While diving deep into TreeView/Model concept here is what I "understand" so far...
First I subclass MyTreeView() class where I extend a QTreeView build-in by assigning it to MyOwnAbstractItemModel() model (subclassing in a next step):
class myTreeView(QTreeView):
def __init__(self, parent=None):
super(myTreeView, self).__init__(parent)
self.myOwnAbstractModel = MyOwnAbstractItemModel()
self.setModel(self.myOwnAbstractModel)
I continue with subclassing/describing MyOwnAbstractItemModel(). It uses a built-in QAbstractItemModel() class as a "template" to start with...
class MyOwnAbstractItemModel(QAbstractItemModel):
def __init__(self, parent=None):
super(MyOwnAbstractItemModel, self).__init__(parent)
From what I understand there are some MyOwnAbstractItemModel() methods that must be declared for MODEL to work. I wonder where could I get a complete list of those method() names and their syntax description?
I looked at the code examples posted online. It appears those pre-defined methods have a specific syntax already pre-defined... such as number of incoming arguments and what type of arguments is expected... for example the method below dosen't get any incoming arguments (not clear what a purpose of it):
def mimeTypes(self):
#print '\n mimeTypes(self)'
types = QStringList()
types.append('application/x-ets-qt4-instance')
return types
But this method:
def dropMimeData(self, mimedata, action, row, column, parentIndex):
parentNode = self.nodeFromIndex(parentIndex)
takes four arguments. Please advice! Many thanks in advance.
If you download the source code for PyQt, you will find a model-testing module in the contrib/pymodeltest directory. This module provides a way to check for the common errors found in custom model implementations. You may find it useful to look through the code in this module, as it has a lot of helpful comments that explain the purpose of many of the tests it performs.
Also, you should read through the Model/View Programming overview in the Qt Docs - in particular the Model Subclassing reference.