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https://github.com/LadybirdBrowser/ladybird.git
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LibWeb: Make intrinsic heights dependent on available width
After speaking with fantasai at CSSWG about this, it turns out I had misunderstood intrinsic heights. I originally believed all intrinsic sizes had to be computed with no influence from the surrounding context. As it turns out, intrinsic heights *are* influenced by the available width, since it's needed to determine where lines break. The APIs for calculating min-content and max-content heights now take the available width as inputs. This instantly improves layout in many cases where we'd previously make things way too wide.
This commit is contained in:
parent
b4f9db84ca
commit
b13a8706e1
Notes:
sideshowbarker
2024-07-17 06:22:56 +09:00
Author: https://github.com/awesomekling Commit: https://github.com/SerenityOS/serenity/commit/b13a8706e1
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@ -311,7 +311,7 @@ void BlockFormattingContext::compute_height(Box const& box, AvailableSpace const
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height = compute_height_for_replaced_element(m_state, verify_cast<ReplacedBox>(box), available_space);
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} else {
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if (should_treat_height_as_auto(box, available_space)) {
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height = compute_auto_height_for_block_level_element(box);
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height = compute_auto_height_for_block_level_element(box, available_space);
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} else {
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height = computed_values.height().resolved(box, containing_block_height).to_px(box);
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}
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@ -86,8 +86,7 @@ void FlexFormattingContext::run(Box const& run_box, LayoutMode, AvailableSpace c
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m_available_space_for_flex_container = AxisAgnosticAvailableSpace {
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.main = is_row_layout() ? available_width : available_height,
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.cross = !is_row_layout() ? available_width : available_height,
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.width = available_width,
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.height = available_height,
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.space = { available_width, available_height },
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};
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// This implements https://www.w3.org/TR/css-flexbox-1/#layout-algorithm
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@ -95,6 +94,11 @@ void FlexFormattingContext::run(Box const& run_box, LayoutMode, AvailableSpace c
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// 1. Generate anonymous flex items
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generate_anonymous_flex_items();
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// 2. Determine the available main and cross space for the flex items
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float cross_min_size = has_cross_min_size(flex_container()) ? specified_cross_min_size(flex_container()) : 0;
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float cross_max_size = has_cross_max_size(flex_container()) ? specified_cross_max_size(flex_container()) : INFINITY;
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determine_available_space_for_items(AvailableSpace(available_width, available_height));
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{
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// https://drafts.csswg.org/css-flexbox-1/#definite-sizes
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// 3. If a single-line flex container has a definite cross size,
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@ -114,11 +118,6 @@ void FlexFormattingContext::run(Box const& run_box, LayoutMode, AvailableSpace c
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}
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}
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// 2. Determine the available main and cross space for the flex items
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float cross_min_size = has_cross_min_size(flex_container()) ? specified_cross_min_size(flex_container()) : 0;
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float cross_max_size = has_cross_max_size(flex_container()) ? specified_cross_max_size(flex_container()) : INFINITY;
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determine_available_space_for_items(AvailableSpace(available_width, available_height));
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// 3. Determine the flex base size and hypothetical main size of each item
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for (auto& flex_item : m_flex_items) {
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if (flex_item.box.is_replaced_box()) {
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@ -209,7 +208,7 @@ void FlexFormattingContext::run(Box const& run_box, LayoutMode, AvailableSpace c
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copy_dimensions_from_flex_items_to_boxes();
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for (auto& flex_item : m_flex_items) {
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auto& box_state = m_state.get(flex_item.box);
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if (auto independent_formatting_context = layout_inside(flex_item.box, LayoutMode::Normal, box_state.available_inner_space_or_constraints_from(AvailableSpace(m_available_space_for_flex_container->width, m_available_space_for_flex_container->height))))
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if (auto independent_formatting_context = layout_inside(flex_item.box, LayoutMode::Normal, box_state.available_inner_space_or_constraints_from(m_available_space_for_flex_container->space)))
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independent_formatting_context->parent_context_did_dimension_child_root_box();
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}
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@ -535,15 +534,13 @@ void FlexFormattingContext::determine_available_space_for_items(AvailableSpace c
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m_available_space_for_items = AxisAgnosticAvailableSpace {
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.main = *available_width_for_items,
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.cross = *available_height_for_items,
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.width = *available_width_for_items,
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.height = *available_height_for_items,
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.space = { *available_width_for_items, *available_height_for_items },
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};
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} else {
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m_available_space_for_items = AxisAgnosticAvailableSpace {
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.main = *available_height_for_items,
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.cross = *available_width_for_items,
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.width = *available_width_for_items,
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.height = *available_height_for_items,
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.space = { *available_width_for_items, *available_height_for_items },
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};
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}
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}
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@ -582,7 +579,7 @@ float FlexFormattingContext::calculate_indefinite_main_size(FlexItem const& item
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VERIFY(independent_formatting_context);
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box_state.set_content_width(fit_content_cross_size);
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independent_formatting_context->run(item.box, LayoutMode::Normal, AvailableSpace(m_available_space_for_items->width, m_available_space_for_items->height));
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independent_formatting_context->run(item.box, LayoutMode::Normal, m_available_space_for_items->space);
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return independent_formatting_context->automatic_content_height();
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}
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@ -780,11 +777,10 @@ void FlexFormattingContext::determine_main_size_of_flex_container()
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// FIXME: Once all parent contexts now how to size a given child, we can remove
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// `can_determine_size_of_child()`.
