198 lines
8 KiB
C++
198 lines
8 KiB
C++
/*
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* Copyright (c) 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 <LibWeb/CSS/Length.h>
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#include <LibWeb/DOM/Node.h>
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#include <LibWeb/Dump.h>
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#include <LibWeb/Layout/BlockBox.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/InlineFormattingContext.h>
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#include <LibWeb/Layout/InlineNode.h>
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#include <LibWeb/Layout/ReplacedBox.h>
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namespace Web::Layout {
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InlineFormattingContext::InlineFormattingContext(Box& containing_block, FormattingContext* parent)
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: FormattingContext(containing_block, parent)
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{
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}
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InlineFormattingContext::~InlineFormattingContext()
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{
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}
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void InlineFormattingContext::run(LayoutMode layout_mode)
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{
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auto& containing_block = downcast<BlockBox>(context_box());
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ASSERT(containing_block.children_are_inline());
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containing_block.line_boxes().clear();
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containing_block.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(containing_block, layout_mode);
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});
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for (auto& line_box : containing_block.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 (!containing_block.line_boxes().is_empty() && containing_block.line_boxes().last().fragments().is_empty())
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containing_block.line_boxes().take_last();
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auto text_align = containing_block.style().text_align();
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float min_line_height = containing_block.specified_style().line_height(containing_block);
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float line_spacing = min_line_height - containing_block.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 : containing_block.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)containing_block.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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&& fragment.is_justifiable_whitespace()
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&& 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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if (fragment.layout_node().is_box())
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dimension_box_on_line(const_cast<Box&>(downcast<Box>(fragment.layout_node())), layout_mode);
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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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containing_block.set_width(max_linebox_width);
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}
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containing_block.set_height(content_height);
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}
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void InlineFormattingContext::dimension_box_on_line(Box& box, LayoutMode layout_mode)
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{
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auto& containing_block = downcast<BlockBox>(context_box());
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if (box.is_replaced()) {
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auto& replaced = const_cast<ReplacedBox&>(downcast<ReplacedBox>(box));
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replaced.set_width(replaced.calculate_width());
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replaced.set_height(replaced.calculate_height());
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return;
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}
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if (box.is_inline_block()) {
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auto& inline_block = const_cast<BlockBox&>(downcast<BlockBox>(box));
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if (inline_block.style().width().is_undefined_or_auto()) {
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auto result = calculate_shrink_to_fit_widths(inline_block);
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// FIXME: (10.3.5) 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
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// relevant scroll bars.
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auto available_width = containing_block.width();
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auto width = min(max(result.preferred_minimum_width, available_width), result.preferred_width);
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inline_block.set_width(width);
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} else {
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inline_block.set_width(inline_block.style().width().to_px(inline_block));
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}
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layout_inside(inline_block, layout_mode);
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if (inline_block.style().height().is_undefined_or_auto()) {
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// FIXME: (10.6.6) If 'height' is 'auto', the height depends on the element's descendants per 10.6.7.
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} else {
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inline_block.set_height(inline_block.style().height().to_px(inline_block));
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}
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return;
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}
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// Non-replaced, non-inline-block, box on a line!?
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// I don't think we should be here. Dump the box tree so we can take a look at it.
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dbgln("FIXME: I've been asked to dimension a non-replaced, non-inline-block box on a line:");
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dump_tree(box);
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}
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}
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