From an earlier posting on this list, I came to understand that in
JavaFX 8 it is no longer allowed to modify the children list in
layoutChildren, and that such modifications may need to be moved to the
computerPref* methods.
However, I get a different odd issue, and I'm wondering exactly what is
allowed and what isn't when it comes to layout (any documentation on this?)
What's happening is the following:
I got a (subclass of) BorderPane, at the top I have a tab-like control
(let's call it a FilterControl). At the center I got a TreeView.
When the BorderPane gets laid out, I set up the content for both the
TreeView and the FilterControl. I do this in layoutChildren or in
computerPref* of the BorderPane -- it makes no difference. Setting up
the content for the FilterControl involves changing its children list.
The TreeView probably will do the same (adding/removing Cells as needed).
Now, I'm seeing layout issues. The BorderPane for example is often
putting the TreeView right on top of the FilterControl (stuff is
transparent, so I can see it). With other attempts, the FilterControl
is not visible at all (zero height). Forcing an update (by changing
focus) usually clears up the issue and the FilterControl will take its
rightful spot and force the TreeView to be a little less high.
I'm thinking this is somekind of issue with layout and that I'm
approaching this wrong causing the layout problems. However, I don't
quite understand what I'm possibly doing wrong -- modifying the children
of the Top node of the BorderPane during BorderPane's own
computePref/layoutChildren call should be perfectly fine right?
Any help appreciated!
--John
