TCustomCheckListBox.KeyDown procedure
Handles key down messages for the control.
Declaration
procedure KeyDown(var Key: Word; Shift: TShiftState); overrideArguments
Key | Keystroke examined in the method. |
Shift | Shift, Control, or Alt modifier for the keystroke. |
Description
KeyDown is an overridden method in
TCustomCheckListBox
used to handle key down messages for the control. KeyDown ensures that the
value for the current check box is toggled when the
Space key is
pressed while the control has focus.
This includes setting ItemIndex to 0 when it has a value
not valid for the Items defined in the control. The inherited
Click method is called if ItemIndex is range adjusted. This
behavior is Delphi (version 7 at least) compatible.
If the check box at ItemIndex has its ItemEnabled property set to
True, the value in Checked is toggled. The
ClickCheck and ItemClick methods are called to trigger
the corresponding event handlers. The value in Key is set to
VK_UNKNOWN when the keystroke has been handled in the method.
The inherited KeyDown method is called to handle other key down events.
See also
An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.