136 lines
3.8 KiB
ObjectPascal
136 lines
3.8 KiB
ObjectPascal
{-----------------------------------------------------------------------------
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The contents of this file are subject to the Mozilla Public License
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Version 1.1 (the "License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http:{www.mozilla.org/MPL/MPL-1.1.html
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Software distributed under the License is distributed on an "AS IS" basis,
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WITHOUT WARRANTY OF ANY KIND, either expressed or implied. See the License for
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the specific language governing rights and limitations under the License.
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The Original Code is: JvMessageControl.pas, released on 2004-10-10
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The Initial Developer of the Original Code is André Snepvangers [ASnepvangers att users.sourceforge.net]
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Portions created by André Snepvangers are Copyright (C) 2004 André Snepvangers.
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All Rights Reserved.
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Contributor(s):
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You may retrieve the latest version of this file at the Project JEDI's JVCL home page,
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located at http:{jvcl.sourceforge.net
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Known Issues:
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It is still possible to move the component in IDE outside the parent.
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It could also be called as a feature. Object Treeview shows the
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correct parent.
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-----------------------------------------------------------------------------}
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// $Id: JvMessageControl.pas 10612 2006-05-19 19:04:09Z jfudickar $
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unit JvMessageControl;
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{$I jvcl.inc}
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interface
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uses
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{$IFDEF USEJVCL}
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{$IFDEF UNITVERSIONING}
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JclUnitVersioning,
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{$ENDIF UNITVERSIONING}
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{$ENDIF USEJVCL}
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SysUtils, Classes, Windows, Messages, Controls, Forms,
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JvControlComponent;
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type
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{$IFDEF UNIX}
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{ from Classes }
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TWndMethod = procedure(var Message: TMessage) of object;
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{$ENDIF UNIX}
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TJvMessageControl = class(TJvCustomControlComponent)
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private
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FSavedWinProc: TWndMethod;
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FOnMessage: TWndMethod;
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protected
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procedure SetParent(const Value: TWinControl); override;
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procedure ControlWinProc(var Message: TMessage);
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public
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destructor Destroy; override;
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published
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property Active;
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property OnMessage: TWndMethod read FOnMessage write FOnMessage;
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property Parent;
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end;
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{$IFNDEF USEJVCL}
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procedure Register;
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{$ENDIF !USEJVCL}
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{$IFDEF USEJVCL}
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{$IFDEF UNITVERSIONING}
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const
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UnitVersioning: TUnitVersionInfo = (
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RCSfile: '$URL: https://jvcl.svn.sourceforge.net/svnroot/jvcl/tags/JVCL3_32/run/JvMessageControl.pas $';
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Revision: '$Revision: 10612 $';
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Date: '$Date: 2006-05-19 21:04:09 +0200 (ven., 19 mai 2006) $';
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LogPath: 'JVCL\run'
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);
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{$ENDIF UNITVERSIONING}
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{$ENDIF USEJVCL}
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implementation
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{$IFNDEF USEJVCL}
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procedure Register;
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begin
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RegisterComponents('Jv Non-Visual', [TJvMessageControl]);
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end;
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{$ENDIF !USEJVCL}
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procedure TJvMessageControl.ControlWinProc(var Message: TMessage);
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begin
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if Active and Assigned(FOnMessage) then { user message/event handler installed ? }
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FOnMessage(Message);
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if Message.Result = 0 then
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FSavedWinProc(Message); { do the original stuff }
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end;
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procedure TJvMessageControl.SetParent(const Value: TWinControl);
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var
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WasActive: Boolean;
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begin
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if Value <> Parent then
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begin
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WasActive := Active;
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Active := False;
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if Assigned(Parent) then
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Parent.WindowProc := FSavedWinProc;
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inherited SetParent(Value);
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if Assigned(Parent) then
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begin
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FSavedWinProc := Parent.WindowProc;
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Parent.WindowProc := ControlWinProc; { intercept messages }
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end;
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Active := WasActive;
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end;
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end;
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destructor TJvMessageControl.Destroy;
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begin
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if Assigned(Parent) and not (csDestroying in Parent.ComponentState) then
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Parent.WindowProc := FSavedWinProc;
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inherited Destroy;
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end;
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{$IFDEF USEJVCL}
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{$IFDEF UNITVERSIONING}
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initialization
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RegisterUnitVersion(HInstance, UnitVersioning);
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finalization
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UnregisterUnitVersion(HInstance);
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{$ENDIF UNITVERSIONING}
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{$ENDIF USEJVCL}
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end.
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