121 lines
4.2 KiB
C++
121 lines
4.2 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/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/FormattingContext.h>
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#include <LibWeb/Layout/InlineFormattingContext.h>
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#include <LibWeb/Layout/TableFormattingContext.h>
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namespace Web::Layout {
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FormattingContext::FormattingContext(Box& context_box, FormattingContext* parent)
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: m_parent(parent)
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, m_context_box(&context_box)
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{
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}
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FormattingContext::~FormattingContext()
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{
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}
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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 (box.is_table_cell())
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return true;
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// FIXME: table-caption
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// FIXME: anonymous table cells
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// FIXME: Block elements where overflow has a value other than visible and clip.
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// FIXME: display: flow-root
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// FIXME: Elements with contain: layout, content, or paint.
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// FIXME: flex
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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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void FormattingContext::layout_inside(Box& box, LayoutMode layout_mode)
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{
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if (creates_block_formatting_context(box)) {
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BlockFormattingContext context(box, this);
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context.run(box, layout_mode);
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return;
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}
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if (box.is_table()) {
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TableFormattingContext context(box, this);
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context.run(box, layout_mode);
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} else if (box.children_are_inline()) {
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InlineFormattingContext context(box, this);
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context.run(box, layout_mode);
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} else {
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// FIXME: This needs refactoring!
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ASSERT(is_block_formatting_context());
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run(box, layout_mode);
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}
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}
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static float greatest_child_width(const Box& 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& child : box.line_boxes()) {
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max_width = max(max_width, child.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, 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& box)
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{
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// Calculate the preferred width by formatting the content without breaking lines
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// other than where explicit line breaks occur.
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layout_inside(box, LayoutMode::OnlyRequiredLineBreaks);
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float preferred_width = greatest_child_width(box);
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// Also calculate the preferred minimum width, e.g., by trying all possible line breaks.
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// CSS 2.2 does not define the exact algorithm.
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layout_inside(box, LayoutMode::AllPossibleLineBreaks);
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float preferred_minimum_width = greatest_child_width(box);
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return { preferred_width, preferred_minimum_width };
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}
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}
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