781 lines
34 KiB
C++
781 lines
34 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <LibGUI/Painter.h>
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#include <LibWeb/CSS/StyleResolver.h>
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#include <LibWeb/DOM/Element.h>
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#include <LibWeb/Dump.h>
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#include <LibWeb/Layout/LayoutBlock.h>
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#include <LibWeb/Layout/LayoutDocument.h>
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#include <LibWeb/Layout/LayoutInline.h>
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#include <LibWeb/Layout/LayoutReplaced.h>
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#include <LibWeb/Layout/LayoutText.h>
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#include <LibWeb/Layout/LayoutWidget.h>
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#include <math.h>
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namespace Web {
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LayoutBlock::LayoutBlock(DOM::Document& document, const DOM::Node* node, NonnullRefPtr<CSS::StyleProperties> style)
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: LayoutBox(document, node, move(style))
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{
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}
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LayoutBlock::~LayoutBlock()
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{
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}
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LayoutNode& LayoutBlock::inline_wrapper()
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{
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if (!last_child() || !last_child()->is_block() || last_child()->node() != nullptr) {
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append_child(adopt(*new LayoutBlock(document(), nullptr, style_for_anonymous_block())));
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last_child()->set_children_are_inline(true);
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}
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return *last_child();
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}
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void LayoutBlock::layout(LayoutMode layout_mode)
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{
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compute_width();
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layout_inside(layout_mode);
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compute_height();
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layout_absolutely_positioned_descendants();
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}
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void LayoutBlock::layout_absolutely_positioned_descendant(LayoutBox& box)
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{
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box.layout(LayoutMode::Default);
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auto& box_model = box.box_model();
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auto zero_value = CSS::Length::make_px(0);
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auto specified_width = box.style().width().resolved_or_auto(box, width());
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box_model.margin.left = box.style().margin().left.resolved_or_auto(box, width());
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box_model.margin.top = box.style().margin().top.resolved_or_auto(box, height());
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box_model.margin.right = box.style().margin().right.resolved_or_auto(box, width());
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box_model.margin.bottom = box.style().margin().bottom.resolved_or_auto(box, height());
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box_model.border.left = CSS::Length::make_px(box.style().border_left().width);
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box_model.border.right = CSS::Length::make_px(box.style().border_right().width);
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box_model.border.top = CSS::Length::make_px(box.style().border_top().width);
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box_model.border.bottom = CSS::Length::make_px(box.style().border_bottom().width);
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box_model.offset.left = box.style().offset().left.resolved_or_auto(box, width());
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box_model.offset.top = box.style().offset().top.resolved_or_auto(box, height());
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box_model.offset.right = box.style().offset().right.resolved_or_auto(box, width());
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box_model.offset.bottom = box.style().offset().bottom.resolved_or_auto(box, height());
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if (box_model.offset.left.is_auto() && specified_width.is_auto() && box_model.offset.right.is_auto()) {
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if (box_model.margin.left.is_auto())
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box_model.margin.left = zero_value;
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if (box_model.margin.right.is_auto())
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box_model.margin.right = zero_value;
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}
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Gfx::FloatPoint used_offset;
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if (!box_model.offset.left.is_auto()) {
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float x_offset = box_model.offset.left.to_px(box)
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+ box_model.border_box(box).left;
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used_offset.set_x(x_offset + box_model.margin.left.to_px(box));
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} else if (!box_model.offset.right.is_auto()) {
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float x_offset = 0
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- box_model.offset.right.to_px(box)
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- box_model.border_box(box).right;
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used_offset.set_x(width() + x_offset - box.width() - box_model.margin.right.to_px(box));
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} else {
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float x_offset = box_model.margin_box(box).left;
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used_offset.set_x(x_offset);
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}
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if (!box_model.offset.top.is_auto()) {
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float y_offset = box_model.offset.top.to_px(box)
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+ box_model.border_box(box).top;
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used_offset.set_y(y_offset + box_model.margin.top.to_px(box));
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} else if (!box_model.offset.bottom.is_auto()) {
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float y_offset = 0
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- box_model.offset.bottom.to_px(box)
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- box_model.border_box(box).bottom;
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used_offset.set_y(height() + y_offset - box.height() - box_model.margin.bottom.to_px(box));
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} else {
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float y_offset = box_model.margin_box(box).top;
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used_offset.set_y(y_offset);
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}
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box.set_offset(used_offset);
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}
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void LayoutBlock::layout_inside(LayoutMode layout_mode)
