Delphi CxGrid 汇总（3）

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

[delphi] view 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：

[delphi] view 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：

[delphi] view 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：

[delphi] view 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：

[delphi] view 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;

转载于:https://www.cnblogs.com/jupt/p/3922932.html

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