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LibWeb: Fix box alignment when it has min-width or max-width in GFC

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Changing `try_compute_width()` to return width and margins, instead of
mutating them in the box's state makes it works in cases when box has
min-width or max-width and this function needs to be called multiple
times.

Fixes https://github.com/SerenityOS/serenity/issues/21598
This commit is contained in:
Aliaksandr Kalenik 2023-10-26 21:58:36 +02:00 committed by Andreas Kling
parent 895ec6ad09
commit d1a01c4c65
Notes: sideshowbarker 2024-07-17 01:00:06 +09:00 
Author: https://github.com/kalenikaliaksandr
Commit: https://github.com/SerenityOS/serenity/commit/d1a01c4c65
Pull-request: https://github.com/SerenityOS/serenity/pull/21608
Issue: https://github.com/SerenityOS/serenity/issues/21598
3 changed files with 75 additions and 28 deletions
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9
Tests/LibWeb/Layout/expected/grid/item-with-min-width-and-place-self-start.txt Normal file
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@ -0,0 +1,9 @@
Viewport <#document> at (0,0) content-size 800x600 children: not-inline
BlockContainer <html> at (0,0) content-size 800x216 [BFC] children: not-inline
Box <body> at (8,8) content-size 784x200 [GFC] children: not-inline
Box <section> at (8,8) content-size 784x200 flex-container(row) [FFC] children: not-inline
ViewportPaintable (Viewport<#document>) [0,0 800x600]
PaintableWithLines (BlockContainer<HTML>) [0,0 800x216]
PaintableBox (Box<BODY>) [8,8 784x200]
PaintableBox (Box<SECTION>) [8,8 784x200]

20
Tests/LibWeb/Layout/input/grid/item-with-min-width-and-place-self-start.html Normal file
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@ -0,0 +1,20 @@
<!DOCTYPE html><style>
* {
outline: 1px solid black !important;
}
html {
background: white;
}
body {
display: grid;
background: wheat;
}
section {
display: flex;
width: 100%;
min-width: 500px;
place-self: start;
background: pink;
height: 200px;
}
</style><body><section>

74
Userland/Libraries/LibWeb/Layout/GridFormattingContext.cpp
View File

@ -1577,71 +1577,89 @@ void GridFormattingContext::resolve_grid_item_widths()
auto const& computed_values = item.box->computed_values();
auto const& computed_width = computed_values.width();
auto try_compute_width = [&](CSSPixels a_width) {
CSSPixels width = a_width;
struct ItemAlignment {
CSSPixels margin_left;
CSSPixels margin_right;
CSSPixels width;
};
ItemAlignment initial {
.margin_left = box_state.margin_left,
.margin_right = box_state.margin_right,
.width = box_state.content_width()
};
auto try_compute_width = [&](CSSPixels a_width) -> ItemAlignment {
ItemAlignment result = initial;
result.width = a_width;
// Auto margins absorb positive free space prior to alignment via the box alignment properties.
auto free_space_left_for_margins = containing_block_width - width - box_state.border_left - box_state.border_right - box_state.padding_left - box_state.padding_right - box_state.margin_left - box_state.margin_right;
auto free_space_left_for_margins = containing_block_width - result.width - box_state.border_left - box_state.border_right - box_state.padding_left - box_state.padding_right - box_state.margin_left - box_state.margin_right;
if (computed_values.margin().left().is_auto() && computed_values.margin().right().is_auto()) {
box_state.margin_left = free_space_left_for_margins / 2;
box_state.margin_right = free_space_left_for_margins / 2;
result.margin_left = free_space_left_for_margins / 2;
result.margin_right = free_space_left_for_margins / 2;
} else if (computed_values.margin().left().is_auto()) {
box_state.margin_left = free_space_left_for_margins;
result.margin_left = free_space_left_for_margins;
} else if (computed_values.margin().right().is_auto()) {
box_state.margin_right = free_space_left_for_margins;
result.margin_right = free_space_left_for_margins;
} else if (computed_values.width().is_auto()) {
width += free_space_left_for_margins;
result.width += free_space_left_for_margins;
}
auto free_space_left_for_alignment = containing_block_width - a_width - box_state.border_left - box_state.border_right - box_state.padding_left - box_state.padding_right - box_state.margin_left - box_state.margin_right;
switch (justification_for_item(item.box)) {
case CSS::JustifyItems::Normal:
case CSS::JustifyItems::Stretch:
return width;
break;
case CSS::JustifyItems::Center:
box_state.margin_left += free_space_left_for_alignment / 2;
box_state.margin_right += free_space_left_for_alignment / 2;
return a_width;
result.margin_left += free_space_left_for_alignment / 2;
result.margin_right += free_space_left_for_alignment / 2;
result.width = a_width;
break;
case CSS::JustifyItems::Start:
case CSS::JustifyItems::FlexStart:
box_state.margin_right += free_space_left_for_alignment;
return a_width;
result.margin_right += free_space_left_for_alignment;
result.width = a_width;
break;
case CSS::JustifyItems::End:
case CSS::JustifyItems::FlexEnd:
box_state.margin_left += free_space_left_for_alignment;
return a_width;
result.margin_left += free_space_left_for_alignment;
result.width = a_width;
break;
default:
break;
}
return width;
return result;
};
CSSPixels used_width;
ItemAlignment used_alignment;
AvailableSpace available_space { AvailableSize::make_definite(containing_block_width), AvailableSize::make_indefinite() };
if (computed_width.is_auto()) {
used_width = try_compute_width(calculate_fit_content_width(item.box, available_space));
used_alignment = try_compute_width(calculate_fit_content_width(item.box, available_space));
} else if (computed_width.is_fit_content()) {
used_width = try_compute_width(calculate_fit_content_width(item.box, available_space));
used_alignment = try_compute_width(calculate_fit_content_width(item.box, available_space));
} else {
used_width = try_compute_width(computed_width.to_px(grid_container(), containing_block_width));
used_alignment = try_compute_width(computed_width.to_px(grid_container(), containing_block_width));
}
if (!should_treat_max_width_as_none(item.box, m_available_space->width)) {
auto max_width = try_compute_width(computed_values.max_width().to_px(grid_container(), containing_block_width));
if (used_width > max_width) {
used_width = max_width;
auto max_width_alignment = try_compute_width(computed_values.max_width().to_px(grid_container(), containing_block_width));
if (used_alignment.width > max_width_alignment.width) {
used_alignment = max_width_alignment;
}
}
if (!computed_values.min_width().is_auto()) {
auto min_width = try_compute_width(computed_values.min_width().to_px(grid_container(), containing_block_width));
if (used_width < min_width) {
used_width = min_width;
auto min_width_alignment = try_compute_width(computed_values.min_width().to_px(grid_container(), containing_block_width));
if (used_alignment.width < min_width_alignment.width) {
used_alignment = min_width_alignment;
}
}
box_state.set_content_width(used_width);
box_state.margin_left = used_alignment.margin_left;
box_state.margin_right = used_alignment.margin_right;
box_state.set_content_width(used_alignment.width);
}
}