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LibWeb: Fix absolute positioning issues

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Make sure the insets and margins calculated according to the spec are
not later ignored and ad-hoc recomputed in
layout_absolutely_positioned_element.

Use the static position calculation in a couple of places where the
spec (and comment) was indicating it should be used.

Fixes #19362
This commit is contained in:
Sebastian Zaha 2023-07-07 15:24:57 +02:00 • committed by Andreas Kling
parent 61fe7c230f
commit fd37ad3a84
8 changed files with 134 additions and 134 deletions
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92
Userland/Libraries/LibWeb/Layout/FormattingContext.cpp
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@ -578,13 +578,13 @@ void FormattingContext::compute_width_for_absolutely_positioned_non_replaced_ele
auto computed_left = computed_values.inset().left();
auto computed_right = computed_values.inset().right();
auto left = computed_values.inset().left().to_px(box, width_of_containing_block);
auto right = computed_values.inset().right().to_px(box, width_of_containing_block);
auto try_compute_width = [&](auto const& a_width) {
margin_left = computed_values.margin().left().resolved(box, width_of_containing_block_as_length);
margin_right = computed_values.margin().right().resolved(box, width_of_containing_block_as_length);
auto left = computed_values.inset().left().to_px(box, width_of_containing_block);
auto right = computed_values.inset().right().to_px(box, width_of_containing_block);
auto width = a_width;
auto solve_for_left = [&] {
@ -610,7 +610,8 @@ void FormattingContext::compute_width_for_absolutely_positioned_non_replaced_ele
// is 'ltr' set 'left' to the static position and apply rule number three below;
// otherwise, set 'right' to the static position and apply rule number one below.
// FIXME: This is very hackish.
left = 0;
auto static_position = calculate_static_position(box);
left = static_position.x();
goto Rule3;
}
@ -666,8 +667,8 @@ void FormattingContext::compute_width_for_absolutely_positioned_non_replaced_ele
// Then solve for 'left' (if 'direction is 'rtl') or 'right' (if 'direction' is 'ltr').
else if (computed_left.is_auto() && computed_right.is_auto() && !width.is_auto()) {
// FIXME: Check direction
// FIXME: Use the static-position containing block
left = 0;
auto static_position = calculate_static_position(box);
left = static_position.x();
right = solve_for_right();
}
@ -722,11 +723,10 @@ void FormattingContext::compute_width_for_absolutely_positioned_non_replaced_ele
auto& box_state = m_state.get_mutable(box);
box_state.set_content_width(used_width.to_px(box));
box_state.inset_left = left;
box_state.inset_right = right;
box_state.margin_left = margin_left.to_px(box);
box_state.margin_right = margin_right.to_px(box);
box_state.border_left = border_left;
box_state.border_right = border_right;
box_state.padding_left = padding_left;
box_state.padding_right = padding_right;
}
@ -1014,15 +1014,18 @@ void FormattingContext::compute_height_for_absolutely_positioned_non_replaced_el
// the final used values for vertical margin/border/padding.
auto& box_state = m_state.get_mutable(box);
box_state.set_content_height(used_height);
// do not set calculated insets or margins on the first pass, there will be a second pass
if (before_or_after_inside_layout == BeforeOrAfterInsideLayout::Before)
return;
box_state.inset_top = top.to_px(box, width_of_containing_block);
box_state.inset_bottom = bottom.to_px(box, width_of_containing_block);
box_state.margin_top = margin_top.to_px(box, width_of_containing_block);
box_state.margin_bottom = margin_bottom.to_px(box, width_of_containing_block);
box_state.border_top = box.computed_values().border_top().width;
box_state.border_bottom = box.computed_values().border_bottom().width;
box_state.padding_top = box.computed_values().padding().top().to_px(box, width_of_containing_block);
box_state.padding_bottom = box.computed_values().padding().bottom().to_px(box, width_of_containing_block);
// And here is where we assign the box's content height.
box_state.set_content_height(used_height);
}
// NOTE: This is different from content_box_rect_in_ancestor_coordinate_space() as this does *not* follow the containing block chain up, but rather the parent() chain.
