ddhdbwf.pas

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unit DdhDbwF;

interface

uses
  SysUtils, Windows, Messages, Classes, Graphics, Controls,
  Forms, Dialogs, StdCtrls, ExtCtrls, Grids, DB, DBTables,
  Buttons, Mask, DBCtrls;

type
  TFormDbWiz = class(TForm)
    Notebook1: TNotebook;
    Label1: TLabel;
    ListDatabases: TListBox;
    BitBtnNext1: TBitBtn;
    BitBtnNext2: TBitBtn;
    Label2: TLabel;
    ListTables: TListBox;
    BitBtnBack2: TBitBtn;
    ListFields: TListBox;
    Label3: TLabel;
    BitBtnNext3: TBitBtn;
    BitBtnBack3: TBitBtn;
    Label4: TLabel;
    BitBtnNext4: TBitBtn;
    BitBtnBack4: TBitBtn;
    GroupFilter: TRadioGroup;
    BitBtnAll: TBitBtn;
    BitBtnNone: TBitBtn;
    StringGrid1: TStringGrid;
    Table1: TTable;
    procedure Notebook1PageChanged(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure ListDatabasesClick(Sender: TObject);
    procedure BitBtnNext1Click(Sender: TObject);
    procedure ListTablesClick(Sender: TObject);
    procedure BitBtnBack2Click(Sender: TObject);
    procedure BitBtnNext2Click(Sender: TObject);
    procedure BitBtnBack3Click(Sender: TObject);
    procedure BitBtnAllClick(Sender: TObject);
    procedure BitBtnNoneClick(Sender: TObject);
    procedure BitBtnNext3Click(Sender: TObject);
    procedure BitBtnBack4Click(Sender: TObject);
    procedure ListFieldsClick(Sender: TObject);
    procedure BitBtnNext4Click(Sender: TObject);
  private
    { Private declarations }
  public
    SourceCode, FormName, UnitName: string;
    ResultForm: TForm;
    procedure GeneratedFormClose (
      Sender: TObject; var Action: TCloseAction);
  end;

var
  FormDbWiz: TFormDbWiz;

implementation

{$R *.DFM}

uses
  DdhDynDb, ExptIntf;

////// form code //////

procedure TFormDbWiz.Notebook1PageChanged(Sender: TObject);
begin
  // copy the name of the page into the caption
  Caption := Format (
    'Ddh DB Form Wizard - Page %d/%d: ',
    [NoteBook1.PageIndex + 1,
    NoteBook1.Pages.Count,
    NoteBook1.ActivePage]);
end;

procedure TFormDbWiz.FormCreate(Sender: TObject);
begin
  // fill the first listbox with database names
  Session.GetDatabaseNames (
    ListDatabases.Items);
  // start in the first page
  Notebook1.PageIndex := 0;
  // default values (modified by the wizard)
  FormName := 'TResultForm';
  UnitName := 'ResultUnit';
end;

procedure TFormDbWiz.ListDatabasesClick(Sender: TObject);
begin
  // database selected: enable the Next button
  BitBtnNext1.Enabled := True;
end;

procedure TFormDbWiz.BitBtnNext1Click(Sender: TObject);
var
  CurrentDB, CurrentFilter: string;
begin
  // get the database and filters
  CurrentDB := ListDatabases.Items [
    ListDatabases.ItemIndex];
  CurrentFilter := GroupFilter.Items [
    GroupFilter.ItemIndex];
  // retrieve the tables
  Session.GetTableNames (CurrentDB,
    CurrentFilter, True, False, ListTables.Items);
  // move to the next page
  NoteBook1.PageIndex := 1;
  BitBtnNext2.Enabled := False;
end;

procedure TFormDbWiz.ListTablesClick(Sender: TObject);
begin
  // table selected: enable next button
  BitBtnNext2.Enabled := True;
end;

procedure TFormDbWiz.BitBtnBack2Click(Sender: TObject);
begin
  // go back to first page
  NoteBook1.PageIndex := 0;
end;

