列
解决:
<aColumn>.GroupIndex := -1;
<aColumn>.Visible := True;
****************************************************************************
39 保存修改到数据库
解决:
procedure <aForm>.FormClose(Sender: TObject; var Action: TCloseAction);
begin
if (<aGrid>.FocusedView <> nil)
and (<aGrid>.FocusedView.DataController.EditState <> []) then
<aGrid>.FocusedView.DataController.Post;
end;
****************************************************************************
40 设置内置右键菜单
解决:
内置右键菜单包括二个菜单:cxGridStdHeaderMenu, TcxGridStdFooterMenu
plaincopy
- 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;
****************************************************************************
41 得到选中记录的值
解决:
plaincopy
- 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;
****************************************************************************
42 在GridMode禁用内置的右键Footer菜单
解决:
uses cxGridStdPopupMenu;
procedure cxGridPopupMenuOnPopup(...)
begin
if (ASenderMenu is TcxGridStdFooterMenu) and
<GridView>.DataController.DataModeController.GridMode then
AllowPopup := False;
end;
****************************************************************************
43 主从表任何时候只能展开一个组
解决:
plaincopy
- procedure TForm1.ADetailDataControllerCollapsin( 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;
- ****************************************************************************
- 44 动态创建层次(Level)和视图(View)
- 解决:
- 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;
****************************************************************************
45 获得Group Footer合计行对应的记录
解决:
plaincopy
- 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;
****************************************************************************
46 访问过滤之后的记录
解决:
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;
****************************************************************************
47 获得单元的Font
解决:
cxGrid1DBTableView1.ViewInfo.RecordsViewInfo.Items[1].GetCellViewInfoByItem(
cxGrid1DBTableView1Company).EditViewInfo.Font;
****************************************************************************
48 根据Level名称找到Level对象
解决:
plaincopy
- 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;
****************************************************************************
49 指定Filter Builder打开/保存过滤文件的默认路径
解决:
uses
..., cxFilterControlDialog;
procedure TForm.GridView1FilterControlDialogShow(
Sender: TObject);
begin
TfmFilterControlDialog(Sender).OpenDialog.InitialDir := 'D:/'
end;