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#38: How can I add a flat/hot track effect for your components

If you want to add a useful feature to your component (like URL in html or PageControl/TabControl.HotTrack) you must handle the CM_MOUSEENTER and CM_MOUSELEAVE messages:

type
  TyourControl = class(TDescControl)
  private
    { Private declarations }
    FLinkFont: TFont;
    FPassiveFont: TFont;

    procedure CMMouseEnter(var Msg: TMessage); message CM_MOUSEENTER;
    procedure CMMouseLeave(var Msg: TMessage); message CM_MOUSELEAVE;
  end;

implementation

procedure TyourControl.CMMouseEnter(var Msg: TMessage);
begin
 //Change color when mouse is over control
 Font.Assign(FLinkFont);
end;

procedure TyourControl.CMMouseLeave(var Msg: TMessage);
begin
 //Change color when mouse leaves control
 Font.Assign(FPassiveFont);
end;

As example, you can view a sources of the TURLLabel and/or THighLightLabel components on our site.

Published: November 4, 1999

See also

	dBase Viewer
	ABA Document Convert
	Paradox to MS Access converter
	Mail parser (ActiveX)
	Metafile Convert
	SMMsg suite
	ABA Picture Convert
	DBExport tools
	DBISAM Password Recovery
	Clarion Viewer

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