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LibWeb: Add an interface to be notified of Document state changes

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Some HTML elements, e.g. HTMLMediaElement, need to take action when the
document becomes inactive.
This commit is contained in:
Timothy Flynn 2023-05-04 08:48:53 -04:00 • committed by Andreas Kling
parent 88b8969443
commit f78eadf00f
6 changed files with 92 additions and 1 deletions
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21
Userland/Libraries/LibWeb/DOM/Document.cpp
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@ -23,6 +23,7 @@
#include <LibWeb/DOM/DOMImplementation.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/DOM/DocumentFragment.h>
#include <LibWeb/DOM/DocumentObserver.h>
#include <LibWeb/DOM/DocumentType.h>
#include <LibWeb/DOM/Element.h>
#include <LibWeb/DOM/ElementFactory.h>
@ -371,6 +372,9 @@ void Document::visit_edges(Cell::Visitor& visitor)
for (auto& node_iterator : m_node_iterators)
visitor.visit(node_iterator);
for (auto& document_observer : m_document_observers)
visitor.visit(document_observer);
for (auto& target : m_pending_scroll_event_targets)
visitor.visit(target);
for (auto& target : m_pending_scrollend_event_targets)
@ -2032,6 +2036,18 @@ void Document::unregister_node_iterator(Badge<NodeIterator>, NodeIterator& node_
VERIFY(was_removed);
}
void Document::register_document_observer(Badge<DocumentObserver>, DocumentObserver& document_observer)
{
auto result = m_document_observers.set(document_observer);
VERIFY(result == AK::HashSetResult::InsertedNewEntry);
}
void Document::unregister_document_observer(Badge<DocumentObserver>, DocumentObserver& document_observer)
{
bool was_removed = m_document_observers.remove(document_observer);
VERIFY(was_removed);
}
void Document::increment_number_of_things_delaying_the_load_event(Badge<DocumentLoadEventDelayer>)
{
++m_number_of_things_delaying_the_load_event;
@ -2437,6 +2453,11 @@ bool Document::is_allowed_to_use_feature(PolicyControlledFeature feature) const
void Document::did_stop_being_active_document_in_browsing_context(Badge<HTML::BrowsingContext>)
{
tear_down_layout_tree();
for (auto& document_observer : m_document_observers) {
if (document_observer->document_became_inactive)
document_observer->document_became_inactive();
}
}
// https://w3c.github.io/editing/docs/execCommand/#querycommandsupported()