.io/Transition_from_Qt_4.x_to_Qt5

New QML elements in QtQuick2:

• a new particle system: http://doc.qt.io/qt-5.0/qmlmodule-qtquick-particles2-qtquick-particles-2.html
• new Shader effects system: http://doc.qt.io/qt-5.0/qtquick-effects-shaders.html
• "Canvas":http://doc.qt.io/qt-5.0/qml-qtquick2-canvas.html - Provides a 2D canvas element
• "CanvasGradient":http://doc.qt.io/qt-5.0/qml-qtquick2-qtquick2-canvasgradient.html - Context2D opaque CanvasGradient interface
• "Context2D":http://doc.qt.io/qt-5.0/qml-qtquick2-context2d.html - The Context2D API allows you to draw 2d graphic shapes on the Canvas item.
• "TextMetrics":http://doc.qt.io/qt-5.0/qml-qtquick2-qtquick2-textmetrics.html - Context2D TextMetrics interface
• "MultiPointTouchArea":http://doc.qt.io/qt-5.0/qml-qtquick2-multipointtoucharea.html - Enables handling of multiple touch points
• "TouchPoint":http://doc.qt.io/qt-5.0/qml-qtquick2-touchpoint.html - The TouchPoint element describes a touch point in a MultiPointTouchArea
• "PathAnimation":http://doc.qt.io/qt-5.0/qml-qtquick2-pathanimation.html - Animates position along a path
• "PathInterpolator":http://doc.qt.io/qt-5.0/qml-qtquick2-pathinterpolator.html - Allows manual animation along a path
• "AnimationController":http://doc.qt.io/qt-5.0/qml-qtquick2-animationcontroller.html - Allows manual control of animation progress
• "PathArc":http://doc.qt.io/qt-5.0/qml-qtquick2-patharc.html - Defines an arc in a Path
• "PathCurve":http://doc.qt.io/qt-5.0/qml-qtquick2-pathcurve.html - Defines a point on a Catmull-Rom curve in a Path
• "PathSvg":http://doc.qt.io/qt-5.0/qml-qtquick2-pathsvg.html - Defines a sub-path specified as a SVG path data string in a Path
• "Accessible":http://doc.qt.io/qt-5.0/qml-qtquick2-accessible.html - Attached property to make components accessible
• "AnimatedSprite":http://doc.qt.io/qt-5.0/qml-qtquick2-animatedsprite.html - The AnimatedSprite element draws a sprite animation
• "Sprite":http://doc.qt.io/qt-5.0/qml-qtquick2-sprite.html - The Sprite element represents a sprite animation
• "SpriteSequence":http://doc.qt.io/qt-5.0/qml-qtquick2-spritesequence.html - The SpriteSequence element draws a sprite animation
• "DragEvent":http://doc.qt.io/qt-5.0/qml-qtquick2-dragevent.html - The DragEvent object provides information about a drag event.
• "DropArea":http://doc.qt.io/qt-5.0/qml-qtquick2-droparea.html - The DropArea item provides drag and drop handling.

QML element not available in QtQuick 2 anymore: