When you add or remove style-classes, CSS for the node (and all its
children) is totally re-calculated. This means that cached data for that
node is tossed out and the node is styled from scratch, as if it were
just added to the scene-graph.
You are much better off using pseudo-class state for what you are trying
to do. Changes in pseudo-class state just causes evaluation of what
styles are applied in that state, which is relatively low overhead
compared to re-calculating styles.
To debug, you should try using Scenic View
(http://fxexperience.com/scenic-view/)
You can also use the Node API Map<StyleableProperty<?>,List<Style>>
impl_findStyles(Map<StyleableProperty<?>,List<Style>> styleMap). Note
that this is deprecated API
On 4/3/15 2:13 PM, Tom Eugelink wrote:
One addition: the move happens if, for example, "segment0-active" is
added to the skinnable. Even if that class is empty or even not
defined in the CSS.
Tom
On 3-4-2015 19:48, Tom Eugelink wrote:
I'm pushing the envelope a bit -I think- concerning the use of CSS. I
have setup a control (gauge) in such a way that, depending on the
position of the needle, certain CSS classes are added or removed from
the control. For example a "errorSegment-active" class if the value
comes into the 90-100 value in a 0-100 gauge. In this class a CSS
variable -fx-error-indicator-visibility is set to "visible" and that
again shows some kind of indicator on the gauge. Works great.
What is strange is when this class is assigned to the control, a
totally unrelated node (the value in the needle) suddenly moves out
of position. I do not understand this, because the CSS only involves
colors and visibility, never any transformation.
https://github.com/JFXtras/jfxtras-labs/blob/8.0/src/main/resources/jfxtras/labs/internal/scene/control/gauge/linear/SimpleMetroArcGauge.css
Is there any way to debug what CSS settings are applied to nodes? I
really would like to find out what causes that node to move.
Tom
