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LibWeb: Flesh out "document visibility" state a bit more

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We can now "update the visibility state", which also causes
`visibilitychange` events to fire on the document.

This still needs GUI integration work at the BrowsingContext level.
This commit is contained in:
Andreas Kling 2022-09-19 17:17:20 +02:00
parent 5a500827b8
commit 42b8656db3
3 changed files with 28 additions and 3 deletions
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22
Userland/Libraries/LibWeb/DOM/Document.cpp
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@ -1578,13 +1578,31 @@ Bindings::LocationObject* Document::location()
// https://html.spec.whatwg.org/multipage/interaction.html#dom-document-hidden
bool Document::hidden() const
{
return false;
return visibility_state() == "hidden";
}
// https://html.spec.whatwg.org/multipage/interaction.html#dom-document-visibilitystate
String Document::visibility_state() const
{
return hidden() ? "hidden" : "visible";
return m_visibility_state;
}
// https://html.spec.whatwg.org/multipage/interaction.html#update-the-visibility-state
void Document::update_the_visibility_state(String visibility_state)
{
// 1. If document's visibility state equals visibilityState, then return.
if (m_visibility_state == visibility_state)
return;
// 2. Set document's visibility state to visibilityState.
m_visibility_state = visibility_state;
// FIXME: 3. Run any page visibility change steps which may be defined in other specifications, with visibility state and document.
// 4. Fire an event named visibilitychange at document, with its bubbles attribute initialized to true.
auto event = DOM::Event::create(window(), HTML::EventNames::visibilitychange);
event->set_bubbles(true);
dispatch_event(event);
}
// https://drafts.csswg.org/cssom-view/#run-the-resize-steps