Vcl.ComCtrls.TCustomComboBoxEx.ActionChange
Delphi
procedure ActionChange(Sender: TObject; CheckDefaults: Boolean); override;
C++
DYNAMIC void __fastcall ActionChange(System::TObject* Sender, bool CheckDefaults);
Properties
Type | Visibility | Source | Unit | Parent |
---|---|---|---|---|
procedure function |
protected | Vcl.ComCtrls.pas Vcl.ComCtrls.hpp |
Vcl.ComCtrls | TCustomComboBoxEx |
Description
Responds when the action for which this combo box is a client changes.
ActionChange is called automatically when the action object specified by the Action property, or any of its properties, changes.
In TCustomComboBoxEx, ActionChange checks whether the action is a TActionList object, and if so, updates its Images and ItemIndex properties, as appropriate. It then calls the inherited method, which updates the Caption, Enabled, Hint, and Visible properties and the OnClick event handler.
The Sender parameter is the action object that changed. The CheckDefaults parameter indicates whether the control's properties should all be updated or only those that have not been explicitly changed from their default values. When CheckDefaults is true, only those properties and event handlers that have not been changed from the default values are updated.