mirror of
https://github.com/LadybirdBrowser/ladybird.git
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27c68624b6
This patch reimplements inset property resolution based on the new CSS Positioned Layout specification. Nothing should change for left/right insets, but we gain support for top/bottom. :^)
906 lines
46 KiB
C++
906 lines
46 KiB
C++
/*
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* Copyright (c) 2020-2022, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/Dump.h>
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#include <LibWeb/Layout/BlockFormattingContext.h>
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#include <LibWeb/Layout/Box.h>
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#include <LibWeb/Layout/FlexFormattingContext.h>
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#include <LibWeb/Layout/FormattingContext.h>
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#include <LibWeb/Layout/InlineFormattingContext.h>
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#include <LibWeb/Layout/ReplacedBox.h>
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#include <LibWeb/Layout/SVGFormattingContext.h>
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#include <LibWeb/Layout/SVGSVGBox.h>
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#include <LibWeb/Layout/TableBox.h>
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#include <LibWeb/Layout/TableCellBox.h>
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#include <LibWeb/Layout/TableFormattingContext.h>
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namespace Web::Layout {
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FormattingContext::FormattingContext(Type type, FormattingState& state, Box const& context_box, FormattingContext* parent)
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: m_type(type)
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, m_parent(parent)
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, m_context_box(context_box)
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, m_state(state)
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{
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}
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FormattingContext::~FormattingContext() = default;
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bool FormattingContext::creates_block_formatting_context(const Box& box)
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{
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if (box.is_root_element())
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return true;
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if (box.is_floating())
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return true;
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if (box.is_absolutely_positioned())
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return true;
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if (box.is_inline_block())
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return true;
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if (is<TableCellBox>(box))
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return true;
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CSS::Overflow overflow_x = box.computed_values().overflow_x();
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if ((overflow_x != CSS::Overflow::Visible) && (overflow_x != CSS::Overflow::Clip))
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return true;
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CSS::Overflow overflow_y = box.computed_values().overflow_y();
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if ((overflow_y != CSS::Overflow::Visible) && (overflow_y != CSS::Overflow::Clip))
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return true;
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auto display = box.computed_values().display();
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if (display.is_flow_root_inside())
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return true;
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if (box.parent()) {
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auto parent_display = box.parent()->computed_values().display();
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if (parent_display.is_flex_inside()) {
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// FIXME: Flex items (direct children of the element with display: flex or inline-flex) if they are neither flex nor grid nor table containers themselves.
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if (!display.is_flex_inside())
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return true;
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}
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}
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// FIXME: table-caption
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// FIXME: anonymous table cells
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// FIXME: Elements with contain: layout, content, or paint.
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// FIXME: grid
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// FIXME: multicol
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// FIXME: column-span: all
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return false;
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}
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OwnPtr<FormattingContext> FormattingContext::create_independent_formatting_context_if_needed(FormattingState& state, Box const& child_box)
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{
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if (!child_box.can_have_children())
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return {};
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auto child_display = child_box.computed_values().display();
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if (is<SVGSVGBox>(child_box))
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return make<SVGFormattingContext>(state, child_box, this);
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if (child_display.is_flex_inside())
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return make<FlexFormattingContext>(state, child_box, this);
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if (creates_block_formatting_context(child_box))
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return make<BlockFormattingContext>(state, verify_cast<BlockContainer>(child_box), this);
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if (child_display.is_table_inside())
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return make<TableFormattingContext>(state, verify_cast<TableBox>(child_box), this);
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VERIFY(is_block_formatting_context());
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if (child_box.children_are_inline())
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return make<InlineFormattingContext>(state, verify_cast<BlockContainer>(child_box), static_cast<BlockFormattingContext&>(*this));
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// The child box is a block container that doesn't create its own BFC.
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// It will be formatted by this BFC.
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if (!child_display.is_flow_inside()) {
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dbgln("FIXME: Child box doesn't create BFC, but inside is also not flow! display={}", child_display.to_string());
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// HACK: Instead of crashing, create a dummy formatting context that does nothing.
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// FIXME: Remove this once it's no longer needed. It currently swallows problem with standalone
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// table-related boxes that don't get fixed up by CSS anonymous table box generation.
