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LibWeb: Move FFC layout algorithm step 12 to a separate function

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This commit is contained in:
Andreas Kling 2021-10-13 22:20:55 +02:00
parent 176f1ad214
commit e590e17b8a
2 changed files with 67 additions and 59 deletions
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124
Userland/Libraries/LibWeb/Layout/FlexFormattingContext.cpp
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@ -121,65 +121,7 @@ void FlexFormattingContext::run(Box& flex_container, LayoutMode)
determine_used_cross_size_of_each_flex_item(flex_container, flex_lines);
// 12. Distribute any remaining free space.
for (auto& flex_line : flex_lines) {
// 12.1.
float used_main_space = 0;
size_t auto_margins = 0;
for (auto& flex_item : flex_line.items) {
used_main_space += flex_item->main_size;
if (is_main_axis_margin_first_auto(flex_item->box))
++auto_margins;
if (is_main_axis_margin_second_auto(flex_item->box))
++auto_margins;
}
float remaining_free_space = main_available_size - used_main_space;
if (remaining_free_space > 0) {
float size_per_auto_margin = remaining_free_space / (float)auto_margins;
for (auto& flex_item : flex_line.items) {
if (is_main_axis_margin_first_auto(flex_item->box))
set_main_axis_first_margin(flex_item->box, size_per_auto_margin);
if (is_main_axis_margin_second_auto(flex_item->box))
set_main_axis_second_margin(flex_item->box, size_per_auto_margin);
}
} else {
for (auto& flex_item : flex_line.items) {
if (is_main_axis_margin_first_auto(flex_item->box))
set_main_axis_first_margin(flex_item->box, 0);
if (is_main_axis_margin_second_auto(flex_item->box))
set_main_axis_second_margin(flex_item->box, 0);
}
}
// 12.2.
float space_between_items = 0;
float space_before_first_item = 0;
auto number_of_items = flex_line.items.size();
switch (flex_container.computed_values().justify_content()) {
case CSS::JustifyContent::FlexStart:
break;
case CSS::JustifyContent::FlexEnd:
space_before_first_item = main_available_size - used_main_space;
break;
case CSS::JustifyContent::Center:
space_before_first_item = (main_available_size - used_main_space) / 2.0f;
break;
case CSS::JustifyContent::SpaceBetween:
space_between_items = remaining_free_space / (number_of_items - 1);
break;
case CSS::JustifyContent::SpaceAround:
space_between_items = remaining_free_space / number_of_items;
space_before_first_item = space_between_items / 2.0f;
break;
}
// FIXME: Support reverse
float main_offset = space_before_first_item;
for (auto& flex_item : flex_line.items) {
flex_item->main_offset = main_offset;
main_offset += flex_item->main_size + space_between_items;
}
}
distribute_any_remaining_free_space(flex_container, flex_lines, main_available_size);
// 13. Resolve cross-axis auto margins.
// FIXME: This
@ -944,4 +886,68 @@ void FlexFormattingContext::determine_used_cross_size_of_each_flex_item(Box cons
}
}
// https://www.w3.org/TR/css-flexbox-1/#algo-main-align
void FlexFormattingContext::distribute_any_remaining_free_space(Box const& flex_container, Vector<FlexLine>& flex_lines, float main_available_size)
{
for (auto& flex_line : flex_lines) {
// 12.1.
float used_main_space = 0;
size_t auto_margins = 0;
for (auto& flex_item : flex_line.items) {
used_main_space += flex_item->main_size;
if (is_main_axis_margin_first_auto(flex_item->box))
++auto_margins;
if (is_main_axis_margin_second_auto(flex_item->box))
++auto_margins;
}
float remaining_free_space = main_available_size - used_main_space;
if (remaining_free_space > 0) {
float size_per_auto_margin = remaining_free_space / (float)auto_margins;
for (auto& flex_item : flex_line.items) {
if (is_main_axis_margin_first_auto(flex_item->box))
set_main_axis_first_margin(flex_item->box, size_per_auto_margin);
if (is_main_axis_margin_second_auto(flex_item->box))
set_main_axis_second_margin(flex_item->box, size_per_auto_margin);
}
} else {
for (auto& flex_item : flex_line.items) {
if (is_main_axis_margin_first_auto(flex_item->box))
set_main_axis_first_margin(flex_item->box, 0);
if (is_main_axis_margin_second_auto(flex_item->box))
set_main_axis_second_margin(flex_item->box, 0);
}
}
// 12.2.
float space_between_items = 0;
float space_before_first_item = 0;
auto number_of_items = flex_line.items.size();
switch (flex_container.computed_values().justify_content()) {
case CSS::JustifyContent::FlexStart:
break;
case CSS::JustifyContent::FlexEnd:
space_before_first_item = main_available_size - used_main_space;
break;
case CSS::JustifyContent::Center:
space_before_first_item = (main_available_size - used_main_space) / 2.0f;
break;
case CSS::JustifyContent::SpaceBetween:
space_between_items = remaining_free_space / (number_of_items - 1);
break;
case CSS::JustifyContent::SpaceAround:
space_between_items = remaining_free_space / number_of_items;
space_before_first_item = space_between_items / 2.0f;
break;
}
// FIXME: Support reverse
float main_offset = space_before_first_item;
for (auto& flex_item : flex_line.items) {
flex_item->main_offset = main_offset;
main_offset += flex_item->main_size + space_between_items;
}
}
}
}