RE: DataGridView editable combobox Left Right Arrow keys
- From: v-lliu@xxxxxxxxxxxxxxxxxxxx (Linda Liu[MSFT])
- Date: Wed, 26 Mar 2008 11:16:50 GMT
Hi John,
Thank you for your sample project! I did see the problem when I run it on
my machine.
If a DataGridViewTextBoxCell is in edit mode and we press the Left or Right
arrow key, the input cursor will be moved within this cell. However, the
Left or Right arrow key doesn't work the same in a DataGridViewComboBoxCell
when it is in edit mode. Because by default a DataGridViewComboBoxCell is
not editable at all, the DataGridView class treats textbox cells and
combobox cells differently. I'd like to say that this behavior is by design.
A workaround is derive a new class from the DataGridView class and override
the ProcessDataGridViewKey method. In the override method, we get the
current edit control and set the SelectionStart property of the control to
the value we want and then return true to indicate that we have processed
this key.
The following is a sample:
class MyDataGridView : DataGridView
{
protected override bool ProcessDataGridViewKey(KeyEventArgs e)
{
if (e.KeyData == Keys.Left || e.KeyData == Keys.Right)
{
if (this.EditingControl != null)
{
if (this.EditingControl.GetType() ==
typeof(DataGridViewComboBoxEditingControl))
{
ComboBox control = this.EditingControl as ComboBox;
if (control.DropDownStyle !=
ComboBoxStyle.DropDownList)
{
switch (e.KeyData)
{
case Keys.Left:
if (control.SelectionStart > 0)
{
control.SelectionStart--;
return true;
}
break;
case Keys.Right:
if (control.SelectionStart <
control.Text.Length)
{
control.SelectionStart++;
return true;
}
break;
}
}
}
}
}
return base.ProcessDataGridViewKey(e);
}
}
The derived DataGridView works well on my side. Please try it on your form
to see if there is any problem and let me know the result.
Sincerely,
Linda Liu
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