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{
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if (children_are_inline())
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layout_inline_children(layout_mode);
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else
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layout_contained_boxes(layout_mode);
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}
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void LayoutBlock::layout_absolutely_positioned_descendants()
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{
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for_each_in_subtree_of_type<LayoutBox>([&](auto& box) {
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if (box.is_absolutely_positioned() && box.containing_block() == this) {
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layout_absolutely_positioned_descendant(box);
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}
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return IterationDecision::Continue;
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});
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}
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void LayoutBlock::layout_contained_boxes(LayoutMode layout_mode)
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{
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float content_height = 0;
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float content_width = 0;
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for_each_in_subtree_of_type<LayoutBox>([&](auto& box) {
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if (box.is_absolutely_positioned() || box.containing_block() != this)
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return IterationDecision::Continue;
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box.layout(layout_mode);
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if (box.is_replaced())
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place_block_level_replaced_element_in_normal_flow(downcast<LayoutReplaced>(box));
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else if (box.is_block())
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place_block_level_non_replaced_element_in_normal_flow(downcast<LayoutBlock>(box));
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else
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dbg() << "FIXME: LayoutBlock::layout_contained_boxes doesn't know how to place a " << box.class_name();
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content_height = max(content_height, box.effective_offset().y() + box.height() + box.box_model().margin_box(*this).bottom);
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content_width = max(content_width, downcast<LayoutBox>(box).width());
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return IterationDecision::Continue;
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});
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if (layout_mode != LayoutMode::Default) {
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if (style().width().is_undefined() || style().width().is_auto())
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set_width(content_width);
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}
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set_height(content_height);
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}
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void LayoutBlock::layout_inline_children(LayoutMode layout_mode)
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{
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ASSERT(children_are_inline());
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m_line_boxes.clear();
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for_each_child([&](auto& child) {
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ASSERT(child.is_inline());
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if (child.is_absolutely_positioned())
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return;
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child.split_into_lines(*this, layout_mode);
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});
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for (auto& line_box : m_line_boxes) {
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line_box.trim_trailing_whitespace();
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}
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// If there's an empty line box at the bottom, just remove it instead of giving it height.
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if (!m_line_boxes.is_empty() && m_line_boxes.last().fragments().is_empty())
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m_line_boxes.take_last();
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auto text_align = style().text_align();
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float min_line_height = specified_style().line_height(*this);
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float line_spacing = min_line_height - specified_style().font().glyph_height();
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float content_height = 0;
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float max_linebox_width = 0;
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for (auto& line_box : m_line_boxes) {
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float max_height = min_line_height;
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for (auto& fragment : line_box.fragments()) {
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max_height = max(max_height, fragment.height());
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}
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float x_offset = 0;
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float excess_horizontal_space = (float)width() - line_box.width();
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switch (text_align) {
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case CSS::TextAlign::Center:
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case CSS::TextAlign::VendorSpecificCenter:
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x_offset += excess_horizontal_space / 2;
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break;
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case CSS::TextAlign::Right:
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x_offset += excess_horizontal_space;
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break;
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case CSS::TextAlign::Left:
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case CSS::TextAlign::Justify:
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default:
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break;
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}
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float excess_horizontal_space_including_whitespace = excess_horizontal_space;
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int whitespace_count = 0;
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if (text_align == CSS::TextAlign::Justify) {
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for (auto& fragment : line_box.fragments()) {
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if (fragment.is_justifiable_whitespace()) {
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++whitespace_count;
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excess_horizontal_space_including_whitespace += fragment.width();
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}
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}
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}
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float justified_space_width = whitespace_count ? (excess_horizontal_space_including_whitespace / (float)whitespace_count) : 0;
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for (size_t i = 0; i < line_box.fragments().size(); ++i) {
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auto& fragment = line_box.fragments()[i];
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// Vertically align everyone's bottom to the line.
