Create a global object

yan_

Hi would like create a Global object to expose function.

And is it possible to add it in a plugin?

thanks

[edit: fixed typos / $chetankjain ]

ivan

If I understood you correctly, you can create a class with a static accessor. Something like:

@class Global {
static Global * self();

private:
Global();
static Global * instance;

};@

As for the plugin, you can just modify the accessor to get the object from the plugin.

yan_

I want make a global object like Qt Object to expose functions :
"http://doc.trolltech.com/main-snapshot/qml-qt.html":http://doc.trolltech.com/main-snapshot/qml-qt.html

Or something like
@import "file.js" as myObject@

And this global Object is added with import of my QML plugin. This object could be coded in C++ or JS

[edit: fixed hyperlink / $chetankjain ]

ivan

Sorry, didn't realize you are talking about scripting. Haven't played with QML that much, bit if things are inherited from the QtScript module, it should go something like this:

@engine.globalObject().setProperty("myObject", engine.newQObject(object));@

After that, your object will be available to qtscript.

As for making it pluggable with both c++ and js, I can't really help. (I could think of a dirty way to achieve it, but IMO it is better to wait for our friendly Trolls to tell us the proper way)

yan_

Thanks.

They do it in Qt Declarative code (QDeclarativeScriptEngine constructor in QDeclarativeEngine code)

I've an access to QDeclarativeEngine which use a QScriptEngine (internaly) on plugin init function.
But i don't find how to access to a QScriptEngine.

mbrasser

You could try using setContextProperty() on the root context of the engine -- this will effectively add the object as a context property that is available to all the elements in the engine. From a plugin, you can do so inside the "initializeEngine()":http://doc.trolltech.com/main-snapshot/qdeclarativeextensionplugin.html#initializeEngine function.

I believe there are plans to look at this more for a future release, so plugins can easily add "namespaces" like the Qt object with functions, enum values, etc.

yan_

With this method, how create QScriptValue with newXXXX function ?
"http://doc.qt.nokia.com/4.7-snapshot/qscriptengine.html":http://doc.qt.nokia.com/4.7-snapshot/qscriptengine.html

Another solution that i will test, it's create a component with QDeclarativeComponent
"http://doc.qt.nokia.com/4.7-snapshot/qdeclarativecomponent.html":http://doc.qt.nokia.com/4.7-snapshot/qdeclarativecomponent.html

Make @import "file.js" as myObject@ equivalent in qmldir file could be interesting.

[edit: fixed hyperlink / $chetakjain ]

? This user is from outside of this forum

hi yan, you could also use the link feature for hyperlinks

yan_

[quote author="chetankjain" date="1283761818"]hi yan, you could also use the link feature for hyperlinks[/quote]
Sorry. I don't see this forum don't make auto-linked.

? This user is from outside of this forum

yan wrote:

bq. Sorry. I don’t see this forum don’t make auto-linked.

That I believe is in the roadmap ... :)

mbrasser

[quote author="yan_" date="1283758523"]With this method, how create QScriptValue with newXXXX function ?[/quote]

With the setContextProperty() approach, you would use a QObject with slots or Q_INVOKABLEs for your "global" object, rather than a QScriptValue. The Minehunt demo shows this approach (adds a MinehuntGame object in the root context).

yan_

[quote author="mbrasser" date="1283814387"]With the setContextProperty() approach, you would use a QObject with slots or Q_INVOKABLEs for your "global" object, rather than a QScriptValue. The Minehunt demo shows this approach (adds a MinehuntGame object in the root context).[/quote]
Thanks.
I've ever test it and it's work perfectly ^^

I find a solution for JS code :D
1- create a qml file wich define function on the root element (I use QtObject)
2- in initializeEngine(), use a"QDeclarativeComponent ":http://doc.qt.nokia.com/4.7-snapshot/qdeclarativecomponent.html.
3- set qml file path or use setData
4- use create to make a QObject
5- add this QObject with setContextProperty

Like QDeclarativeComponent use qml file, i think it's so possible to mix JS and C++ code

johnlamericain

It's really impressive, thanks for that !