tree c3a727db01f73a849e0f36fb3cf564db8dca4ce7
parent bb614c5af289a3dce553d875de3436a21ef4cd04
author rniwa@webkit.org <rniwa@webkit.org@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1571473860 +0000
committer rniwa@webkit.org <rniwa@webkit.org@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1571473860 +0000

Integrate media query evaluation into HTML5 event loop
https://bugs.webkit.org/show_bug.cgi?id=203134
<rdar://problem/56396316>

Reviewed by Antti Koivisto.

Source/WebCore:

Moved the code to call media query listeners to HTML5 event loop's step to update the rendering:
https://html.spec.whatwg.org/multipage/webappapis.html#update-the-rendering

Tests: fast/media/mq-inverted-colors-live-update-for-listener.html
       fast/media/mq-prefers-reduced-motion-live-update-for-listener.html

* css/MediaQueryMatcher.cpp:
(WebCore::MediaQueryMatcher::evaluateAll): Renamed from styleResolverChanged.
* css/MediaQueryMatcher.h:
* dom/Document.cpp:
(WebCore::Document::updateElementsAffectedByMediaQueries): Split from evaluateMediaQueryList.
This function is still called right after each layout update so that picture element may start
requesting newly selected image resources without having to wait for a rendering update.
But this function will no longer execute arbitrary scripts.
(WebCore::Document::evaluateMediaQueriesAndReportChanges): Split from evaluateMediaQueryList.
Evaluates media query listeners.
* dom/Document.h:
* inspector/agents/InspectorPageAgent.cpp:
(WebCore::InspectorPageAgent::setEmulatedMedia): Force the evaluation of media queries for now
but this code should really be scheduling a rendering update instead so added a FIXME.
* page/Frame.cpp:
(WebCore::Frame::setPrinting): Evaluate media queries. We should consider invoking the full
algorithm to update the rendering here. e.g. intersection observer may add more contents.
* page/Page.cpp:
(WebCore::Page::updateRendering): Call evaluateMediaQueriesAndReportChanges.

LayoutTests:

Added tests for listening to accessiblity related media queries without having any style rules
get affected by those media queries so that we can catch any future regressions. For now,
changing accessiblity settings seem to always schedule a rendering update so there is nothing to do
when these accessibility settings do change.

* fast/media/media-query-list-07.html: Fixed the test to be compatible with new behavior.
* fast/media/mq-inverted-colors-live-update-for-listener-expected.txt: Added.
* fast/media/mq-inverted-colors-live-update-for-listener.html: Added.
* fast/media/mq-prefers-reduced-motion-live-update-for-listener-expected.txt: Added.
* fast/media/mq-prefers-reduced-motion-live-update-for-listener.html: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@251322 268f45cc-cd09-0410-ab3c-d52691b4dbfc