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Re: [platform-ui-dev] Question regarding theming 
Dear Eric,

thank you for your explanations. Maybe I rephrase my question.
In one of our plugins we have the use-case, that we visualize
a distinct semantic state by setting the foreground / background color
of a control, e.g. with 
       control.setForeground(…);
and later remove that color with
        control.setForeground(null);

But control.setForeground(null); set’s it back to the system color appropriate for that widget. 
In the Dark Theme where the widget is styled this is the wrong color (a light one instead of a dark one).

How can we reset the foreground / background color to the one defined in the current theme?

Regards,
Matthias

On 22.06.17, 20:10, "platform-ui-dev-bounces@xxxxxxxxxxx on behalf of Eric Williams" <platform-ui-dev-bounces@xxxxxxxxxxx on behalf of ericwill@xxxxxxxxxx> wrote:

    Hello,
    
    On 06/21/2017 11:24 AM, Becker, Matthias wrote:
    > Dear all,
    > 
    > if I see it correct colors you obtain via 
    > Display.getCurrent().getSystemColor( ) (e.g. 
    > SWT.COLOR_WIDGET_BACKGROUND) are not adapted via the CSS theming.
    > 
    > So all usages of Display.getCurrent().getSystemColor( ) are potential 
    > causes for theming errors. Is there a clear guidance on the usage of 
    > Display.getCurrent().getSystemColor( ) and possible alternatives?
    > 
    > Is there an API to obtain e.g. the background color an SWT text widget 
    > would get based on the current theme? I know I can call 
    > Control.getBackground() to get the current background color of a given
    > 
    > control but what to do if don’t have an instance of SWT.Text at hand?
    
    Display.getSystemColor() returns a color that is native to the operating 
    system. These are the same colors you see for default OS widgets.
    On Linux this means parsing the currently running GTK theme and 
    extracting certain color values from it.
    
    If an SWT widget is unstyled (it has no background and/or foreground 
    colors set), then it should adhere to the colors found in 
    Display.getSystemColors(). For example:
    
    Text/Table/Tree based widgets: COLOR_LIST_* (sometimes COLOR_TITLE_*)
    Buttons, Toolbars, other common widgets: COLOR_WIDGET_*
    Tooltips: COLOR_INFO_*
    Links: COLOR_LINK_*
    
    If a widget is indeed unstyled, then calling getBack/Foreground() on it 
    should return the system color appropriate for that widget. If a widget 
    is styled, calling setBack/Foreground(null) and then 
    getBack/Foreground() will have the same effect.
    
    If you have no widget at hand, using the system colors will give you an 
    idea of what that widget should look like by default. Using Text as an 
    example, its background should be COLOR_LIST_BACKGROUND and the 
    foreground should be COLOR_LIST_FOREGROUND. Selections/highlighting 
    should be COLOR_LIST_SELECTION as the background and 
    COLOR_LIST_SELECTION_TEXT as the foreground.
    
    
    -- 
    Eric Williams
    Associate Software Engineer - Eclipse Team
    Red Hat
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