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struct DummyFormattingContext : public FormattingContext {
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DummyFormattingContext(FormattingState& state, Box const& box)
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: FormattingContext(Type::Block, state, box)
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{
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}
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virtual void run(Box const&, LayoutMode) override { }
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};
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return make<DummyFormattingContext>(state, child_box);
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}
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VERIFY(child_box.is_block_container());
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VERIFY(child_display.is_flow_inside());
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return {};
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}
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OwnPtr<FormattingContext> FormattingContext::layout_inside(Box const& child_box, LayoutMode layout_mode)
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{
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if (!child_box.can_have_children())
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return {};
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auto independent_formatting_context = create_independent_formatting_context_if_needed(m_state, child_box);
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if (independent_formatting_context)
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independent_formatting_context->run(child_box, layout_mode);
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else
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run(child_box, layout_mode);
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return independent_formatting_context;
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}
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float FormattingContext::greatest_child_width(Box const& box)
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{
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float max_width = 0;
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if (box.children_are_inline()) {
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for (auto& line_box : m_state.get(verify_cast<BlockContainer>(box)).line_boxes) {
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max_width = max(max_width, line_box.width());
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}
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} else {
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box.for_each_child_of_type<Box>([&](auto& child) {
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max_width = max(max_width, m_state.get(child).border_box_width());
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});
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}
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return max_width;
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}
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FormattingContext::ShrinkToFitResult FormattingContext::calculate_shrink_to_fit_widths(Box const& box)
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{
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auto [min_content, max_content] = calculate_intrinsic_sizes(box);
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return {
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.preferred_width = max_content.width(),
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.preferred_minimum_width = min_content.width(),
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};
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}
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static Gfx::FloatSize solve_replaced_size_constraint(FormattingState const& state, float w, float h, ReplacedBox const& box)
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{
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// 10.4 Minimum and maximum widths: 'min-width' and 'max-width'
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auto const& containing_block = *box.containing_block();
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auto const& containing_block_state = state.get(containing_block);
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auto width_of_containing_block = CSS::Length::make_px(containing_block_state.content_width);
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auto height_of_containing_block = CSS::Length::make_px(containing_block_state.content_height);
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auto specified_min_width = box.computed_values().min_width().has_value() ? box.computed_values().min_width()->resolved(box, width_of_containing_block).to_px(box) : 0;
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auto specified_max_width = box.computed_values().max_width().has_value() ? box.computed_values().max_width()->resolved(box, width_of_containing_block).to_px(box) : w;
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auto specified_min_height = box.computed_values().min_height().has_value() ? box.computed_values().min_height()->resolved(box, height_of_containing_block).to_px(box) : 0;
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auto specified_max_height = box.computed_values().max_height().has_value() ? box.computed_values().max_height()->resolved(box, height_of_containing_block).to_px(box) : h;
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auto min_width = min(specified_min_width, specified_max_width);
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auto max_width = max(specified_min_width, specified_max_width);
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auto min_height = min(specified_min_height, specified_max_height);
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auto max_height = max(specified_min_height, specified_max_height);
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if (w > max_width)
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return { w, max(max_width * h / w, min_height) };
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if (w < min_width)
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return { max_width, min(min_width * h / w, max_height) };
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if (h > max_height)
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return { max(max_height * w / h, min_width), max_height };
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if (h < min_height)
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return { min(min_height * w / h, max_width), min_height };
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if ((w > max_width && h > max_height) && (max_width / w < max_height / h))
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return { max_width, max(min_height, max_width * h / w) };
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if ((w > max_width && h > max_height) && (max_width / w > max_height / h))
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return { max(min_width, max_height * w / h), max_height };
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if ((w < min_width && h < min_height) && (min_width / w < min_height / h))
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return { min(max_width, min_height * w / h), min_height };
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if ((w < min_width && h < min_height) && (min_width / w > min_height / h))
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return { min_width, min(max_height, min_width * h / w) };
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if (w < min_width && h > max_height)
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return { min_width, max_height };
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if (w > max_width && h < min_height)
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return { max_width, min_height };
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return { w, h };
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}
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float FormattingContext::compute_auto_height_for_block_level_element(FormattingState const& state, Box const& box)
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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(state, verify_cast<BlockContainer>(box));
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auto const& box_state = state.get(box);
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// https://www.w3.org/TR/CSS22/visudet.html#normal-block
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// 10.6.3 Block-level non-replaced elements in normal flow when 'overflow' computes to 'visible'
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// The element's height is the distance from its top content edge to the first applicable of the following:
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// 1. the bottom edge of the last line box, if the box establishes a inline formatting context with one or more lines
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if (box.children_are_inline() && !box_state.line_boxes.is_empty()) {
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// Find the top content edge (if negative).
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float top_content_edge = 0;
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for (auto const& fragment : box_state.line_boxes.first().fragments()) {
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float fragment_top_content_edge = fragment.offset().y() - fragment.border_box_top();
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if (fragment_top_content_edge < top_content_edge)
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top_content_edge = fragment_top_content_edge;
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}
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return box_state.line_boxes.last().bottom() - top_content_edge;
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}
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// 2. the bottom edge of the bottom (possibly collapsed) margin of its last in-flow child, if the child's bottom margin does not collapse with the element's bottom margin
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// FIXME: 3. the bottom border edge of the last in-flow child whose top margin doesn't collapse with the element's bottom margin
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if (!box.children_are_inline()) {
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Optional<float> top;
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Optional<float> bottom;
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box.for_each_child_of_type<Box>([&](Layout::Box& child_box) {
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if (child_box.is_absolutely_positioned() || child_box.is_floating())
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return;
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// FIXME: Handle margin collapsing.
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auto const& child_box_state = state.get(child_box);
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float child_box_top = child_box_state.offset.y() - child_box_state.border_box_top();
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float child_box_bottom = child_box_state.offset.y() + child_box_state.content_height + child_box_state.margin_box_bottom();
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if (!top.has_value() || child_box_top < top.value())
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top = child_box_top;
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if (!bottom.has_value() || child_box_bottom > bottom.value())
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bottom = child_box_bottom;
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});
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return bottom.value_or(0) - top.value_or(0);
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}
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// 4. zero, otherwise
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return 0;
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}
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// https://www.w3.org/TR/CSS22/visudet.html#root-height
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float FormattingContext::compute_auto_height_for_block_formatting_context_root(FormattingState const& state, BlockContainer const& root)
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{
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// 10.6.7 'Auto' heights for block formatting context roots
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Optional<float> top;
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Optional<float> bottom;
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if (root.children_are_inline()) {
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// If it only has inline-level children, the height is the distance between
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// the top content edge and the bottom of the bottommost line box.
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auto const& line_boxes = state.get(root).line_boxes;
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top = 0;
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if (!line_boxes.is_empty()) {
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// Find the top edge (if negative).
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for (auto const& fragment : line_boxes.first().fragments()) {
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float fragment_top_content_edge = fragment.offset().y();
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if (!top.has_value() || fragment_top_content_edge < *top)
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top = fragment_top_content_edge;
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}
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// Find the bottom edge.
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bottom = line_boxes.last().bottom();
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}
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} else {
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// If it has block-level children, the height is the distance between
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// the top margin-edge of the topmost block-level child box
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// and the bottom margin-edge of the bottommost block-level child box.
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root.for_each_child_of_type<Box>([&](Layout::Box& child_box) {
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// Absolutely positioned children are ignored,
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// and relatively positioned boxes are considered without their offset.
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// Note that the child box may be an anonymous block box.
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if (child_box.is_absolutely_positioned())
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return IterationDecision::Continue;
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// FIXME: This doesn't look right.
