As a workaround you can use QQmlContext::setContextObject: QQmlEngine::rootContext()->setContextObject(myMath);
On Tue, Feb 23, 2016 at 2:11 PM, Stephen Bryant <st...@bawue.de> wrote: > Hi Stefan, > > On Tuesday 23 February 2016 05:34:03 Walter Stefan wrote: > [...] >> >> And in this way. I can use it then in the script: >> value = sqrt(4); >> >> I actually don't want to map a whole QObject, because that would require a >> call like this: value = MyMath.sqrt(4); >> >> Is there any way to achive in QJSEngine the same result as I do within the >> QScriptEngine? > > > Is far as I know, the only way is to do the thing you don't want to: map the > whole QObject. You can, however, add a JS function reference inside the > engine so you can call the function without the object name. > > QJSEngine engine; > engine.globalObject().setProperty( > "MyMath", > engine.newQObject( new ScriptModuleMath( &engine ) ) > ); > engine.evaluate( "var sqrt=MyMath.sqrt;" ); // repeat for other functions > > This will now work in JS: value = sqrt(4); > > You'll presumably be aware that all public slots of MyMath will automatically > be available as JS functions. That makes things a little easier. > > It seems that you also need a QObject instance, event if you only want to > expose static methods. > > BTW: your C++ native function can use this signature: double sqrt(double); > You'll get NaN if somebody calls it with a non-number. The return value is > also automatically converted as there is a QJSValue constructor that takes a > double. > > > There's no direct equivalent of read-only/undeletable, unfortunately. I'm > missing that too. The closest you can get is that your MyMath functions can't > be altered from JS, and you can also make a read-only Q_PROPERTY. > > However, there is nothing stopping somebody from reassigning properties of the > global object - so your 'sqrt' function and 'MyMath' object could be replaced. > This may be a security concern, depending on what you're doing. > > > Best regards, > > Steve > _______________________________________________ > Interest mailing list > Interest@qt-project.org > http://lists.qt-project.org/mailman/listinfo/interest _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
