Mega Code Archive
How to use CM_MOUSEENTER and CM_MOUSELEAVE in a component
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Title: How to use CM_MOUSEENTER and CM_MOUSELEAVE in a component
unit ImageEx;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms,
Dialogs, ExtCtrls;
type
TImageEx = class (TImage)
private
{ Private declarations }
FOnMouseLeave: TNotifyEvent;
FOnMouseEnter: TNotifyEvent;
procedure CMMouseEnter(var msg: TMessage);
message CM_MOUSEENTER;
procedure CMMouseLeave(var msg: TMessage);
message CM_MOUSELEAVE;
protected
{ Protected declarations }
procedure DoMouseEnter; dynamic;
procedure DoMouseLeave; dynamic;
public
{ Public declarations }
published
{ Published declarations }
property OnMouseEnter: TNotifyEvent read FOnMouseEnter write FOnMouseEnter;
property OnMouseLeave: TNotifyEvent read FOnMouseLeave write FOnMouseLeave;
end;
procedure Register;
implementation
procedure Register;
begin
RegisterComponents('Additional', [TImageEx]);
end;
{ TImageEx }
procedure TImageEx.CMMouseEnter(var msg: TMessage);
begin
DoMouseEnter;
end;
procedure TImageEx.CMMouseLeave(var msg: TMessage);
begin
DoMouseLeave;
end;
procedure TImageEx.DoMouseEnter;
begin
if Assigned(FOnMouseEnter) then FOnMouseEnter(Self);
end;
procedure TImageEx.DoMouseLeave;
begin
if Assigned(FOnMouseLeave) then FOnMouseLeave(Self);
end;
end.
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