7cc6d1da2d
When we decide that a box has definite width or height based on its containing block's corresponding size, we'll want to resolve the current box's size as well. Otherwise anyone querying the size on this box will get the bogus message of "yes, this definite, and its value is zero."
190 lines
8.4 KiB
C++
190 lines
8.4 KiB
C++
/*
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* Copyright (c) 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/Layout/BlockContainer.h>
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#include <LibWeb/Layout/LayoutState.h>
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#include <LibWeb/Layout/TextNode.h>
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namespace Web::Layout {
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LayoutState::UsedValues& LayoutState::get_mutable(NodeWithStyleAndBoxModelMetrics const& box)
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{
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auto serial_id = box.serial_id();
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if (used_values_per_layout_node[serial_id])
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return *used_values_per_layout_node[serial_id];
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for (auto const* ancestor = m_parent; ancestor; ancestor = ancestor->m_parent) {
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if (ancestor->used_values_per_layout_node[serial_id]) {
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auto cow_used_values = adopt_own(*new UsedValues(*ancestor->used_values_per_layout_node[serial_id]));
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auto* cow_used_values_ptr = cow_used_values.ptr();
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used_values_per_layout_node[serial_id] = move(cow_used_values);
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return *cow_used_values_ptr;
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}
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}
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auto const* containing_block_used_values = box.is_initial_containing_block_box() ? nullptr : &get(*box.containing_block());
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used_values_per_layout_node[serial_id] = adopt_own(*new UsedValues);
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used_values_per_layout_node[serial_id]->set_node(const_cast<NodeWithStyleAndBoxModelMetrics&>(box), containing_block_used_values);
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return *used_values_per_layout_node[serial_id];
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}
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LayoutState::UsedValues const& LayoutState::get(NodeWithStyleAndBoxModelMetrics const& box) const
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{
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auto serial_id = box.serial_id();
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if (used_values_per_layout_node[serial_id])
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return *used_values_per_layout_node[serial_id];
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for (auto* ancestor = m_parent; ancestor; ancestor = ancestor->m_parent) {
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if (ancestor->used_values_per_layout_node[serial_id])
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return *ancestor->used_values_per_layout_node[serial_id];
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}
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auto const* containing_block_used_values = box.is_initial_containing_block_box() ? nullptr : &get(*box.containing_block());
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const_cast<LayoutState*>(this)->used_values_per_layout_node[serial_id] = adopt_own(*new UsedValues);
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const_cast<LayoutState*>(this)->used_values_per_layout_node[serial_id]->set_node(const_cast<NodeWithStyleAndBoxModelMetrics&>(box), containing_block_used_values);
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return *used_values_per_layout_node[serial_id];
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}
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void LayoutState::commit()
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{
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// Only the top-level LayoutState should ever be committed.
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VERIFY(!m_parent);
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HashTable<Layout::TextNode*> text_nodes;
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for (auto& used_values_ptr : used_values_per_layout_node) {
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if (!used_values_ptr)
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continue;
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auto& used_values = *used_values_ptr;
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auto& node = const_cast<NodeWithStyleAndBoxModelMetrics&>(used_values.node());
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// Transfer box model metrics.
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node.box_model().inset = { used_values.inset_top, used_values.inset_right, used_values.inset_bottom, used_values.inset_left };
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node.box_model().padding = { used_values.padding_top, used_values.padding_right, used_values.padding_bottom, used_values.padding_left };
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node.box_model().border = { used_values.border_top, used_values.border_right, used_values.border_bottom, used_values.border_left };
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node.box_model().margin = { used_values.margin_top, used_values.margin_right, used_values.margin_bottom, used_values.margin_left };
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node.set_paintable(node.create_paintable());
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// For boxes, transfer all the state needed for painting.
