Crashed from DataViewCtrl.SetSelections

wxPython Users
#1

debug.py (6.3 KB)
Hi all,
I have two DataViewCtrl work fine with PyDataViewModel. (in wxpython 4.0.6)
What I want to do is moving some items from one control to another and then select them.
As the codes below, however, the call of self.dvc2.SetSelections(to_select) always make my program crashed.
Is it correct to use DataViewItemArray like this way? Any help would be much appreciated.

    def on_btn_auto_classify(self, event):
        mod1 = self.mod1
        mod2 = self.mod2
        
        to_select = dv.DataViewItemArray()
        undecided_grp = mod1.data['undecided']
        for obj in list(undecided_grp.children):
            undecided_grp.children.remove(obj)
            rand_grp = mod2.data[f'group{random.randint(1, 3)}']
            rand_grp.add_child(obj)
            
            to_select.append(mod2.ObjectToItem(obj))
                
        mod1.Cleared()
        mod2.Cleared()
        self.dvc2.SetFocus()
        self.dvc2.UnselectAll()
        #self.dvc2.SetSelections(to_select) # crashed
#2

The problem is your implementation of GetParent of the Model class. It should return like

return self.ObjectToItem(group)

instead of

return self.ObjectToItem(obj)

Christian

#3

Thanks ckkart,
You are right, the crashed problem is solved with the updated code: debug.py (6.3 KB)
However, another problem arises, the result of selection seems to be a mess.
result
I suspect if it is safe to call the function ObjectToItem() in my button handler, because the description in document seems to create ‘new’ DataViewItem:

ObjectToItem : Create a DataViewItem for the object, and remember the ID-.obj mapping.

But i cannot figure out other way to retrieve these DataViewItems and pass them to SetSelections().

#4

It works fine here. Are you sure you haven’t changed anything else?

Screen Shot 2020-05-27 at 09.08.10

#5

Yes, i used the code i uploaded above without any change (in win10, wxpython 4.0.6, python 3.6.4)
I ran it many times to see the results. Although the selection is correct once or twice, most times it give me the wrong outcome.

#6

I observed several improvements/bug fixes with wxpython4.1 compared to 4.0 which are basically due to fixes in wxwidgets. Have you tried 4.1?

#7

Hi ckkart,
It is so nice to hear about that.
I tested it today, and it works perfectly only after updating to wxpython 4.1.0.
All problems have been solved, I really appreciate your kindly effort and notice.