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LibHTML: Implement the <br> element for line breaking

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The <br> element will produce a special LayoutBreak node in the layout
tree, which forces a break in the line layout whenever encountered.

This patch also makes LayoutBlock use the current line-height as the
minimum effective height for each line box. This ensures that having
multiple <br> elements in a row doesn't create 0-height line boxes.
This commit is contained in:
Andreas Kling 2019-10-12 13:47:49 +02:00
parent bf79b198f6
commit 6242459c0f
9 changed files with 89 additions and 1 deletions
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3
Libraries/LibHTML/DOM/ElementFactory.cpp
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@ -1,5 +1,6 @@
#include <LibHTML/DOM/ElementFactory.h>
#include <LibHTML/DOM/HTMLAnchorElement.h>
#include <LibHTML/DOM/HTMLBRElement.h>
#include <LibHTML/DOM/HTMLBlinkElement.h>
#include <LibHTML/DOM/HTMLBodyElement.h>
#include <LibHTML/DOM/HTMLFontElement.h>
@ -37,6 +38,8 @@ NonnullRefPtr<Element> create_element(Document& document, const String& tag_name
return adopt(*new HTMLImageElement(document, lowercase_tag_name));
if (lowercase_tag_name == "blink")
return adopt(*new HTMLBlinkElement(document, lowercase_tag_name));
if (lowercase_tag_name == "br")
return adopt(*new HTMLBRElement(document, lowercase_tag_name));
if (lowercase_tag_name == "h1"
|| lowercase_tag_name == "h2"
|| lowercase_tag_name == "h3"

16
Libraries/LibHTML/DOM/HTMLBRElement.cpp Normal file
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@ -0,0 +1,16 @@
#include <LibHTML/DOM/HTMLBRElement.h>
#include <LibHTML/Layout/LayoutBreak.h>
HTMLBRElement::HTMLBRElement(Document& document, const String& tag_name)
: HTMLElement(document, tag_name)
{
}
HTMLBRElement::~HTMLBRElement()
{
}
RefPtr<LayoutNode> HTMLBRElement::create_layout_node(const StyleResolver&, const StyleProperties*) const
{
return adopt(*new LayoutBreak(*this));
}

17
Libraries/LibHTML/DOM/HTMLBRElement.h Normal file
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@ -0,0 +1,17 @@
#pragma once
#include <LibHTML/DOM/HTMLElement.h>
class HTMLBRElement final : public HTMLElement {
public:
HTMLBRElement(Document&, const String& tag_name);
virtual ~HTMLBRElement() override;
virtual RefPtr<LayoutNode> create_layout_node(const StyleResolver&, const StyleProperties* parent_style) const override;
};
template<>
inline bool is<HTMLBRElement>(const Node& node)
{
return is<Element>(node) && to<Element>(node).tag_name().to_lowercase() == "br";
}