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if ((root.computed_values().overflow_y() == CSS::Overflow::Visible) && child_box.is_floating())
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return IterationDecision::Continue;
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auto const& child_box_state = state.get(child_box);
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float child_box_top = child_box_state.offset.y() - child_box_state.margin_box_top();
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float child_box_bottom = child_box_state.offset.y() + child_box_state.content_height + child_box_state.margin_box_bottom();
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if (!top.has_value() || child_box_top < top.value())
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top = child_box_top;
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if (!bottom.has_value() || child_box_bottom > bottom.value())
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bottom = child_box_bottom;
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return IterationDecision::Continue;
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});
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}
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// In addition, if the element has any floating descendants
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// whose bottom margin edge is below the element's bottom content edge,
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// then the height is increased to include those edges.
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root.for_each_child_of_type<Box>([&](Layout::Box& child_box) {
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if (!child_box.is_floating())
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return IterationDecision::Continue;
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auto const& child_box_state = state.get(child_box);
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float child_box_bottom = child_box_state.offset.y() + child_box_state.content_height + child_box_state.margin_box_bottom();
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if (!bottom.has_value() || child_box_bottom > bottom.value())
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bottom = child_box_bottom;
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return IterationDecision::Continue;
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});
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return max(0, bottom.value_or(0) - top.value_or(0));
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}
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// 10.3.2 Inline, replaced elements, https://www.w3.org/TR/CSS22/visudet.html#inline-replaced-width
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float FormattingContext::tentative_width_for_replaced_element(FormattingState const& state, ReplacedBox const& box, CSS::Length const& computed_width)
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{
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auto const& containing_block = *box.containing_block();
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auto height_of_containing_block = CSS::Length::make_px(state.get(containing_block).content_height);
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auto computed_height = box.computed_values().height().has_value() ? box.computed_values().height()->resolved(box, height_of_containing_block).resolved(box) : CSS::Length::make_auto();
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float used_width = computed_width.to_px(box);
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// If 'height' and 'width' both have computed values of 'auto' and the element also has an intrinsic width,
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// then that intrinsic width is the used value of 'width'.
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if (computed_height.is_auto() && computed_width.is_auto() && box.has_intrinsic_width())
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return box.intrinsic_width().value();
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// If 'height' and 'width' both have computed values of 'auto' and the element has no intrinsic width,
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// but does have an intrinsic height and intrinsic ratio;
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// or if 'width' has a computed value of 'auto',
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// 'height' has some other computed value, and the element does have an intrinsic ratio; then the used value of 'width' is:
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//
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// (used height) * (intrinsic ratio)
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if ((computed_height.is_auto() && computed_width.is_auto() && !box.has_intrinsic_width() && box.has_intrinsic_height() && box.has_intrinsic_aspect_ratio())
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|| (computed_width.is_auto() && box.has_intrinsic_aspect_ratio())) {
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return compute_height_for_replaced_element(state, box) * box.intrinsic_aspect_ratio().value();
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}
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// If 'height' and 'width' both have computed values of 'auto' and the element has an intrinsic ratio but no intrinsic height or width,
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// then the used value of 'width' is undefined in CSS 2.2. However, it is suggested that, if the containing block's width does not itself
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// depend on the replaced element's width, then the used value of 'width' is calculated from the constraint equation used for block-level,
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// non-replaced elements in normal flow.
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// Otherwise, if 'width' has a computed value of 'auto', and the element has an intrinsic width, then that intrinsic width is the used value of 'width'.
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if (computed_width.is_auto() && box.has_intrinsic_width())
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return box.intrinsic_width().value();
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// Otherwise, if 'width' has a computed value of 'auto', but none of the conditions above are met, then the used value of 'width' becomes 300px.
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// If 300px is too wide to fit the device, UAs should use the width of the largest rectangle that has a 2:1 ratio and fits the device instead.
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if (computed_width.is_auto())
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return 300;
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return used_width;
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}
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void FormattingContext::compute_width_for_absolutely_positioned_element(Box const& box)
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{
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if (is<ReplacedBox>(box))
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compute_width_for_absolutely_positioned_replaced_element(verify_cast<ReplacedBox>(box));
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else
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compute_width_for_absolutely_positioned_non_replaced_element(box);
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}
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void FormattingContext::compute_height_for_absolutely_positioned_element(Box const& box)
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{
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if (is<ReplacedBox>(box))
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compute_height_for_absolutely_positioned_replaced_element(verify_cast<ReplacedBox>(box));
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else
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compute_height_for_absolutely_positioned_non_replaced_element(box);
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}
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float FormattingContext::compute_width_for_replaced_element(FormattingState const& state, ReplacedBox const& box)
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{
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// 10.3.4 Block-level, replaced elements in normal flow...
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// 10.3.2 Inline, replaced elements
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auto zero_value = CSS::Length::make_px(0);
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auto const& containing_block = *box.containing_block();
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auto width_of_containing_block = CSS::Length::make_px(state.get(containing_block).content_width);
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auto margin_left = box.computed_values().margin().left.resolved(box, width_of_containing_block).resolved(box);
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auto margin_right = box.computed_values().margin().right.resolved(box, width_of_containing_block).resolved(box);
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// A computed value of 'auto' for 'margin-left' or 'margin-right' becomes a used value of '0'.
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if (margin_left.is_auto())
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margin_left = zero_value;
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if (margin_right.is_auto())
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margin_right = zero_value;
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auto specified_width = box.computed_values().width().has_value() ? box.computed_values().width()->resolved(box, width_of_containing_block).resolved(box) : CSS::Length::make_auto();
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// 1. The tentative used width is calculated (without 'min-width' and 'max-width')
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auto used_width = tentative_width_for_replaced_element(state, box, specified_width);
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// 2. The tentative used width is greater than 'max-width', the rules above are applied again,
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// but this time using the computed value of 'max-width' as the computed value for 'width'.
