[Interest] Replacing QScript with QML

Wed Feb 15 19:55:33 CET 2017

You could create a singelton Factory that will create the objects into
javascripts and wrap the whole creation into a simple functions, you can
also make a map from object name to the actual Qml Component. Just make
sure you give the object the proper parenting and ownership and delete them
properly.

// MyFactorySingelton.qml
pragma Singleton
import QtQuick 2.3

QmlObject
{
id: component
readonly property int objUno: 0
readonly property int objTwo: 1

readonly property var objType:
[
 'objUno'
, 'objTwo'
]
readonly property var objComponent: component.revaluate.concat(
[
 Qt.createComponent('ObjectUno.qml', Component.PreferSynchronous, component)
, Qt.createComponent('ObjectTwo.qml', Component.PreferSynchronous,
component)
])
function createByName(name, parent, initMap) // ex: createByName('objUno',
myParent, { 'width': 500, 'height': 200 })
{
return createById(component[component.objType[name]], parent, initMap);
}
function createById(obj_index, parent, initMap) // ex: create(1, myParent,
{ 'width': 500, 'height': 200 })
{
return objComponent[obj_index].create(parent, );
}
function create(comp, parent, initMap)
{
return comp.createObject(parent, initMap);
}
}

you can use it into your javascript
*.import MyFactoryModule 0.1 as MyFactory*

or qml script easily after that
*import MyFactoryModule 0.1 *
*MyFactorySingelton.createByName('objUno')*

If you are looking at only kicking some script, Component.onCompleted or
use the WorkerScript to kick javascript only scripting:
http://doc.qt.io/qt-5/qml-workerscript.html

[image: bodycad] <https://www.bodycad.com/>
Jerome Godbout
Software Developer
2035 rue du Haut-Bord, Québec, QC, Canada. G1N 4R7
T:  +1 418 527-1388
E: jerome at bodycad.com
www.bodycad.com

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On Wed, Feb 15, 2017 at 1:30 PM, Ian Geiser <geiseri at geekcentral.pub> wrote:

>  ---- On Tue, 14 Feb 2017 11:06:36 -0500 Jason H <jhihn at gmx.com> wrote
> ----
>  >
>  >
>  > > Sent: Tuesday, February 14, 2017 at 10:14 AM
>  > > From: "Ian Geiser" <geiseri at geekcentral.pub>
>  > > To: Interest at qt-project.org
>  > > Subject: [Interest] Replacing QScript with QML
>  > >
>  > >
>  > >
>  > >
>  > > Greetings, I am ported a non-gui Qt4 QScript apt to Qt5 and would
> like to replace the QScript component with QML.  I am struggling with quite
> a few rudimentary things though.
>  > >
>  > > My biggest problem is custom Javascript types:  I made everything a
> QObject based class, but allocating these objects in javascript is messy.
> Is there a way to get close to something as simple as "var foo = new Foo()"?
>  > >
>  > > Has anyone done this before?  Are there any examples?  Maybe I am
> putting a square peg into a round hole here.  Any insight from the Qt guys
> here?
>  >
>  > https://wiki.qt.io/QML_Dynamic_Objects ?
>  >
>
> That is what I am wanting to avoid.  I have about 15 c++ types that are
> used to control the underlying system.  The biggest one is  a simple
> wrapper around QProcess.  So i have a plugin that wraps it and define it
> like so:
>
> ===
>     m_engine = new QQmlEngine(this);
>     addGlobalProperty("ScriptEngine", this);
>
>     qmlRegisterType<Process>("org.geekcentral.api", 1, 0, "Process");
>
>    QQmlComponent *component = new QQmlComponent(m_engine);
>    component->loadUrl("myscript.qml);
>
>    Object *scriptInstance = component->create(m_engine->rootContext());
> ===
>
> Now what I really want to be able to do is something like this in the QML:
>
> ===
> import QtQuick 2.0
> import org.geekcentral.api 1.0
>
>
> QtObject {
>     id: plugin
>     Component.onCompleted: {
>        console.log("Loaded");
>        var process = new Process(this);
>        // ... set up process
>        process.run();
>     }
> }
> ===
>
> Like you said I end up with the Qt.createQmlObject(...) code, but this is
> messy and cumbersome to do with all my types.
>
>
> The only other approach I found was like below:
>
> ===
> import QtQuick 2.0
> import org.geekcentral.api 1.0
>
>
> QtObject {
>     id: plugin
>     property Process process: Process {
>        Component.onCompleted: run()
>    }
>
>     Component.onCompleted: {
>        console.log("Loaded");
>     }
> }
> ===
>
> It seems a bit more verbose, so I am wondering if there is a better way to
> actually pull this off.
>
> Thanks!
>
>
> _______________________________________________
> Interest mailing list
> Interest at qt-project.org
> http://lists.qt-project.org/mailman/listinfo/interest
>
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