procedure TFormDbWiz.BitBtnNext2Click(Sender: TObject);
var
  I: Integer;
begin
  // set the properties of the selected table
  with Table1 do
  begin
    DatabaseName := ListDatabases.Items[
      ListDatabases.ItemIndex];
    TableName := ListTables.Items[
      ListTables.ItemIndex];
    // load the field definitions
    FieldDefs.Update;
  end;
  // clear the list box, then fill it
  ListFields.Clear;
  for I := 0 to Table1.FieldDefs.Count - 1 do
    // add number, name, and class name of each field
    ListFields.Items.Add (Format (
      '%d) %s [%s]',
      [Table1.FieldDefs[I].FieldNo,
      Table1.FieldDefs[I].Name,
      Table1.FieldDefs[I].FieldClass.ClassName]));
  // move to the next page
  NoteBook1.PageIndex := 2;
  BitBtnNext3.Enabled := False;
end;

procedure TFormDbWiz.BitBtnBack3Click(Sender: TObject);
begin
  // back to the second page
  NoteBook1.PageIndex := 1;
end;

procedure TFormDbWiz.BitBtnAllClick(Sender: TObject);
var
  I: Integer;
begin
  // select every available field
  for I := 0 to ListFields.Items.Count - 1 do
    ListFields.Selected [I] := True;
  // enable Next button
  BitBtnNext3.Enabled := True;
end;

procedure TFormDbWiz.BitBtnNoneClick(Sender: TObject);
var
  I: Integer;
begin
  // deselect all the fields
  for I := 0 to ListFields.Items.Count - 1 do
    ListFields.Selected [I] := False;
  // disable next button (no fields are selected)
  BitBtnNext3.Enabled := False;
end;

procedure TFormDbWiz.ListFieldsClick(Sender: TObject);
begin
  // enable button if there at least one field selected
  BitBtnNext3.Enabled := ListFields.SelCount > 0;
end;

procedure TFormDbWiz.BitBtnNext3Click(Sender: TObject);
var
  I, RowNum: Integer;
begin
  // reserve enough rows in the string grid
  StringGrid1.RowCount := ListFields.Items.Count;
  // empty the string grid
  for I := 0 to StringGrid1.RowCount - 1 do
  begin
    StringGrid1.Cells [0, I] := '';
    StringGrid1.Cells [1, I] := '';
  end;
  // for each field, if selected list it with the
  // corresponding data aware component
  RowNum := 0;
  for I := 0 to ListFields.Items.Count - 1 do
    if ListFields.Selected [I] then
    begin
      StringGrid1.Cells [0, RowNum] := Format ('%d) %s [%s]',
        // field number, name, classname of data aware control
        [Table1.FieldDefs[I].FieldNo,
        Table1.FieldDefs[I].Name,
        ConvertClass(Table1.FieldDefs[I].FieldClass).ClassName]);
      StringGrid1.Cells [1, RowNum] := Table1.FieldDefs[I].Name;
      Inc (RowNum);
    end;
  // set the real number of rows
  StringGrid1.RowCount := RowNum;
  NoteBook1.PageIndex := 3;
end;

procedure TFormDbWiz.BitBtnBack4Click(Sender: TObject);
begin
  NoteBook1.PageIndex := 2;
end;

// generate button
procedure TFormDbWiz.BitBtnNext4Click(Sender: TObject);
var
  StrList: TStringList;
  I, RowNum: Integer;
begin
  StrList := TStringList.Create;
  Screen.Cursor := crHourGlass;
  try
    RowNum := 0;
    for I := 0 to ListFields.Items.Count - 1 do
      if ListFields.Selected [I] then
      begin
        StrList.AddObject (
          StringGrid1.Cells [1, RowNum], TObject (I));
        // move to next row in string grid
        Inc (RowNum);
      end;
    ResultForm := GenerateForm (StrList, Table1);
    if not Assigned (ToolServices) then
    begin
      // stand alone form
      ResultForm.OnClose := GeneratedFormClose;
      ResultForm.Show;
    end
    else
    begin
      // wizard
      SourceCode := GenerateSource (ResultForm,
        FormName, UnitName);
      ModalResult := mrOK;
    end;
  finally
    Screen.Cursor := crDefault;
    StrList.Free;
  end;
end;

procedure TFormDbWiz.GeneratedFormClose(
  Sender: TObject; var Action: TCloseAction);
begin
  Action := caFree;
end;

end.