Re: How to detect a gtk desktop programmatically

Just to confirm, OpenJDK is currently leveraging "gtk-theme-name" as you've
indicated:
https://github.com/AdoptOpenJDK/openjdk-jdk/blob/858ec1c5fad02242b7452099f3d5789e55a79057/src/java.desktop/unix/native/libawt_xawt/awt/gtk3_interface.c#L725

I believe question is less about which theme and more about how to know the
desktop is running to begin with.  Any insight is greatly appreciated.


- [email protected]


On Wed, Apr 29, 2020 at 3:03 PM Tres Finocchiaro <[email protected]>
wrote:

> Matthias,
>
> Thanks for the detailed response.  Please accept my lack of knowledge on
> the subject as I'm neither an OpenJDK developer nor a C developer, (I
> develop using Java, so information is to benefit the bug report against
> OpenJDK).  That said...
>
> It appears the environment variable is a preflight which is leveraged to
> avoid loading the libraries unintentionally.
>
> I think what OpenJDK is trying to avoid is blindly loading a library
> that's on the system without knowing if it's actually in-use.  This
> variable -- albeit deprecated -- was a reliable way to know that.
>
> Here it checks to see if Gnome is running:
>
> https://github.com/AdoptOpenJDK/openjdk-jdk/blob/634c676e6c145c936b460debaa95d0b6cfa61ae2/src/java.desktop/unix/classes/sun/awt/UNIXToolkit.java#L100
>
> Here, it configures the look and feel:
>
> https://github.com/AdoptOpenJDK/openjdk-jdk/blob/634c676e6c145c936b460debaa95d0b6cfa61ae2/src/java.desktop/share/classes/javax/swing/UIManager.java#L665
>
> And deeper into the native calls, it interacts with Gtk libraries:
>
> https://github.com/AdoptOpenJDK/openjdk-jdk/blob/634c676e6c145c936b460debaa95d0b6cfa61ae2/src/java.desktop/unix/native/libawt_xawt/awt/awt_UNIXToolkit.c#L53
>
> So although I can't answer the specific theming questions, I can confirm
> the theme seems to apply correctly on systems which utilize it.  It's less
> of a matter of how to detect the theme and more of a matter of how to
> detect that the desktop environment offers a Gtk theme to begin with.
>
> Albeit deprecated and clunky, GNOME_DESKTOP_SESSION_ID seemed to have been
> the way Java's known this historically and removal of it requires a
> replacement of which I'm hoping to gain knowledge of.
>
> - [email protected]
>
>
> On Wed, Apr 29, 2020 at 1:37 PM Matthias Clasen <[email protected]>
> wrote:
>
>>
>> Hey Tres,
>>
>> in my opinion, environment variables are about the worst possible option
>> for this sort of thing.
>>
>> If you are linking against GTK, the easiest way is to just ask GTK itself
>> if you need to know
>> the theme name:
>>
>> g_object_get (gtk_settings_get_defautt (), "gtk-theme-name", &theme,
>> NULL);
>>
>> But I am not sure that the theme name is really needed. What information
>> are you looking for
>> exactly ? And what decision are you going to make based on it ?
>>
>>

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