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LibWeb: Bring Element.client{Width,Height} closer to spec

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There were two main issues with these functions:

1. They were not updating layout before inspecting metrics.
2. They were not returning viewport metrics for the root and body
   elements when appropriate.
This commit is contained in:
Andreas Kling 2022-04-10 20:28:18 +02:00
parent b5faeb7840
commit bb17f74fb1
1 changed files with 40 additions and 6 deletions
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46
Userland/Libraries/LibWeb/DOM/Element.cpp
View file

@ -25,6 +25,8 @@
#include <LibWeb/Geometry/DOMRectList.h>
#include <LibWeb/HTML/BrowsingContext.h>
#include <LibWeb/HTML/EventLoop/EventLoop.h>
#include <LibWeb/HTML/HTMLBodyElement.h>
#include <LibWeb/HTML/HTMLHtmlElement.h>
#include <LibWeb/HTML/Parser/HTMLParser.h>
#include <LibWeb/Layout/BlockContainer.h>
#include <LibWeb/Layout/InitialContainingBlock.h>
@ -586,18 +588,50 @@ int Element::client_left() const
return 0;
}
// https://drafts.csswg.org/cssom-view/#dom-element-clientwidth
int Element::client_width() const
{
if (auto* paint_box = this->paint_box())
return paint_box->absolute_rect().width();
return 0;
// NOTE: Ensure that layout is up-to-date before looking at metrics.
const_cast<Document&>(document()).update_layout();
// 1. If the element has no associated CSS layout box or if the CSS layout box is inline, return zero.
if (!paint_box())
return 0;
// 2. If the element is the root element and the element’s node document is not in quirks mode,
// or if the element is the HTML body element and the element’s node document is in quirks mode,
// return the viewport width excluding the size of a rendered scroll bar (if any).
if ((is<HTML::HTMLHtmlElement>(*this) && !document().in_quirks_mode())
|| (is<HTML::HTMLBodyElement>(*this) && document().in_quirks_mode())) {
return document().browsing_context()->viewport_rect().width();
}
// 3. Return the width of the padding edge excluding the width of any rendered scrollbar between the padding edge and the border edge,
// ignoring any transforms that apply to the element and its ancestors.
return paint_box()->absolute_padding_box_rect().width();
}
// https://drafts.csswg.org/cssom-view/#dom-element-clientheight
int Element::client_height() const
{
if (auto* paint_box = this->paint_box())
return paint_box->absolute_rect().height();
return 0;
// NOTE: Ensure that layout is up-to-date before looking at metrics.
const_cast<Document&>(document()).update_layout();
// 1. If the element has no associated CSS layout box or if the CSS layout box is inline, return zero.
if (!paint_box())
return 0;
// 2. If the element is the root element and the element’s node document is not in quirks mode,
// or if the element is the HTML body element and the element’s node document is in quirks mode,
// return the viewport height excluding the size of a rendered scroll bar (if any).
if ((is<HTML::HTMLHtmlElement>(*this) && !document().in_quirks_mode())
|| (is<HTML::HTMLBodyElement>(*this) && document().in_quirks_mode())) {
return document().browsing_context()->viewport_rect().height();
}
// 3. Return the height of the padding edge excluding the height of any rendered scrollbar between the padding edge and the border edge,
// ignoring any transforms that apply to the element and its ancestors.
return paint_box()->absolute_padding_box_rect().height();
}
void Element::children_changed()