[PyQt] QDirModel instance

[Scott Frankel]

Right.  Thanks for pointing out that I still need to explicitly pass  
"self."

I'm still not getting checkboxes displayed in the tree widget,  
though.  I believe the problem is in the nested return value in the  
model's data() method.

The C++ example code I'm following uses a QMap data structure to hold  
checkState values.  After reading Assistant notes, a python  
dir(QtCore), and some googling, I've found that QMap is not  
implemented in PyQt.  So I'm using a Dict instead.  Still, my app  
complains:

	TypeError: invalid result type from DirModel.data()


Here's the C++ code I'm following:

     virtual QVariant data(const QModelIndex &index, int role =  
Qt::DisplayRole) const
     {
         if (role == Qt::CheckStateRole && index.column() == 0) {
             return  
checkstates.value(fileInfo(index).absoluteFilePath(), Qt::Unchecked);
         }
         return QDirModel::data(index, role);
     }

private:
     QMap<QString, Qt::CheckState> checkstates;
};




Here's my code:

class DirModel(QtGui.QDirModel):
	def __init__(self, parent=None):
		QtGui.QDirModel.__init__(self, parent)

		self.checkstates = {}

	def data(self, index, role=QtCore.Qt.DisplayRole):
		if (role == QtCore.Qt.CheckStateRole and index.column() == 0):
			self.checkstates[self.fileInfo(index).absoluteFilePath()] =  
QtCore.Qt.Checked
			return self.checkstates[self.fileInfo(index).absoluteFilePath()]     
# <-- problem???
		
		return QtGui.QDirModel.data(self, index, role)



Thanks in advance for your suggestions!
Scott




On Jul 9, 2008, at 11:36 PM, Phil Thompson wrote:

> On Wed, 9 Jul 2008 22:39:27 -0700, Scott Frankel <frankel at circlesfx.com 
> >
> wrote:
>>
>> Hello,
>>
>> I just joined this list and am new to PyQt (and Qt).  I've scanned  
>> the
>> archives, but I'm not sure even what I'm looking for to answer my
>> question.
>>
>> I'm looking over some C++ code, trying to rewrite it in Python.  (My
>> Spanish is much better than my C++!)  I'm sub-classing and extending
>> QDirModel and getting the following error:
>>
>> 	TypeError: first argument of unbound method QDirModel.data() must be
>> a QDirModel instance
>>
>> The C++ methods are:
>>
>>     virtual QVariant data(const QModelIndex &index, int role =
>> Qt::DisplayRole) const
>>     {
>>         if (role == Qt::CheckStateRole && index.column() == 0) {
>>             return
>> checkstates.value(fileInfo(index).absoluteFilePath(), Qt::Unchecked);
>>         }
>>         return QDirModel::data(index, role);
>>     }
>>
>>
>> My translation so far looks like this:
>>
>>
>> [ ... ]
>> class DirModel(QtGui.QDirModel):
>> 	def data(self, index, role=QtCore.Qt.DisplayRole):
>> 		if (role == QtCore.Qt.CheckStateRole and index.column() == 0):
>> 			return checkstates.value(fileInfo(index).absoluteFilePath(),
>> QtCore.Qt.Unchecked)
>> 		return QtGui.QDirModel.data(index, role)
>> [ ... ]
>>
>>
>> Not sure how to make the first argument (index or self?) be a
>> QDirModel instance.  Ultimately I'm hoping for a directory tree with
>> check boxes.
>>
>> Suggestions?
>
> When using an unbound method (including __init__()) you must  
> explicitly
> pass self. So...
>
>    return QtGui.QDirModel.data(self, index, role)
>
> Phil
>
>

Scott Frankel
President/VFX Supervisor
Circle-S Studios
510-339-7477 (o)
510-332-2990 (c)




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