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auto specified_max_width = box.computed_values().max_width().has_value() ? box.computed_values().max_width()->resolved(box, width_of_containing_block).resolved(box) : CSS::Length::make_auto();
|
|
if (!specified_max_width.is_auto()) {
|
|
if (used_width > specified_max_width.to_px(box)) {
|
|
used_width = tentative_width_for_replaced_element(state, box, specified_max_width);
|
|
}
|
|
}
|
|
|
|
// 3. If the resulting width is smaller than 'min-width', the rules above are applied again,
|
|
// but this time using the value of 'min-width' as the computed value for 'width'.
|
|
auto specified_min_width = box.computed_values().min_width().has_value() ? box.computed_values().min_width()->resolved(box, width_of_containing_block).resolved(box) : CSS::Length::make_auto();
|
|
if (!specified_min_width.is_auto()) {
|
|
if (used_width < specified_min_width.to_px(box)) {
|
|
used_width = tentative_width_for_replaced_element(state, box, specified_min_width);
|
|
}
|
|
}
|
|
|
|
return used_width;
|
|
}
|
|
|
|
// 10.6.2 Inline replaced elements, block-level replaced elements in normal flow, 'inline-block' replaced elements in normal flow and floating replaced elements
|
|
// https://www.w3.org/TR/CSS22/visudet.html#inline-replaced-height
|
|
float FormattingContext::tentative_height_for_replaced_element(FormattingState const& state, ReplacedBox const& box, CSS::Length const& computed_height)
|
|
{
|
|
auto const& containing_block = *box.containing_block();
|
|
auto width_of_containing_block = CSS::Length::make_px(state.get(containing_block).content_width);
|
|
auto computed_width = box.computed_values().width().has_value() ? box.computed_values().width()->resolved(box, width_of_containing_block).resolved(box) : CSS::Length::make_auto();
|
|
|
|
// If 'height' and 'width' both have computed values of 'auto' and the element also has
|
|
// an intrinsic height, then that intrinsic height is the used value of 'height'.
|
|
if (computed_width.is_auto() && computed_height.is_auto() && box.has_intrinsic_height())
|
|
return box.intrinsic_height().value();
|
|
|
|
// Otherwise, if 'height' has a computed value of 'auto', and the element has an intrinsic ratio then the used value of 'height' is:
|
|
//
|
|
// (used width) / (intrinsic ratio)
|
|
if (computed_height.is_auto() && box.has_intrinsic_aspect_ratio())
|
|
return compute_width_for_replaced_element(state, box) / box.intrinsic_aspect_ratio().value();
|
|
|
|
// Otherwise, if 'height' has a computed value of 'auto', and the element has an intrinsic height, then that intrinsic height is the used value of 'height'.
|
|
if (computed_height.is_auto() && box.has_intrinsic_height())
|
|
return box.intrinsic_height().value();
|
|
|
|
// Otherwise, if 'height' has a computed value of 'auto', but none of the conditions above are met,
|
|
// then the used value of 'height' must be set to the height of the largest rectangle that has a 2:1 ratio, has a height not greater than 150px,
|
|
// and has a width not greater than the device width.
|
|
if (computed_height.is_auto())
|
|
return 150;
|
|
|
|
return computed_height.to_px(box);
|
|
}
|
|
|
|
float FormattingContext::compute_height_for_replaced_element(FormattingState const& state, ReplacedBox const& box)
|
|
{
|
|
// 10.6.2 Inline replaced elements, block-level replaced elements in normal flow,
|
|
// 'inline-block' replaced elements in normal flow and floating replaced elements
|
|
|
|
auto const& containing_block = *box.containing_block();
|
|
auto const& containing_block_state = state.get(containing_block);
|
|
auto width_of_containing_block = CSS::Length::make_px(containing_block_state.content_width);
|
|
auto height_of_containing_block = CSS::Length::make_px(containing_block_state.content_height);
|
|
auto specified_width = box.computed_values().width().has_value() ? box.computed_values().width()->resolved(box, width_of_containing_block).resolved(box) : CSS::Length::make_auto();
|
|
auto specified_height = box.computed_values().height().has_value() ? box.computed_values().height()->resolved(box, height_of_containing_block).resolved(box) : CSS::Length::make_auto();
|
|
|
|
float used_height = tentative_height_for_replaced_element(state, box, specified_height);
|
|
|
|
if (specified_width.is_auto() && specified_height.is_auto() && box.has_intrinsic_aspect_ratio()) {
|
|
float w = tentative_width_for_replaced_element(state, box, specified_width);
|
|
float h = used_height;
|
|
used_height = solve_replaced_size_constraint(state, w, h, box).height();
|
|
}
|
|
|
|
return used_height;
|
|
}
|
|
|
|
void FormattingContext::compute_width_for_absolutely_positioned_non_replaced_element(Box const& box)
|
|
{
|
|
auto& containing_block_state = m_state.get(*box.containing_block());
|
|
auto& box_state = m_state.get_mutable(box);
|
|
|
|
auto width_of_containing_block = CSS::Length::make_px(containing_block_state.content_width);
|
|
auto& computed_values = box.computed_values();
|
|
auto zero_value = CSS::Length::make_px(0);
|
|
|
|
auto margin_left = CSS::Length::make_auto();
|
|
auto margin_right = CSS::Length::make_auto();
|
|
const auto border_left = computed_values.border_left().width;
|
|
const auto border_right = computed_values.border_right().width;
|
|
const auto padding_left = computed_values.padding().left.resolved(box, width_of_containing_block).to_px(box);
|
|
const auto padding_right = computed_values.padding().right.resolved(box, width_of_containing_block).to_px(box);
|
|
|
|
auto try_compute_width = [&](const auto& a_width) {
|
|
margin_left = computed_values.margin().left.resolved(box, width_of_containing_block).resolved(box);
|
|
margin_right = computed_values.margin().right.resolved(box, width_of_containing_block).resolved(box);
|
|
|
|
auto left = computed_values.inset().left.resolved(box, width_of_containing_block).resolved(box);
|
|
auto right = computed_values.inset().right.resolved(box, width_of_containing_block).resolved(box);
|
|
auto width = a_width;
|
|
|
|
auto solve_for_left = [&] {
|
|
return CSS::Length(containing_block_state.content_width - margin_left.to_px(box) - border_left - padding_left - width.to_px(box) - padding_right - border_right - margin_right.to_px(box) - right.to_px(box), CSS::Length::Type::Px);
|
|
};
|
|
|
|
auto solve_for_width = [&] {
|
|
return CSS::Length(containing_block_state.content_width - left.to_px(box) - margin_left.to_px(box) - border_left - padding_left - padding_right - border_right - margin_right.to_px(box) - right.to_px(box), CSS::Length::Type::Px);
|
|
};
|
|
|
|
auto solve_for_right = [&] {
|
|
return CSS::Length(containing_block_state.content_width - left.to_px(box) - margin_left.to_px(box) - border_left - padding_left - width.to_px(box) - padding_right - border_right - margin_right.to_px(box), CSS::Length::Type::Px);
|
|
};
|
|
|
|
// If all three of 'left', 'width', and 'right' are 'auto':
|
|
if (left.is_auto() && width.is_auto() && right.is_auto()) {
|
|
// First set any 'auto' values for 'margin-left' and 'margin-right' to 0.
