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LibWeb: Add DOMRect and Element.getBoundingClientRect()

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This marks our entry into the Web::Geometry namespace, based on the
"Geometry" spec at https://drafts.fxtf.org/geometry/
This commit is contained in:
Andreas Kling 2021-09-27 00:55:13 +02:00
parent 0c63f0bf73
commit 43d378940f
8 changed files with 112 additions and 1 deletions
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17
Userland/Libraries/LibWeb/DOM/Element.cpp
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@ -18,6 +18,7 @@
#include <LibWeb/DOM/ShadowRoot.h>
#include <LibWeb/DOM/Text.h>
#include <LibWeb/DOMParsing/InnerHTML.h>
#include <LibWeb/Geometry/DOMRect.h>
#include <LibWeb/HTML/EventLoop/EventLoop.h>
#include <LibWeb/HTML/Parser/HTMLParser.h>
#include <LibWeb/Layout/BlockBox.h>
@ -29,6 +30,7 @@
#include <LibWeb/Layout/TableRowGroupBox.h>
#include <LibWeb/Layout/TreeBuilder.h>
#include <LibWeb/Namespace.h>
#include <LibWeb/Page/BrowsingContext.h>
namespace Web::DOM {
@ -325,4 +327,19 @@ bool Element::serializes_as_void() const
return is_void_element() || local_name().is_one_of(HTML::TagNames::basefont, HTML::TagNames::bgsound, HTML::TagNames::frame, HTML::TagNames::keygen);
}
// https://drafts.csswg.org/cssom-view/#dom-element-getboundingclientrect
NonnullRefPtr<Geometry::DOMRect> Element::get_bounding_client_rect() const
{
// FIXME: Support inline layout nodes as well.
if (!layout_node() || !layout_node()->is_box())
return Geometry::DOMRect::create(0, 0, 0, 0);
VERIFY(document().browsing_context());
auto viewport_offset = document().browsing_context()->viewport_scroll_offset();
auto& box = static_cast<Layout::Box const&>(*layout_node());
return Geometry::DOMRect::create(box.absolute_rect().translated(-viewport_offset.x(), -viewport_offset.y()));
}
}