Re: Error closing dialog after editing grid

Yes. Clearing links solves the problem that occurs when closing a dialog. 
But it creates other problems when re-editing a cell.

class StatePanel(wx.Panel):

    def __init__(self, parent, states):
        ...
        self.grid = CustomGrid(self, size=(-1, 100))
        self.grid.Bind(wx.EVT_WINDOW_DESTROY, self.OnGridDestroy)
        ...    

    def OnGridDestroy(self, event):
        # self.table._updateColAttrs(self.grid)
        for row in range(self.table.GetNumberRows()):
            for col in range(self.table.GetNumberCols()):
                editor = self.grid.GetCellEditor(row, col)
                renderer = self.grid.GetCellRenderer(row, col)
                print(f'Ref[{row}; {col}] = {editor.RefCount}; '
                      f'{renderer.RefCount}')
                while editor.RefCount != 1:
                    editor.DecRef()
                    renderer.DecRef()
        print('-----------------------------------------')
        event.Skip()

Traceback (most recent call last):
  File "D:\project\designer\widgets\StatePanel.py", line 238, in 
OnGridDestroy
    editor = self.grid.GetCellEditor(row, col)
wx._core.wxAssertionError: C++ assertion "firstHandler != this" failed at 
..\..\src\common\wincmn.cpp(1461) in wxWindowBase::PopEventHandler(): 
cannot pop the wxWindow itself

The only solution that helps is to assign a new editor for each cell before 
destroying the grid.

среда, 6 ноября 2019 г., 19:44:16 UTC+3 пользователь Robin Dunn написал:
>
> On Wednesday, November 6, 2019 at 12:13:47 AM UTC-8, ioprst wrote:
>>
>> The program ends with an error
>>
>> Exception ignored in: 'garbage collection'
>> wx._core.wxAssertionError: C++ assertion "firstHandler != this" failed at 
>> ..\..\src\common\wincmn.cpp(1461) in wxWindowBase::PopEventHandler(): 
>> cannot pop the wxWindow itself
>> Fatal Python error: unexpected exception during garbage collection
>>
>
> Does this help? (Especially the 4th bullet point.)
>
>
> https://discuss.wxpython.org/t/howto-deal-with-reference-counts-in-grid-classes/34126
>  
>
> --
> Robin
>
>

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