|
|
if (margin_left.is_auto())
|
|
margin_left = CSS::Length::make_px(0);
|
|
if (margin_right.is_auto())
|
|
margin_right = CSS::Length::make_px(0);
|
|
// Then, if the 'direction' property of the element establishing the static-position containing block
|
|
// 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 = CSS::Length::make_px(0);
|
|
goto Rule3;
|
|
}
|
|
|
|
if (!left.is_auto() && !width.is_auto() && !right.is_auto()) {
|
|
// FIXME: This should be solved in a more complicated way.
|
|
return width;
|
|
}
|
|
|
|
if (margin_left.is_auto())
|
|
margin_left = CSS::Length::make_px(0);
|
|
if (margin_right.is_auto())
|
|
margin_right = CSS::Length::make_px(0);
|
|
|
|
// 1. 'left' and 'width' are 'auto' and 'right' is not 'auto',
|
|
// then the width is shrink-to-fit. Then solve for 'left'
|
|
if (left.is_auto() && width.is_auto() && !right.is_auto()) {
|
|
auto result = calculate_shrink_to_fit_widths(box);
|
|
solve_for_left();
|
|
auto available_width = solve_for_width();
|
|
width = CSS::Length(min(max(result.preferred_minimum_width, available_width.to_px(box)), result.preferred_width), CSS::Length::Type::Px);
|
|
}
|
|
|
|
// 2. 'left' and 'right' are 'auto' and 'width' is not 'auto',
|
|
// then if the 'direction' property of the element establishing
|
|
// the static-position containing block is 'ltr' set 'left'
|
|
// to the static position, otherwise set 'right' to the static position.
|
|
// Then solve for 'left' (if 'direction is 'rtl') or 'right' (if 'direction' is 'ltr').
|
|
else if (left.is_auto() && right.is_auto() && !width.is_auto()) {
|
|
// FIXME: Check direction
|
|
// FIXME: Use the static-position containing block
|
|
left = zero_value;
|
|
right = solve_for_right();
|
|
}
|
|
|
|
// 3. 'width' and 'right' are 'auto' and 'left' is not 'auto',
|
|
// then the width is shrink-to-fit. Then solve for 'right'
|
|
else if (width.is_auto() && right.is_auto() && !left.is_auto()) {
|
|
Rule3:
|
|
auto result = calculate_shrink_to_fit_widths(box);
|
|
auto available_width = solve_for_width();
|
|
width = CSS::Length(min(max(result.preferred_minimum_width, available_width.to_px(box)), result.preferred_width), CSS::Length::Type::Px);
|
|
right = solve_for_right();
|
|
}
|
|
|
|
// 4. 'left' is 'auto', 'width' and 'right' are not 'auto', then solve for 'left'
|
|
else if (left.is_auto() && !width.is_auto() && !right.is_auto()) {
|
|
left = solve_for_left();
|
|
}
|
|
|
|
// 5. 'width' is 'auto', 'left' and 'right' are not 'auto', then solve for 'width'
|
|
else if (width.is_auto() && !left.is_auto() && !right.is_auto()) {
|
|
width = solve_for_width();
|
|
}
|
|
|
|
// 6. 'right' is 'auto', 'left' and 'width' are not 'auto', then solve for 'right'
|
|
else if (right.is_auto() && !left.is_auto() && !width.is_auto()) {
|
|
right = solve_for_right();
|
|
}
|
|
|
|
return width;
|
|
};
|
|
|
|
auto specified_width = computed_values.width().has_value() ? computed_values.width()->resolved(box, width_of_containing_block).resolved(box) : CSS::Length::make_auto();
|
|
|
|
// 1. The tentative used width is calculated (without 'min-width' and 'max-width')
|
|
auto used_width = try_compute_width(specified_width);
|
|
|
|
// 2. The tentative used width is greater than 'max-width', the rules above are applied again,
|
|
// but this time using the computed value of 'max-width' as the computed value for 'width'.
|
|
auto specified_max_width = computed_values.max_width().has_value() ? computed_values.max_width()->resolved(box, width_of_containing_block).resolved(box) : CSS::Length::make_auto();
|
|
if (!specified_max_width.is_auto()) {
|
|
if (used_width.to_px(box) > specified_max_width.to_px(box)) {
|
|
used_width = try_compute_width(specified_max_width);
|
|
}
|
|
}
|
|
|
|
// 3. If the resulting width is smaller than 'min-width', the rules above are applied again,
|
|
// but this time using the value of 'min-width' as the computed value for 'width'.
