WinComboBox as Editor/Viewer

[User (Old forums)]

#13591 |

Hello!

Any ideas how you successfully implement the ICellEditor and ICellViewer interfaces so that you can use a WinComboBox with the grid? I’ve successfully (and quite painlessly) implemented the interfaces for WinCheckBox as well as WinDatePicker, but WinComboBox is leaving me clueless. I think it’s the SetControlValue method that’s wrongly implemented, here’s how it looks:

void ICellEditor.SetControlValue(object value, IFormatProvider customFormatProvider)
{
this.SelectedItem = (ComboBoxItem)Convert.ChangeType(value, typeof(ComboBoxItem), customFormatProvider);
}

When I try to edit the cell this editor is in, it lags for a moment and I see the WinXP-style border of the control, but then it disappears and only white is shown in the cell. No button or drop down or anything. I had a similar issue before with my implementation of a custom WinDatePicker, in that case I had implemented SetControlValue wrong and fixing it fixed the issue. It works perfectly now. This is why I figured it might be the same problem with this control.

Any clues?

Imported from legacy forums. Posted by macke (had 2115 views)

[User (Old forums)]

#13592

This forum is cool, I often find the answer to my problem right after I post ;o)
I seem to have misunderstood how you implement the interfaces. Obviously you have to make the get/set methods return/set the same type that is defined by the cell.

Here’s my new implementation that works fine:
void ICellEditor.SetControlValue(object value, IFormatProvider customFormatProvider)
{
for (int i = 0; i < this.Items.Count; i++)
{
if (this.Items[i].Values[0].ToString() == (string)Convert.ChangeType(value, typeof(string), customFormatProvider))
{
this.SelectedItem = this.Items[i];
return;
}
}
}

Imported from legacy forums. Posted by macke (had 2862 views)

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