Re: [Foxgui-users]Scrolling wave view

[Davy D. <dd...@ne...>]

jeroen wrote:

> ....
> If we were selecting, call startAutoScroll().  This tests if we're close to the
> edge.  If startAutoScroll() returns TRUE then simply return.  Otherwise, we're
> not close to the edge and you should process the mouse coords to select the
> appropriate audio samples.
>
>   long onAutoScroll(FXObject*,FXSelector,void*);
>
> This handler is a kind-of mouse moved message issued while the mouse is more-or-less
> standing still near an edge. The implementation should call FXScrollArea::onAutoScroll()
> then perform similar code as in onMotion() to select audio samples.

Hi, thanx for the quick reply last night. The information has been most helpful.  However,
I have a question about autoscrolling, then even handlers in general.

   I'm trying to implement auto scrolling.   I did what you said about calling
startAutoScroll in my mouse move event handler.. if startAutoScroll returns TRUE then
I just return then expecting that onAutoScroll is about to be invoked which will do the
work that would have been done in the remaining login in onMotion...
   However, I noticed that FXScrollArea::onAutoScroll was not virtual (nor defined virtual
in any base class that I could tell) so I couldn't just simply override
FXScrollArea::onAutoScroll to get the event...  So I added an event handler for
[SEL_TIMEOUT, FXWindow::ID_AUTOSCROLL, FXWaveView::onAutoScroll] in my function map...
Then I remember that you said to call FXScrollArea::onAutoScroll in my handler (which
initialially sounded like I should override it)...   So adding an event handler *REPLACES*
the current one?  Why not just make all the handlers in the base class virtual so I could
just override them? (BeOS's C++ API sort of works this way if I remember)...

Thanks again,
  Davy