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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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17
Libraries/LibHTML/DOM/HTMLBRElement.h Normal file
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#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";
}