|
|
auto specified_min_width = computed_values.min_width().has_value() ? computed_values.min_width()->resolved(box, width_of_containing_block).resolved(box) : CSS::Length::make_auto();
|
|
if (!specified_min_width.is_auto()) {
|
|
if (used_width.to_px(box) < specified_min_width.to_px(box)) {
|
|
used_width = try_compute_width(specified_min_width);
|
|
}
|
|
}
|
|
|
|
box_state.content_width = used_width.to_px(box);
|
|
|
|
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;
|
|
}
|
|
|
|
void FormattingContext::compute_width_for_absolutely_positioned_replaced_element(ReplacedBox const& box)
|
|
{
|
|
// 10.3.8 Absolutely positioned, replaced elements
|
|
// The used value of 'width' is determined as for inline replaced elements.
|
|
// FIXME: This const_cast is gross.
|
|
const_cast<ReplacedBox&>(box).prepare_for_replaced_layout();
|
|
m_state.get_mutable(box).content_width = compute_width_for_replaced_element(m_state, box);
|
|
}
|
|
|
|
// https://www.w3.org/TR/CSS22/visudet.html#abs-non-replaced-height
|
|
void FormattingContext::compute_height_for_absolutely_positioned_non_replaced_element(Box const& box)
|
|
{
|
|
// 10.6.4 Absolutely positioned, non-replaced elements
|
|
|
|
// FIXME: The section below is partly on-spec, partly ad-hoc.
|
|
auto& computed_values = box.computed_values();
|
|
auto const& containing_block = *box.containing_block();
|
|
auto const& containing_block_state = m_state.get(containing_block);
|
|
auto& box_state = m_state.get_mutable(box);
|
|
auto width_of_containing_block = CSS::Length::make_px(containing_block_state.content_width);
|
|
auto height_of_containing_block = CSS::Length::make_px(containing_block_state.content_height);
|
|
|
|
CSS::Length specified_top = computed_values.inset().top.resolved(box, height_of_containing_block).resolved(box);
|
|
CSS::Length specified_bottom = computed_values.inset().bottom.resolved(box, height_of_containing_block).resolved(box);
|
|
CSS::Length specified_height = CSS::Length::make_auto();
|
|
|
|
if (computed_values.height().has_value() && computed_values.height()->is_percentage()
|
|
&& !(containing_block.computed_values().height().has_value() && containing_block.computed_values().height()->is_length() && containing_block.computed_values().height()->length().is_absolute())) {
|
|
// specified_height is already auto
|
|
} else {
|
|
specified_height = computed_values.height().has_value() ? computed_values.height()->resolved(box, height_of_containing_block).resolved(box) : CSS::Length::make_auto();
|
|
}
|
|
|
|
auto specified_max_height = computed_values.max_height().has_value() ? computed_values.max_height()->resolved(box, height_of_containing_block).resolved(box) : CSS::Length::make_auto();
|
|
auto specified_min_height = computed_values.min_height().has_value() ? computed_values.min_height()->resolved(box, height_of_containing_block).resolved(box) : CSS::Length::make_auto();
|
|
|
|
box_state.margin_top = computed_values.margin().top.resolved(box, width_of_containing_block).to_px(box);
|
|
box_state.margin_bottom = computed_values.margin().bottom.resolved(box, width_of_containing_block).to_px(box);
|
|
box_state.border_top = computed_values.border_top().width;
|
|
box_state.border_bottom = computed_values.border_bottom().width;
|
|
box_state.padding_top = computed_values.padding().top.resolved(box, width_of_containing_block).to_px(box);
|
|
box_state.padding_bottom = computed_values.padding().bottom.resolved(box, width_of_containing_block).to_px(box);
|
|
|
|
if (specified_height.is_auto() && specified_top.is_auto() && specified_bottom.is_auto()) {
|
|
specified_height = CSS::Length(compute_auto_height_for_block_level_element(m_state, box), CSS::Length::Type::Px);
|
|
}
|
|
|
|
else if (specified_height.is_auto() && !specified_top.is_auto() && specified_bottom.is_auto()) {
|
|
specified_height = CSS::Length(compute_auto_height_for_block_level_element(m_state, box), CSS::Length::Type::Px);
|
|
box_state.inset_bottom = containing_block_state.content_height - specified_height.to_px(box) - specified_top.to_px(box) - box_state.margin_top - box_state.padding_top - box_state.border_top - box_state.margin_bottom - box_state.padding_bottom - box_state.border_bottom;
|
|
}
|
|
|
|
else if (specified_height.is_auto() && !specified_top.is_auto() && !specified_bottom.is_auto()) {
|
|
specified_height = CSS::Length(containing_block_state.content_height - specified_top.to_px(box) - box_state.margin_top - box_state.padding_top - box_state.border_top - specified_bottom.to_px(box) - box_state.margin_bottom - box_state.padding_bottom - box_state.border_bottom, CSS::Length::Type::Px);
|
|
}
|
|
|
|
if (!specified_height.is_auto()) {
|
|
float used_height = specified_height.to_px(box);
|
|
if (!specified_max_height.is_auto())
|
|
used_height = min(used_height, specified_max_height.to_px(box));
|
|
if (!specified_min_height.is_auto())
|
|
used_height = max(used_height, specified_min_height.to_px(box));
|
|
box_state.content_height = used_height;
|
|
}
|
|
}
|
|
|
|
void FormattingContext::layout_absolutely_positioned_element(Box const& box)
|
|
{
|
|
auto const& containing_block_state = m_state.get(*box.containing_block());
|
|
auto width_of_containing_block = CSS::Length::make_px(containing_block_state.content_width);
|
|
auto height_of_containing_block = CSS::Length::make_px(containing_block_state.content_height);
|
|
auto& box_state = m_state.get_mutable(box);
|
|
|
|
