自绘XP风格菜单

　　这是以前写的代码，自绘XP风格的菜单，硬盘坏了后以为没了，最后写的一个软件要自定义风格，“翻箱倒柜”的终于在我可爱的古董机^_^上找到了一个应用的例子。还是把它放到Blog上来，即可共享又可作为备用 :)
　　把主菜单的OnMeasureItem指向MeasureMainItem、OnAdvancedDrawItem指向DrawMainItem，子菜单的OnMeasureItem指向MeasureSubItem、OnAdvancedDrawItem指向DrawSubItem，调整颜色或使用默认颜色即可达到效果

//调整主菜单项尺寸
procedure MeasureMainItem(Sender: TObject; ACanvas: TCanvas; var Width, Height: Integer);
begin
  Width := Width + 6;
  Height := Height + 2;
end;

//调整子菜单项尺寸
procedure MeasureSubItem(Sender: TObject; ACanvas: TCanvas; var Width, Height: Integer);
begin
  Width := Width + 20;
  Height := Height + 2;
end;

//绘制主菜单内容
procedure DrawMainItem(Sender: TObject; ACanvas: TCanvas; ARect: TRect; State: TOwnerDrawState);
const
  MainMenuBackColor      : TColor = $DEEDEF;
  MainMenuBorderColor    : TColor = $DEEDEF;
  MainMenuSelectedBackColor  : TColor = $DFA988;
  MainMenuSelectedBorderColor: TColor = $C08000;
  MainMenuHotLightBackColor  : TColor = $DEEDEF;
  MainMenuHotLightBorderColor: TColor = $800080;
  MainMenuGrayedBackColor  : TColor = $DEEDEF;
var
  BrushColor, PenColor: TColor;
  TextRect: TRECT;
begin
  if odGrayed in State then
  begin
    BrushColor := MainMenuGrayedBackColor;
    PenColor := MainMenuGrayedBackColor;
  end
  else
    if odHotLight in State then
    begin   //鼠标划过
      BrushColor := MainMenuHotLightBackColor;
      PenColor := MainMenuHotLightBorderColor;
    end
    else
    if odSelected in State then
    begin
      BrushColor := MainMenuSelectedBackColor;
      PenColor := MainMenuSelectedBorderColor;
    end
    else
    begin
      BrushColor := MainMenuBackColor;
      PenColor := MainMenuBackColor;
      if TMenuItem(Sender).Caption = '帮助(&H)' then ARect.Right := ARect.Right + 1600;
    end;
  ACanvas.Brush.Color := BrushColor;
  ACanvas.Pen.Color := PenColor;
  //ACanvas.FillRect(ARect);
  ACAnvas.Rectangle(ARect);
  ACanvas.Brush.Style := bsClear;
  //绘出文字
  if odGrayed in State then
    ACanvas.Font.Color := clBtnShadow
  else
    ACanvas.Font.Color := clBlack;
  SetRect(TextRect, ARect.left+10, ARect.top+3, ARect.right, ARect.bottom);
  DrawText(ACanvas.Handle, PChar(TMenuItem(Sender).Caption), Length(TMenuItem(Sender).Caption),
       TextRect, DT_LEFT);
end;

//绘制子菜单内容
procedure DrawSubItem(Sender: TObject; ACanvas: TCanvas; ARect: TRect; State: TOwnerDrawState);
const
  SubMenuBackColor      : TColor = $F7F8F9;
  SubMenuBorderColor    : TColor = $DEEDEF;
  SubMenuSelectedBackColor  : TColor = $EED2C1;
  SubMenuSelectedBorderColor: TColor = $C08000;
  SubMenuLineColor      : TColor = $C8D0D4;
  //SubMenuHotLightBorderColor: TColor = $C08000;
  SubMenuGrayedBackColor  : TColor = $F7F8F9;//$DEEDEF;
var
  BrushColor, PenColor: TColor;
  TextRect: TRECT;
  str: String;
  ImageList: TCustomImageList;
begin
  if (odGrayed in State) and not(TMenuItem(Sender).IsLine) then
  begin
    BrushColor := SubMenuGrayedBackColor;
    {if odSelected in State then
      PenColor := SubMenuSelectedBorderColor
    else}
      PenColor := SubMenuGrayedBackColor;
  end
  else
    if odSelected in State then
    begin
      BrushColor := SubMenuSelectedBackColor;
      PenColor := SubMenuSelectedBorderColor;
    end
    else
    begin
      BrushColor := SubMenuBackColor;
      PenColor := SubMenuBackColor;
    end;
  ACanvas.Brush.Color := BrushColor;
  ACanvas.Pen.Color := PenColor;
  ACAnvas.Rectangle(ARect);
  if not(odSelected in State) or (odGrayed in State) then
  begin
    ACanvas.Brush.Color := SubMenuBorderColor;
    ACanvas.FillRect(Rect(ARect.Left, ARect.Top, ARect.Left+20, ARect.Bottom));
  end;
  //绘文字和快捷键
  if TMenuItem(Sender).IsLine then
  begin
    ACanvas.Brush.Color := SubMenuLineColor;
    ACanvas.Pen.Color := SubMenuLineColor;
    ACanvas.FillRect(Rect(ARect.Left+23, ARect.Top+(ARect.Bottom-ARect.Top) div 2-1,
             ARect.Right-2, ARect.Top+(ARect.Bottom-ARect.Top) div 2));
  end
  else
  begin
    ACanvas.Brush.Style := bsClear;
    if odGrayed in State then
      ACanvas.Font.Color := clBtnShadow
    else
      ACanvas.Font.Color := clBlack;
    str := TMenuItem(Sender).Caption;
    SetRect(TextRect, ARect.Left+24, ARect.Top+3, ARect.Right, ARect.Bottom);
    DrawText(ACanvas.Handle, PChar(str), Length(str), TextRect, DT_LEFT);
    str := ShortCutToText(TMenuItem(Sender).ShortCut);
    SetRect(TextRect, ARect.Left+24, ARect.Top+3, ARect.Right-10, ARect.Bottom);
    DrawText(ACanvas.Handle, PChar(str), Length(str), TextRect, DT_RIGHT);
    //
    if TMenuItem(Sender).Checked then
    begin
      ACanvas.Font.Charset := DEFAULT_CHARSET;
      ACanvas.Font.Name := 'Webdings';
      if TMenuItem(Sender).RadioItem then
        ACanvas.TextOut(ARect.Left+4, ARect.Top, '=')
      else
      begin
        ACanvas.Font.Height := -16;
        ACanvas.TextOut(ARect.Left+2, ARect.Top, 'a');
      end;
    end;
  end;
  //绘制图片
  ImageList := TMenuItem(Sender).GetImageList;
  if ImageList<>nil then
    if (odSelected in State) and not(odGrayed in State) then
      ImageList.Draw(ACanvas, ARect.left+2, ARect.Top+2, TMenuItem(Sender).ImageIndex)
    else
      ImageList.Draw(ACanvas, ARect.left+3, ARect.Top+3,
               TMenuItem(Sender).ImageIndex, TMenuItem(Sender).Enabled);
end;

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