@ -1077,9 +1080,9 @@ CSSPixelPoint FormattingContext::calculate_static_position(Box const& box) const
// Easy case: no previous sibling, we're at the top of the containing block.
}
} else {
x = m_state.get(box).margin_box_left();
x = m_state.get(box).margin_left;
// We're among block siblings, Y can be calculated easily.
y = m_state.get(box).margin_box_top();
y = m_state.get(box).margin_top;
}
auto offset_to_static_parent = content_box_rect_in_static_position_ancestor_coordinate_space(box, *box.containing_block());
return offset_to_static_parent.location().translated(x, y);
@ -1095,6 +1098,13 @@ void FormattingContext::layout_absolutely_positioned_element(Box const& box, Ava
auto width_of_containing_block_as_length = CSS::Length::make_px(width_of_containing_block);
auto height_of_containing_block_as_length = CSS::Length::make_px(height_of_containing_block);
// The border computed values are not changed by the compute_height & width calculations below.
// The spec only adjusts and computes sizes, insets and margins.
box_state.border_left = box.computed_values().border_left().width;
box_state.border_right = box.computed_values().border_right().width;
box_state.border_top = box.computed_values().border_top().width;
box_state.border_bottom = box.computed_values().border_bottom().width;
compute_width_for_absolutely_positioned_element(box, available_space);
// NOTE: We compute height before *and* after doing inside layout.
@ -1106,59 +1116,11 @@ void FormattingContext::layout_absolutely_positioned_element(Box const& box, Ava
compute_height_for_absolutely_positioned_element(box, available_space, BeforeOrAfterInsideLayout::After);
box_state.margin_top = box.computed_values().margin().top().to_px(box, width_of_containing_block);
box_state.margin_bottom = box.computed_values().margin().bottom().to_px(box, width_of_containing_block);
box_state.border_left = box.computed_values().border_left().width;
box_state.border_right = box.computed_values().border_right().width;
box_state.border_top = box.computed_values().border_top().width;
box_state.border_bottom = box.computed_values().border_bottom().width;
auto const& computed_left = box.computed_values().inset().left();
auto const& computed_right = box.computed_values().inset().right();
auto const& computed_top = box.computed_values().inset().top();
auto const& computed_bottom = box.computed_values().inset().bottom();
box_state.inset_left = computed_left.to_px(box, width_of_containing_block);
box_state.inset_top = computed_top.to_px(box, height_of_containing_block);
box_state.inset_right = computed_right.to_px(box, width_of_containing_block);
box_state.inset_bottom = computed_bottom.to_px(box, height_of_containing_block);
auto static_position = calculate_static_position(box);
CSSPixelPoint used_offset;
if (!computed_left.is_auto()) {
CSSPixels x_offset = box_state.inset_left
+ box_state.border_box_left();
used_offset.set_x(x_offset + box_state.margin_left);
} else if (!computed_right.is_auto()) {
CSSPixels x_offset = CSSPixels(0)
- box_state.inset_right
- box_state.border_box_right();
used_offset.set_x(width_of_containing_block + x_offset - box_state.content_width() - box_state.margin_right);
} else {
// NOTE: static position is content box position so border_box and margin should not be added
used_offset.set_x(static_position.x());
}
if (!computed_top.is_auto()) {
CSSPixels y_offset = box_state.inset_top
+ box_state.border_box_top();
used_offset.set_y(y_offset + box_state.margin_top);
} else if (!computed_bottom.is_auto()) {
CSSPixels y_offset = CSSPixels(0)
- box_state.inset_bottom
- box_state.border_box_bottom();
used_offset.set_y(height_of_containing_block + y_offset - box_state.content_height() - box_state.margin_bottom);
} else {
// NOTE: static position is content box position so border_box and margin should not be added
used_offset.set_y(static_position.y());
}
used_offset.set_x(box_state.inset_left + box_state.margin_box_left());
used_offset.set_y(box_state.inset_top + box_state.margin_box_top());
// NOTE: Absolutely positioned boxes are relative to the *padding edge* of the containing block.
used_offset.translate_by(-containing_block_state.padding_left, -containing_block_state.padding_top);
box_state.set_content_offset(used_offset);
if (independent_formatting_context)