Bug in TWBrowse scrollbar

[Enrico Maria Giordano]

This is the sample:

Code: Select all  Expand view  RUN

#include "Fivewin.ch"


FUNCTION MAIN()

    LOCAL oDlg, oBrw

    USE TEST

    DEFINE DIALOG oDlg

    @ 0, 0 LISTBOX oBrw FIELDS

    ACTIVATE DIALOG oDlg;
             ON INIT oDlg:SetControl( oBrw );
             CENTER

    CLOSE

    RETURN NIL

Try to press CTRL-C or CTRL-R and you will see that the scrollbar thumb will move, respectively, down and up (while the highlight bar keep holding on the first record).

EMG

[Enrico Maria Giordano]

Solved! Replace

Code: Select all  Expand view  RUN

METHOD KeyChar( nKey, nFlags ) CLASS TWBrowse

   do case
      case nKey == K_PGUP
           ::oVScroll:PageUp()

      case nKey == K_PGDN
           ::oVScroll:PageDown()

      otherwise
           return Super:KeyChar( nKey, nFlags )
   endcase

return 0

with

Code: Select all  Expand view  RUN

METHOD KeyChar( nKey, nFlags ) CLASS TWBrowse

   do case
      case nKey == VK_PRIOR
           ::oVScroll:PageUp()

      case nKey == VK_NEXT
           ::oVScroll:PageDown()

      otherwise
           return Super:KeyChar( nKey, nFlags )
   endcase

return 0

EMG

[Enrico Maria Giordano]

Or, even better, just remove KeyChar method from TWBrowse class. It seems not needed.

EMG

[Antonio Linares]

Enrico,

>
Try to press CTRL-C or CTRL-R and you will see that the scrollbar thumb will move, respectively, down and up (while the highlight bar keep holding on the first record).
>

We have removed Class TWBrowse Method KeyChar() following your advise, thanks. Tested in Vista but when Ctrl+C or Ctrl+R are pressed nothing happens (edited: same behavior in XP). Maybe that behavior is not implemented in Vista.

[Enrico Maria Giordano]

I don't know why you can't replicate the problem but try this:

Code: Select all  Expand view  RUN

METHOD KeyChar( nKey, nFlags ) CLASS TWBrowse

   do case
      case nKey == K_PGUP
           ::oVScroll:PageUp()
? nKey, K_PGUP
      case nKey == K_PGDN
           ::oVScroll:PageDown()
? nKey, K_PGDN
      otherwise
           return Super:KeyChar( nKey, nFlags )
   endcase

return 0

Don't you see the same value for nKey and for K_PGUP or K_PGDN?

Try with few records.

EMG

[Antonio Linares]

Enrico,

We removed Method KeyChar() following your advise and everything seems to work fine. Anyhow Ctrl+C and Ctrl+R do nothing here.

What are those keystrokes intended for ?

[Enrico Maria Giordano]

Are you saying that the KeyChar method is not invoked when you press CTRL-C or CTRL-R? It is invoked here. Anyway, CTRL-C and CTRL-R is not intended for anything. Just they caused the scrollbar to move due to the typo K_PGUP/K_PGDN (Clipper keys) instead of VK_PRIOR/VK_NEXT (Windows keys). That's all.

EMG

[Antonio Linares]

Enrico,

I see. Well as we have removed Method KeyChar() then it should be fine now

[Enrico Maria Giordano]

Yes, thank you.

EMG