[FIXED] What type conversions exist in PySide/PyQt?

Issue

Slot, Signal, Property, etc. take a type. For instance, the sample code shows:

class MyObject(QObject):                                                                            

    def __init__(self,startval=42):                                                                 
        QObject.__init__(self)                                                                      
        self.ppval = startval                                                                       
                                                                                                   
    def readPP(self):                                                                                   
        return self.ppval                                                                               
                                                                                                    
    def setPP(self,val):                                                                                
        self.ppval = val                                                                                
                                                           
    pp = Property(int, readPP, setPP)  # <--- Look at the first argument

The Property expects an 'int'.

What types are possible? I can find no documentation.

In my time working with Qt, I have gleaned the following through osmosis:

• int
• float
• bool
• str
• list
• 'QVariant'
• 'QJsonObject`

Are these the only types available? Are they actually documented somewhere?

Solution

In general it supports any data type.

The problem is that if QML supports it, and in that case there are only some basic types that PySide/PyQt can interpret and convert them to QML objects. Unfortunately there is no documentation about it (maybe reporting it as a bug would be good for them to implement it).

Besides the ones you indicate you can also use:

• "QVariantList"

• QObject: this type must also be exported when you expose models or classes derived from QObject.

• QColor

• QUrl

• QDateTime

• QFont

• QPoint, QPointF

• QRect, QRectF

• QSize, QSizeF

In theory PySide/PyQt can support at most the types that Qt/C++ supports and in that case if there is documentation about it: Basic Qt Data Types.

Any other type of python data that is not in that list will be encapsulated in a QVariant since it does support PyObject but it will be unusable since it cannot be manipulated in QML.

Answered By - eyllanesc