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Composite background & dark theme [message #1807246]

Sun, 26 May 2019 02:25

Eclipse User

Hello

sry for my english :)

I am developing a small plugin and i have pb with composite background and dark theme.
If I do

Composite c = new Composite(parent, SWT.None)

, the dark theme is taken into account
but if I change to

Composite c = new Composite(parent, SWT.None) {}
or
Composite c = new SpecialComposite(parent, SWT.None);

class SpecialComposite extends Composite
{
 ...
}

the dark theme is not applied to my composite.

Possible to workaround?

thanks

Re: Composite background & dark theme [message #1807287 is a reply to message #1807246]

Mon, 27 May 2019 10:12

Eclipse User

Most themes apply CSS using SWT Widget names, like `Composite`. By making a subclass of Composite, you introduce a new class with a different name and so those CSS rules won't match.

Why are you subclassing Composite?

Brian.

Re: Composite background & dark theme [message #1807297 is a reply to message #1807287]

Mon, 27 May 2019 12:45

Eclipse User

Hi Brian

Thanks for response

> you introduce a new class with a different name and so those CSS rules won't match.
Do I need to define CSS for each theme (light, dark, etc...)?

> Why are you subclassing Composite?
In fact, I subclass Section to access to protected field and I had pb with it but not with no subClass Section so I have tested with Composite class to post the problem.

Re: Composite background & dark theme [message #1822341 is a reply to message #1807297]

Wed, 04 March 2020 08:38

Eclipse User

I made Custom Element Provider, CustomCompositeElement, and overrided computeLocalName().
And made marker annnotation @CSSComposite.

Bit hacky but worked well.

By default, computeLocalName method returns SimpleClassName of the Widget.
Change this if you want to disguise your Custom Composite as Normal SWT Composite.

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