cxGrid在内置右键菜单的后面增加菜单项并实现诸多功能

贴一些小技巧,希望与各位使用cxGrid的朋友共同交流
各位有什么好个技巧也可以贴出来:

技巧二：在内置右键菜单的后面增加菜单项

首先应在Form上加一个cxGridPopupMenu控件 以启用右键菜单
UseBuildInPopupMenus设为True

procedure TFormItemList.FormCreate(Sender: TObject);
var
AMenu: TComponent;
FMenuItem, FSubMenuItem: TMenuItem;
begin
AMenu := nil;
if cxGridPopupMenu.BuiltInPopupMenus.Count = 0 then
Exit;
AMenu := cxGridPopupMenu.BuiltInPopupMenus[0].PopupMenu; //第一个内置右键菜单(表头菜单)
if Assigned(AMenu) and AMenu.InheritsFrom(TPopupMenu) then
begin
TPopupMenu(AMenu).AutoHotkeys := maManual; //手动热键

//-------------------------
FMenuItem := TMenuItem.Create(Self);
FMenuItem.Caption := '-';
FMenuItem.Name := 'miLineForGroup';
TPopupMenu(AMenu).Items.Add(FMenuItem);

//展开所有组
FMenuItem := TMenuItem.Create(Self);
FMenuItem.Name := 'miExpandAllGroup';
FMenuItem.Caption := '展开所有组(&X)';
FMenuItem.OnClick := miExpandAllGroupClick;
TPopupMenu(AMenu).Items.Add(FMenuItem);

//收缩所有组
FMenuItem := TMenuItem.Create(Self);
FMenuItem.Name := 'miCollapseAllGroup';
FMenuItem.Caption := '收缩所有组(&O)';
FMenuItem.OnClick := miCollapseAllGroupClick;
TPopupMenu(AMenu).Items.Add(FMenuItem);

//-------------------------
FMenuItem := TMenuItem.Create(Self);
FMenuItem.Caption := '-';
TPopupMenu(AMenu).Items.Add(FMenuItem);

//过滤面板
FMenuItem := TMenuItem.Create(Self);
FMenuItem.Name := 'miFilterPanel';
FMenuItem.Caption := '过滤面板(&P)';
//自动显示
FSubMenuItem := TMenuItem.Create(Self);
FSubMenuItem.Name := 'miFilterPanelAuto';
FSubMenuItem.Caption := '自动(&A)';
FSubMenuItem.RadioItem := True;
FSubMenuItem.GroupIndex := 5; //指定同一组
FSubMenuItem.Checked := True;
FSubMenuItem.OnClick := miFilterPanelClick;
FMenuItem.Add(FSubMenuItem); //加入二级子菜单
//总是显示
FSubMenuItem := TMenuItem.Create(Self);
FSubMenuItem.Name := 'miFilterPanelAlways';
FSubMenuItem.Caption := '总是显示(&W)';
FSubMenuItem.RadioItem := True;
FSubMenuItem.GroupIndex := 5;
FSubMenuItem.OnClick := miFilterPanelClick;
FMenuItem.Add(FSubMenuItem);
//从不显示
FSubMenuItem := TMenuItem.Create(Self);
FSubMenuItem.Name := 'miFilterPanelNerver';
FSubMenuItem.Caption := '从不显示(&N)';
FSubMenuItem.RadioItem := True;
FSubMenuItem.GroupIndex := 5;
FSubMenuItem.OnClick := miFilterPanelClick;
FMenuItem.Add(FSubMenuItem);
TPopupMenu(AMenu).Items.Add(FMenuItem);

//自定义过滤
FMenuItem := TMenuItem.Create(Self);
FMenuItem.Name := 'miCustomFilter';
FMenuItem.Caption := '自定义过滤(&M)';
FMenuItem.OnClick := miCustomFilterClick;
TPopupMenu(AMenu).Items.Add(FMenuItem);

//过滤管理器
FMenuItem := TMenuItem.Create(Self);
FMenuItem.Name := 'miFilterBuilder';
TPopupMenu(AMenu).Images.AddImage(FormMain.ImageListExtend, 44); //添加图标图像
FMenuItem.ImageIndex := TPopupMenu(AMenu).Images.Count - 1; //指定图标序号
FMenuItem.Caption := '过滤管理器';
FMenuItem.OnClick := Self.miFilterBuilderClick;
TPopupMenu(AMenu).Items.Add(FMenuItem);

//---------------------
FMenuItem := TMenuItem.Create(Self);
FMenuItem.Caption := '-';
TPopupMenu(AMenu).Items.Add(FMenuItem);

//导出
FMenuItem := TMenuItem.Create(Self);
FMenuItem.Name := 'miExport';
TPopupMenu(AMenu).Images.AddImage(FormMain.ImageListExtend, 37);
FMenuItem.ImageIndex := TPopupMenu(AMenu).Images.Count - 1;
FMenuItem.Caption := '导出(&E)';
FMenuItem.OnClick := Self.miExportClick;
TPopupMenu(AMenu).Items.Add(FMenuItem);

