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LibHTML: Add support for <body bgcolor="#rrggbb" text="#rrggbb">

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This patch implements basic support for presentational hints, which are
old-school HTML attributes that affect style.

You add support for a presentational hint attribute by overriding
Element::apply_presentational_hints(StyleProperties&) and setting all
of the corresponding CSS properties as appropriate.

To make the background color fill the entire document, not just the
bounds of the <body> element's LayoutNode, we special-case it in the
HtmlView::paint_event() code for now. I'm not entirely sure what the
nicest solution would be, but I'm sure we'll discover it eventually.
This commit is contained in:
Andreas Kling 2019-10-04 21:05:52 +02:00
parent a7ca719c4e
commit 9808d35554
12 changed files with 94 additions and 5 deletions
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26
Libraries/LibHTML/DOM/Document.cpp
View file

@ -1,6 +1,7 @@
#include <LibHTML/CSS/StyleResolver.h>
#include <LibHTML/DOM/Document.h>
#include <LibHTML/DOM/Element.h>
#include <LibHTML/DOM/HTMLBodyElement.h>
#include <LibHTML/DOM/HTMLHeadElement.h>
#include <LibHTML/DOM/HTMLHtmlElement.h>
#include <LibHTML/DOM/HTMLTitleElement.h>
@ -52,6 +53,14 @@ const HTMLHeadElement* Document::head() const
return static_cast<const HTMLHeadElement*>(html->first_child_with_tag_name("head"));
}
const HTMLBodyElement* Document::body() const
{
auto* html = document_element();
if (!html)
return nullptr;
return static_cast<const HTMLBodyElement*>(html->first_child_with_tag_name("body"));
}
String Document::title() const
{
auto* head_element = head();
@ -73,3 +82,20 @@ void Document::attach_to_frame(Badge<Frame>, Frame& frame)
void Document::detach_from_frame(Badge<Frame>, Frame&)
{
}
Color Document::background_color() const
{
auto* body_element = body();
if (!body_element)
return Color::White;
auto* body_layout_node = body_element->layout_node();
if (!body_layout_node)
return Color::White;
auto background_color = body_layout_node->style().property("background-color");
if (!background_color.has_value() || !background_color.value()->is_color())
return Color::White;
return background_color.value()->to_color();
}

4
Libraries/LibHTML/DOM/Document.h
View file

@ -9,6 +9,7 @@
#include <LibHTML/DOM/ParentNode.h>
class Frame;
class HTMLBodyElement;
class HTMLHtmlElement;
class HTMLHeadElement;
class LayoutNode;
@ -35,6 +36,7 @@ public:
const HTMLHtmlElement* document_element() const;
const HTMLHeadElement* head() const;
const HTMLBodyElement* body() const;
String title() const;
@ -44,6 +46,8 @@ public:
Frame* frame() { return m_frame.ptr(); }
const Frame* frame() const { return m_frame.ptr(); }
Color background_color() const;
private:
OwnPtr<StyleResolver> m_style_resolver;
NonnullRefPtrVector<StyleSheet> m_sheets;

5
Libraries/LibHTML/DOM/Element.h
View file

@ -1,7 +1,7 @@
#pragma once
#include <LibHTML/DOM/ParentNode.h>
#include <AK/String.h>
#include <LibHTML/DOM/ParentNode.h>
class Attribute {
public:
@ -42,6 +42,8 @@ public:
bool has_class(const StringView&) const;
virtual void apply_presentational_hints(StyleProperties&) const {}
private:
Attribute* find_attribute(const String& name);
const Attribute* find_attribute(const String& name) const;
@ -49,4 +51,3 @@ private:
String m_tag_name;
Vector<Attribute> m_attributes;
};

27
Libraries/LibHTML/DOM/HTMLBodyElement.cpp Normal file
View file

@ -0,0 +1,27 @@
#include <LibHTML/CSS/StyleProperties.h>
#include <LibHTML/CSS/StyleValue.h>
#include <LibHTML/DOM/HTMLBodyElement.h>
HTMLBodyElement::HTMLBodyElement(Document& document, const String& tag_name)
: HTMLElement(document, tag_name)
{
}
HTMLBodyElement::~HTMLBodyElement()
{
}
void HTMLBodyElement::apply_presentational_hints(StyleProperties& style) const
{
for_each_attribute([&](auto& name, auto& value) {
if (name == "bgcolor") {
auto color = Color::from_string(value);
if (color.has_value())
style.set_property("background-color", ColorStyleValue::create(color.value()));
} else if (name == "text") {
auto color = Color::from_string(value);
if (color.has_value())
style.set_property("color", ColorStyleValue::create(color.value()));
}
});
}

11
Libraries/LibHTML/DOM/HTMLBodyElement.h Normal file
View file

@ -0,0 +1,11 @@
#pragma once
#include <LibHTML/DOM/HTMLElement.h>
class HTMLBodyElement : public HTMLElement {
public:
HTMLBodyElement(Document&, const String& tag_name);
virtual ~HTMLBodyElement() override;
virtual void apply_presentational_hints(StyleProperties&) const override;
};

2
Libraries/LibHTML/DOM/Node.cpp
View file

@ -27,6 +27,8 @@ RefPtr<LayoutNode> Node::create_layout_node(const StyleResolver& resolver, const
if (is_text())
return adopt(*new LayoutText(static_cast<const Text&>(*this)));
ASSERT(is_element());
auto style_properties = resolver.resolve_style(static_cast<const Element&>(*this), parent_properties);
auto display_property = style_properties->property("display");

6
Libraries/LibHTML/DOM/Node.h
View file

@ -58,9 +58,15 @@ public:
virtual void inserted_into(Node&) {}
virtual void removed_from(Node&) {}
const LayoutNode* layout_node() const { return m_layout_node; }
LayoutNode* layout_node() { return m_layout_node; }
void set_layout_node(Badge<LayoutNode>, LayoutNode* layout_node) const { m_layout_node = layout_node; }
protected:
Node(Document&, NodeType);
Document& m_document;
mutable LayoutNode* m_layout_node { nullptr };
NodeType m_type { NodeType::INVALID };
};