View source for QML1-vs-QML2

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[[Category:QtEcosystemTeamTasklist]]

= 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.

{| class="wikitable"
! 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 [http://doc.qt.io/qt-5.0/qtquick2-whatsnew.html What's New in Qt Quick 2]

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

A description, how to port your Qt 4.x application to Qt 5 is [http://wiki.qt.io/Transition_from_Qt_4.x_to_Qt5 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
* [http://doc.qt.io/qt-5.0/qml-qtquick2-canvas.html Canvas] - Provides a 2D canvas element
* [http://doc.qt.io/qt-5.0/qml-qtquick2-qtquick2-canvasgradient.html CanvasGradient] - Context2D opaque CanvasGradient interface
* [http://doc.qt.io/qt-5.0/qml-qtquick2-context2d.html Context2D] - The Context2D API allows you to draw 2d graphic shapes on the Canvas item.
* [http://doc.qt.io/qt-5.0/qml-qtquick2-qtquick2-textmetrics.html TextMetrics] - Context2D TextMetrics interface
* [http://doc.qt.io/qt-5.0/qml-qtquick2-multipointtoucharea.html MultiPointTouchArea] - Enables handling of multiple touch points
* [http://doc.qt.io/qt-5.0/qml-qtquick2-touchpoint.html TouchPoint] - The TouchPoint element describes a touch point in a MultiPointTouchArea
* [http://doc.qt.io/qt-5.0/qml-qtquick2-pathanimation.html PathAnimation] - Animates position along a path
* [http://doc.qt.io/qt-5.0/qml-qtquick2-pathinterpolator.html PathInterpolator] - Allows manual animation along a path
* [http://doc.qt.io/qt-5.0/qml-qtquick2-animationcontroller.html AnimationController] - Allows manual control of animation progress
* [http://doc.qt.io/qt-5.0/qml-qtquick2-patharc.html PathArc] - Defines an arc in a Path
* [http://doc.qt.io/qt-5.0/qml-qtquick2-pathcurve.html PathCurve] - Defines a point on a Catmull-Rom curve in a Path
* [http://doc.qt.io/qt-5.0/qml-qtquick2-pathsvg.html PathSvg] - Defines a sub-path specified as a SVG path data string in a Path
* [http://doc.qt.io/qt-5.0/qml-qtquick2-accessible.html Accessible] - Attached property to make components accessible
* [http://doc.qt.io/qt-5.0/qml-qtquick2-animatedsprite.html AnimatedSprite] - The AnimatedSprite element draws a sprite animation
* [http://doc.qt.io/qt-5.0/qml-qtquick2-sprite.html Sprite] - The Sprite element represents a sprite animation
* [http://doc.qt.io/qt-5.0/qml-qtquick2-spritesequence.html SpriteSequence] - The SpriteSequence element draws a sprite animation
* [http://doc.qt.io/qt-5.0/qml-qtquick2-dragevent.html DragEvent] - The DragEvent object provides information about a drag event.
* [http://doc.qt.io/qt-5.0/qml-qtquick2-droparea.html DropArea] - The DropArea item provides drag and drop handling.

QML element not available in QtQuick 2 anymore: