Hello,
I have a large grid (~9400 rows x 14 columns), filled using a wx.grid.GridTableBase
After the table has been filled I perform an AutoSizeColumn on all columns:
[self.grid.AutoSizeColumn(col) for col in range(self.grid.GetNumberCols())]
The issue is that specific operation takes 26 seconds (profiled with cProfile), which is unacceptable for my app’.
Are there alternative ways of doing this autosizing that would take much lower time (< 1 sec) ?
AutoSizeColumn creates a renderer for each and every cell to compute renderer->GetBestWidth, which may involve creating a DC to measure text. Not unsurprising that it’s slow.
Now, you could reimplement the relevant parts of wxGrid::AutoSizeColOrRow in Python, skipping cell values that you deem unlikely to be the widest. It basically boils down to creating the GridCellRenderer and then calling renderer.GetBestWidth. But I have a better idea:
Prior to filling the grid, sort your cell values according to likely width. Insert the top 1% into the grid. Run AutoSizeColumn just like before. Then replace the 1% with your full dataset.
Very good idea. The sort execution time is negligible and the AutoSizeColumns too.
I do the sort directly on data outside the grid & GridTable, and I then simply AutoSizeColumns using the labels and the longest cell of each column (like a single row table). That’s perfect and cost less than 0.4sec wall time.
Thanks a lot Anders, you save my day 