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// FIXME: Support other kinds of vertical alignment.
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fragment.set_offset({ roundf(x_offset + fragment.offset().x()), content_height + (max_height - fragment.height()) - (line_spacing / 2) });
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if (text_align == CSS::TextAlign::Justify) {
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if (fragment.is_justifiable_whitespace()) {
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if (fragment.width() != justified_space_width) {
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float diff = justified_space_width - fragment.width();
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fragment.set_width(justified_space_width);
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// Shift subsequent sibling fragments to the right to adjust for change in width.
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for (size_t j = i + 1; j < line_box.fragments().size(); ++j) {
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auto offset = line_box.fragments()[j].offset();
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offset.move_by(diff, 0);
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line_box.fragments()[j].set_offset(offset);
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}
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}
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}
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}
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if (fragment.layout_node().is_inline_block()) {
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auto& inline_block = const_cast<LayoutBlock&>(downcast<LayoutBlock>(fragment.layout_node()));
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inline_block.set_size(fragment.size());
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inline_block.layout(layout_mode);
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}
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float final_line_box_width = 0;
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for (auto& fragment : line_box.fragments())
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final_line_box_width += fragment.width();
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line_box.m_width = final_line_box_width;
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max_linebox_width = max(max_linebox_width, final_line_box_width);
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}
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content_height += max_height;
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}
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if (layout_mode != LayoutMode::Default) {
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set_width(max_linebox_width);
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}
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set_height(content_height);
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}
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void LayoutBlock::compute_width_for_absolutely_positioned_block()
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{
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auto& containing_block = *this->containing_block();
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auto zero_value = CSS::Length::make_px(0);
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auto margin_left = CSS::Length::make_auto();
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auto margin_right = CSS::Length::make_auto();
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const auto border_left = style().border_left().width;
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const auto border_right = style().border_right().width;
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const auto padding_left = style().padding().left.resolved(zero_value, *this, containing_block.width());
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const auto padding_right = style().padding().right.resolved(zero_value, *this, containing_block.width());
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auto try_compute_width = [&](const auto& a_width) {
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margin_left = style().margin().left.resolved(zero_value, *this, containing_block.width());
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margin_right = style().margin().right.resolved(zero_value, *this, containing_block.width());
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auto left = style().offset().left.resolved_or_auto(*this, containing_block.width());
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auto right = style().offset().right.resolved_or_auto(*this, containing_block.width());
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auto width = a_width;
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auto solve_for_left = [&] {
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return CSS::Length(containing_block.width() - margin_left.to_px(*this) - border_left - padding_left.to_px(*this) - width.to_px(*this) - padding_right.to_px(*this) - border_right - margin_right.to_px(*this) - right.to_px(*this), CSS::Length::Type::Px);
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};
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auto solve_for_width = [&] {
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return CSS::Length(containing_block.width() - left.to_px(*this) - margin_left.to_px(*this) - border_left - padding_left.to_px(*this) - padding_right.to_px(*this) - border_right - margin_right.to_px(*this) - right.to_px(*this), CSS::Length::Type::Px);
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};
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auto solve_for_right = [&] {
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return CSS::Length(containing_block.width() - left.to_px(*this) - margin_left.to_px(*this) - border_left - padding_left.to_px(*this) - width.to_px(*this) - padding_right.to_px(*this) - border_right - margin_right.to_px(*this), CSS::Length::Type::Px);
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};
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// If all three of 'left', 'width', and 'right' are 'auto':
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if (left.is_auto() && width.is_auto() && right.is_auto()) {
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// First set any 'auto' values for 'margin-left' and 'margin-right' to 0.
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if (margin_left.is_auto())
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margin_left = CSS::Length::make_px(0);
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if (margin_right.is_auto())
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margin_right = CSS::Length::make_px(0);
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// Then, if the 'direction' property of the element establishing the static-position containing block
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// is 'ltr' set 'left' to the static position and apply rule number three below;
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// otherwise, set 'right' to the static position and apply rule number one below.
