{
* This Source Code Form is subject to the terms of the Mozilla Public License,
* v. 2.0. If a copy of the MPL was not distributed with this file, You can
* obtain one at http://mozilla.org/MPL/2.0/
*
* Copyright (C) 2008-2012, Peter Johnson (www.delphidabbler.com).
*
* $Rev$
* $Date$
*
* Implements a simple transparent control designed to be placed over other
* controls to prevent user interaction with the "show cased" controls.
}
unit UShowCaseCtrl;
interface
uses
// Delphi
Controls;
type
{
TShowCaseCtrl:
Simple transparent control designed to be placed over other controls to
prevent user interaction with the "show cased" controls.
}
TShowCaseCtrl = class(TCustomControl)
protected
procedure CreateParams(var Params: TCreateParams); override;
{Modifies window creation parameters. Ensures control is transparent.
@param Params [in/out] In: default parameters. Out: transparent added to
required styles.
}
public
procedure Invalidate; override;
{Overrides window invalidation code to do nothing.
NOTE: we don't want any repainting since this will overwrite the showcased
item.
}
end;
implementation
uses
// Delphi
Windows;
{ TShowCaseCtrl }
procedure TShowCaseCtrl.CreateParams(var Params: TCreateParams);
{Modifies window creation parameters. Ensures control is transparent.
@param Params [in/out] In: default parameters. Out: transparent added to
required styles.
}
begin
inherited;
Params.ExStyle := Params.ExStyle or WS_EX_TRANSPARENT;
end;
procedure TShowCaseCtrl.Invalidate;
{Overrides window invalidation code to do nothing.
NOTE: we don't want any repainting since this will overwrite the showcased
item}
begin
// Do nothing.
// Do not call inherited.
end;
end.
