让cxGrid像Excel那样高亮显示选区的行号列标

http://www.oschina.net/code/snippet_54100_1102

Developer Express的cxGrid控件是一个相当有特色的数据栅格组件，支持自动分组、卡片式显示、和像Excel那样的过滤功能等。不过它在多选区时的显示 方式却不太友善，对于我这样还有点追求的人来说肯定是不会满足的了，于是通过它的OnDrawColumnHeader事件和 OnDrawIndicatorCell事件把它变成像Excel那样以高亮显示行号列标。

PS：我平时是用来显示数据的，没有考虑编辑状态；为了说明效果，cxGrid使用DBTableView并设成允许多选和选区方式（在OptionsView里有设）。

OnDrawColumnHeader事件源码如下：

 

标签： cxGrid 表格 DBTableView

 

procedure TfrmAccount.cxtvMasterCustomDrawColumnHeader(
   Sender: TcxGridTableView; ACanvas: TcxCanvas;
   AViewInfo: TcxGridColumnHeaderViewInfo; var ADone: Boolean);
var
     AButtonState: TcxButtonState;
     ARect: TRect;
begin
    if AViewInfo.Column.Selected then begin
         AButtonState := cxbsHot;
         ARect := AViewInfo.Bounds;
         Sender.LookAndFeelPainter.DrawHeader(ACanvas, ARect, AViewInfo.TextAreaBounds
             , [], cxBordersAll, AButtonState, AViewInfo.Column.HeaderAlignmentHorz
             , AViewInfo.Column.HeaderAlignmentVert, False, False
             , AViewInfo.Column.Caption, ACanvas.Font, Sender.Styles.Selection.TextColor
             , Sender.Styles.Selection.Color);
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   文章为作者原创，转载前请先与本人联系，转载请注明文章出处、保留作者信息，谢谢支持！
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         ARect.Left := ARect.Right - 19;
         ARect.Right := ARect.Right - 1;
         InflateRect(ARect, -1, -3);
        if AViewInfo.Column.Options.Filtering then begin
             Sender.LookAndFeelPainter.DrawFilterDropDownButton(ACanvas, ARect
                 , cxbsNormal, AViewInfo.Column.Filtered);
             OffsetRect(ARect, -16, 0);
        end;
        if AViewInfo.Column.SortIndex <> -1 then
             Sender.LookAndFeelPainter.DrawSortingMark(ACanvas, ARect
                 , AViewInfo.Column.SortOrder=soAscending);
         ADone := true;
    end;
end;
 
OnDrawIndicatorCell事件源码如下：
procedure TfrmAccount.cxtvMasterCustomDrawIndicatorCell(
   Sender: TcxGridTableView; ACanvas: TcxCanvas;
   AViewInfo: TcxCustomGridIndicatorItemViewInfo; var ADone: Boolean);
var
     AButtonState: TcxButtonState;
     clFont, clBrush: TColor;
begin
    if not (AViewInfo is TcxGridIndicatorRowItemViewInfo) then Exit;
 
    if TcxGridIndicatorRowItemViewInfo(AViewInfo).GridRecord.Selected then begin
         AButtonState := cxbsHot;
        if Sender.LookAndFeelPainter.LookAndFeelStyle = lfsOffice11 then begin
             clFont := ACanvas.Font.Color;
             clBrush := ACanvas.Brush.Color;
        end else begin
             clFont := Sender.Styles.Selection.TextColor;
             clBrush := Sender.Styles.Selection.Color;
       end;
     end else begin
         AButtonState := cxbsNormal;
         clFont := ACanvas.Font.Color;
         clBrush := ACanvas.Brush.Color;
    end;
     Sender.LookAndFeelPainter.DrawHeader(ACanvas, AViewInfo.ContentBounds,
         AViewInfo.ContentBounds, [], [bLeft, bRight, bBottom], AButtonState, taCenter
         , vaCenter, False, False, IntToStr(TcxGridIndicatorRowItemViewInfo(AViewInfo).GridRecord.Index + 1)
         , ACanvas.Font, clFont, clBrush);
     ADone := True;
end;