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// FIXME: This is very hackish.
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left = CSS::Length::make_px(0);
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goto Rule3;
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}
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if (!left.is_auto() && !width.is_auto() && !right.is_auto()) {
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// FIXME: This should be solved in a more complicated way.
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return width;
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}
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if (margin_left.is_auto())
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margin_left = CSS::Length::make_px(0);
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if (margin_right.is_auto())
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margin_right = CSS::Length::make_px(0);
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// 1. 'left' and 'width' are 'auto' and 'right' is not 'auto',
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// then the width is shrink-to-fit. Then solve for 'left'
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if (left.is_auto() && width.is_auto() && !right.is_auto()) {
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auto result = calculate_shrink_to_fit_width();
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solve_for_left();
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auto available_width = solve_for_width();
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width = CSS::Length(min(max(result.preferred_minimum_width, available_width.to_px(*this)), result.preferred_width), CSS::Length::Type::Px);
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}
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// 2. 'left' and 'right' are 'auto' and 'width' is not 'auto',
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// then if the 'direction' property of the element establishing
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// the static-position containing block is 'ltr' set 'left'
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// to the static position, otherwise set 'right' to the static position.
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// Then solve for 'left' (if 'direction is 'rtl') or 'right' (if 'direction' is 'ltr').
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else if (left.is_auto() && right.is_auto() && !width.is_auto()) {
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// FIXME: Check direction
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// FIXME: Use the static-position containing block
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left = zero_value;
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right = solve_for_right();
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}
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// 3. 'width' and 'right' are 'auto' and 'left' is not 'auto',
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// then the width is shrink-to-fit. Then solve for 'right'
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else if (width.is_auto() && right.is_auto() && !left.is_auto()) {
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Rule3:
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auto result = calculate_shrink_to_fit_width();
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right = solve_for_right();
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auto available_width = solve_for_width();
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width = CSS::Length(min(max(result.preferred_minimum_width, available_width.to_px(*this)), result.preferred_width), CSS::Length::Type::Px);
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}
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// 4. 'left' is 'auto', 'width' and 'right' are not 'auto', then solve for 'left'
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else if (left.is_auto() && !width.is_auto() && !right.is_auto()) {
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left = solve_for_left();
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}
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// 5. 'width' is 'auto', 'left' and 'right' are not 'auto', then solve for 'width'
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else if (width.is_auto() && !left.is_auto() && !right.is_auto()) {
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width = solve_for_width();
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}
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// 6. 'right' is 'auto', 'left' and 'width' are not 'auto', then solve for 'right'
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else if (right.is_auto() && !left.is_auto() && !width.is_auto()) {
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right = solve_for_right();
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}
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return width;
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};
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auto specified_width = style().width().resolved_or_auto(*this, containing_block.width());
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// 1. The tentative used width is calculated (without 'min-width' and 'max-width')
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auto used_width = try_compute_width(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 = style().max_width().resolved_or_auto(*this, containing_block.width());
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if (!specified_max_width.is_auto()) {
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if (used_width.to_px(*this) > specified_max_width.to_px(*this)) {
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used_width = try_compute_width(specified_max_width);
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}
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}
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// 3. If the resulting width is smaller than 'min-width', the rules above are applied again,
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// but this time using the value of 'min-width' as the computed value for 'width'.
