cxGrid用法-最新
Posted 【麦麦提敏】
tags:
篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了cxGrid用法-最新相关的知识,希望对你有一定的参考价值。
cxGrid用法步
1.你先放一个cxGrid,设置好View,设置View.DataController连接的DataSource 2.激活DataSource连接的DataSet,双击cxGrid,点击Retrieve Fields,取得所有的Column 3.设置View的OptionsView.Footer=True,OptionsView.GroupFooters=True,这是为了把分组小计和总计面板显示出来 4.将“订单号”字段拖到cxGrid上方的分组面板(GroupbyBox),将数据按“订单号”分组。这时你会发现单身所有的数据都缩起来了,如果想使所有的数据都展开,可以设置View.DataController.Options.dcoGroupsAlwaysExpanded=True 5.设置分组小计:把View.DataController.Summary.DefaultGroupSummaryItems点开,新增一个Item,Column属性在下拉里选择“数量”字段,FieldName属性为空,Format属性可以设置数值的显示格式,Kind属性下拉skSum加总,Position属性一定要选择spFooter。 6.设置总计:把View.DataController.Summary.FooterSummaryItems点开,新增一个Item,Column属性在下拉里选择“数量”字段,FieldName属性为空,Format属性可以设置数值的显示格式,Kind属性下拉skSum加总,Position属性一定要选择spFooter。 大功告成,按F9看一下胜利果实吧。 再奉送一个技巧,在Form1再放一个TcxGridPopupMenu控件,就在cxGrid控件旁边的那个,把TcxGridPopupMenu的Grid属性设置成你的cxGrid。 然后运行程序,在运行状态,点击Grid上的所有地方,左键或右键,你都会有意外收获。
(1)动态设置显示格式 procedure SetDisplayFormat(ACtrlData: TClientDataSet; TbView: TcxGridDBTableView); var i: integer; begin if ACtrlData.RecordCount <= 0 then Exit; try TbView.ClearItems; ACtrlData.First; for i := 0 to ACtrlData.RecordCount - 1 do begin if ACtrlData.FieldByName(‘SQBF_DisplayInGrid‘).AsString = ‘1‘ then //在表格中显示 with TbView.CreateColumn do begin DataBinding.FieldName := ACtrlData.FieldByName(‘SQBF_FieldName‘).AsString; Caption := ACtrlData.FieldByName(‘SQBF_Caption‘).AsString; //字段中文标题 Hint := ACtrlData.FieldByName(‘SQBF_Hint‘).AsString; Width := ACtrlData.FieldByName(‘SQBF_Width‘).AsInteger; HeaderAlignmentHorz := taCenter; end; ACtrlData.Next; end; except on E: Exception do SaveLog(‘设置显示格式时出错:‘ + E.Message); end; end; (2)显示行号 procedure TFmQueryBase.cxDBViewMasterCustomDrawIndicatorCell( Sender: TcxGridTableView; ACanvas: TcxCanvas; AViewInfo: TcxCustomGridIndicatorItemViewInfo; var ADone: Boolean); var FValue: string; FBounds: TRect; begin FBounds := AViewInfo.Bounds; if (AViewInfo is TcxGridIndicatorRowItemViewInfo) then begin ACanvas.FillRect(FBounds); ACanvas.DrawComplexFrame(FBounds, clBlack, clBlack, [bBottom, bLeft, bRight], 1); FValue := IntToStr(TcxGridIndicatorRowItemViewInfo(AViewInfo).GridRecord.Index+1); InflateRect(FBounds, -3, -2); //Platform specific. May not work on Linux. ACanvas.Font.Color := clBlack; ACanvas.Brush.Style := bsClear; ACanvas.DrawText(FValue, FBounds, cxAlignCenter or cxAlignTop); ADone := True; end; end; (3)设置显示格式,我的项目要求先动态添加字段,这时不知道字段类型,所以设置DisplayFormat不方便,我还没有找到好方法。 所以采用打开数据集后再设置: procedure TFmQueryBase.cdsMasterAfterOpen(DataSet: TDataSet); var i: Integer; begin for i := 0 to cxDBViewMaster.DataController.DataSet.FieldCount -1 do begin if cxDBViewMaster.DataController.DataSet.Fields[i] is TNumericField then begin if Pos(‘AMOUNT‘, UpperCase(cxDBViewMaster.DataController.DataSet.Fields[i].FieldName)) > 0 then begin TNumericField(cxDBViewMaster.DataController.DataSet.Fields[i]).DisplayFormat := ‘#,##0.000‘; Continue; end; if Pos(‘QUANTITY‘, UpperCase(cxDBViewMaster.DataController.DataSet.Fields[i].FieldName)) > 0 then begin TNumericField(cxDBViewMaster.DataController.DataSet.Fields[i]).DisplayFormat := ‘#,##0.000‘; Continue; end; if Pos(‘MONEY‘, UpperCase(cxDBViewMaster.DataController.DataSet.Fields[i].FieldName)) > 0 then begin TNumericField(cxDBViewMaster.DataController.DataSet.Fields[i]).DisplayFormat := ‘#,##0.00‘; Continue; end; end; end; end; 2007-7-19 12:48:54 查看评语»»» 2007-7-19 12:53:09 别人的,转载http://www.showding.cn/item/cxGrid__182526.aspx 最近在学习使用cxGrid,安装的版本是ExpressQuantumGrid Suite v5.10 我发现这个控件功能虽然强大,但是非常难用。 