Tooltip for disabled controls
pavel.safrata at oracle.com
Thu Apr 4 06:34:14 PDT 2013
we've got a request to support tooltips for disabled controls. Tooltip
can be used to explain why the control is disabled which sounds
reasonable. Jira: https://javafx-jira.kenai.com/browse/RT-28850
We have the disableProperty on Node. When a node is disabled, it is not
picked, so no mouse events are delivered to it, so tooltip can't be
shown as it is based on mouse events.
Perhaps not delivering events to a disabled node was a bad decision.
First, there are use-cases where disabled node wants them (showing
tooltip). Second, for ignoring node during picking we have the
mouseTransparent flag and it would be nicer if these two flags were
orthogonal (the reason they're not is probably that mouseTransparent is
much younger). But the behavior can't be easily changed - controls, and
possibly other nodes in user apps, rely on the existing behavior.
There are three basic approaches.
1. Make the events delivered to the disabled nodes. We would either
break backward compatibility (and fix controls), or introduce yet
another flag, something like pickIfDisabled. Then we would enable
picking for the disabled control which would make the tooltip work. But
it would make the entire control work, so we would somehow have to
disable other event handling for such controls.
2. Don't change event delivery and rather introduce some control-layer
solution specific to tooltips. Maybe the disabled control registering a
special tooltip area on its parent or something like that.
3. Do nothing and force users to workarounds like put the disabled
control into an enabled Pane and set the tooltip on the Pane. Sounds
horrible, especially for complex applications.
More information about the openjfx-dev