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LibWeb: Implement basic "scroll" events at the document level

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This commit is contained in:
Andreas Kling 2022-09-17 17:40:26 +02:00
parent 07c4bf03b5
commit da451467b1
6 changed files with 65 additions and 1 deletions
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20
Userland/Libraries/LibWeb/HTML/BrowsingContext.cpp
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@ -320,6 +320,7 @@ void BrowsingContext::set_viewport_rect(Gfx::IntRect const& rect)
if (m_viewport_scroll_offset != rect.location()) {
m_viewport_scroll_offset = rect.location();
scroll_offset_did_change();
did_change = true;
}
@ -785,4 +786,23 @@ DOM::Document* BrowsingContext::active_document()
return m_active_document.cell();
}
void BrowsingContext::scroll_offset_did_change()
{
// https://w3c.github.io/csswg-drafts/cssom-view-1/#scrolling-events
// Whenever a viewport gets scrolled (whether in response to user interaction or by an API), the user agent must run these steps:
// 1. Let doc be the viewport’s associated Document.
auto* doc = active_document();
VERIFY(doc);
// 2. If doc is already in doc’s pending scroll event targets, abort these steps.
for (auto& target : doc->pending_scroll_event_targets()) {
if (target.ptr() == doc)
return;
}
// 3. Append doc to doc’s pending scroll event targets.
doc->pending_scroll_event_targets().append(*doc);
}
}