现在我手头就有几个问题还没解决: 1)主从模式下导出Excel中文会产生乱码,而且从表内容没有导出。 我不知道是不是因为我的字段名包括单引号的原因。 导出代码:ExportGrid4ToExcel(FileName, cxGrid); 2)主从模式下通过按钮对从表添加/删除行,代码怎么写。 附:单表添加/删除行的代码 procedure TFormAccount.cxButtonNewClick(Sender: TObject); begin Self.tvAccount.DataController.Append; Self.tvAccount.Columns[0].Focused := True; cxGrid.SetFocus; end; procedure TFormAccount.cxButtonDeleteClick(Sender: TObject); begin if Self.tvAccount.DataController.RowCount = 0 then Exit; if Application.MessageBox(‘确认删除当前记录?‘, ‘确认删除‘, MB_YesNo + MB_IconQuestion) = IDNO then Exit; Self.tvAccount.DataController.DeleteFocused; end; 3)动态创建主从结构出错(Compiler没错,运行时出现系统错误0000000018), 我使用了二个ADOStoreProcedure作主从表 代码如下: var Level: TcxGridLevel; GridView: TcxGridDBTableView; begin Level := cxGrid1.Levels[0].Add; GridView := TcxGridDBTableView(cxGrid1.CreateView(TcxGridDBTableView)); GridView.DataController.DataSource := Self.dsDetail; GridView.DataController.KeyFieldNames := ‘PurchOrderID;POLineNbr;PromiseDate;ReceiverDate‘; GridView.DataController.MasterKeyFieldNames := ‘VendorID‘; GridView.DataController.DetailKeyFieldNames := ‘VendorID‘; GridView.DataController.DataModeController.SmartRefresh := True; GridView.OptionsCustomize.ColumnHiding := True; GridView.OptionsCustomize.ColumnsQuickCustomization := True; GridView.OptionsData.Deleting := False; GridView.OptionsData.Inserting := False; GridView.OptionsView.Indicator := True; Level.GridView := GridView; GridView := TcxGridDBTableView(cxGrid1.Levels[0].GridView); GridView.DataController.KeyFieldNames := ‘VendorID‘; GridView.OptionsView.GroupByBox := False; //显示主表内容 tvResult.BeginUpdate; tvResult.ClearItems; tvResult.DataController.CreateAllItems; tvResult.EndUpdate; //显示明细表内容 GridView := TcxGridDBTableView(cxGrid1.Levels[0].Items[0].GridView); GridView.BeginUpdate; GridView.ClearItems; GridView.DataController.CreateAllItems; GridView.DataController.Refresh; GridView.EndUpdate; end; 此楼回复Re: -------------------------------------------------------------------------------- 小技巧:用代码展开/收缩主从结构 Self.tvDepartment.ViewData.Expand(True); Self.tvDepartment.ViewData.Collaspe(True); 注:tvDepartment为主表对应的TableView 此楼回复Re: -------------------------------------------------------------------------------- 你说的这几个问题我也遇到过。 第一个问题是编码的问题,修改了其中关于编码的函数,OK. 第二个问题在cxGrid的社区可以找到解答,但从表必须满足某种条件,例如关键字排序。 第三个问题的解决办法,你可以尝试在动态创建的代码前后加上: grid.beginupdate; ... grid.endupdate 来解决。 此楼回复Re: -------------------------------------------------------------------------------- 没用过 不要经常使用三方控件 此楼回复Re: -------------------------------------------------------------------------------- to tttk(网络芝麻): 第一个问题:如何修改啊,贴出代码 第二个问题:没搜到啊 第三个问题:试一下再说 此楼回复Re: -------------------------------------------------------------------------------- 不要经常使用三方控件 ====================== 我感觉不用cxGrid的话,没必要用Delphi了,呵呵 此楼回复Re: -------------------------------------------------------------------------------- 樓上這話是不是有點問題?DELPHI能做得事情很多很多,難道非要用CXGRID?CXGRID不是用DELPHI做出來得? 此楼回复Re: -------------------------------------------------------------------------------- 没用过..... 此楼回复Re: -------------------------------------------------------------------------------- 回复人: zxkid(没有人会像我这样...) ( ) 信誉:101 2006-01-06 16:58:00 得分: 0 不要经常使用三方控件 ====================== 我感觉不用cxGrid的话,没必要用Delphi了,呵呵 ********** 楼主乃天人也!! 此楼回复Re: -------------------------------------------------------------------------------- 呵呵 此楼回复Re: -------------------------------------------------------------------------------- cxGrid比较不错,我也使用过导出到Excel,没有遇到你说的乱码 主从表也没有问题的,其实跟单表操作还不是一回事 此楼回复Re: -------------------------------------------------------------------------------- up 此楼回复Re: -------------------------------------------------------------------------------- 没用过cxGrid,以后考虑 此楼回复Re: -------------------------------------------------------------------------------- 楼主乃天人也!! ============================= Delphi下有cxGrid, .NET下有XtraGrid, 它们都是同一公司出的。 迟早都会转到.NET,所以。。。 此楼回复Re: -------------------------------------------------------------------------------- 路过 此楼回复Re: -------------------------------------------------------------------------------- 用过,挺好,只会使用最简单的。 此楼回复Re: -------------------------------------------------------------------------------- 发一个邮件给我,我把解决乱码后的源代码发一分给你,放到你的项目文件夹下即可。 [email protected] 此楼回复Re: -------------------------------------------------------------------------------- 第二个问题:https://www.devexpress.com/Support/Center/default.aspx?view=ViewIssue&issueid=B2691 此楼回复Re: -------------------------------------------------------------------------------- 谢谢tttk(网络芝麻) 第二个问题:我现在直接让用户用导航条的删除/添加按钮了。根据你给的网址上的内容我知道大概该怎么写了,有空再试试。 第一个问题:不光是乱码问题,还有从表内容没导出的问题。 只有一个表的话是不会出现乱码的。 第三个问题:还没来得及试。 此楼回复Re: -------------------------------------------------------------------------------- 第一个问题:看了一下帮助,原来cxGrid不支持主从表的导出,只能导出主表(顶层表)的内容。晕 此楼回复Re: -------------------------------------------------------------------------------- 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; 此楼回复Re: -------------------------------------------------------------------------------- 在用,留名 此楼回复Re: -------------------------------------------------------------------------------- 技巧三 按条件计算合计值 在Footer的第一列显示[合计:] 加一个Summary项,Column设为Grid的第一列,Kind设为skNone 在该Summary项的OnGetText事件中,输入: procedure TFormExpense.tvExpenseTcxGridDBDataControllerTcxDataSummaryFooterSummaryItems2GetText( Sender: TcxDataSummaryItem; const AValue: Variant; AIsFooter: Boolean; var AText: String); begin AText := ‘合计:‘; end; 按条件汇总: 在TableView的DataController->Summary->FooterSummary->OnSummary事件中,输入: procedure TFormExpense.tvExpenseDataControllerSummaryFooterSummaryItemsSummary( ASender: TcxDataSummaryItems; Arguments: TcxSummaryEventArguments; var OutArguments: TcxSummaryEventOutArguments); begin //得到字段名 TcxDBDataSummaryItem(Arguments.SummaryItem).FieldName; if (ASender.DataController.Values[Arguments.RecordIndex, tvExpenseLevel.Index] > 1) //只统计Level列=1的值 and (TcxDBDataSummaryItem(Arguments.SummaryItem).Kind = skSum) then OutArguments.Value := 0; //Level > 1的统计值设为0 end; 此楼回复Re: -------------------------------------------------------------------------------- 借贵地一用,问个CXGrid问题,在cxgrid中如何使一些行不能编辑,如:字段isenable = false的行 此楼回复Re: -------------------------------------------------------------------------------- 楼上的问题 请参考下面的技巧 技巧四:根据某列的值设定其它列的可编辑性 procedure TFormUser.tvUserEditing(Sender: TcxCustomGridTableView; AItem: TcxCustomGridTableItem; var AAllow: Boolean); begin //如果第三列值为True,则第4列不能修改 if (tvUser.Controller.FocusedRecord.Values[2] = True) and (AItem.Index = 4) then AAllow := False else AAllow := True; end; 此楼回复Re: -------------------------------------------------------------------------------- 技巧五:保存/恢复Grid布局 //恢复布局 IniFileName := ExtractFilePath(Application.ExeName) + ‘Layout\‘ + Self.Name + ‘.ini‘; if FileExists(IniFileName) then Self.tvResult.RestoreFromIniFile(IniFileName) //从布局文件中恢复 else begin Self.tvResult.BeginUpdate; for i := 0 to Self.tvResult.ItemCount - 1 do Self.tvResult.Items[i].ApplyBestFit; //调整为最佳宽度 Self.tvResult.EndUpdate; end; //保存布局 IniFileName := ExtractFilePath(Application.ExeName) + ‘Layout\‘ + Self.Name + ‘.ini‘; if not DirectoryExists(ExtractFileDir(IniFileName)) then CreateDir(ExtractFileDir(IniFileName)); Self.tvResult.StoreToIniFile(IniFileName); //保存为布局文件 此楼回复Re: -------------------------------------------------------------------------------- 借用地问一下:在 cxgrid中,如果我同时选中主表与子表中的记录,怎么样能同时进行对其所选记录进行处理呢。 我现在只能判断 焦点是在主表还是从表中,然后只能对主表或子表中的数据进行处理。 此楼回复Re: -------------------------------------------------------------------------------- 看来用cxGrid人不多啊 再多贴一些技巧,需要的朋友顶一下 ========================================================================== 在主从TableView中根据主TableView得到对应的从TableView var ADetailDC: TcxGridDataController; AView: TcxCustomGridTableView; begin with cxGrid1DBTableView1.DataController do ADetailDC := TcxGridDataController(GetDetailDataController(FocusedRecordIndex, 0)); AView := ADetailDC.GridView; end; ============================================================================== 定位在第一行并显示内置编辑器 cxDBVerticalGrid1.FocusedRow := cxDBVerticalGrid1.Rows[0]; cxDBVerticalGrid1.ShowEdit; ============================================================================== 隐藏 "<No data to display>" 字符串 该文本存储在scxGridNoDataInfoText资源字符串,可以将该资源字符串的内容设为空 来隐藏该文本。 uses cxClasses, cxGridStrs; ... cxSetResourceString(@scxGridNoDataInfoText, ‘‘); //如果"<No data to display>" 字符串已经显示,需要调用: <View>.LayoutChanged; ============================================================ 删除应用过滤后的行 var I: Integer; begin with <GridView> do for I := 0 to ViewData.RecordCount - 1 do begin ViewData.Records[0].Focused := True; DataController.DataSet.Delete; end; ============================================================= 根据单元的值设置样式 procedure <aForm>.<aColumn>StylesGetContentStyle( Sender: TcxCustomGridTableView; ARecord: TcxCustomGridRecord; AItem: TcxCustomGridTableItem; out AStyle: TcxStyle); begin if ARecord.Values[AItem.Index] = aSomeValue then AStyle := <aSomeStyle>; end; procedure <aForm>.<aView>StylesGetContentStyle( Sender: TcxCustomGridTableView; ARecord: TcxCustomGridRecord; AItem: TcxCustomGridTableItem; out AStyle: TcxStyle); var AColumn: TcxCustomGridTableItem; begin AColumn := (Sender as TcxGridDBTableView).GetColumnByFieldName(‘Email‘); if VarToStr(ARecord.Values[AColumn.Index]) = ‘‘ then AStyle := cxStyleNullEmail; end; ============================================================================== TcxCustomGridTableView.FindItemByName, TcxGridDBTableView.GetColumnByFieldName or TcxGridDBDataController.GetItemByFieldName with cxGrid1DBBandedTableView1.DataController do AValue := Values[FocusedRecordIndex, GetItemByFieldName(‘SomeFieldName‘).Index]; =================================================================== 动态生成BandedView var AView: TcxCustomGridView; begin AView := <cxGrid>.CreateView(TcxGridDBBandedTableView); TcxGridDBBandedTableView(AView).DataController.DataSource := <DataSource>; TcxGridDBBandedTableView(AView).Bands.Add; with TcxGridDBBandedTableView(AView).Bands.Add do begin Visible := False; FixedKind := fkLeft; end; TcxGridDBBandedTableView(AView).DataController.CreateAllItems; <cxGridLevel>.GridView := AView; 此楼回复Re: -------------------------------------------------------------------------------- ====================================================================== 当底层数据集为空时显示一条空记录 procedure <Form>.<cxGrid>Enter(Sender: TObject); var View: TcxGridDBTableView; begin View := TcxGridDBTableView((Sender as TcxGrid).FocusedView); if View.DataController.DataSet.IsEmpty then begin View.DataController.DataSet.Append; View.Controller.EditingController.ShowEdit; end; end; ======================================================================= 在当前View插入记录 使用FocusedView属性得到当前焦点View,用View.DataController得到对应的Data Controller, 之后使用Data Controller的方法来操作数据: - Append - Insert - Post - Cancel - DeleteFocused - DeleteSelection 示例: var ARecIndex: Integer; … View.DataController.Append; ARecIndex := View.DataController.FocusedRecordIndex; View.DataController.Values[ARecIndex, SomeItemIndex] := SomeValue; View.DataController.Post; 另外一种方法是使用View.DataController.DataSource.DataSet得到底层数据集后,再用数据集的 方法来操作数据。 ======================================================================== 激活内置编辑控件 1) <aView>.Controller.EditingController.ShowEdit(<aColumn>); 2) <aView>.Controller.EditingController.StartEditShowingTimer(<aColumn>); 3) <aView>.Controller.EditingItem := <aColumn>; 4) <aColumn>.Editing := True; 隐藏内置编辑控件 <aView>.Controller.EditingController.HideEdit(True); =========================================================================== 移除一个分组列 <aColumn>.GroupIndex := -1; <aColumn>.Visible := True; =========================================================================== 保存修改到数据库 procedure <aForm>.FormClose(Sender: TObject; var Action: TCloseAction); begin if (<aGrid>.FocusedView <> nil) and (<aGrid>.FocusedView.DataController.EditState <> []) then <aGrid>.FocusedView.DataController.Post; end; ============================================================================ 设置内置右键菜单 内置右键菜单包括二个菜单:cxGridStdHeaderMenu, TcxGridStdFooterMenu uses cxGridStdPopupMenu; procedure TForm1.cxGridPopupMenu1Popup(ASenderMenu: TComponent; AHitTest: TcxCustomGridHitTest; X, Y: Integer; var AllowPopup: Boolean); begin if ASenderMenu is TcxGridStdHeaderMenu then TcxGridStdHeaderMenu(ASenderMenu).OnPopup := StdHeaderMenuPopup; end; procedure TForm1.StdHeaderMenuPopup(Sender: TObject); var I: Integer; begin with TcxGridStdHeaderMenu(Sender).Items do for I := 0 to Count - 1 do if Items[I].Caption = ‘Group By Box‘ then begin Items[I].Enabled := False; System.Break; end end; =========================================================================== 得到选中记录的值 1) View.DataController.DataModeController.GridMode = False时 RecIdx := View.Controller.SelectedRecords[i].RecordIndex; ColIdx := View.DataController.GetItemByFieldName(AFieldName).Index; OutputVal := View.DataController.Values[RecIdx, ColIdx]; //RecID := View.DataController.GetRecordId(RecIdx); //OutputVal := ADataSet.Lookup(View.DataController.KeyFieldNames, RecID, AFieldName); 2) View.DataController.DataModeController.GridMode = True时 Bkm := View.DataController.GetSelectedBookmark(ASelectedRecordIndex); if ADataSet.BookmarkValid(TBookmark(Bkm)) then begin ADataSet.Bookmark := TBookmark(Bkm); OutputVal := ADataSet.FieldByName(AFieldName).Value; end; View.BeginUpdate; View.DataController.BeginLocate; try // make changes here… finally View.DataController.EndLocate; View.EndUpdate; end; ============================================================= 在GridMode禁用内置的右键Footer菜单 uses cxGridStdPopupMenu; procedure cxGridPopupMenuOnPopup(...) begin if (ASenderMenu is TcxGridStdFooterMenu) and <GridView>.DataController.DataModeController.GridMode then AllowPopup := False; end; ============================================================== 主从表任何时候只能展开一个组 procedure TForm1.ADetailDataControllerCollapsing( ADataController: TcxCustomDataController; ARecordIndex: Integer; var AAllow: Boolean); var I: Integer; C: Integer; begin AAllow := False; C := 0; for I := 0 to ADataController.RecordCount - 1 do begin if ADataController.GetDetailExpanding(I) then Inc(C); if C > 1 then AAllow := True; end; end; procedure TForm1.ADetailDataControllerExpanding( ADataController: TcxCustomDataController; ARecordIndex: Integer; var AAllow: Boolean); begin ADataController.CollapseDetails; end; procedure TForm1.FormCreate(Sender: TObject); begin cxGrid1DBTableView1.DataController.OnDetailExpanding := ADetailDataControllerExpanding; cxGrid1DBTableView1.DataController.OnDetailCollapsing := ADetailDataControllerCollapsing; end; ================================================================= 动态创建层次(Level)和视图(View) var Grid: TcxGrid; Level: TcxGridLevel; View: TcxGridDBTableView; begin // Creates a Grid instance Grid := TcxGrid.Create(SomeOwner); Grid.Parent := SomeParent; // Creates a Level Level := Grid.Levels.Add; Level.Name := ‘SomeLevelName‘; // Creates a View View := Grid.CreateView(TcxGridDBTableView) as TcxGridDBTableView; View.Name := ‘SomeViewName‘; // … and binds it to the Level Level.GridView := View; // Hooks up the View to the data View.DataController.DataSource := SomeDataSource; // … and creates all columns View.DataController.CreateAllItems; end; 此楼回复Re: -------------------------------------------------------------------------------- ====================================================================== 获得Group Footer合计行对应的记录 procedure TForm1.cxGrid1DBTableView1CustomDrawFooterCell( Sender: TcxGridTableView; ACanvas: TcxCanvas; AViewInfo: TcxGridColumnHeaderViewInfo; var ADone: Boolean); var ALevel, ADataGroupIndex: Integer; AGridRecord, AGroupRecord: TcxCustomGridRecord; begin if AViewInfo is TcxGridRowFooterCellViewInfo and // Row footer (TcxGridDBColumn(AViewInfo.Column).DataBinding.FieldName = ‘Area‘) then // Area column begin AGridRecord := TcxGridRowFooterCellViewInfo(AViewInfo).GridRecord; ALevel := TcxGridRowFooterCellViewInfo(AViewInfo).Container.GroupLevel; ADataGroupIndex := Sender.DataController.Groups.DataGroupIndexByRowIndex[AGridRecord.Index]; if ADataGroupIndex <> -1 then begin AGroupRecord := AGridRecord; while AGroupRecord.Level <> ALevel do AGroupRecord := AGroupRecord.ParentRecord; AViewInfo.Text := AGroupRecord.DisplayTexts[0]; end; end; end; =========================================================================== 访问过滤之后的记录 var I: Integer; begin Memo1.Lines.Clear; with cxGrid1DBTableView1.DataController do for I := 0 to FilteredRecordCount - 1 do Memo1.Lines.Add(DisplayTexts[FilteredRecordIndex[I], 0]); end; ============================================================================ 获得单元的Font cxGrid1DBTableView1.ViewInfo.RecordsViewInfo.Items[1].GetCellViewInfoByItem( cxGrid1DBTableView1Company).EditViewInfo.Font; ============================================================================ 根据Level名称找到Level对象 function GetLevelByName(AGrid: TcxGrid; ALevelName: string): TcxGridLevel; function LoopThroughLevels(ALevel: TcxGridLevel; ALevelName: string): TcxGridLevel; var I: Integer; begin Result := nil; for I := 0 to ALevel.Count - 1 do begin if ALevel[I].Name = ALevelName then begin Result := ALevel[I]; Exit; end; if ALevel[I].Count > 0 then begin Result := LoopThroughLevels(ALevel[I], ALevelName); if Result <> nil then Exit; end; end; end; var I: Integer; begin Result := nil; for I := 0 to AGrid.Levels.Count - 1 do begin if AGrid.Levels[I].Name = ALevelName then begin Result := AGrid.Levels[I]; Exit; end; if AGrid.Levels[I].Count > 0 then begin Result := LoopThroughLevels(AGrid.Levels[I], ALevelName); if Result <> nil then Exit; end; end; end; ============================================================================ 指定Filter Builder打开/保存过滤文件的默认路径 uses ..., cxFilterControlDialog; procedure TForm.GridView1FilterControlDialogShow( Sender: TObject); begin TfmFilterControlDialog(Sender).OpenDialog.InitialDir := ‘D:\‘ end; ============================================================================ 保存/恢复带汇总行的布局 <TableView>.StoreToIniFile(‘c:\Grid.ini‘, True, [gsoUseSummary]); <GridView>.RestoreFromIniFile(<inifilename>,True,False {or True, optional},[gsoUseSummary]); ============================================================================ 取消过滤时移到第一行 uses cxCustomData; procedure TYour_Form.AViewDataControllerFilterChanged(Sender: TObject); var Filter: TcxDataFilterCriteria; begin with Sender as TcxDataFilterCriteria do if IsEmpty then DataController.FocusedRowIndex := 0; end; ============================================================================= 排序后移到第一行 可以设置DataController.Options.FocusTopRowAfterSorting := True,也可以使用如下的代码: uses cxCustomData; procedure TYour_Form.Your_ViewDataControllerSortingChanged(Sender: TObject); begin TcxCustomDataController(Sender).FocusedRowIndex := 0; end; ============================================================================== 判断当前行是否第一行或最后一行 可以使用DataController的IsBOF, IsEOF方法,或者: <AView>.Controller.Controller.FocusedRow.IsFirst <AView>.Controller.Controller.FocusedRow.IsLast ============================================================================== 根据指定值查找记录 DataController提供了好几个方法来得到指定值对应的RecordIndex 对于Bound View可以使用FindRecordIndexByKeyValue方法 =============================================================================== 编辑和显示Blob字段 该字段的Properties设置为BlobEdit,并将BlobPaintStyle 属性设为 bpsText =============================================================================== 得到可见行数 <View>.ViewInfo.VisibleRecordCount =============================================================================== 保存后的行设置为当前行 const CM_SETFOCUSEDRECORD = WM_USER + 1002; type TForm1 = class(TForm) cxGrid1DBTableView1: TcxGridDBTableView; cxGrid1Level1: TcxGridLevel; cxGrid1: TcxGrid; dxMemData1: TdxMemData; dxMemData1Field1: TStringField; dxMemData1Field2: TIntegerField; DataSource1: TDataSource; cxGrid1DBTableView1RecId: TcxGridDBColumn; cxGrid1DBTableView1Field1: TcxGridDBColumn; cxGrid1DBTableView1Field2: TcxGridDBColumn; Timer1: TTimer; CheckBox1: TCheckBox; procedure Timer1Timer(Sender: TObject); procedure dxMemData1AfterPost(DataSet: TDataSet); procedure CheckBox1Click(Sender: TObject); private procedure CMSetFocusedRecord(var Msg: TMessage); message CM_SETFOCUSEDRECORD; public { Public declarations } end; var Form1: TForm1; FocusedIdx: Integer; implementation {$R *.dfm} procedure TForm1.Timer1Timer(Sender: TObject); begin dxMemData1.AppendRecord([‘‘, IntToStr(Random(1000)), Random(1000)]); end; procedure TForm1.dxMemData1AfterPost(DataSet: TDataSet); begin PostMessage(Handle, CM_SETFOCUSEDRECORD, Integer(cxGrid1DBTableView1), MakeLParam(cxGrid1DBTableView1.Controller.FocusedRowIndex, cxGrid1DBTableView1.Controller.TopRowIndex)); end; procedure TForm1.CMSetFocusedRecord(var Msg: TMessage); begin TcxGridDBTableView(msg.WParam).Controller.FocusedRowIndex := Msg.LParamLo; TcxGridDBTableView(msg.WParam).Controller.TopRowIndex := Msg.LParamHi; end; procedure TForm1.CheckBox1Click(Sender: TObject); begin Timer1.Enabled := TCheckBox(Sender).Checked; end; end. ================================================================================= 删除记录并获得焦点 procedure TForm1.BtnDeleteClick(Sender: TObject); var FocusedRow, TopRow: Integer; View: TcxGridTableView; DataController: TcxGridDataController; begin View := cxGrid1.FocusedView as TcxGridTableView; DataController := View.DataController; // Remember the top row (the vertical scrollbar position) TopRow := View.Controller.TopRowIndex; // Remember the focused row(!) index FocusedRow := DataController.FocusedRowIndex; DataController.DeleteFocused; // After deletion the same row must be focused, // although it will correspond to a different data record DataController.FocusedRowIndex := FocusedRow; // Restore the top row View.Controller.TopRowIndex := TopRow; end; //======================================================================================= 数据库中的财务表为: ID 收支类型 金额 其它属性 其中收支类型只有两种值:0 表示收入,1 表示支出 ;金额都是正数。 设置cxGrid的Footer 可以使得在显示时,列表的下方出现汇总行:“金额”的和 同样设置Default For Groups可以使得在用户拖动表头属性实现分组时,显示组内的汇总行:“金额”的和。 上面说的,用过cxGrid应该都会,下面就有这么一个问题 如果我想使汇总行的值变为如下的值应该怎样实现: 收支类型为0的金额的和 - 收支类型为1的金额的和 实现Footer的功能好办,因为它的值不会变,自己用循环写一个就完了,但是Default For Groups的功能就不好说了,因为它的值是根据用户拖动的属性计算的,而且还有可能是多层分组,想不出来了,所有到这来问 是不是要设置什么属性?或者cxGrid根本就没这个功能,那该用什么方法解决?希望哪位帮我解决,谢谢了先! 给你一个例子,可能对你有帮助, with tvOrders.DataController.Summary do begin BeginUpdate; try SummaryGroups.Clear; //The first summary group with SummaryGroups.Add do begin //Add proposed grouping column(s) TcxGridTableSummaryGroupItemLink(Links.Add).Column := tvOrdersCustomerID; //Add summary items with SummaryItems.Add as TcxGridDBTableSummaryItem do begin Column := tvOrdersPaymentAmount; Kind := skSum; Format := ‘Amount Paid: $,0‘; end; with SummaryItems.Add as TcxGridDBTableSummaryItem do begin Column := tvOrdersPaymentAmount; Kind := skCount; Format := ‘Records: 0‘; end; end; //The second summary group with SummaryGroups.Add do begin //Add proposed grouping column(s) TcxGridTableSummaryGroupItemLink(Links.Add).Column := tvOrdersProductID; //Add summary items with SummaryItems.Add as TcxGridDBTableSummaryItem do begin Column := tvOrdersQuantity; Kind := skSum; Position := spFooter; Format := ‘TOTAL = 0‘; end; with SummaryItems.Add as TcxGridDBTableSummaryItem do begin Column := tvOrdersPurchaseDate; Kind := skMin; Position := spFooter; end; end; finally EndUpdate; end; end; 2007-7-19 12:56:41 go on 订单号 商品名 单价 数量 金额 001 aa 11.00 2 22.00 001 bb 2.00 2 4.00 001 cc 3.00 3 9.00 ----------------------合计 7 35.00 002 ee 11.00 2 22.00 002 bb 3.00 2 6.00 002 cc 3.00 3 9.00 ----------------------合计 7 37.00 总计14 72.00 每个单号分一个小结,能实现吗? 最后在底下实现总的合计
以上是关于cxGrid用法-最新的主要内容,如果未能解决你的问题,请参考以下文章