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if (is<Layout::Box>(node)) {
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auto& box = static_cast<Layout::Box const&>(node);
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auto& paint_box = const_cast<Painting::PaintableBox&>(*box.paint_box());
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paint_box.set_offset(used_values.offset);
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paint_box.set_content_size(used_values.content_width(), used_values.content_height());
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paint_box.set_overflow_data(move(used_values.overflow_data));
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paint_box.set_containing_line_box_fragment(used_values.containing_line_box_fragment);
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if (is<Layout::BlockContainer>(box)) {
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for (auto& line_box : used_values.line_boxes) {
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for (auto& fragment : line_box.fragments()) {
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if (fragment.layout_node().is_text_node())
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text_nodes.set(static_cast<Layout::TextNode*>(const_cast<Layout::Node*>(&fragment.layout_node())));
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}
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}
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static_cast<Painting::PaintableWithLines&>(paint_box).set_line_boxes(move(used_values.line_boxes));
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}
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}
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}
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for (auto* text_node : text_nodes)
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text_node->set_paintable(text_node->create_paintable());
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}
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Gfx::FloatRect margin_box_rect(Box const& box, LayoutState const& state)
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{
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auto const& box_state = state.get(box);
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auto rect = Gfx::FloatRect { box_state.offset, { box_state.content_width(), box_state.content_height() } };
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rect.set_x(rect.x() - box_state.margin_box_left());
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rect.set_width(rect.width() + box_state.margin_box_left() + box_state.margin_box_right());
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rect.set_y(rect.y() - box_state.margin_box_top());
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rect.set_height(rect.height() + box_state.margin_box_top() + box_state.margin_box_bottom());
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return rect;
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}
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Gfx::FloatRect margin_box_rect_in_ancestor_coordinate_space(Box const& box, Box const& ancestor_box, LayoutState const& state)
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{
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auto rect = margin_box_rect(box, state);
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for (auto const* current = box.parent(); current; current = current->parent()) {
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if (current == &ancestor_box)
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break;
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if (is<Box>(*current)) {
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auto const& current_state = state.get(static_cast<Box const&>(*current));
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rect.translate_by(current_state.offset);
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}
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}
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return rect;
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}
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Gfx::FloatRect absolute_content_rect(Box const& box, LayoutState const& state)
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{
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auto const& box_state = state.get(box);
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Gfx::FloatRect rect { box_state.offset, { box_state.content_width(), box_state.content_height() } };
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for (auto* block = box.containing_block(); block; block = block->containing_block())
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rect.translate_by(state.get(*block).offset);
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return rect;
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}
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void LayoutState::UsedValues::set_node(NodeWithStyleAndBoxModelMetrics& node, UsedValues const* containing_block_used_values)
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{
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m_node = &node;
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auto const& computed_values = node.computed_values();
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auto is_definite_size = [&](CSS::LengthPercentage const& size, float& resolved_definite_size, bool width) {
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// A size that can be determined without performing layout; that is,
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// a <length>,
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// a measure of text (without consideration of line-wrapping),
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// a size of the initial containing block,
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// or a <percentage> or other formula (such as the “stretch-fit” sizing of non-replaced blocks [CSS2]) that is resolved solely against definite sizes.
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auto containing_block_has_definite_size = containing_block_used_values ? (width ? containing_block_used_values->has_definite_width() : containing_block_used_values->has_definite_height()) : false;
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if (size.is_auto()) {
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// NOTE: The width of a non-flex-item block is considered definite if it's auto and the containing block has definite width.
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if (width && node.parent() && !node.parent()->computed_values().display().is_flex_inside()) {
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if (containing_block_has_definite_size) {
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resolved_definite_size = width ? containing_block_used_values->content_width() : containing_block_used_values->content_height();
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return true;
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}
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return false;
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}
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return false;
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}
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if (size.is_length()) {
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resolved_definite_size = size.length().to_px(node);
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return true;
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}
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if (size.is_percentage()) {
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if (containing_block_has_definite_size) {
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auto containing_block_size = width ? containing_block_used_values->content_width() : containing_block_used_values->content_height();
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resolved_definite_size = containing_block_size * size.percentage().as_fraction();
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return true;
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}
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return false;
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}
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// FIXME: Determine if calc() value is definite.
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return false;
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};
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m_has_definite_width = is_definite_size(computed_values.width(), m_content_width, true);
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m_has_definite_height = is_definite_size(computed_values.height(), m_content_height, false);
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}
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void LayoutState::UsedValues::set_content_width(float width)
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{
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m_content_width = width;
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}
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void LayoutState::UsedValues::set_content_height(float height)
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{
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m_content_height = height;
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}
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}
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