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auto specified_min_width = style().min_width().resolved_or_auto(*this, containing_block.width());
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if (!specified_min_width.is_auto()) {
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if (used_width.to_px(*this) < specified_min_width.to_px(*this)) {
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used_width = try_compute_width(specified_min_width);
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}
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}
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set_width(used_width.to_px(*this));
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box_model().margin.left = margin_left;
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box_model().margin.right = margin_right;
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box_model().border.left = CSS::Length::make_px(border_left);
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box_model().border.right = CSS::Length::make_px(border_right);
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box_model().padding.left = padding_left;
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box_model().padding.right = padding_right;
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}
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float LayoutBlock::width_of_logical_containing_block() const
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{
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auto* containing_block = this->containing_block();
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ASSERT(containing_block);
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return containing_block->width();
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}
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void LayoutBlock::compute_width()
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{
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if (is_absolutely_positioned())
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return compute_width_for_absolutely_positioned_block();
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float width_of_containing_block = this->width_of_logical_containing_block();
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auto zero_value = CSS::Length::make_px(0);
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auto margin_left = CSS::Length::make_auto();
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auto margin_right = CSS::Length::make_auto();
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const auto padding_left = style().padding().left.resolved_or_zero(*this, width_of_containing_block);
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const auto padding_right = style().padding().right.resolved_or_zero(*this, width_of_containing_block);
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auto try_compute_width = [&](const auto& a_width) {
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CSS::Length width = a_width;
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margin_left = style().margin().left.resolved_or_zero(*this, width_of_containing_block);
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margin_right = style().margin().right.resolved_or_zero(*this, width_of_containing_block);
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float total_px = style().border_left().width + style().border_right().width;
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for (auto& value : { margin_left, padding_left, width, padding_right, margin_right }) {
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total_px += value.to_px(*this);
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}
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#ifdef HTML_DEBUG
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dbg() << "Total: " << total_px;
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#endif
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if (!is_replaced() && !is_inline()) {
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// 10.3.3 Block-level, non-replaced elements in normal flow
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// If 'width' is not 'auto' and 'border-left-width' + 'padding-left' + 'width' + 'padding-right' + 'border-right-width' (plus any of 'margin-left' or 'margin-right' that are not 'auto') is larger than the width of the containing block, then any 'auto' values for 'margin-left' or 'margin-right' are, for the following rules, treated as zero.
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if (width.is_auto() && total_px > width_of_containing_block) {
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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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}
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// 10.3.3 cont'd.
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auto underflow_px = width_of_containing_block - total_px;
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if (width.is_auto()) {
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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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if (underflow_px >= 0) {
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width = CSS::Length(underflow_px, CSS::Length::Type::Px);
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} else {
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width = zero_value;
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margin_right = CSS::Length(margin_right.to_px(*this) + underflow_px, CSS::Length::Type::Px);
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}
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} else {
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if (!margin_left.is_auto() && !margin_right.is_auto()) {
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margin_right = CSS::Length(margin_right.to_px(*this) + underflow_px, CSS::Length::Type::Px);
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} else if (!margin_left.is_auto() && margin_right.is_auto()) {
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margin_right = CSS::Length(underflow_px, CSS::Length::Type::Px);
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} else if (margin_left.is_auto() && !margin_right.is_auto()) {
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margin_left = CSS::Length(underflow_px, CSS::Length::Type::Px);
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} else { // margin_left.is_auto() && margin_right.is_auto()
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auto half_of_the_underflow = CSS::Length(underflow_px / 2, CSS::Length::Type::Px);
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margin_left = half_of_the_underflow;
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margin_right = half_of_the_underflow;
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}
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}
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} else if (!is_replaced() && is_inline_block()) {
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// 10.3.9 'Inline-block', non-replaced elements in normal flow
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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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// If 'width' is 'auto', the used value is the shrink-to-fit width as for floating elements.
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if (width.is_auto()) {
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// Find the available width: in this case, this is the width of the containing
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// block minus the used values of 'margin-left', 'border-left-width', 'padding-left',
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// 'padding-right', 'border-right-width', 'margin-right', and the widths of any relevant scroll bars.
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float available_width = width_of_containing_block
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- margin_left.to_px(*this) - style().border_left().width - padding_left.to_px(*this)
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- padding_right.to_px(*this) - style().border_right().width - margin_right.to_px(*this);
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auto result = calculate_shrink_to_fit_width();
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// Then the shrink-to-fit width is: min(max(preferred minimum width, available width), preferred width).
