QML1-vs-QML2
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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:
- The change in javascript engines.
- What's changed in the js syntax in QML2 (if any)
- C++ api changes - like how does we create items these days? How is it different from QML1
- 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
See also the Qt documentation's porting guide
A description, how to port your Qt 4.x application to Qt 5 is here
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 - Provides a 2D canvas element
- CanvasGradient - Context2D opaque CanvasGradient interface
- Context2D - The Context2D API allows you to draw 2d graphic shapes on the Canvas item.
- TextMetrics - Context2D TextMetrics interface
- MultiPointTouchArea - Enables handling of multiple touch points
- TouchPoint - The TouchPoint element describes a touch point in a MultiPointTouchArea
- PathAnimation - Animates position along a path
- PathInterpolator - Allows manual animation along a path
- AnimationController - Allows manual control of animation progress
- PathArc - Defines an arc in a Path
- PathCurve - Defines a point on a Catmull-Rom curve in a Path
- PathSvg - Defines a sub-path specified as a SVG path data string in a Path
- Accessible - Attached property to make components accessible
- AnimatedSprite - The AnimatedSprite element draws a sprite animation
- Sprite - The Sprite element represents a sprite animation
- SpriteSequence - The SpriteSequence element draws a sprite animation
- DragEvent - The DragEvent object provides information about a drag event.
- DropArea - The DropArea item provides drag and drop handling.
QML element not available in QtQuick 2 anymore: