cxGrid用法-最新

在做AdoHelper实用程序的时候,我用了DevExpress的cxGrid控件.在此之前用的是dbgrid,考虑到不能把所有的数据都拉到本地,我用了动态生成的select top 500的命令.这样很笨.昨天忽然想到,可以看看控件是否支持只拉取一部分数据的,象access那样.

GridView.DataController.DataModeController.GridMode=True;

再设置GridModeBufferCount为200,实地运行的结果很好.如果此项置0,也没关系,cxGrid会自动设置一个大约180左右的分页值.

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当设置gridmode=true时,则在cxGrid上设置的filtering,sorting,footer中的合计信息均无效 --待验证

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cxGrid 有一个 SmartRefresh这个一个属性,我看了源码,当设为True时,那么在View获得或者更新数据时,先会 DataSet.DesableControls;完了之后再DataSet.EnableControls,不信你设一下,速度会快很多.

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自己用的 cxGrid用法:

http://www.winu.cn/space.php?uid=14160&do=blog&id=451



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&raquo;&raquo;&raquo; 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
 
05-04 11:43