[ruby-fltk-users] In draw for 1 widget, setting another widget for redraw?

[Stephen D. <st...@da...>]

Takaaki or others,

I'm having redraw pain - perhaps you can help?

I have a Browser_ subclass that I'm using to show a multi-column SQL
result set.

I have also created a Box subclass that I'm using as a heading line placed
on top of the Browser_ subclass.

Now Browser_ automatically adds a horizontal scrollbar if the item_widths
exceed the size of the browser.  The user can now scroll the browser
left-right.

I want to get the header widget to redraw when the browser is scrolled -
my draw routine uses the hposition from the browser to draw the heading
correctly aligned.

Unfortunately, I can't get the heading to redraw at the right time.

FLTK has the horizontal scrollbar callback use hposition to scroll the
browser.  Unfortunately, that hposition method isn't virtual so I can't
intercept it in ruby in order to also scroll the heading.

So my second idea was to detect the change in hposition in my Browser_
item_draw.  This detection works OK.

But: when I notice the hposition change I call the heading's redraw.

At which point nothing happens.

I suppose this has something to do with the fact that I call the heading's
redraw out of the browser_'s draw.  But I can't figure out why or what the
connection is...

Any ideas or suggestions?

Thanks,
Steve Davies