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if (parent()->can_determine_size_of_child()) {
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AvailableSpace available_space(m_available_space_for_flex_container->width, m_available_space_for_flex_container->height);
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if (is_row_layout()) {
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parent()->determine_width_of_child(flex_container(), available_space);
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parent()->determine_width_of_child(flex_container(), m_available_space_for_flex_container->space);
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} else {
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parent()->determine_height_of_child(flex_container(), available_space);
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parent()->determine_height_of_child(flex_container(), m_available_space_for_flex_container->space);
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}
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return;
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}
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@ -796,13 +792,13 @@ void FlexFormattingContext::determine_main_size_of_flex_container()
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if (is_row_layout()) {
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if (!flex_container().is_out_of_flow(*parent()) && m_state.get(*flex_container().containing_block()).has_definite_width()) {
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set_main_size(flex_container(), calculate_stretch_fit_width(flex_container(), m_available_space_for_flex_container->main));
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set_main_size(flex_container(), calculate_stretch_fit_width(flex_container(), m_available_space_for_flex_container->space.width));
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} else {
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set_main_size(flex_container(), calculate_max_content_width(flex_container()));
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}
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} else {
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if (!has_definite_main_size(flex_container()))
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set_main_size(flex_container(), calculate_max_content_height(flex_container()));
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set_main_size(flex_container(), calculate_max_content_height(flex_container(), m_available_space_for_flex_container->space.width));
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}
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}
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@ -1060,7 +1056,7 @@ void FlexFormattingContext::determine_hypothetical_cross_size_of_item(FlexItem&
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// NOTE: Flex items should always create an independent formatting context!
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VERIFY(independent_formatting_context);
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independent_formatting_context->run(item.box, LayoutMode::Normal, AvailableSpace(m_available_space_for_items->width, m_available_space_for_items->height));
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independent_formatting_context->run(item.box, LayoutMode::Normal, m_available_space_for_items->space);
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auto automatic_cross_size = is_row_layout() ? independent_formatting_context->automatic_content_height()
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: box_state.content_width();
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@ -1660,34 +1656,34 @@ float FlexFormattingContext::calculate_cross_max_content_contribution(FlexItem c
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float FlexFormattingContext::calculate_min_content_main_size(FlexItem const& item) const
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{
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return is_row_layout() ? calculate_min_content_width(item.box) : calculate_min_content_height(item.box);
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return is_row_layout() ? calculate_min_content_width(item.box) : calculate_min_content_height(item.box, m_available_space_for_items->space.width);
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}
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float FlexFormattingContext::calculate_fit_content_main_size(FlexItem const& item) const
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{
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return is_row_layout() ? calculate_fit_content_width(item.box, m_available_space_for_items->main)
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: calculate_fit_content_height(item.box, m_available_space_for_items->main);
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return is_row_layout() ? calculate_fit_content_width(item.box, m_state.get(item.box).available_inner_space_or_constraints_from(m_available_space_for_items->space))
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: calculate_fit_content_height(item.box, m_state.get(item.box).available_inner_space_or_constraints_from(m_available_space_for_items->space));
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}
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float FlexFormattingContext::calculate_fit_content_cross_size(FlexItem const& item) const
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{
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return !is_row_layout() ? calculate_fit_content_width(item.box, m_available_space_for_items->cross)
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: calculate_fit_content_height(item.box, m_available_space_for_items->cross);
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return !is_row_layout() ? calculate_fit_content_width(item.box, m_state.get(item.box).available_inner_space_or_constraints_from(m_available_space_for_items->space))
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: calculate_fit_content_height(item.box, m_state.get(item.box).available_inner_space_or_constraints_from(m_available_space_for_items->space));
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}
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float FlexFormattingContext::calculate_max_content_main_size(FlexItem const& item) const
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{
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return is_row_layout() ? calculate_max_content_width(item.box) : calculate_max_content_height(item.box);
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return is_row_layout() ? calculate_max_content_width(item.box) : calculate_max_content_height(item.box, m_available_space_for_items->space.width);
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}
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float FlexFormattingContext::calculate_min_content_cross_size(FlexItem const& item) const
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{
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return is_row_layout() ? calculate_min_content_height(item.box) : calculate_min_content_width(item.box);
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return is_row_layout() ? calculate_min_content_height(item.box, m_available_space_for_items->space.width) : calculate_min_content_width(item.box);
