Qt Script add method

[bunjee]

Hey there,

Here is a bit advanced question,

I'm using the following routine to enable my QtScript to new a QLineEdit:

Q_SCRIPT_DECLARE_QMETAOBJECT(QLineEdit, QWidget*)
 
 ...
 
 QScriptValue lineEditClass = engine.scriptValueFromQMetaObject<QLineEdit>();
 engine.globalObject().setProperty("QLineEdit", lineEditClass);

Q_SCRIPT_DECLARE_QMETAOBJECT(QLineEdit, QWidget*)

 ...

 QScriptValue lineEditClass = engine.scriptValueFromQMetaObject<QLineEdit>();
 engine.globalObject().setProperty("QLineEdit", lineEditClass);

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Now I want to make one of this QLineEdit's member (not a slot, not a property) available in the script:

example: "void QLineEdit::deselect ()"

and in the script

lineEdit = new QLineEdit;
lineEdit.deselect();

lineEdit = new QLineEdit;
lineEdit.deselect();

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What's the most simple way to achieve that.

Thanks.

[wysota]

Either add a function to the prototype of the QLineEdit class (in QScript) that will call deselect on the real object or subclass QLineEdit and use the Q_INVOKABLE macro.

[bunjee]

Thanks Wysota,

The best solution is using "setDefaultPrototype" so it applies to every inheriting objects.

Here is the implementation.

(Courtesy of Kent himself from Trolltech).

#include <QtScript>
#include <QtGui>
 
static QScriptValue QWidget_prototype_move(QScriptContext *ctx, QScriptEngine *eng)
{
    QWidget *widget = qscriptvalue_cast<QWidget*>(ctx->thisObject());
    Q_ASSERT(widget != 0);
    widget->move(ctx->argument(0).toInt32(), ctx->argument(1).toInt32());
    return eng->undefinedValue();
}
 
int main(int argc, char **argv)
{
    QApplication app(argc, argv);
 
    QScriptEngine eng;
    QScriptValue widgetProto = eng.newObject();
    widgetProto.setProperty("move", eng.newFunction(QWidget_prototype_move));
    eng.setDefaultPrototype(qMetaTypeId<QWidget*>(), widgetProto);
 
    QMainWindow win;
    win.resize(400, 400);
    QScriptValue scriptWindow = eng.newQObject(&win);
    scriptWindow.property("move").call(scriptWindow, QScriptValueList() << 100 << 200);
 
    win.show();
    return app.exec();
}

#include <QtScript>
#include <QtGui>

static QScriptValue QWidget_prototype_move(QScriptContext *ctx, QScriptEngine *eng)
{
    QWidget *widget = qscriptvalue_cast<QWidget*>(ctx->thisObject());
    Q_ASSERT(widget != 0);
    widget->move(ctx->argument(0).toInt32(), ctx->argument(1).toInt32());
    return eng->undefinedValue();
}

int main(int argc, char **argv)
{
    QApplication app(argc, argv);

    QScriptEngine eng;
    QScriptValue widgetProto = eng.newObject();
    widgetProto.setProperty("move", eng.newFunction(QWidget_prototype_move));
    eng.setDefaultPrototype(qMetaTypeId<QWidget*>(), widgetProto);

    QMainWindow win;
    win.resize(400, 400);
    QScriptValue scriptWindow = eng.newQObject(&win);
    scriptWindow.property("move").call(scriptWindow, QScriptValueList() << 100 << 200);

    win.show();
    return app.exec();
}

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[mpantoli]

Hi all,
In my project, I need to espose to the script, the move slot(normaly privated) of all widgets that I use.
I've implemented a solution that use QUiLoad to load a ui created by QtDesigner and everything works well, but I need to move some widgets at run-time inside the Script.
I think that the best solution is to use the "setDefaultPrototype" when I create widgets(by QUiLoad), but since now I don't find the right way...

If someone has a peace of code as example .....

Thanks
mpantoli

[wysota]

I think you rather need to expose the top level widgets and access all the other widgets through the parent-child relationship. If the latter is not possible, traverse the widget tree and expose each of them separately.