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Customize: Improve extensibility of Custom CSS.

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* Add `customize_value_custom_css` filter to `WP_Customize_Custom_CSS::value()` method.
* Introduce `customize_update_custom_css_post_content_args` filter in `WP_Customize_Custom_CSS::update()` method.
* Make clear that `wp_get_custom_css()` and `wp_get_custom_css` filter are specifically for obtaining the value to render/display. Eliminate use of `wp_get_custom_css()` when getting the setting value. Use the underlying `post_value` directly when `is_previewed`.
* Move anonymous functions handing JS previewing for `custom_logo`, `custom_css`, and `background` into named functions on the `wp.customize.settingPreviewHandlers` to allow plugins to override/extend preview logic.
* Update `_custom_background_cb` to always print a `style` tag wen in the customizer preview, and update background preview logic to replace existing style element instead of appending a new style to the head so that background changes don't unexpectedly override any Custom CSS in the preview's stylesheet cascade.

Props westonruter, georgestephanis.
See #22058.
Fixes #38672.


git-svn-id: https://develop.svn.wordpress.org/trunk@39209 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Weston Ruter
2016-11-13 02:42:04 +00:00
parent 97ae697d6a
commit c68c1c8ec7
4 changed files with 227 additions and 52 deletions
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8
src/wp-includes/theme.php
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@@ -1500,8 +1500,12 @@ function _custom_background_cb() {
$color = false;
}
if ( ! $background && ! $color )
if ( ! $background && ! $color ) {
if ( is_customize_preview() ) {
echo '<style type="text/css" id="custom-background-css"></style>';
}
return;
}
$style = $color ? "background-color: #$color;" : '';
@@ -1621,7 +1625,7 @@ function wp_get_custom_css_post( $stylesheet = '' ) {
}
/**
* Fetch the saved Custom CSS content.
* Fetch the saved Custom CSS content for rendering.
*
* @since 4.7.0
* @access public