Qt wiki will be updated on October 12th 2023 starting at 11:30 AM (EEST) and the maintenance will last around 2-3 hours. During the maintenance the site will be unavailable.

Qt for Python UsingQtProperties

From Qt Wiki
Revision as of 03:32, 5 June 2016 by AutoSpider (talk | contribs) (Rename category "LanguageBindings::PySide" -> "PySide")
Jump to navigation Jump to search


English 한국어


PySide provides a Property function which allows for declaring properties that simultaneously behave both as Qt and Python properties, and have their setters and getters defined as Python functions.

A short example illustrating defining and accessing a Qt property from Python is given below:

from PySide.QtCore import QObject, Property

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)

obj = MyObject()
obj.pp = 47
print (obj.pp)

The complete specification for PySide's property system is given in PSEP 103.

Properties in QML expressions

If you are using properties of your objects in QML expressions, QML requires the property to be NOTIFYable. This can be done using a simple signal:

class Person(QtCore.QObject):
 def ''init''(self, name):
 QtCore.QObject.''init''(self)
 self._person_name = name

def _name(self):
 return self._person_name

@QtCore.Signal
 def name_changed(self): pass

name = QtCore.Property(unicode, _name, notify=name_changed)