Pascal Super Library/Pascal Super Library (CW International)(1997).bin/BORL_TIP/TI100/TI672.ASC

Text File | 1992-08-12 | 6KB | 331 lines

  PRODUCT  :  Turbo Pascal                           NUMBER  :  672
  VERSION  :  6.0
       OS  :  MS/PC DOS
     DATE  :  August 12, 1992                          PAGE  :  1/5

    TITLE  :  How to Create a Listbox and Get a Double Click




  {

  The following example demonstrates how to create a listbox
  of file items and enable the user to double click on any item.
  This produces a Message Box containing the listbox selected
  item.

  }
  {$X+}
  Program Simple_ListBox;

  Uses
    Objects, Drivers, Views, Menus, Dialogs, App, Crt, Dos, MsgBox;

  Const
   cmNewCollect = 102;

  Type

   TMyApp = object(TApplication)
       Constructor Init;
       Procedure Initstatusline; Virtual;
       Procedure Initmenubar; Virtual;
       Procedure NewCollect; Virtual;
       Procedure HandleEvent(var Event: TEvent); Virtual;
     End;

    PListBox = ^RListBox;
    RListBox = object(TListBox)
      Constructor Init(var Bounds:TRect; ANumCols:Word; AScrollBar:
                           PScrollBar);
      Procedure Process;
      Destructor Done; Virtual;
    End;

    PMyDialog = ^MyDialog;
    MyDialog = object(TDialog)
      Constructor Init(var Bounds: TRect; MyTitle:TTitleStr);
      Destructor Done; Virtual;
      Procedure HandleEvent(var Event: TEvent); Virtual;
    End;

  Var













  PRODUCT  :  Turbo Pascal                           NUMBER  :  672
  VERSION  :  6.0
       OS  :  MS/PC DOS
     DATE  :  August 12, 1992                          PAGE  :  2/5

    TITLE  :  How to Create a Listbox and Get a Double Click




    NameList: PStringCollection;
    PList: ^Rlistbox;
    MyApp: TMyApp;

  Constructor Mydialog.Init(var Bounds:TRect; MyTitle: TTitleStr);
  Begin
    TDialog.Init(Bounds, MyTitle);
  End;

  Destructor Mydialog.Done;
  Begin
    TDialog.Done;
    Dispose(NameList, Done);
  End;

  Procedure MyDialog.HandleEvent(var Event:TEvent);
  var
    Index: integer;
  Begin
    TDialog.HandleEvent(Event);
    if (Event.Double = true) and (Event.What = evNothing) then
      begin
        sound(100);
        delay(100);
        nosound;
        Index:=(PList^.Focused);
        Messagebox(PList^.GetText(Index,20) ,nil, mfOkButton);
      end;
    ClearEvent(Event);
  End;

  Constructor TMyApp.Init;
  Begin
    TApplication.Init;
  End;

  Constructor RListBox.Init(var Bounds:TRect; ANumCols:Word;
  AScrollBar:
                            PScrollBar);
  Begin
    TListBox.Init(Bounds, ANumCols, AScrollBar);
  End;














  PRODUCT  :  Turbo Pascal                           NUMBER  :  672
  VERSION  :  6.0
       OS  :  MS/PC DOS
     DATE  :  August 12, 1992                          PAGE  :  3/5

    TITLE  :  How to Create a Listbox and Get a Double Click




  Destructor RListBox.Done;
  Begin
    TListBox.Done;
  End;

  Procedure TMyApp.InitStatusLine;
  Var
    R:TRect;
  Begin
    GetExtent(R);
    R.A.Y := R.B.Y -1;
    Statusline :=new(PStatusLine, init(R,
    NewStatusDef(0,$FFFF,
    NewStatusKey('~Alt-X~ Exit',kbAltX, cmQuit,
    NewStatusKey('~F10~ Menu',kbF10,cmMenu,
    Nil)),Nil)
    ));
  End;

  Procedure RListBox.Process;
  var
    DirInfo: SearchRec;
  Begin
    NameList:=New(PStringCollection, Init(50,10));
    With NameList^ do
    Begin
      FindFirst('*.*', Archive, DirInfo);
      while DosError = 0 do
        Begin
          Insert(Newstr(Dirinfo.Name));
          FindNext(DirInfo);
        End;
    End;
  End;

  Procedure TMyApp.NewCollect;
  Var
    MyBox: PMyDialog;
    R: TRect;
    PBorland: ^TScrollBar;
    Col: word;
  Begin
    Plist^.Process;













  PRODUCT  :  Turbo Pascal                           NUMBER  :  672
  VERSION  :  6.0
       OS  :  MS/PC DOS
     DATE  :  August 12, 1992                          PAGE  :  4/5

    TITLE  :  How to Create a Listbox and Get a Double Click




    R.Assign(10,10,60,20);
    MyBox := New(PMyDialog, Init(R, 'Scroll Collection'));
    Col:=1;
    R.Assign(40, 1, 41, 9);
    PBorland:= New(PScrollBar, Init(R));
    R.Assign(9, 1, 40, 9);
    Plist:=New(PListbox, Init(R,Col,PBorland));
    Plist^.Newlist(Namelist);
    MyBox^.Insert(PBorland);
    MyBox^.Insert(PList);
    Desktop^.Insert(MyBox);
  End;

  Procedure TMyApp.HandleEvent(var Event: TEvent);
  Begin
    TApplication.HandleEvent(Event);
    if Event.What = evCommand then
      Begin
        case Event.Command of
          cmNewCollect: Newcollect;
        else
          ClearEvent(Event);
          Exit;
        End;
        ClearEvent(Event);
      End;
  End;

  Procedure TMyApp.InitMenubar;
  var
    R: TRect;
  Begin
    GetExtent(R);
    R.B.Y := R.A.Y +1;
    MenuBar :=new(PMenubar, Init(R, Newmenu(
    NewSubMenu('~L~istbox Menu', hcNoContext, Newmenu(
    NewItem('~B~ox','',kbF9, cmnewcollect, hcnocontext,
    NewLine(
    NewItem('~E~xit','', kbf10, cmquit, hcnocontext,
    Nil)))), Nil))));
  End;















  PRODUCT  :  Turbo Pascal                           NUMBER  :  672
  VERSION  :  6.0
       OS  :  MS/PC DOS
     DATE  :  August 12, 1992                          PAGE  :  5/5

    TITLE  :  How to Create a Listbox and Get a Double Click




  Begin
    MyApp.Init;
    MyApp.Run;
    MyApp.Done;
  End.

  DISCLAIMER: You have the right to use this technical information
  subject to the terms of the No-Nonsense License Statement that
  you received with the Borland product to which this information
  pertains.