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Re: [platform-ui-dev] Question regarding theming
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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