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}
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float FlexFormattingContext::calculate_max_content_cross_size(FlexItem const& item) const
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{
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return is_row_layout() ? calculate_max_content_height(item.box) : calculate_max_content_width(item.box);
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return is_row_layout() ? calculate_max_content_height(item.box, m_available_space_for_items->space.width) : calculate_max_content_width(item.box);
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}
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// https://drafts.csswg.org/css-flexbox-1/#stretched
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@ -185,8 +185,7 @@ private:
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struct AxisAgnosticAvailableSpace {
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AvailableSize main;
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AvailableSize cross;
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AvailableSize width;
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AvailableSize height;
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AvailableSpace space;
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};
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Optional<AxisAgnosticAvailableSpace> m_available_space_for_items;
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Optional<AxisAgnosticAvailableSpace> m_available_space_for_flex_container;
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@ -239,7 +239,7 @@ static Gfx::FloatSize solve_replaced_size_constraint(LayoutState const& state, f
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return { w, h };
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}
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float FormattingContext::compute_auto_height_for_block_level_element(Box const& box) const
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float FormattingContext::compute_auto_height_for_block_level_element(Box const& box, AvailableSpace const& available_space) const
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{
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if (creates_block_formatting_context(box))
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return compute_auto_height_for_block_formatting_context_root(verify_cast<BlockContainer>(box));
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@ -250,7 +250,7 @@ float FormattingContext::compute_auto_height_for_block_level_element(Box const&
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if (display.is_flex_inside()) {
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// https://drafts.csswg.org/css-flexbox-1/#algo-main-container
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// NOTE: The automatic block size of a block-level flex container is its max-content size.
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return calculate_max_content_height(box);
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return calculate_max_content_height(box, available_space.width);
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}
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// https://www.w3.org/TR/CSS22/visudet.html#normal-block
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@ -694,11 +694,11 @@ void FormattingContext::compute_height_for_absolutely_positioned_non_replaced_el
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box_state.padding_bottom = computed_values.padding().bottom().resolved(box, width_of_containing_block_as_length).to_px(box);
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if (computed_height.is_auto() && computed_top.is_auto() && computed_bottom.is_auto()) {
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tentative_height = CSS::Length(compute_auto_height_for_block_level_element(box), CSS::Length::Type::Px);
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tentative_height = CSS::Length(compute_auto_height_for_block_level_element(box, available_space), CSS::Length::Type::Px);
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}
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else if (computed_height.is_auto() && !computed_top.is_auto() && computed_bottom.is_auto()) {
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tentative_height = CSS::Length(compute_auto_height_for_block_level_element(box), CSS::Length::Type::Px);
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tentative_height = CSS::Length(compute_auto_height_for_block_level_element(box, available_space), CSS::Length::Type::Px);
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box_state.inset_bottom = height_of_containing_block - tentative_height.to_px(box) - used_top - box_state.margin_top - box_state.padding_top - box_state.border_top - box_state.margin_bottom - box_state.padding_bottom - box_state.border_bottom;
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}
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@ -926,30 +926,30 @@ float FormattingContext::calculate_fit_content_size(float min_content_size, floa
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return max_content_size;
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}
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float FormattingContext::calculate_fit_content_width(Layout::Box const& box, AvailableSize const& available_size) const
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float FormattingContext::calculate_fit_content_width(Layout::Box const& box, AvailableSpace const& available_space) const
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{
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// When sizing under a min-content constraint, equal to the min-content size.
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// NOTE: We check this first, to avoid needlessly calculating the max-content size.
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if (available_size.is_min_content())
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if (available_space.width.is_min_content())
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return calculate_min_content_width(box);
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if (available_size.is_max_content())
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if (available_space.width.is_max_content())
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return calculate_max_content_width(box);
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return calculate_fit_content_size(calculate_min_content_width(box), calculate_max_content_width(box), available_size);
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return calculate_fit_content_size(calculate_min_content_width(box), calculate_max_content_width(box), available_space.width);
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}
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float FormattingContext::calculate_fit_content_height(Layout::Box const& box, AvailableSize const& available_size) const
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float FormattingContext::calculate_fit_content_height(Layout::Box const& box, AvailableSpace const& available_space) const
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{
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// When sizing under a min-content constraint, equal to the min-content size.
