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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
8 changed files with 89 additions and 1 deletions
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41
Libraries/LibHTML/DOM/HTMLLinkElement.cpp Normal file
View file

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#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();
}
}