[wp-trac] [WordPress Trac] #38949: Twenty Seventeen: child themes can't easily extend custom color patterns

[WordPress Trac]

#38949: Twenty Seventeen: child themes can't easily extend custom color patterns
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 Reporter:  celloexpressions  |      Owner:
     Type:  defect (bug)      |     Status:  new
 Priority:  normal            |  Milestone:  4.7
Component:  Bundled Theme     |    Version:  trunk
 Severity:  normal            |   Keywords:  has-patch
  Focuses:                    |
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 Child themes of Twenty Seventeen may elect to retain the base custom
 colors functionality, for example if the child theme makes primarily
 functional rather than visual changes. However, it is currently not
 possible to extend the base custom colors CSS directly.

 Rather than adding separate functions and style elements to print child
 theme-specific extensions of the base theme colors CSS, and manually
 adding a live-preview mechanism for the customizer, child themes should be
 able to filter the generated CSS directly, with direct access to the
 current `hue` and `saturation` as well.

 The forthcoming patch adds the filter to
 `twentyseventeen_custom_colors_css()` and will be followed by an example.
 This allows child themes (or plugins) to add CSS in one place without
 needing to add previewing logic or even deal with outputting the CSS.

 Note: the dark color scheme can be easily supported within the child
 theme's main CSS file or a separate one, by scoping CSS to `.colors-dark`.
 A filter is needed for custom color schemes.

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Ticket URL: <https://core.trac.wordpress.org/ticket/38949>
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