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LibWeb: Clamp justification space between flex items to 0

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Before this change, it was possible for flex lines with negative
remaining space (due to overflowing items) to put a negative amount
of space between items for some values of `justify-content`.

This makes https://polar.sh/SerenityOS look much better :^)
This commit is contained in:
Andreas Kling 2024-01-25 12:51:33 +01:00
parent e668cdcf22
commit 1583e6ce07
Notes: sideshowbarker 2024-07-17 10:16:43 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/1583e6ce07
Pull-request: https://github.com/SerenityOS/serenity/pull/22934
3 changed files with 51 additions and 3 deletions
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19
Tests/LibWeb/Layout/expected/flex/space-between-with-negative-remaining-space-on-line.txt Normal file
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@ -0,0 +1,19 @@
Viewport <#document> at (0,0) content-size 800x600 children: not-inline
BlockContainer <html> at (0,0) content-size 800x116 [BFC] children: not-inline
Box <body> at (8,8) content-size 400x100 flex-container(row) [FFC] children: not-inline
Box <div.outer> at (8,8) content-size 200x100 flex-container(column) flex-item [FFC] children: not-inline
BlockContainer <div.upper> at (8,8) content-size 200x200 flex-item [BFC] children: not-inline
BlockContainer <div.spacer> at (8,8) content-size 200x200 children: not-inline
BlockContainer <div.lower> at (8,208) content-size 200x17 flex-item [BFC] children: inline
frag 0 from TextNode start: 0, length: 3, rect: [8,208 26.953125x17] baseline: 13.296875
"whf"
TextNode <#text>
ViewportPaintable (Viewport<#document>) [0,0 800x600]
PaintableWithLines (BlockContainer<HTML>) [0,0 800x116] overflow: [0,0 800x225]
PaintableBox (Box<BODY>) [8,8 400x100] overflow: [8,8 400x217]
PaintableBox (Box<DIV>.outer) [8,8 200x100] overflow: [8,8 200x217]
PaintableWithLines (BlockContainer<DIV>.upper) [8,8 200x200]
PaintableWithLines (BlockContainer<DIV>.spacer) [8,8 200x200]
PaintableWithLines (BlockContainer<DIV>.lower) [8,208 200x17]
TextPaintable (TextNode<#text>)

29
Tests/LibWeb/Layout/input/flex/space-between-with-negative-remaining-space-on-line.html Normal file
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@ -0,0 +1,29 @@
<!doctype html><style type="text/css">
html { background: white; }
* {
outline: 1px solid black;
}
body {
background: pink;
display: flex;
width: 400px;
height: 100px;
}
.outer {
display: flex;
flex-direction: column;
justify-content: space-between;
background: magenta;
}
.upper {
background: orange;
}
.lower {
background: yellow;
}
.spacer {
width: 200px;
height: 200px;
background: green;
}
</style><body><div class="outer"><div class="upper"><div class="spacer"></div></div><div class="lower">whf

6
Userland/Libraries/LibWeb/Layout/FlexFormattingContext.cpp
View File

@ -1230,11 +1230,11 @@ void FlexFormattingContext::distribute_any_remaining_free_space()
initial_offset = 0;
}
if (flex_line.remaining_free_space.has_value() && number_of_items > 1)
space_between_items = flex_line.remaining_free_space.value() / (number_of_items - 1);
space_between_items = max(CSSPixels(0), flex_line.remaining_free_space.value() / (number_of_items - 1));
break;
case CSS::JustifyContent::SpaceAround:
if (flex_line.remaining_free_space.has_value())
space_between_items = flex_line.remaining_free_space.value() / number_of_items;
space_between_items = max(CSSPixels(0), flex_line.remaining_free_space.value() / number_of_items);
if (is_direction_reverse()) {
initial_offset = inner_main_size(m_flex_container_state) - space_between_items / 2;
} else {
@ -1243,7 +1243,7 @@ void FlexFormattingContext::distribute_any_remaining_free_space()
break;
case CSS::JustifyContent::SpaceEvenly:
if (flex_line.remaining_free_space.has_value())
space_between_items = flex_line.remaining_free_space.value() / (number_of_items + 1);
space_between_items = max(CSSPixels(0), flex_line.remaining_free_space.value() / (number_of_items + 1));
if (is_direction_reverse()) {
initial_offset = inner_main_size(m_flex_container_state) - space_between_items;
} else {