testeditdetailform.pas

delphi编程控件

unit TestEditDetailForm;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  Buttons, DB, DBTables, Grids, ComCtrls, DBGrids, DBCGrids, ExtCtrls, DBCtrls,
  StdCtrls, Mask, dbTree, TestSelectForm, TreeVwEx;

type
  TfrmEditDetail = class(TForm)
    Table1: TTable;
    DataSource1: TDataSource;
    DBTreeView1: TDBTreeView;
    Table1ID: TIntegerField;
    Table1Parent: TIntegerField;
    Table1Text: TStringField;
    DBNavigator1: TDBNavigator;
    BitBtn1: TBitBtn;
    Label1: TLabel;
    procedure FormCreate(Sender: TObject);
    procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
  end;

var
  frmEditDetail: TfrmEditDetail;

implementation

{$R *.DFM}

procedure OpenTable(Table: TTable);
var
  TableName: String;
begin
  if Table.Active then
    exit;
  if (Table.DatabaseName = '') then
  begin
    TableName := Table.TableName;
    if (Pos('.DB', UpperCase(TableName)) = 0) then
      TableName := TableName + '.DB';
    if FileExists(ExtractFilePath(Application.ExeName) +
                  TableName) then
      Table.DatabaseName := ExtractFileDir(Application.ExeName)
    else
    begin
      ShowMessage(
        'Please set ' + Table.Name + '.DatabaseName to the location of ' +
        TableName + ' or copy ' + TableName +
        ' to the location of ' + Application.ExeName);
      halt;
    end;
  end;
  Table.Open;
end;

procedure TfrmEditDetail.FormCreate(Sender: TObject);
begin
  try
    OpenTable(Table1);
  finally
  { We better stop the demo if something is wrong: }
    if not (Table1.Active) then
      halt;
  end;
end;

procedure TfrmEditDetail.FormCloseQuery(Sender: TObject;
  var CanClose: Boolean);
begin
  with Table1 do
    if (State in [dsEdit, dsInsert]) then
      case MessageDlg('Save changes ?', mtConfirmation, mbYesNoCancel, 0) of
        mrYes: Post;
        mrNo: Cancel;
        else CanClose := false;
      end;
end;

end.