auto specified_width = box.computed_values().width().has_value() ? box.computed_values().width()->resolved(box, width_of_containing_block).resolved(box) : CSS::Length::make_auto();
|
|
|
|
compute_width_for_absolutely_positioned_element(box);
|
|
auto independent_formatting_context = layout_inside(box, LayoutMode::Normal);
|
|
compute_height_for_absolutely_positioned_element(box);
|
|
|
|
box_state.margin_left = box.computed_values().margin().left.resolved(box, width_of_containing_block).to_px(box);
|
|
box_state.margin_top = box.computed_values().margin().top.resolved(box, height_of_containing_block).to_px(box);
|
|
box_state.margin_right = box.computed_values().margin().right.resolved(box, width_of_containing_block).to_px(box);
|
|
box_state.margin_bottom = box.computed_values().margin().bottom.resolved(box, height_of_containing_block).to_px(box);
|
|
|
|
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;
|
|
|
|
box_state.inset_left = box.computed_values().inset().left.resolved(box, width_of_containing_block).to_px(box);
|
|
box_state.inset_top = box.computed_values().inset().top.resolved(box, height_of_containing_block).to_px(box);
|
|
box_state.inset_right = box.computed_values().inset().right.resolved(box, width_of_containing_block).to_px(box);
|
|
box_state.inset_bottom = box.computed_values().inset().bottom.resolved(box, height_of_containing_block).to_px(box);
|
|
|
|
auto is_auto = [](auto const& length_percentage) {
|
|
return length_percentage.is_length() && length_percentage.length().is_auto();
|
|
};
|
|
|
|
if (is_auto(box.computed_values().inset().left) && specified_width.is_auto() && is_auto(box.computed_values().inset().right)) {
|
|
if (is_auto(box.computed_values().margin().left))
|
|
box_state.margin_left = 0;
|
|
if (is_auto(box.computed_values().margin().right))
|
|
box_state.margin_right = 0;
|
|
}
|
|
|
|
Gfx::FloatPoint used_offset;
|
|
|
|
if (!is_auto(box.computed_values().inset().left)) {
|
|
float x_offset = box_state.inset_left
|
|
+ box_state.border_box_left();
|
|
used_offset.set_x(x_offset + box_state.margin_left);
|
|
} else if (!is_auto(box.computed_values().inset().right)) {
|
|
float x_offset = 0
|
|
- box_state.inset_right
|
|
- box_state.border_box_right();
|
|
used_offset.set_x(containing_block_state.content_width + x_offset - box_state.content_width - box_state.margin_right);
|
|
} else {
|
|
float x_offset = box_state.margin_box_left();
|
|
used_offset.set_x(x_offset);
|
|
}
|
|
|
|
if (!is_auto(box.computed_values().inset().top)) {
|
|
float y_offset = box_state.inset_top
|
|
+ box_state.border_box_top();
|
|
used_offset.set_y(y_offset + box_state.margin_top);
|
|
} else if (!is_auto(box.computed_values().inset().bottom)) {
|
|
float y_offset = 0
|
|
- box_state.inset_bottom
|
|
- box_state.border_box_bottom();
|
|
used_offset.set_y(containing_block_state.content_height + y_offset - box_state.content_height - box_state.margin_bottom);
|
|
} else {
|
|
float y_offset = box_state.margin_box_top();
|
|
used_offset.set_y(y_offset);
|
|
}
|
|
|
|
box_state.offset = used_offset;
|
|
|
|
if (independent_formatting_context)
|
|
independent_formatting_context->parent_context_did_dimension_child_root_box();
|
|
}
|
|
|
|
void FormattingContext::compute_height_for_absolutely_positioned_replaced_element(ReplacedBox const& box)
|
|
{
|
|
// 10.6.5 Absolutely positioned, replaced elements
|
|
// The used value of 'height' is determined as for inline replaced elements.
|
|
m_state.get_mutable(box).content_height = compute_height_for_replaced_element(m_state, box);
|
|
}
|
|
|
|
// https://www.w3.org/TR/css-position-3/#relpos-insets
|
|
void FormattingContext::compute_inset(Box const& box)
|
|
{
|
|
if (box.computed_values().position() != CSS::Position::Relative)
|
|
return;
|
|
|
|
auto resolve_two_opposing_insets = [&](CSS::LengthPercentage const& computed_start, CSS::LengthPercentage const& computed_end, float& used_start, float& used_end, float reference_for_percentage) {
|
|
auto resolved_first = computed_start.resolved(box, CSS::Length::make_px(reference_for_percentage)).resolved(box);
|
|
auto resolved_second = computed_end.resolved(box, CSS::Length::make_px(reference_for_percentage)).resolved(box);
|
|
|
|
if (resolved_first.is_auto() && resolved_second.is_auto()) {
|
|
// If opposing inset properties in an axis both compute to auto (their initial values),
|
|
// their used values are zero (i.e., the boxes stay in their original position in that axis).
|
|
used_start = 0;
|
|
used_end = 0;
|
|
} else if (resolved_first.is_auto() || resolved_second.is_auto()) {
|
|
// If only one is auto, its used value becomes the negation of the other, and the box is shifted by the specified amount.
|
|
if (resolved_first.is_auto()) {
|
|
used_end = resolved_second.to_px(box);
|
|
used_start = 0 - used_end;
|
|
} else {
|
|
used_start = resolved_first.to_px(box);
|
|
used_end = 0 - used_start;
|
|
}
|
|
} else {
|
|
// If neither is auto, the position is over-constrained; (with respect to the writing mode of its containing block)
|
|
// the computed end side value is ignored, and its used value becomes the negation of the start side.
|
|
used_start = resolved_first.to_px(box);
|
|
used_end = 0 - used_start;
|
|
}
|
|
};
|
|
|
|
auto& box_state = m_state.get_mutable(box);
|
|
auto const& computed_values = box.computed_values();
|
|
auto const& containing_block_state = m_state.get(*box.containing_block());
|
|
|
|
// FIXME: Respect the containing block's writing-mode.
