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https://github.com/RGBCube/serenity
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LibWeb: Handle overlapping floating box and left margin
Allow the left margin of a box which creates a block formatting context to overlap with left floating boxes which are siblings in the document tree. Fixes #20233 and the comment layout on https://lobste.rs.
This commit is contained in:
Andi Gallo
Andreas Kling
parent
34c702e6e8
commit
6a17a30e2e
6 changed files with 100 additions and 2 deletions
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@ -8,12 +8,16 @@ Viewport <#document> at (0,0) content-size 800x600 children: not-inline
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BlockContainer <div.ab> at (108,8) content-size 684x17.46875 children: not-inline
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BlockContainer <(anonymous)> at (108,8) content-size 684x0 children: inline
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TextNode <#text>
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BlockContainer <div> at (108,8) content-size 684x0 children: inline
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TextNode <#text>
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BlockContainer <div.a> at (108,8) content-size 14.265625x17.46875 floating [BFC] children: inline
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line 0 width: 14.265625, height: 17.46875, bottom: 17.46875, baseline: 13.53125
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frag 0 from TextNode start: 0, length: 1, rect: [108,8 14.265625x17.46875]
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"A"
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TextNode <#text>
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TextNode <#text>
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BlockContainer <(anonymous)> at (108,8) content-size 684x0 children: inline
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TextNode <#text>
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BlockContainer <div.b> at (122.265625,8) content-size 669.734375x17.46875 [BFC] children: inline
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line 0 width: 9.34375, height: 17.46875, bottom: 17.46875, baseline: 13.53125
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frag 0 from TextNode start: 0, length: 1, rect: [122.265625,8 9.34375x17.46875]
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@ -0,0 +1,47 @@
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Viewport <#document> at (0,0) content-size 800x600 children: not-inline
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BlockContainer <html> at (0,0) content-size 800x600 [BFC] children: not-inline
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BlockContainer <body> at (8,8) content-size 784x34.9375 children: not-inline
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BlockContainer <div> at (8,8) content-size 784x34.9375 children: not-inline
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BlockContainer <(anonymous)> at (8,8) content-size 784x0 children: inline
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TextNode <#text>
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BlockContainer <div> at (8,8) content-size 784x0 children: inline
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TextNode <#text>
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BlockContainer <div.a> at (8,8) content-size 57.0625x34.9375 floating [BFC] children: not-inline
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BlockContainer <(anonymous)> at (8,8) content-size 57.0625x0 children: inline
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TextNode <#text>
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BlockContainer <div.a4> at (8,8) content-size 57.0625x17.46875 children: inline
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line 0 width: 57.0625, height: 17.46875, bottom: 17.46875, baseline: 13.53125
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frag 0 from TextNode start: 0, length: 4, rect: [8,8 57.0625x17.46875]
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"AAAA"
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TextNode <#text>
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BlockContainer <(anonymous)> at (8,25.46875) content-size 57.0625x0 children: inline
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TextNode <#text>
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BlockContainer <div> at (8,25.46875) content-size 57.0625x17.46875 children: inline
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line 0 width: 14.265625, height: 17.46875, bottom: 17.46875, baseline: 13.53125
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frag 0 from TextNode start: 0, length: 1, rect: [8,25.46875 14.265625x17.46875]
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"A"
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TextNode <#text>
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BlockContainer <(anonymous)> at (8,42.9375) content-size 57.0625x0 children: inline
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TextNode <#text>
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TextNode <#text>
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BlockContainer <(anonymous)> at (8,8) content-size 784x0 children: inline
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TextNode <#text>
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BlockContainer <div> at (108,8) content-size 684x34.9375 children: not-inline
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BlockContainer <(anonymous)> at (108,8) content-size 684x0 children: inline
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TextNode <#text>
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BlockContainer <div> at (108,8) content-size 684x17.46875 children: inline
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line 0 width: 9.34375, height: 17.46875, bottom: 17.46875, baseline: 13.53125
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frag 0 from TextNode start: 0, length: 1, rect: [108,8 9.34375x17.46875]
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"B"
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TextNode <#text>
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BlockContainer <(anonymous)> at (108,25.46875) content-size 684x0 children: inline
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TextNode <#text>
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BlockContainer <div.c> at (108,25.46875) content-size 684x17.46875 [BFC] children: inline
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line 0 width: 10.3125, height: 17.46875, bottom: 17.46875, baseline: 13.53125
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frag 0 from TextNode start: 0, length: 1, rect: [108,25.46875 10.3125x17.46875]
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"C"
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TextNode <#text>
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BlockContainer <(anonymous)> at (108,42.9375) content-size 684x0 children: inline
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TextNode <#text>
