Question about CSS styling

[David Grieve]

On 2/19/14, 5:07 AM, Hervé Girod wrote:
> Hello,
>
> I have a question about how the CSS styling work, when a node skin use sub nodes.
>
> For example, the Button control uses a LabeledText, but it is not necessary to setup the style of the LabeledText inside the button to set the font of the button text (it is done in the button style itself).
The way this generally works is that the control has some JavaFX CSS 
property, like -fx-font. The skin listens to the property and handles 
the state change in whatever manner is appropriate to the skin. So, for 
example, if the Button's graphicProperty changes, the Button's skin will 
be notified and can handle the change. In the most simple case, this 
might be done with bind.

LabeledText is somewhat of a different beast in that it wants map 
properties from Labeled onto properites in Text and vice-versa. 
LabeledText allows for styles like .labeled { -fx-text-fill: red; } to 
affect the Text's fillProperty while still allowing .labeled > .text { 
-fx-fill: yellow; }
>
> But a MenuBar use children menus in its substructure, which have to be styled independently.
>
> How is it possible (or is it possible) to detect programmatically when iterating through the children of a Styleable node which children are automatically styled according to the patent mode style, and which are styled separately ?
It may seem that that the child menus are styled independently, but they 
are not - at least in 8.0. The Styleable interface allows the CSS engine 
to traverse a scene-graph in a way that doesn't depend on a Node's 
parent. In a sense, Styleable provides a mechanism for a css-graph that 
is (somewhat) independent of the scene-graph.

In the case of something like a Menu, the Styleable API 
getStyleableParent() will return the parentMenu or the parentPopup which 
brings it back to the MenuBar.

>
> Hervé
>
> Sent from my iPhone