|
|
resolve_two_opposing_insets(computed_values.inset().left, computed_values.inset().right, box_state.inset_left, box_state.inset_right, containing_block_state.content_width);
|
|
resolve_two_opposing_insets(computed_values.inset().top, computed_values.inset().bottom, box_state.inset_top, box_state.inset_bottom, containing_block_state.content_height);
|
|
}
|
|
|
|
FormattingState::IntrinsicSizes FormattingContext::calculate_intrinsic_sizes(Layout::Box const& box) const
|
|
{
|
|
auto& root_state = m_state.m_root;
|
|
|
|
// If we have cached intrinsic sizes for this box, use them.
|
|
auto it = root_state.intrinsic_sizes.find(&box);
|
|
if (it != root_state.intrinsic_sizes.end())
|
|
return it->value;
|
|
|
|
// Nothing cached, perform two throwaway layouts to determine the intrinsic sizes.
|
|
// FIXME: This should handle replaced elements with "native" intrinsic size properly!
|
|
|
|
FormattingState::IntrinsicSizes cached_box_sizes;
|
|
auto const& containing_block = *box.containing_block();
|
|
{
|
|
FormattingState throwaway_state(&m_state);
|
|
auto& containing_block_state = throwaway_state.get_mutable(containing_block);
|
|
containing_block_state.content_width = INFINITY;
|
|
containing_block_state.content_height = INFINITY;
|
|
auto independent_formatting_context = const_cast<FormattingContext*>(this)->create_independent_formatting_context_if_needed(throwaway_state, box);
|
|
VERIFY(independent_formatting_context);
|
|
|
|
independent_formatting_context->run(box, LayoutMode::MaxContent);
|
|
cached_box_sizes.max_content_size.set_width(independent_formatting_context->greatest_child_width(box));
|
|
cached_box_sizes.max_content_size.set_height(BlockFormattingContext::compute_theoretical_height(throwaway_state, box));
|
|
}
|
|
|
|
{
|
|
FormattingState throwaway_state(&m_state);
|
|
auto& containing_block_state = throwaway_state.get_mutable(containing_block);
|
|
containing_block_state.content_width = 0;
|
|
containing_block_state.content_height = 0;
|
|
auto independent_formatting_context = const_cast<FormattingContext*>(this)->create_independent_formatting_context_if_needed(throwaway_state, box);
|
|
VERIFY(independent_formatting_context);
|
|
independent_formatting_context->run(box, LayoutMode::MinContent);
|
|
cached_box_sizes.min_content_size.set_width(independent_formatting_context->greatest_child_width(box));
|
|
cached_box_sizes.min_content_size.set_height(BlockFormattingContext::compute_theoretical_height(throwaway_state, box));
|
|
}
|
|
|
|
if (cached_box_sizes.min_content_size.width() > cached_box_sizes.max_content_size.width()) {
|
|
float tmp = cached_box_sizes.min_content_size.width();
|
|
cached_box_sizes.min_content_size.set_width(cached_box_sizes.max_content_size.width());
|
|
cached_box_sizes.max_content_size.set_width(tmp);
|
|
}
|
|
|
|
if (cached_box_sizes.min_content_size.height() > cached_box_sizes.max_content_size.height()) {
|
|
float tmp = cached_box_sizes.min_content_size.height();
|
|
cached_box_sizes.min_content_size.set_height(cached_box_sizes.max_content_size.height());
|
|
cached_box_sizes.max_content_size.set_height(tmp);
|
|
}
|
|
|
|
root_state.intrinsic_sizes.set(&box, cached_box_sizes);
|
|
return cached_box_sizes;
|
|
}
|
|
|
|
FormattingContext::MinAndMaxContentSize FormattingContext::calculate_min_and_max_content_width(Layout::Box const& box) const
|
|
{
|
|
auto const& sizes = calculate_intrinsic_sizes(box);
|
|
return { sizes.min_content_size.width(), sizes.max_content_size.width() };
|
|
}
|
|
|
|
FormattingContext::MinAndMaxContentSize FormattingContext::calculate_min_and_max_content_height(Layout::Box const& box) const
|
|
{
|
|
auto const& sizes = calculate_intrinsic_sizes(box);
|
|
return { sizes.min_content_size.height(), sizes.max_content_size.height() };
|
|
}
|
|
|
|
float FormattingContext::calculate_fit_content_size(float min_content_size, float max_content_size, Optional<float> available_space) const
|
|
{
|
|
// If the available space in a given axis is definite, equal to clamp(min-content size, stretch-fit size, max-content size)
|
|
// (i.e. max(min-content size, min(max-content size, stretch-fit size))).
|
|
if (available_space.has_value()) {
|
|
// FIXME: Compute the real stretch-fit size.
|
|
auto stretch_fit_size = *available_space;
|
|
auto s = max(min_content_size, min(max_content_size, stretch_fit_size));
|
|
return s;
|
|
}
|
|
|
|
// FIXME: When sizing under a min-content constraint, equal to the min-content size.
|
|
|
|
// Otherwise, equal to the max-content size in that axis.
|
|
return max_content_size;
|
|
}
|
|
|
|
float FormattingContext::calculate_fit_content_width(Layout::Box const& box, Optional<float> available_space) const
|
|
{
|
|
auto [min_content_size, max_content_size] = calculate_min_and_max_content_width(box);
|
|
return calculate_fit_content_size(min_content_size, max_content_size, available_space);
|
|
}
|
|
|
|
float FormattingContext::calculate_fit_content_height(Layout::Box const& box, Optional<float> available_space) const
|
|
{
|
|
auto [min_content_size, max_content_size] = calculate_min_and_max_content_height(box);
|
|
return calculate_fit_content_size(min_content_size, max_content_size, available_space);
|
|
}
|
|
}
|