david
7ebea5ffa7
git-svn-id: https://192.168.0.254/svn/Componentes.Terceros.jvcl@12 7f62d464-2af8-f54e-996c-e91b33f51cbe
105 lines
2.5 KiB
ObjectPascal
105 lines
2.5 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: JvScreenCanvas.PAS, released on 2001-02-28.
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The Initial Developer of the Original Code is Sébastien Buysse [sbuysse att buypin dott com]
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Portions created by Sébastien Buysse are Copyright (C) 2001 Sébastien Buysse.
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All Rights Reserved.
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Contributor(s): Michael Beck [mbeck att bigfoot dott com].
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Last Modified: 2000-02-28
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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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-----------------------------------------------------------------------------}
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{$I JVCL.INC}
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unit JvScreenCanvas;
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interface
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uses
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Windows, SysUtils, Graphics, Forms;
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type
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TJvScreenCanvas = class(TObject)
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private
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FCanvas: TCanvas;
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FPainting: Boolean;
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FDummy: Integer;
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function GetHeight: Integer;
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function GetWidth: Integer;
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public
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constructor Create;
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destructor Destroy; override;
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property Canvas: TCanvas read FCanvas;
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published
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property Height: Integer read GetHeight write FDummy;
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property Width: Integer read GetWidth write FDummy;
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procedure BeginPaint;
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procedure EndPaint;
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end;
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implementation
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constructor TJvScreenCanvas.Create;
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begin
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inherited Create;
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FPainting := False;
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FCanvas := nil;
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end;
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destructor TJvScreenCanvas.Destroy;
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begin
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EndPaint;
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inherited Destroy;
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end;
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procedure TJvScreenCanvas.BeginPaint;
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begin
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if FPainting then
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Exit;
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try
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FCanvas := TCanvas.Create;
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FCanvas.Handle := GetDC(HWND_DESKTOP);
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FPainting := True;
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except
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FPainting := False;
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end;
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end;
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procedure TJvScreenCanvas.EndPaint;
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begin
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if not FPainting then
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Exit;
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ReleaseDC(HWND_DESKTOP, FCanvas.Handle);
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FCanvas.Free;
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FCanvas := nil;
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FPainting := False;
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end;
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function TJvScreenCanvas.GetHeight: Integer;
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begin
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Result := Screen.Height;
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end;
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function TJvScreenCanvas.GetWidth: Integer;
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begin
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Result := Screen.Width;
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end;
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end.
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