Can the tree collapsed / expanded icons be changed?

[patrickgell]

Is there a possibility to change the default collapsed (plus sign) and expanded (minus sign) of a tree? Default Java way of setting the icons in the UIMangager doesn't seem to work:

UIManager.put("Tree.collapsedIcon",  new ImageIcon(...));
UIManager.put("Tree.expandedIcon",  new ImageIcon(...));

[kirill-grouchnikov]

UIManager is a rather brittle way for an app to fine-tune what a specific look-and-feel does. I don't see it as a supported API for this.

The primary goal of Substance is to provide a cohesive set of visuals that respect the top-level skin set on the specific root pane and scale properly on high-resolution devices and different font policies.

You can in theory extend SubstanceTreeUI and its installDefaults to pass different values to setExpandedIcon / setCollapsedIcon. This should work now, but no guarantees about future behavior.

And, once again, I don't see any UIManager entries as the API surface that Substance will respect. At most, you can see that as read-only table for the values that Substance uses internally, but even that is a very rough approximation since there are a lot of dynamic visual aspects that depend on screen resolution, font policy, component font size and root pane skin.