How to change primary background color of the main window for FlatLaf Light?

[PavelTurk]

I want to make default light FlatLat theme a little darker. I tried to modify netbeans-14/netbeans/platform/modules/org-netbeans-swing-laf-flatlaf.jar#org/netbeans/swing/FlatLaf.properties file, but it seems that all modifications in this file are ignored. For example,
I set:

nb.multitabs.background=#ff0000
nb.multitabs.foreground=#ff0000
nb.multitabs.activeBackground=#ff0000
nb.multitabs.selectedBackground=#ff0000
nb.multitabs.selectedForeground=#ff0000
nb.multitabs.hoverBackground=#ff0000
nb.multitabs.underlineColor=#ff0000
nb.multitabs.inactiveUnderlineColor=#ff0000

And there are no changes in the appearance. Could anyone say how to do it?

[DevCharly]

Set @background in platform/o.n.swing.laf.flatlaf/src/org/netbeans/swing/laf/flatlaf/FlatLightLaf.properties.

E.g.

@background = #e0e0e0

would change the look to:

[DevCharly]

Update: there is also a register method that takes a File:

File configDir = new File( ... );
FlatLaf.registerCustomDefaultsSource( configDir );

FlatLaf then searches for FlatLaf.properties, FlatLightLaf.properties and FlatDarkLaf.properties in those directory.

[PavelTurk]

@DevCharly Yes, thank you. Now @background color changes. Only one more question - how to set background color for project/files/navigator/services main field? I think it is somehow linked to @background color because it became darker too. I tried to change all properties using @background but didn't find.

[DevCharly]

how to set background color for project/files/navigator/services main field?

I think Tree.background should work.

[PavelTurk]

@DevCharly and @neilcsmith-net , thank you very much for your help!

[neilcsmith-net]

Does NB copy properties files to the cache?

@DevCharly IIRC classes and resources, at least from certain JARs, are cached - see https://github.com/apache/netbeans/blob/master/platform/o.n.bootstrap/arch.xml#L1074