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LibHTML: Start adding support for <link rel="stylesheet">

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This patch adds basic support for external stylesheets. It currently
only works with file:// URLs.

We do a synchronous full relayout after loading a stylesheet, which is
definitely on the aggressive side, but it gives us something to work
on improving. :^)
This commit is contained in:
Andreas Kling 2019-10-07 19:06:47 +02:00
parent c136fd3fe2
commit 71e8ddcd1c
Notes: sideshowbarker 2024-07-19 11:45:40 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/71e8ddcd1c0
8 changed files with 89 additions and 1 deletions
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8
Base/home/anon/www/link.css Normal file
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@ -0,0 +1,8 @@
#foo {
background-color: teal;
color: white;
padding-left: 20;
padding-top: 20;
padding-right: 20;
padding-bottom: 20;
}

9
Base/home/anon/www/link.html Normal file
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@ -0,0 +1,9 @@
<html>
<head>
<title>Link element test</title>
<link rel="stylesheet" href="link.css">
</head>
<body>
<div id="foo">I should be styled!</div>
</body>
</html>

1
Base/home/anon/www/welcome.html
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@ -22,6 +22,7 @@ h1 {
<li><a href="phint.html">presentational hints</a></li>
<li><a href="images.html">images</a></li>
<li><a href="selectors.html">selectors</a></li>
<li><a href="link.html">link element</a></li>
</ul>
</body>
</html>

41
Libraries/LibHTML/DOM/HTMLLinkElement.cpp Normal file
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@ -0,0 +1,41 @@
#include <AK/URL.h>
#include <LibCore/CFile.h>
#include <LibHTML/DOM/Document.h>
#include <LibHTML/DOM/HTMLLinkElement.h>
#include <LibHTML/Parser/CSSParser.h>
HTMLLinkElement::HTMLLinkElement(Document& document, const String& tag_name)
: HTMLElement(document, tag_name)
{
}
HTMLLinkElement::~HTMLLinkElement()
{
}
void HTMLLinkElement::inserted_into(Node&)
{
if (rel() == "stylesheet") {
URL url = document().complete_url(href());
if (url.protocol() != "file") {
ASSERT_NOT_REACHED();
}
auto file = CFile::construct(url.path());
if (!file->open(CIODevice::ReadOnly)) {
dbg() << "Failed to open " << url.to_string();
ASSERT_NOT_REACHED();
return;
}
auto data = file->read_all();
auto sheet = parse_css(String::copy(data));
if (!sheet) {
dbg() << "Failed to parse " << url.to_string();
ASSERT_NOT_REACHED();
return;
}
document().add_sheet(*sheet);
document().invalidate_layout();
}
}

21
Libraries/LibHTML/DOM/HTMLLinkElement.h Normal file
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@ -0,0 +1,21 @@
#pragma once
#include <LibHTML/DOM/HTMLElement.h>
class HTMLLinkElement final : public HTMLElement {
public:
HTMLLinkElement(Document&, const String& tag_name);
virtual ~HTMLLinkElement() override;
virtual void inserted_into(Node&) override;
String rel() const { return attribute("rel"); }
String type() const { return attribute("type"); }
String href() const { return attribute("href"); }
};
template<>
inline bool is<HTMLLinkElement>(const Node& node)
{
return is<Element>(node) && to<Element>(node).tag_name().to_lowercase() == "link";
}

6
Libraries/LibHTML/HtmlView.cpp
View File

@ -36,7 +36,11 @@ void HtmlView::set_document(Document* document)
m_document->on_invalidate_layout = nullptr;
m_document = document;
m_document->on_invalidate_layout = [this]() { layout_and_sync_size(); };
m_document->on_invalidate_layout = [this]() {
m_layout_root = m_document->create_layout_tree(m_document->style_resolver(), nullptr);
layout_and_sync_size();
update();
};
main_frame().set_document(document);

1
Libraries/LibHTML/Makefile.shared
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@ -13,6 +13,7 @@ LIBHTML_OBJS = \
DOM/HTMLBodyElement.o \
DOM/HTMLFontElement.o \
DOM/HTMLImageElement.o \
DOM/HTMLLinkElement.o \
DOM/Document.o \
DOM/Text.o \
CSS/Selector.o \

3
Libraries/LibHTML/Parser/HTMLParser.cpp
View File

@ -12,6 +12,7 @@
#include <LibHTML/DOM/HTMLImageElement.h>
#include <LibHTML/DOM/HTMLStyleElement.h>
#include <LibHTML/DOM/HTMLTitleElement.h>
#include <LibHTML/DOM/HTMLLinkElement.h>
#include <LibHTML/DOM/Text.h>
#include <LibHTML/Parser/HTMLParser.h>
#include <ctype.h>
@ -36,6 +37,8 @@ static NonnullRefPtr<Element> create_element(Document& document, const String& t
return adopt(*new HTMLStyleElement(document, tag_name));
if (lowercase_tag_name == "title")
return adopt(*new HTMLTitleElement(document, tag_name));
if (lowercase_tag_name == "link")
return adopt(*new HTMLLinkElement(document, tag_name));
if (lowercase_tag_name == "img")
return adopt(*new HTMLImageElement(document, tag_name));
if (lowercase_tag_name == "h1"