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LibWeb: Create list-item markers during layout tree construction

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Previously, these were added during layout. This didn't fit into the new
world where layout doesn't mutate the tree incrementally, so this patch
adds logic to Layout::TreeBuilder for adding a marker to each list-item
box after its children have been constructed.
This commit is contained in:
Andreas Kling
2022-02-21 01:43:37 +01:00
parent c9700e100e
commit 92266d2247
8 changed files with 65 additions and 54 deletions
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39
Userland/Libraries/LibWeb/Layout/BlockFormattingContext.cpp
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@@ -405,10 +405,9 @@ void BlockFormattingContext::layout_block_level_children(BlockContainer const& b
if (is<ReplacedBox>(child_box) || is<BlockContainer>(child_box))
place_block_level_element_in_normal_flow_horizontally(child_box, block_container);
// FIXME: This should be factored differently. It's uncool that we mutate the tree *during* layout!
// Instead, we should generate the marker box during the tree build.
if (is<ListItemBox>(child_box))
verify_cast<ListItemBox>(child_box).layout_marker();
if (is<ListItemBox>(child_box)) {
layout_list_item_marker(static_cast<ListItemBox const&>(child_box));
}
content_height = max(content_height, box_state.offset.y() + box_state.content_height + box_state.margin_box_bottom());
content_width = max(content_width, box_state.content_width);
@@ -663,4 +662,36 @@ void BlockFormattingContext::layout_floating_child(Box const& box, BlockContaine
float_box(FloatSide::Right, m_right_floats);
}
}
void BlockFormattingContext::layout_list_item_marker(ListItemBox const& list_item_box)
{
if (!list_item_box.marker())
return;
auto& marker = *list_item_box.marker();
auto& marker_state = m_state.ensure(marker);
auto& list_item_state = m_state.ensure(list_item_box);
int image_width = 0;
int image_height = 0;
if (auto const* list_style_image = marker.list_style_image_bitmap()) {
image_width = list_style_image->rect().width();
image_height = list_style_image->rect().height();
}
if (marker.text().is_empty()) {
marker_state.content_width = image_width + 4;
} else {
auto text_width = marker.font().width(marker.text());
marker_state.content_width = image_width + text_width;
}
marker_state.content_height = max(image_height, marker.line_height());
marker_state.offset = { -(marker_state.content_width + 4), 0 };
if (marker_state.content_height > list_item_state.content_height)
list_item_state.content_height = marker_state.content_height;
}
}