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On 8/15/22 09:56 geert karman wrote:
>
I attach my modified version of ScrollB which provides the
behavior I
> think you want. I moved the invocation of move_to()
outside the
> Scroll_B::draw()
> method, into a callback function for ScrollB's vertical
scrollbar.
Excellent!
Without checking the code in detail or testing it myself (I
only read your code quickly), this is generally how it should
be done.
Thanks for investigating and helping!
Great! works fine, many thanks. I was looking for a way to
intercept the scrolling of the Fl_Scroll and only thought of
the draw() function. It is of course much better to provide my
own version of the callback() of the scrollbar.
I'm glad this works for you.
On a further note, I was also trying to get my own
scrollbars into an Fl_Scroll widget, but that looks like it
cannot be done?
No, this can't be done. Fl_Scroll has two embedded Fl_Scrollbar
widgets and uses these exclusively. Unfortunately Fl_Scroll exposes
the embedded scrollbars in its public interface which means there's
no way to change this, hence you can't replace them with your own
scrollbar class.
However, this is something I've been thinking about as well, just
recently again, when I was working on some internal aspects of
Fl_Scroll. In the future we *might* create another Fl_Scroll_xx
class (take 'xx' as a placeholder) which would not embed the
scrollbars but use external Fl_Scrollbar widgets which you could
then *maybe* replace with your own scrollbars as long as those
provide the same interface (which means they would likely need to be
a subclass of Fl_Scrollbar).
What did you want to achieve by replacing the scrollbars with your
own scrollbars? Was it only for a better look, or should your
scrollbars have different features? I'm curious...
Many thanks for all the help.
Welcome.
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