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// NOTE: We check this first, to avoid needlessly calculating the max-content size.
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if (available_size.is_min_content())
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return calculate_min_content_height(box);
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if (available_space.height.is_min_content())
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return calculate_min_content_height(box, available_space.width);
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if (available_size.is_max_content())
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return calculate_max_content_height(box);
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if (available_space.height.is_max_content())
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return calculate_max_content_height(box, available_space.width);
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return calculate_fit_content_size(calculate_min_content_height(box), calculate_max_content_height(box), available_size);
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return calculate_fit_content_size(calculate_min_content_height(box, available_space.width), calculate_max_content_height(box, available_space.width), available_space.height);
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}
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float FormattingContext::calculate_min_content_width(Layout::Box const& box) const
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return *cache.max_content_width;
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}
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float FormattingContext::calculate_min_content_height(Layout::Box const& box) const
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float FormattingContext::calculate_min_content_height(Layout::Box const& box, AvailableSize const& available_width) const
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{
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if (box.has_intrinsic_height())
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return *box.intrinsic_height();
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@ -1047,9 +1047,7 @@ float FormattingContext::calculate_min_content_height(Layout::Box const& box) co
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auto context = const_cast<FormattingContext*>(this)->create_independent_formatting_context_if_needed(throwaway_state, box);
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VERIFY(context);
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auto available_width = AvailableSize::make_indefinite();
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auto available_height = AvailableSize::make_min_content();
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context->run(box, LayoutMode::IntrinsicSizing, AvailableSpace(available_width, available_height));
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context->run(box, LayoutMode::IntrinsicSizing, AvailableSpace(available_width, AvailableSize::make_min_content()));
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cache.min_content_height = context->automatic_content_height();
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@ -1062,7 +1060,7 @@ float FormattingContext::calculate_min_content_height(Layout::Box const& box) co
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return *cache.min_content_height;
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}
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float FormattingContext::calculate_max_content_height(Layout::Box const& box) const
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float FormattingContext::calculate_max_content_height(Layout::Box const& box, AvailableSize const& available_width) const
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{
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if (box.has_intrinsic_height())
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return *box.intrinsic_height();
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@ -1081,9 +1079,7 @@ float FormattingContext::calculate_max_content_height(Layout::Box const& box) co
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auto context = const_cast<FormattingContext*>(this)->create_independent_formatting_context_if_needed(throwaway_state, box);
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VERIFY(context);
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auto available_width = AvailableSize::make_indefinite();
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auto available_height = AvailableSize::make_max_content();
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context->run(box, LayoutMode::IntrinsicSizing, AvailableSpace(available_width, available_height));
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context->run(box, LayoutMode::IntrinsicSizing, AvailableSpace(available_width, AvailableSize::make_max_content()));
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cache.max_content_height = context->automatic_content_height();
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@ -54,11 +54,11 @@ public:
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float calculate_min_content_width(Layout::Box const&) const;
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float calculate_max_content_width(Layout::Box const&) const;
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float calculate_min_content_height(Layout::Box const&) const;
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float calculate_max_content_height(Layout::Box const&) const;
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float calculate_min_content_height(Layout::Box const&, AvailableSize const& available_width) const;
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float calculate_max_content_height(Layout::Box const&, AvailableSize const& available_width) const;
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float calculate_fit_content_height(Layout::Box const&, AvailableSize const&) const;
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float calculate_fit_content_width(Layout::Box const&, AvailableSize const&) const;
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float calculate_fit_content_height(Layout::Box const&, AvailableSpace const&) const;
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float calculate_fit_content_width(Layout::Box const&, AvailableSpace const&) const;
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virtual float greatest_child_width(Box const&);
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@ -99,7 +99,7 @@ protected:
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static float tentative_width_for_replaced_element(LayoutState const&, ReplacedBox const&, CSS::Size const& computed_width, AvailableSpace const&);
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static float tentative_height_for_replaced_element(LayoutState const&, ReplacedBox const&, CSS::Size const& computed_height, AvailableSpace const&);
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float compute_auto_height_for_block_formatting_context_root(BlockContainer const&) const;
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float compute_auto_height_for_block_level_element(Box const&) const;
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float compute_auto_height_for_block_level_element(Box const&, AvailableSpace const&) const;
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ShrinkToFitResult calculate_shrink_to_fit_widths(Box const&);
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