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LibWeb: Basic support for display:inline-block with width:auto

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We now implement the somewhat fuzzy shrink-to-fit algorithm when laying
out inline-block elements with both block and inline children.

Shrink-to-fit works by doing two speculative layouts of the entire
subtree inside the current block, to compute two things:

1. Preferred minimum width: If we made a line break at every chance we
   had, how wide would the widest line be?
2. Preferred width: We break only when explicitly told to (e.g "<br>")
   How wide would the widest line be?

We then shrink the width of the inline-block element to an appropriate
value based on the above, taking the available width in the containing
block into consideration (sans all the box model fluff.)

To make the speculative layouts possible, plumb a LayoutMode enum
throughout the layout system since it needs to be respected in various
places.

Note that this is quite hackish and I'm sure there are smarter ways to
do a lot of this. But it does kinda work! :^)
This commit is contained in:
Andreas Kling 2020-05-26 21:53:10 +02:00
parent 4e8bcda4d1
commit f01af62313
24 changed files with 184 additions and 97 deletions
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6
Libraries/LibWeb/Layout/LayoutText.h
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@ -48,15 +48,15 @@ public:
void render_fragment(RenderingContext&, const LineBoxFragment&) const;
virtual void split_into_lines(LayoutBlock& container) override;
virtual void split_into_lines(LayoutBlock& container, LayoutMode) override;
const StyleProperties& style() const { return parent()->style(); }
private:
void split_into_lines_by_rules(LayoutBlock& container, bool do_collapse, bool do_wrap_lines, bool do_wrap_breaks);
void split_into_lines_by_rules(LayoutBlock& container, LayoutMode, bool do_collapse, bool do_wrap_lines, bool do_wrap_breaks);
template<typename Callback>
void for_each_chunk(Callback, bool do_wrap_lines, bool do_wrap_breaks) const;
void for_each_chunk(Callback, LayoutMode, bool do_wrap_lines, bool do_wrap_breaks) const;
String m_text_for_rendering;
};