OnKeyDown

Syntax

Sub OnKeyDown(Sender: Object; Args: IKeyEventArgs);

Begin

//set of operators;

End Sub OnKeyDown;

Parameters

Sender. Parameter that returns the component, generated an event

Args. Parameter that allows to determine the event parameters.

Description

The OnKeyDown event occurs if a component is focused and a keyboard key is pressed.

Comments

The event occurs on pressing such auxiliary keys as SHIFT, ALT and CTRL.

If it is not necessary to recognize the auxiliary keys pressing, it is reasonable to use the OnKeyPress event.

Example

Executing the example requires a form. Several components that can receive focus are placed on the form. The following procedure is used as a handler of the OnKeyDown event for all components:

Sub OnKeyDown(Sender: Object; Args: IKeyEventArgs);
Begin
    If (Args.ShiftState = ShiftState.Ctrl) And (Args.Key = Keys.B) Then
        Text := (Sender As IControl).Name;
    End If;
End Sub OnKeyDown;

The name of this component with Down word is displayed in the form name, if the combination of CTRL+B keys is pressed in the area of any component, after an example execution.