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Why ProcessDialogKey of the Form hosting TreeViewAdv not triggers Escape when TreeViewAdv has focus and Escape key ?

 

if TreeViewAdv has focus and Escape key is pressed, ProcessDialogKey event of the TreeViewAdv gets triggered only when the TreeNodeAdv is in edit mode (Setting LableEdit to true) . Hence ProcessDialogKey of the Form hosting TreeViewAdv not triggers Escape if TreeViewAdv has focus and Escape key is pressed.

To override this behavior , we can derive TreeViewAdv and override KeyDown event and call base.ProcessDialogKey to trigger Escape .

The following code snippet illustrates this.

C#

protected override void OnKeyDown(System.Windows.Forms.KeyEventArgs e)

{

base.ProcessDialogKey(e.KeyData);

 if (e.KeyData == System.Windows.Forms.Keys.Escape)

{

e.Handled = false;

}

 base.OnKeyDown(e);

 }

VB

Protected Overrides Sub OnKeyDown(ByVal e As System.Windows.Forms.KeyEventArgs)

MyBase.ProcessDialogKey(e.KeyData)

 If e.KeyData = System.Windows.Forms.Keys.Escape Then

e.Handled = False

End If

 MyBase.OnKeyDown(e)

 End Sub

Article ID: Published Date: Last Revised Date: Platform: Control:
1823 04/30/2011 07/10/2014 WinForms TreeViewAdv
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