cxGrid功能_用于备查【转】
好久没有写笔记了,现在有点时间,来篇。
happycyp 2007-7-19
cxGrid功能强大,适合做企业级的复杂查询。非常方便。
但是对其用法介绍的并不多,在此总结他人的使用经验和自己的一点小经验,供大家参考。
(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
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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);
后面的版本:
cxgrid 导出数据 USES cxTLExportlink,//CXDBTREELIST导出文件引用单元 cxgridExportlink,//CXgrid导出文件引用单元 cxExportPivotGridLink; procedure CXGRIDToFile(VAR GOTGrid:TCXGRID;GOFILE:INTEGER); BEGIN case gofile of 0:dm.SaveDialog.Filter:='EXCEL文件|*.xls'; 1:dm.SaveDialog.Filter:='文本文件|*.TXT'; 2:dm.SaveDialog.Filter:='HTML文件|*.HTML'; END; if dm.SaveDialog.Execute then BEGIN case gofile of 0:ExportGridToEXCEL(dm.SaveDialog.FileName,GOTGrid,TRUE,TRUE); 1:ExportGridToTEXT(dm.SaveDialog.FileName,GOTGrid,TRUE,TRUE); 2:ExportGridToHTML(dm.SaveDialog.FileName,GOTGrid,TRUE,TRUE); end; Application.MessageBox('文件已保存','系统提示',48); END; END; //CXDBTREELIST导出文件 procedure CXtreeToFile(VAR GOTree:TcxDBTreeList;GOFILE:INTEGER);// begin case gofile of 0:dm.SaveDialog.Filter:='EXCEL文件|*.xls'; 1:dm.SaveDialog.Filter:='文本文件|*.TXT'; 2:dm.SaveDialog.Filter:='HTML文件|*.HTML'; END; if dm.SaveDialog.Execute then BEGIN case gofile of 0:cxExportTLToEXCEL(dm.SaveDialog.FileName,GOTree,TRUE,TRUE); 1:cxExportTLToTEXT(dm.SaveDialog.FileName,GOTree,TRUE,TRUE); 2:cxExportTLToHTML(dm.SaveDialog.FileName,GOTree,TRUE,TRUE); end; Application.MessageBox('文件已保存','系统提示',48); END; end; //交叉表导出文件 procedure cxPivotToFile(VAR GOPivot:TcxDBPivotGrid;GOFILE:INTEGER); VAR FILEP:STRING; begin case gofile of 0:dm.SaveDialog.Filter:='EXCEL文件|*.xls'; 1:dm.SaveDialog.Filter:='文本文件|*.TXT'; 2:dm.SaveDialog.Filter:='HTML文件|*.HTML'; END; if dm.SaveDialog.Execute then BEGIN case gofile of 0:cxExportPivotGridToExcel(pchar(dm.SaveDialog.FileName),GOPivot); 1:cxExportPivotGridToText(pchar(dm.SaveDialog.FileName),GOPivot); 2:cxExportPivotGridToHtml(pchar(dm.SaveDialog.FileName),GOPivot); end; Application.MessageBox('文件已保存','系统提示',48); END; end;
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;
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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
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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。
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没用过
不要经常使用三方控件
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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
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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
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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?
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没用过.....
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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!!
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呵呵
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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
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up
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没用过cxGrid,以后考虑
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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。。。
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路过
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用过,挺好,只会使用最简单的。
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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。
tttk2000@hotmail.com
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第二个问题:https://www.devexpress.com/Support/Center/default.aspx?view=ViewIssue&issueid=B2691
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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。
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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
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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;
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在用,留名
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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;
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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
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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;
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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
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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。
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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
回复人:dctony() ( ) 信誉:100 2007-1-12 21:48:23 得分:100
?
可以的,cxGrid的功能比你想象的还要强大。
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。
ExpressQuantumGrid控件实在是太复杂,太庞大,最好的了解它的方法就是查帮助。
好久没有写笔记了,现在有点时间,来篇。
happycyp 2007-7-19
cxGrid功能强大,适合做企业级的复杂查询。非常方便。
但是对其用法介绍的并不多,在此总结他人的使用经验和自己的一点小经验,供大家参考。
(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;
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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
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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。
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没用过
不要经常使用三方控件
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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
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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
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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?
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没用过.....
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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!!
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呵呵
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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
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up
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没用过cxGrid,以后考虑
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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。。。
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路过
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用过,挺好,只会使用最简单的。
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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。
tttk2000@hotmail.com
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第二个问题:https://www.devexpress.com/Support/Center/default.aspx?view=ViewIssue&issueid=B2691
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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。
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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
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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;
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在用,留名
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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;
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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
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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;
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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
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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。
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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;
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======================================================================
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;
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======================================================================
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
回复人:dctony() ( ) 信誉:100 2007-1-12 21:48:23 得分:100
?
可以的,cxGrid的功能比你想象的还要强大。
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。
ExpressQuantumGrid控件实在是太复杂,太庞大,最好的了解它的方法就是查帮助。