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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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16
Libraries/LibHTML/Layout/LayoutBreak.h Normal file
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#pragma once
#include <LibHTML/DOM/HTMLBRElement.h>
#include <LibHTML/Layout/LayoutNode.h>
class LayoutBreak final : public LayoutNode {
public:
explicit LayoutBreak(const HTMLBRElement&);
virtual ~LayoutBreak() override;
const HTMLBRElement& node() const { return to<HTMLBRElement>(*LayoutNode::node()); }
private:
virtual const char* class_name() const override { return "LayoutBreak"; }
virtual void split_into_lines(LayoutBlock&) override;
};