storing "data" in DataViewListCtrl

wxPython Users
1

I need to reference an integer id to the rows in a DataViewListCtrl. The AppendItem() method seems to allow the storing of ClientData with the row:

   AppendItem (const wxVector< wxVariant > &values, wxClientData *data=NULL)

So once a row is selected how do I get the wxClientData for the selected row so I can reference back to the actual db record it came from? I'm not seeing a method to do that.

Or am I barking up the wrong tree?

Thanks,
Michael

2

Passing client data to that method probably won't work right as it is taking a sequence of values, and so the C++ method is probably expecting a matching C array of data values if it is not NULL. However the wxClientData typemap in wxPython is only going to be able to deal with one data object there.

However you should be able to use SetItemData and GetItemData instead. They are methods that wxPython adds on to the class, their C++ prototypes look like this:

         PyObject* GetItemData(unsigned int row);
         void SetItemData(unsigned int row, PyObject* data);

···

On 2/24/12 9:19 AM, Michael Hipp wrote:

I need to reference an integer id to the rows in a DataViewListCtrl. The
AppendItem() method seems to allow the storing of ClientData with the row:

AppendItem (const wxVector< wxVariant > &values, wxClientData *data=NULL)

So once a row is selected how do I get the wxClientData for the selected
row so I can reference back to the actual db record it came from? I'm
not seeing a method to do that.

Or am I barking up the wrong tree?

--
Robin Dunn
Software Craftsman

3

Thanks, that should work.

But I wonder why AppendItem() doesn't return the row that was added. Seems it would be natural to do:

for key,val in dic.items():
    row = ctrl.AppendItem(val)
    ctrl.SetItemData(row, key)

Otherwise it appears I'll have to maintain a counter as I loop thru my data items and my code will look suspiciously like FORTRAN.

Is there a better way I'm missing?

Thanks,
Michael

···

On 2012-02-24 1:02 PM, Robin Dunn wrote:

However you should be able to use SetItemData and GetItemData instead. They are
methods that wxPython adds on to the class, their C++ prototypes look like this:

PyObject* GetItemData(unsigned int row);
void SetItemData(unsigned int row, PyObject* data);

4

I need to correct my earlier statement about AppendItem and friends, apparently I didn't put my brain in gear when I glanced at the code...

     void AppendItem( const wxVariantVector &values, wxClientData *data = NULL );

While that does expect to get a sequence of items for the first parameter, it is not for multiple rows as I mentioned before, but rather for each of the items in a single row. Consequently the data value if provided should be just a single object and will be associated with that row.

However you should be able to use SetItemData and GetItemData instead.
They are
methods that wxPython adds on to the class, their C++ prototypes look
like this:

PyObject* GetItemData(unsigned int row);
void SetItemData(unsigned int row, PyObject* data);

And you can still use GetItemData to fetch it later, or SetItemData to change the data value.

Thanks, that should work.

But I wonder why AppendItem() doesn't return the row that was added.
Seems it would be natural to do:

for key,val in dic.items():
row = ctrl.AppendItem(val)
ctrl.SetItemData(row, key)

Otherwise it appears I'll have to maintain a counter as I loop thru my
data items and my code will look suspiciously like FORTRAN.

Is there a better way I'm missing?

Well, you know that if you've just appended an item then its row number will be one less than the number of items in the data store, so something like this would work:

  row = self.GetStore().GetCount()

···

On 2/24/12 11:12 AM, Michael Hipp wrote:

On 2012-02-24 1:02 PM, Robin Dunn wrote:

--
Robin Dunn
Software Craftsman

5

This seems to be working very well and is plenty pythonic.

Thanks,
Michael

···

On 2012-02-24 7:08 PM, Robin Dunn wrote:

I need to correct my earlier statement about AppendItem and friends, apparently
I didn't put my brain in gear when I glanced at the code...

void AppendItem( const wxVariantVector &values, wxClientData *data = NULL );

And you can still use GetItemData to fetch it later, or SetItemData to change
the data value.