Re: FXTreeList scrolling

On Thu, 10 Oct 2024 16:13:42 -0400
"John Selverian" <[email protected]> wrote:

>I have a FXScrollWindow with a FXHorizontalFrame. The first child
>is a FXVerticalFrame contains a bunch of FXCheckButton and the
>second child is a FXTreeList. The FXTreeList is always fully
>expanded so the items match up with the check boxes.
>
> 
>
>The problem I have is in scrolling. When I hover the mouse over
>the checkboxes of over the scrollbar I can scroll with the mouse.
>However, when the mouse is over the treelist the scrolling does
>not work.
>
> 
>
>I tried disabling scrolling in the treelist, thinking it would
>pass it up the chain, but it does not work. Then I tried to catch
>the SEL_MOUSEWHEEL event for the treelist and handle it there but
>I can't capture the SEL_MOUSEWHEEL event from the treelist.
>
> 
>
>Any ideas?

Generally, mouse evens are delivered to the widget under the cursor,
unless some other widget has "grabbed" the mouse.  

If you're wheeling over things that don't handle the SEL_MOUSEWHEEL
events, then those SEL_MOUSEWHEEL events should be handled by that
window's parents [and so on, until we're reached the top].

Now, if the FXCheckButton widget itself doesn't handle the mouse
wheel, then its baseclass FXWindow will pass it to its target.

So then the question becomes if the FXCheckButton's target handler
class somehow handles a SEL_MOUSEWHEEL message with the source ID
equal to the FXCheckButton's message ID.

Make sure nothing accidentally handles that!


  -- JVZ





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