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LibWeb: Start making our layout system "transactional"

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This patch adds a map of Layout::Node to FormattingState::NodeState.
Instead of updating layout nodes incrementally as layout progresses
through the formatting contexts, all updates are now written to the
corresponding NodeState instead.

At the end of layout, FormattingState::commit() is called, which
transfers all the values from the NodeState objects to the Node.

This will soon allow us to perform completely non-destructive layouts
which don't affect the tree.

Note that there are many imperfections here, and still many places
where we assign to the NodeState, but later read directly from the Node
instead. I'm just committing at this stage to make subsequent diffs
easier to understand.
This commit is contained in:
Andreas Kling 2022-02-20 15:51:24 +01:00
parent 561612f219
commit c9700e100e
27 changed files with 754 additions and 571 deletions
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19
Userland/Libraries/LibWeb/Layout/InlineLevelIterator.h
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@ -28,7 +28,7 @@ public:
ForcedBreak,
};
Type type {};
Layout::Node* node { nullptr };
Layout::Node const* node { nullptr };
size_t offset_in_node { 0 };
size_t length_in_node { 0 };
float width { 0.0f };
@ -47,7 +47,7 @@ public:
}
};
InlineLevelIterator(Layout::InlineFormattingContext&, Layout::BlockContainer&, LayoutMode);
InlineLevelIterator(Layout::InlineFormattingContext&, FormattingState&, Layout::BlockContainer const&, LayoutMode);
Optional<Item> next(float available_width);
@ -55,19 +55,20 @@ private:
void skip_to_next();
void compute_next();
void enter_text_node(Layout::TextNode&, bool previous_is_empty_or_ends_in_whitespace);
void enter_text_node(Layout::TextNode const&, bool previous_is_empty_or_ends_in_whitespace);
void enter_node_with_box_model_metrics(Layout::NodeWithStyleAndBoxModelMetrics&);
void enter_node_with_box_model_metrics(Layout::NodeWithStyleAndBoxModelMetrics const&);
void exit_node_with_box_model_metrics();
void add_extra_box_model_metrics_to_item(Item&, bool add_leading_metrics, bool add_trailing_metrics);
Layout::Node* next_inline_node_in_pre_order(Layout::Node& current, Layout::Node const* stay_within);
Layout::Node const* next_inline_node_in_pre_order(Layout::Node const& current, Layout::Node const* stay_within);
Layout::InlineFormattingContext& m_inline_formatting_context;
Layout::BlockContainer& m_container;
Layout::Node* m_current_node { nullptr };
Layout::Node* m_next_node { nullptr };
Layout::FormattingState& m_formatting_state;
Layout::BlockContainer const& m_container;
Layout::Node const* m_current_node { nullptr };
Layout::Node const* m_next_node { nullptr };
LayoutMode const m_layout_mode;
struct TextNodeContext {
@ -91,7 +92,7 @@ private:
Optional<ExtraBoxMetrics> m_extra_leading_metrics;
Optional<ExtraBoxMetrics> m_extra_trailing_metrics;
Vector<NodeWithStyleAndBoxModelMetrics&> m_box_model_node_stack;
Vector<NodeWithStyleAndBoxModelMetrics const&> m_box_model_node_stack;
};
}