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How can you get a ComboBox child of a DataGridView to process all keys, including "."?

Answer 1

A:

Partial answer to my question. In the Combobox I handle the KeyDown, TextChanged, and KeyUp events, which fire in that order. If I go from KeyDown to KeyUp with TextChanged skipped, I check whether the character was a Keys.Q or Keys.OemPeriod. (I'm not sure it's safe to others, like shift/D1, shift/D2, etc...). If it's one of those keys, I change the combobox text myself.

But that's not enough, because merely changing the text sets the cursor in the edit control (that belongs to the combobox) to the start of the text. So, to fix that, I use FindWindowEx to get the handle of the edit control, then send it a EM_SETSEL to reset the cursor to the end of the word.

Corey Trager 2008-10-14 22:05:19

Answer 2

+1 A:

By any chance, have you already solved your problem?

I have the same problem as yours, my custom control for DataGridView cannot receive letter Q, period, dollar, single quote, percent, etc.

I was able to solve the problem by changing the "switch .. default: return false" to "switch .. default: return !dataGridViewWantsInputKey"

I guess the pattern code from Microsoft for making your own usercontrol for datagridview is not optimal. This is the pattern code from Microsoft:

http://msdn.microsoft.com/en-au/library/7tas5c80(vs.80).aspx

public bool EditingControlWantsInputKey(
    Keys key, bool dataGridViewWantsInputKey)
{
    // Let the DateTimePicker handle the keys listed.
    switch (key & Keys.KeyCode)
    {
        case Keys.Left:
        case Keys.Up:
        case Keys.Down:
        case Keys.Right:
        case Keys.Home:
        case Keys.End:
        case Keys.PageDown:
        case Keys.PageUp:
            return true;
        default:
            return false; // I changed this to: return !dataGridViewWantsInputKey.  My usercontrol can now receive Q, period, dollar, etc.
    }
}

Michael Buen 2009-01-18 07:25:08

I have not solved the problem. I've tried your solution and that's not working for me, and after thinking about it, I'm not surprised. I'm using the combobox in the header, not a regular cell. I don't think my grid knows enough about my combobox to discover and use its IDataGridViewEditingControl interface. I mean, I think I have more problems than just this problem. I'm going to mark your answer as the accepted one anyway.

Corey Trager 2009-11-09 21:06:54

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How can you get a ComboBox child of a DataGridView to process all keys, including "."?

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