//打印
FMenuItem := TMenuItem.Create(Self);
FMenuItem.Name := 'miPrint';
FMenuItem.Caption := '打印(&P)';
TPopupMenu(AMenu).Images.AddImage(FormMain.ImageListExtend, 14);
FMenuItem.ImageIndex := TPopupMenu(AMenu).Images.Count - 1;
FMenuItem.OnClick := Self.miPrintClick;
TPopupMenu(AMenu).Items.Add(FMenuItem);
end;
end;

procedure TFormItemList.miExportClick(Sender: TObject);
var
FileName, FileExt, msg: String;
begin
if Self.aqyQuery.IsEmpty then
begin
msg := '没有导出数据...';
Application.MessageBox(PChar(msg), PChar(Application.Title),
MB_OK or MB_IconWarning);
Exit;
end;

Self.SaveDialogExport.Filter := 'Excel文件 (*.xls)|*.xls|XML文件 (*.xml)|*.xml'
+ '|文本文件 (*.txt)|*.txt|网页文件 (*.html)|*.html';
Self.SaveDialogExport.Title := '导出为';

if not Self.SaveDialogExport.Execute then
Exit;

FileName := Self.SaveDialogExport.FileName;
FileExt := LowerCase(ExtractFileExt(FileName));
if FileExt = '.xls' then
ExportGrid4ToExcel(FileName, Self.cxGrid1)
else if FileExt = '.xml' then
ExportGrid4ToXML(FileName, Self.cxGrid1)
else if FileExt = '.txt' then
ExportGrid4ToText(FileName, Self.cxGrid1)
else if FileExt = '.html' then
ExportGrid4ToHTML(FileName, Self.cxGrid1)
else
begin
msg := '不支持的导出文件类型...';
Application.MessageBox(PChar(msg), PChar(Application.Title),
MB_OK or MB_IconError);
Exit;
end;

msg := '导出完成...';
Application.MessageBox(PChar(msg), PChar(Application.Title),
MB_OK or MB_IconInformation);
end;

procedure TFormItemList.miPrintClick(Sender: TObject);
begin
//打印
Self.dxComponentPrinter.Preview(True, Self.dxComponentPrinterLink1);
end;

procedure TFormItemList.cxGridPopupMenuPopup(ASenderMenu: TComponent;
AHitTest: TcxCustomGridHitTest; X, Y: Integer; var AllowPopup: Boolean);
begin
if GetHitTypeByHitCode(AHitTest.HitTestCode) = gvhtColumnHeader then //右击列标题时
begin
//if tvResult.DataController.Groups.GroupingItemCount > 0 then
if tvResult.GroupedColumnCount > 0 then //有分组时显示
begin
TMenuItem(Self.FindComponent('miLineForGroup')).Visible := True;
TMenuItem(Self.FindComponent('miExpandAllGroup')).Visible := True;
TMenuItem(Self.FindComponent('miCollapseAllGroup')).Visible := True;
end
else
begin
TMenuItem(Self.FindComponent('miLineForGroup')).Visible := False;
TMenuItem(Self.FindComponent('miExpandAllGroup')).Visible := False;
TMenuItem(Self.FindComponent('miCollapseAllGroup')).Visible := False;
end;
end;
end;

procedure TFormItemList.miFilterBuilderClick(Sender: TObject);
begin
//过滤管理器
//弹出Filter Builder Dialog对话框
tvResult.Filtering.RunCustomizeDialog;
end;

procedure TFormItemList.miCustomFilterClick(Sender: TObject);
var
AHitTest: TcxCustomGridHitTest;
begin
//自定义过滤
//弹出Custom Filter Dialog对话框
AHitTest := cxGridPopupMenu.HitTest;
if GetHitTypeByHitCode(AHitTest.HitTestCode) = gvhtColumnHeader then //获得右击的列
tvResult.Filtering.RunCustomizeDialog(TcxGridColumnHeaderHitTest(AHitTest).Column);
end;

procedure TFormItemList.miFilterPanelClick(Sender: TObject);
var
mi: TMenuItem;
begin
//隐藏/显示过滤面板
mi := TMenuItem(Sender);
mi.Checked := True;
if mi.Name = 'miFilterPanelAlways' then
tvResult.Filtering.Visible := fvAlways
else if mi.Name = 'miFilterPanelNerver' then
tvResult.Filtering.Visible := fvNever
else
tvResult.Filtering.Visible := fvNonEmpty;
end;

procedure TFormItemList.miExpandAllGroupClick(Sender: TObject);
begin
//展开所有组
tvResult.DataController.Groups.FullExpand;
end;

procedure TFormItemList.miCollapseAllGroupClick(Sender: TObject);
begin
//收缩所有组
tvResult.DataController.Groups.FullCollapse;
end;