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BlockContainer <(anonymous)> at (8,42.9375) content-size 784x0 children: inline
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TextNode <#text>
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@ -20,7 +20,9 @@
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<body>
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<div class="ab">
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<div>
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<div class="a">A</div>
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</div>
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<div class="b">B</div>
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</div>
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@ -0,0 +1,26 @@
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<style>
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.a {
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float: left;
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}
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.a4 {
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display: block;
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}
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.c {
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overflow: hidden;
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}
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</style>
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<div>
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<div>
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<div class="a">
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<div class="a4">AAAA</div>
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<div>A</div>
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</div>
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</div>
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<div style="margin-left: 100px">
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<div>B</div>
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<div class="c">C</div>
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</div>
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</div>
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@ -802,6 +802,18 @@ void BlockFormattingContext::place_block_level_element_in_normal_flow_vertically
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box_state.set_content_offset(CSSPixelPoint { box_state.offset.x(), y });
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}
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// Returns whether the given box has the given ancestor on the path to root, ignoring the anonymous blocks.
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static bool box_has_ancestor_in_non_anonymous_containing_block_chain(Box const* box, Box const& ancestor, Box const& root)
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{
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Box const* current_ancestor = box ? box->non_anonymous_containing_block() : &root;
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while (current_ancestor != &root) {
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if (current_ancestor == &ancestor)
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return true;
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current_ancestor = current_ancestor->non_anonymous_containing_block();
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}
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return false;
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}
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void BlockFormattingContext::place_block_level_element_in_normal_flow_horizontally(Box const& child_box, AvailableSpace const& available_space)
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{
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auto& box_state = m_state.get_mutable(child_box);
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@ -814,7 +826,12 @@ void BlockFormattingContext::place_block_level_element_in_normal_flow_horizontal
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auto box_in_root_rect = content_box_rect_in_ancestor_coordinate_space(child_box, root());
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auto space_and_containing_margin = space_used_and_containing_margin_for_floats(box_in_root_rect.y());
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available_width_within_containing_block -= space_and_containing_margin.left_used_space + space_and_containing_margin.right_used_space;
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x += space_and_containing_margin.left_used_space;
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auto const& containing_box_state = m_state.get(*child_box.containing_block());
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if (box_has_ancestor_in_non_anonymous_containing_block_chain(space_and_containing_margin.matching_left_float_box, *child_box.non_anonymous_containing_block(), root()))
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x = space_and_containing_margin.left_used_space;
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else
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// If the floating box doesn't share a containing block with the child box, the child box margin should overlap with the width of the floating box.
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x = max(space_and_containing_margin.left_used_space - containing_box_state.margin_left, 0);
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}
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if (child_box.containing_block()->computed_values().text_align() == CSS::TextAlign::LibwebCenter) {
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@ -1056,6 +1073,7 @@ BlockFormattingContext::SpaceUsedAndContainingMarginForFloats BlockFormattingCon
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+ floating_box_state.content_width()
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+ floating_box_state.margin_box_right();
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space_and_containing_margin.left_total_containing_margin = offset_from_containing_block_chain_margins_between_here_and_root;
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space_and_containing_margin.matching_left_float_box = floating_box.box.ptr();
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break;
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}
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}
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@ -121,6 +121,7 @@ protected:
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// Each block in the containing chain adds its own margin and we store the total here.
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CSSPixels left_total_containing_margin;
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CSSPixels right_total_containing_margin;
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Box const* matching_left_float_box { nullptr };
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};
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struct ShrinkToFitResult {
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