Mega Code Archive
Assign an event handler to all components
<![CDATA[
Title: assign an event handler to all components?
{
This example shows how to assign a OnContextPopup event
handler to all components at runtime using SetMethodProp().
(Here: OnContextPopup event handler)
}
{
Diese Beispiel zeigt, wie man mit Hilfe von SetMethodProp()
allen Komponenten ein Ereignis (hier: OnContextPopup Ereignis)
zur Laufzeit zuweisen kann.
}
private
{ Private declarations }
procedure AssignOnContextPopupEvent;
procedure OnContextPopup(Sender: TObject; MousePos: TPoint;
var Handled: Boolean);
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
uses
TypInfo;
procedure TForm1.OnContextPopup(Sender: TObject; MousePos: TPoint;
var Handled: Boolean);
begin
with Sender as TComponent do
ShowMessage(Name + ' right-clicked!');
end;
procedure TForm1.AssignOnContextPopupEvent;
var
i: Integer;
PropInfo: PPropInfo;
Method: TMethod;
PEvent: ^TContextPopupEvent;
begin
for i := 0 to ComponentCount - 1 do
begin
PropInfo := GetPropInfo(Components[i].ClassInfo, 'OnContextPopup');
if (PropInfo nil) and (PropInfo^.PropType^^.Kind = tkMethod) then
begin
Method := GetMethodProp(Components[i], PropInfo);
if not Assigned(Method.Code) then
begin
PEvent := @Method.Code;
PEvent^ := OnContextPopup;
Method.Data := Self;
SetMethodProp(Components[i], PropInfo, Method);
end;
end;
end;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
AssignOnContextPopupEvent;
end;
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