tree 4d68050d7c912f5dbc9d8ad27eff7ef8bcec4793
parent 73c7b7b08069136c6d85537e1fc3427dd8fa1d44
author rniwa@webkit.org <rniwa@webkit.org@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1570860544 +0000
committer rniwa@webkit.org <rniwa@webkit.org@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1570860544 +0000

Add the support for ShadowRoot.delegateFocus
https://bugs.webkit.org/show_bug.cgi?id=166484
<rdar://problem/29816058>

Reviewed by Antti Koivisto.

LayoutTests/imported/w3c:

Import W3C tests from https://github.com/web-platform-tests/wpt/pull/18035/commits/a8a89f224f2170723170a452cb18b46cafb723b6.

* web-platform-tests/resources/testdriver-vendor.js:
* web-platform-tests/shadow-dom/focus/click-focus-delegatesFocus-click-method-expected.txt: Added.
* web-platform-tests/shadow-dom/focus/click-focus-delegatesFocus-click-method.html: Added.
* web-platform-tests/shadow-dom/focus/click-focus-delegatesFocus-tabindex-varies-expected.txt: Added.
* web-platform-tests/shadow-dom/focus/click-focus-delegatesFocus-tabindex-varies.html: Added.
* web-platform-tests/shadow-dom/focus/click-focus-delegatesFocus-tabindex-zero-expected.txt: Added.
* web-platform-tests/shadow-dom/focus/click-focus-delegatesFocus-tabindex-zero.html: Added.
* web-platform-tests/shadow-dom/focus/focus-method-delegatesFocus-expected.txt: Added.
* web-platform-tests/shadow-dom/focus/focus-method-delegatesFocus.html: Added.
* web-platform-tests/shadow-dom/focus/focus-tabindex-order-shadow-negative-delegatesFocus-expected.txt: Added.
* web-platform-tests/shadow-dom/focus/focus-tabindex-order-shadow-negative-delegatesFocus.html: Added.
* web-platform-tests/shadow-dom/focus/focus-tabindex-order-shadow-varying-delegatesFocus-expected.txt: Added.
* web-platform-tests/shadow-dom/focus/focus-tabindex-order-shadow-varying-delegatesFocus.html: Added.
* web-platform-tests/shadow-dom/focus/focus-tabindex-order-shadow-zero-delegatesFocus-expected.txt: Added.
* web-platform-tests/shadow-dom/focus/focus-tabindex-order-shadow-zero-delegatesFocus.html: Added.

Source/WebCore:

Implement delegatesFocus as specified in https://github.com/whatwg/html/pull/4796

When the shadow root of an element has delegates focus flag set, focusing on the shadow host would automatically
"delegates" focus to the first focusable element in the shadow tree instead.

The first focusable element is determined as the first element that is programatically focusable or mouse focusable
in the flat tree (composed tree in WebKit's terminology) in the case of the element getting focused via DOM API,
Element.prototype.focus, by via mouse down. In the case of sequential focus navigation (via tab key), it's the
first keyboard focusable element in the tabIndex order.

Tests: imported/w3c/web-platform-tests/shadow-dom/focus/click-focus-delegatesFocus-click-method.html
       imported/w3c/web-platform-tests/shadow-dom/focus/click-focus-delegatesFocus-tabindex-varies.html
       imported/w3c/web-platform-tests/shadow-dom/focus/click-focus-delegatesFocus-tabindex-zero.html
       imported/w3c/web-platform-tests/shadow-dom/focus/focus-method-delegatesFocus.html
       imported/w3c/web-platform-tests/shadow-dom/focus/focus-tabindex-order-shadow-negative-delegatesFocus.html
       imported/w3c/web-platform-tests/shadow-dom/focus/focus-tabindex-order-shadow-varying-delegatesFocus.html
       imported/w3c/web-platform-tests/shadow-dom/focus/focus-tabindex-order-shadow-zero-delegatesFocus.html

* dom/Element.cpp:
(WebCore::Element::isKeyboardFocusable const): A shadow host with the delegates focus flag is not considered as
keyboard focusable. The rest is taken care of by the existing logic in FocusController.
(WebCore::isProgramaticallyFocusable): Extracted from Element::focus.
(WebCore::findFirstProgramaticallyFocusableElementInComposedTree): Added.
(WebCore::Element::focus): Added the support for delegatesFocus.
* dom/Element.h:
(WebCore::ShadowRootInit::delegatesFocus): Added.
* dom/Element.idl: Ditto.
* dom/ShadowRoot.cpp:
(WebCore::ShadowRoot::ShadowRoot): Added delegatesFocus to the constructor.
* dom/ShadowRoot.h:
* page/EventHandler.cpp:
(WebCore::findFirstMouseFocusableElementInComposedTree): Added.
(WebCore::EventHandler::dispatchMouseEvent): Added the support for delegatesFocus. Uses the first mouse focusable
element in the flat tree (composed tree) order.
* page/FocusController.cpp:
(WebCore::FocusController::findFirstFocusableElementInShadowRoot):
* page/FocusController.h:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@251043 268f45cc-cd09-0410-ab3c-d52691b4dbfc