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LibWeb: Very basic support for CSS flex-direction

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The FFC now supports both vertical and horizontal flex layout, based on
the flex-direction property. It's still extremely naive, but at least
now you can be naive in two directions! :^)

This implementation of flexbox is going to take a lot of work, but at
least now we've gotten started.
This commit is contained in:
Andreas Kling 2021-01-18 18:02:23 +01:00
parent 3e8873b63e
commit 93831ef456
1 changed files with 30 additions and 7 deletions
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37
Userland/Libraries/LibWeb/Layout/FlexFormattingContext.cpp
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@ -41,22 +41,45 @@ FlexFormattingContext::~FlexFormattingContext()
void FlexFormattingContext::run(Box& box, LayoutMode layout_mode)
{
// FIXME: This is *extremely* naive and only supports flex items laid out on a single horizontal line.
// FIXME: This is *extremely* naive and only supports flex items laid out on a single line.
// First, compute the width of each flex item.
auto flex_direction = box.computed_values().flex_direction();
bool horizontal = flex_direction == CSS::FlexDirection::Row || flex_direction == CSS::FlexDirection::RowReverse;
auto available_width = box.containing_block()->width();
// First, compute the size of each flex item.
box.for_each_child_of_type<Box>([&](Box& child_box) {
auto shrink_to_fit_result = calculate_shrink_to_fit_widths(child_box);
auto shrink_to_fit_width = min(max(shrink_to_fit_result.preferred_minimum_width, 0.0f), shrink_to_fit_result.preferred_width);
layout_inside(child_box, layout_mode);
auto shrink_to_fit_width = min(max(shrink_to_fit_result.preferred_minimum_width, available_width), shrink_to_fit_result.preferred_width);
child_box.set_width(shrink_to_fit_width);
layout_inside(child_box, layout_mode);
});
// Then, place the items on a line.
// Then, place the items on a vertical or horizontal line.
float x = 0;
float y = 0;
float tallest_child_height = 0;
float widest_child_width = 0;
box.for_each_child_of_type<Box>([&](Box& child_box) {
child_box.set_offset(x, 0);
x += child_box.border_box_width();
child_box.set_offset(x, y);
tallest_child_height = max(tallest_child_height, child_box.height());
widest_child_width = max(widest_child_width, child_box.width());
if (horizontal)
x += child_box.margin_box_width();
else
y += child_box.margin_box_height();
});
// Then, compute the height of the entire flex container.
// FIXME: This is not correct height calculation..
if (horizontal) {
box.set_height(tallest_child_height);
box.set_width(x);
} else {
box.set_width(widest_child_width);
box.set_height(y);
}
}
}