Handling Popup's Keyboard Input
When the arrow button is clicked, the pop up of RadPopupEditor is opened. Once opened, it handles the user's keyboard input. Thus, with the help of the PopupManager different system keys (e.g. Escape, Enter, etc.) are managed. For example, when the user hits the Escape key, the pop up is expected to be closed by default.
As of R1 2021 the RadPopupEditor.Popup offers keyboard handling via its KeyDown event. Thus, it is possible to handle the Escape key (or any KeyData) and prevent the default logic for closing the drop down.
Handling Escape
private void Popup_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyData== Keys.Escape)
{
e.Handled = true;
}
}
Private Sub Popup_KeyDown(sender As Object, e As KeyEventArgs)
If e.KeyData = Keys.Escape Then
e.Handled = True
End If
End Sub
The KeyEventArgs exposes the following useful information:
- Alt: Gets a value indicating whether the ALT key was pressed.
- Control: Gets a value indicating whether the CTRL key was pressed.
- Handled: Gets or sets a value indicating whether the event was handled.
- KeyCode: Gets the keyboard code for a System.Windows.Forms.Control.KeyDown or System.Windows.Forms.Control.KeyUp event.
- KeyValue: Gets the keyboard value for a System.Windows.Forms.Control.KeyDown or System.Windows.Forms.Control.KeyUp event.
- KeyData: Gets the key data for a System.Windows.Forms.Control.KeyDown or System.Windows.Forms.Control.KeyUp event.
- Modifiers: Gets the modifier flags for a System.Windows.Forms.Control.KeyDown or System.Windows.Forms.Control.KeyUp event. The flags indicate which combination of CTRL, SHIFT, and ALT keys was pressed.
- Shift: Gets a value indicating whether the SHIFT key was pressed.
- SuppressKeyPress: Gets or sets a value indicating whether the key event should be passed on to the underlying control.