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LibWeb: Implement BrowsingContext::currently_focused_area()

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This is "currently focused area of a top level browsing context"
from the HTML spec.
This commit is contained in:
Andreas Kling 2022-02-06 18:45:29 +01:00
parent 83523cabda
commit 1165a94624
2 changed files with 32 additions and 0 deletions
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30
Userland/Libraries/LibWeb/HTML/BrowsingContext.cpp
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@ -8,6 +8,7 @@
#include <LibWeb/DOM/HTMLCollection.h>
#include <LibWeb/DOM/Window.h>
#include <LibWeb/HTML/BrowsingContext.h>
#include <LibWeb/HTML/BrowsingContextContainer.h>
#include <LibWeb/HTML/EventLoop/EventLoop.h>
#include <LibWeb/HTML/HTMLAnchorElement.h>
#include <LibWeb/Layout/BreakNode.h>
@ -362,4 +363,33 @@ bool BrowsingContext::has_a_rendering_opportunity() const
return true;
}
// https://html.spec.whatwg.org/multipage/interaction.html#currently-focused-area-of-a-top-level-browsing-context
RefPtr<DOM::Node> BrowsingContext::currently_focused_area()
{
// 1. If topLevelBC does not have system focus, then return null.
if (!is_focused_context())
return nullptr;
// 2. Let candidate be topLevelBC's active document.
auto* candidate = active_document();
// 3. While candidate's focused area is a browsing context container with a non-null nested browsing context:
// set candidate to the active document of that browsing context container's nested browsing context.
while (candidate->focused_element()
&& is<HTML::BrowsingContextContainer>(candidate->focused_element())
&& static_cast<HTML::BrowsingContextContainer&>(*candidate->focused_element()).nested_browsing_context()) {
candidate = static_cast<HTML::BrowsingContextContainer&>(*candidate->focused_element()).nested_browsing_context()->active_document();
}
// 4. If candidate's focused area is non-null, set candidate to candidate's focused area.
if (candidate->focused_element()) {
// NOTE: We return right away here instead of assigning to candidate,
// since that would require compromising type safety.
return candidate->focused_element();
}
// 5. Return candidate.
return candidate;
}
}