Public Functions qt++ to qml

[Dante Leoncini]

I 'm trying to get values ​​of public functions
for example. I want to know the number of screens connected with "screenCount ()"

if (1 == screenCount()){celular.show();};

or if I want the position of the mouse in QML
viewer.rootContext()->setContextProperty("anchoSalida", QMouseEvent->globalX());

all these examples fail. as it should really be written ?

[raven-worx]

@Dante-Leoncini

you mean something like the following?

class MyFunctionsProvider : QObject
{
    Q_OBJECT

public:
     MyFunctionsProvider ( QObject* parent = 0 ) : QObject(parent)
     {
     }

     Q_INVOKABLE int GetScreenCount() const
     {
             QList<QScreen *> screens = QGuiApplication::screens();
            return screen.count();
     }

     Q_INVOKABLE QPoint GlobalCursorPos() const
     {
            return QCursor::pos();
     }
};

...

viewer.rootContext()->setContextProperty("MyFunctions", new MyFunctionsProvider(viewer.rootContext()) );

In QML you can do then:

MyFunctions.GetScreenCount()
MyFunctions.GlobalCursorPos()

[Dante Leoncini]

@raven-worx

thanks for the reply. For the width and height of the screen to solve it so:

viewer.rootContext()->setContextProperty("altoSalida", WidgetEscritorio->screenGeometry(1).height());
    viewer.rootContext()->setContextProperty("anchoSalida", WidgetEscritorio->screenGeometry(1).width());

but when I wanted to do the same with the position of the mouse did not work .
Try to use your code to get the coordinates :

class MyFunctionsProvider : QObject
{
    Q_OBJECT

public:
     MyFunctionsProvider ( QObject* parent = 0 ) : QObject(parent)
     {
     }

     Q_INVOKABLE QPoint GlobalCursorPos() const
     {
            return QCursor::pos();
     }
};

viewer.rootContext()->setContextProperty("MyFunctions", new MyFunctionsProvider(viewer.rootContext()));

But when I try to compile get the error: 'QObject' is an inaccessible base of 'MyFunctionsProvider'

I 'm looking for because it is. I lack even practiced in qt c ++
(translated with google)

edit:
missing the word "public" in class MyFunctionsProvider : public QObject
but now comes another error: undefined reference to `vtable for MyFunctionsProvider'

[raven-worx]

@Dante-Leoncini said in Public Functions qt++ to qml:

missing the word "public" in class MyFunctionsProvider : public QObject

yes, i missed hat.

but now comes another error: undefined reference to `vtable for MyFunctionsProvider'

strange. Is the code you've posted really all you are using? Or did you stip something out?
Try a clean rebuilt maybe.

[Naahmi]

@Dante-Leoncini said in Public Functions qt++ to qml:

but now comes another error: undefined reference to `vtable for MyFunctionsProvider'

Hi,
you need to run qmake.