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width = CSS::Length(min(max(result.preferred_minimum_width, available_width), result.preferred_width), CSS::Length::Type::Px);
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}
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}
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return width;
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};
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auto specified_width = style().width().resolved_or_auto(*this, width_of_containing_block);
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// 1. The tentative used width is calculated (without 'min-width' and 'max-width')
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auto used_width = try_compute_width(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 = style().max_width().resolved_or_auto(*this, width_of_containing_block);
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if (!specified_max_width.is_auto()) {
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if (used_width.to_px(*this) > specified_max_width.to_px(*this)) {
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used_width = try_compute_width(specified_max_width);
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}
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}
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// 3. If the resulting width is smaller than 'min-width', the rules above are applied again,
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// but this time using the value of 'min-width' as the computed value for 'width'.
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auto specified_min_width = style().min_width().resolved_or_auto(*this, width_of_containing_block);
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if (!specified_min_width.is_auto()) {
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if (used_width.to_px(*this) < specified_min_width.to_px(*this)) {
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used_width = try_compute_width(specified_min_width);
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}
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}
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set_width(used_width.to_px(*this));
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box_model().margin.left = margin_left;
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box_model().margin.right = margin_right;
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box_model().border.left = CSS::Length::make_px(style().border_left().width);
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box_model().border.right = CSS::Length::make_px(style().border_right().width);
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box_model().padding.left = padding_left;
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box_model().padding.right = padding_right;
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}
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void LayoutBlock::place_block_level_replaced_element_in_normal_flow(LayoutReplaced& box)
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{
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ASSERT(!is_absolutely_positioned());
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auto& containing_block = *this;
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auto& replaced_element_box_model = box.box_model();
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replaced_element_box_model.margin.top = box.style().margin().top.resolved_or_zero(*this, containing_block.width());
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replaced_element_box_model.margin.bottom = box.style().margin().bottom.resolved_or_zero(*this, containing_block.width());
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replaced_element_box_model.border.top = CSS::Length::make_px(box.style().border_top().width);
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replaced_element_box_model.border.bottom = CSS::Length::make_px(box.style().border_bottom().width);
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replaced_element_box_model.padding.top = box.style().padding().top.resolved_or_zero(*this, containing_block.width());
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replaced_element_box_model.padding.bottom = box.style().padding().bottom.resolved_or_zero(*this, containing_block.width());
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float x = replaced_element_box_model.margin.left.to_px(*this)
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+ replaced_element_box_model.border.left.to_px(*this)
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+ replaced_element_box_model.padding.left.to_px(*this)
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+ replaced_element_box_model.offset.left.to_px(*this);
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float y = replaced_element_box_model.margin_box(*this).top + box_model().offset.top.to_px(*this);
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box.set_offset(x, y);
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}
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LayoutBlock::ShrinkToFitResult LayoutBlock::calculate_shrink_to_fit_width()
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|
{
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auto greatest_child_width = [&] {
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float max_width = 0;
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if (children_are_inline()) {
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|
for (auto& box : line_boxes()) {
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|
max_width = max(max_width, box.width());
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}
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} else {
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for_each_child([&](auto& child) {
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|
if (child.is_box())
|
|
max_width = max(max_width, downcast<LayoutBox>(child).width());
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|
});
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|
}
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|
return max_width;
|
|
};
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|
// Calculate the preferred width by formatting the content without breaking lines
|
|
// other than where explicit line breaks occur.
|
|
layout_inside(LayoutMode::OnlyRequiredLineBreaks);
|
|
float preferred_width = greatest_child_width();
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|
|
|
// Also calculate the preferred minimum width, e.g., by trying all possible line breaks.
|
|
// CSS 2.2 does not define the exact algorithm.
