TDateTimePicker Delphi 7 - BUG using XPManifest

Posted on 2004-08-13
Last Modified: 2007-12-19
Hi Chaps,

I've found a very bad problem with the TDateTimePicker that I think borland should know about (don't know how to report it).

(Using Delphi 7 and Windows XP)

Try the following.

- Create a new application.
- On the form place the following...
- 1 dateTimePicker
- 2 Buttons
- 1 Edit Box
- 1 XP Manifect Component

Now create the following events.

- OnFormCreate
- Button1Click
- Button2Click
- DateTimePicker1Exit

Place in the following code...

procedure TForm1.DateTimePicker1Exit(Sender: TObject);
      Edit1.Text := DateToStr(DateTimePicker1.DateTime);

procedure TForm1.Button1Click(Sender: TObject);
   DateTimePicker1.DateTime := StrToDate('02/01/2004');

procedure TForm1.FormCreate(Sender: TObject);
      DateTimePicker1.DateTime := StrToDate('02/01/2004');

procedure TForm1.Button2Click(Sender: TObject);

Ok, here is the problem.  The DateTimePicker does not seem to fire it's internal change event sometimes when using the XP skin.

Example 1.

- Run the application
- Click Button 1
- (Edit1's text will say '02/01/2004') ......{or whatever regional format you have set up}
- Click in the datetimepicker on the first digit and press the down arrow key to change it to '01/01/2004'
- Click Button 1
- (Edit1's text will say '01/01/2004')
- Click in the datetimepicker on the first digit and press the down arrow key to change it to '01/01/2004' (again)
- Click Button 2 this time (button 2 has no code and it's only used to demonstrate loosing focus from the datetimepicker)

- Edit 1's text will now say 02/01/2004 when the date is actually saying 01/01/2004, which is obvisouly very wrong.

Example 2.

- Run the application
- Click the down arrown on the DTPicker.
- Click the red today box
- (DTPicker changes to show todays date)
- Click button 1
- (DTPicker changes to show '02/01/2004')
- Click the down arrown on the DTPicker.
- Click the red today box

- DTPicker STILL says 02/01/2004

Again this is obvisouly wrong.

If you take off the XPManifest control and remove XPMan from the uses at the top of the unit the control works fine!!

The question :

Does anyone have any code that fixes these bugs and does borland know about them?


In ComCtrls we found that changing the top part of the CNNotify of the DTPicker control to the following fixes my 'Example 2' bug but we don't have a fix for 'Example 1' yet.

- code fix for example 2.

procedure TDateTimePicker.CNNotify(var Message: TWMNotify);
  DT: TDateTime;
  AllowChange: Boolean;
  ST: TSystemTime;
  with Message, NMHdr^ do
    Result := 0;
    case code of
          FDroppedDown := False;

          DateTime_GetSystemTime(Handle, ST);
          DT := SystemTimeToDateTime(st);
          if Kind = dtkDate then
          if FShowCheckbox then FChecked := True;

          if Assigned(FOnCloseUp) then FOnCloseUp(Self);


Many Thanks
Question by:WoodyJ007
LVL 12

Expert Comment

ID: 11797803
Can be downloaded this TXPManifest for free ?

Author Comment

ID: 11807515
XPManifest is a standard borland component in Delphi 7.  It's under the Win32 tab.

Accepted Solution

modulo earned 0 total points
ID: 13404432
PAQed with points refunded (500)

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