|
|
|
|
layout_inside(LayoutMode::AllPossibleLineBreaks);
|
|
float preferred_minimum_width = greatest_child_width();
|
|
|
|
return { preferred_width, preferred_minimum_width };
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|
}
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|
|
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void LayoutBlock::place_block_level_non_replaced_element_in_normal_flow(LayoutBlock& block)
|
|
{
|
|
auto zero_value = CSS::Length::make_px(0);
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|
auto& containing_block = *this;
|
|
auto& box = block.box_model();
|
|
auto& style = block.style();
|
|
|
|
box.margin.top = style.margin().top.resolved(zero_value, *this, containing_block.width());
|
|
box.margin.bottom = style.margin().bottom.resolved(zero_value, *this, containing_block.width());
|
|
box.border.top = CSS::Length::make_px(style.border_top().width);
|
|
box.border.bottom = CSS::Length::make_px(style.border_bottom().width);
|
|
box.padding.top = style.padding().top.resolved(zero_value, *this, containing_block.width());
|
|
box.padding.bottom = style.padding().bottom.resolved(zero_value, *this, containing_block.width());
|
|
|
|
float x = box.margin.left.to_px(*this)
|
|
+ box.border.left.to_px(*this)
|
|
+ box.padding.left.to_px(*this)
|
|
+ box.offset.left.to_px(*this);
|
|
|
|
if (this->style().text_align() == CSS::TextAlign::VendorSpecificCenter) {
|
|
x = (containing_block.width() / 2) - block.width() / 2;
|
|
}
|
|
|
|
float y = box.margin_box(*this).top
|
|
+ box.offset.top.to_px(*this);
|
|
|
|
// NOTE: Empty (0-height) preceding siblings have their margins collapsed with *their* preceding sibling, etc.
|
|
float collapsed_bottom_margin_of_preceding_siblings = 0;
|
|
|
|
auto* relevant_sibling = block.previous_sibling();
|
|
while (relevant_sibling != nullptr) {
|
|
if (!relevant_sibling->is_absolutely_positioned() && !relevant_sibling->is_floating()) {
|
|
collapsed_bottom_margin_of_preceding_siblings = max(collapsed_bottom_margin_of_preceding_siblings, relevant_sibling->box_model().margin.bottom.to_px(*relevant_sibling));
|
|
if (relevant_sibling->height() > 0)
|
|
break;
|
|
}
|
|
relevant_sibling = relevant_sibling->previous_sibling();
|
|
}
|
|
|
|
if (relevant_sibling) {
|
|
y += relevant_sibling->effective_offset().y() + relevant_sibling->height();
|
|
|
|
// Collapse top margin with bottom margin of preceding siblings if needed
|
|
float my_margin_top = box.margin.top.to_px(*this);
|
|
|
|
if (my_margin_top < 0 || collapsed_bottom_margin_of_preceding_siblings < 0) {
|
|
// Negative margins present.
|
|
float largest_negative_margin = -min(my_margin_top, collapsed_bottom_margin_of_preceding_siblings);
|
|
float largest_positive_margin = (my_margin_top < 0 && collapsed_bottom_margin_of_preceding_siblings < 0) ? 0 : max(my_margin_top, collapsed_bottom_margin_of_preceding_siblings);
|
|
float final_margin = largest_positive_margin - largest_negative_margin;
|
|
y += final_margin - my_margin_top;
|
|
} else if (collapsed_bottom_margin_of_preceding_siblings > my_margin_top) {
|
|
// Sibling's margin is larger than mine, adjust so we use sibling's.
|
|
y += collapsed_bottom_margin_of_preceding_siblings - my_margin_top;
|
|
}
|
|
}
|
|
|
|
block.set_offset(x, y);
|
|
}
|
|
|
|
void LayoutBlock::compute_height()
|
|
{
|
|
auto& containing_block = *this->containing_block();
|
|
|
|
CSS::Length specified_height;
|
|
|
|
if (style().height().is_percentage() && !containing_block.style().height().is_absolute()) {
|
|
specified_height = CSS::Length::make_auto();
|
|
} else {
|
|
specified_height = style().height().resolved_or_auto(*this, containing_block.height());
|
|
}
|
|
|
|
auto specified_max_height = style().max_height().resolved_or_auto(*this, containing_block.height());
|
|
|
|
box_model().margin.top = style().margin().top.resolved_or_zero(*this, containing_block.width());
|
|
box_model().margin.bottom = style().margin().bottom.resolved_or_zero(*this, containing_block.width());
|
|
box_model().border.top = CSS::Length::make_px(style().border_top().width);
|
|
box_model().border.bottom = CSS::Length::make_px(style().border_bottom().width);
|
|
box_model().padding.top = style().padding().top.resolved_or_zero(*this, containing_block.width());
|
|
box_model().padding.bottom = style().padding().bottom.resolved_or_zero(*this, containing_block.width());
|
|
|
|
if (!specified_height.is_auto()) {
|
|
float used_height = specified_height.to_px(*this);
|
|
if (!specified_max_height.is_auto())
|
|
used_height = min(used_height, specified_max_height.to_px(*this));
|
|
set_height(used_height);
|
|
}
|
|
}
|
|
|
|
void LayoutBlock::paint(PaintContext& context, PaintPhase phase)
|
|
{
|
|
if (!is_visible())
|
|
return;
|
|
|
|
LayoutBox::paint(context, phase);
|
|
|
|
// FIXME: Inline backgrounds etc.
|
|
if (phase == PaintPhase::Foreground) {
|
|
if (children_are_inline()) {
|
|
for (auto& line_box : m_line_boxes) {
|
|
for (auto& fragment : line_box.fragments()) {
|
|
if (context.should_show_line_box_borders())
|
|
context.painter().draw_rect(enclosing_int_rect(fragment.absolute_rect()), Color::Green);
|
|
fragment.paint(context);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
HitTestResult LayoutBlock::hit_test(const Gfx::IntPoint& position) const
|
|
{
|
|
if (!children_are_inline())
|
|
return LayoutBox::hit_test(position);
|
|
|
|
HitTestResult last_good_candidate;
|
|
for (auto& line_box : m_line_boxes) {
|
|
for (auto& fragment : line_box.fragments()) {
|
|
if (is<LayoutBox>(fragment.layout_node()) && downcast<LayoutBox>(fragment.layout_node()).stacking_context())
|
|
continue;
|
|
if (enclosing_int_rect(fragment.absolute_rect()).contains(position)) {
|
|
if (fragment.layout_node().is_block())
|
|
return downcast<LayoutBlock>(fragment.layout_node()).hit_test(position);
|
|
return { fragment.layout_node(), fragment.text_index_at(position.x()) };
|
|
}
|
|
if (fragment.absolute_rect().top() <= position.y())
|
|
last_good_candidate = { fragment.layout_node(), fragment.text_index_at(position.x()) };
|
|
}
|
|
}
|
|
|
|
if (last_good_candidate.layout_node)
|
|
return last_good_candidate;
|
|
return { absolute_rect().contains(position.x(), position.y()) ? this : nullptr };
|
|
}
|
|
|
|
NonnullRefPtr<CSS::StyleProperties> LayoutBlock::style_for_anonymous_block() const
|
|
{
|
|
auto new_style = CSS::StyleProperties::create();
|
|
|
|
specified_style().for_each_property([&](auto property_id, auto& value) {
|
|
if (CSS::StyleResolver::is_inherited_property(property_id))
|
|
new_style->set_property(property_id, value);
|
|
});
|
|
|
|
return new_style;
|
|
}
|
|
|
|
LineBox& LayoutBlock::ensure_last_line_box()
|
|
{
|
|
if (m_line_boxes.is_empty())
|
|
m_line_boxes.append(LineBox());
|
|
return m_line_boxes.last();
|
|
}
|
|
|
|
LineBox& LayoutBlock::add_line_box()
|
|
{
|
|
m_line_boxes.append(LineBox());
|
|
return m_line_boxes.last();
|
|
}
|
|
|
|
void LayoutBlock::split_into_lines(LayoutBlock& container, LayoutMode layout_mode)
|
|
{
|
|
layout(layout_mode);
|
|
|
|
auto* line_box = &container.ensure_last_line_box();
|
|
if (layout_mode != LayoutMode::OnlyRequiredLineBreaks && line_box->width() > 0 && line_box->width() + width() > container.width()) {
|
|
line_box = &container.add_line_box();
|
|
}
|
|
line_box->add_fragment(*this, 0, 0, width(), height());
|
|
}
|
|
|
|
}
|