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LibWeb: Rename LayoutNode classes and move them into Layout namespace

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Bring the names of various boxes closer to spec language. This should
hopefully make things easier to understand and hack on. :^)

Some notable changes:

- LayoutNode -> Layout::Node
- LayoutBox -> Layout::Box
- LayoutBlock -> Layout::BlockBox
- LayoutReplaced -> Layout::ReplacedBox
- LayoutDocument -> Layout::InitialContainingBlockBox
- LayoutText -> Layout::TextNode
- LayoutInline -> Layout::InlineNode

Note that this is not strictly a "box tree" as we also hang inline/text
nodes in the same tree, and they don't generate boxes. (Instead, they
contribute line box fragments to their containing block!)
This commit is contained in:
Andreas Kling 2020-11-22 15:53:01 +01:00
parent f358f2255f
commit 5aeab9878e
114 changed files with 863 additions and 880 deletions
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134
Libraries/LibWeb/Layout/ReplacedBox.cpp Normal file
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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <LibWeb/DOM/Element.h>
#include <LibWeb/Layout/BlockBox.h>
#include <LibWeb/Layout/ReplacedBox.h>
namespace Web::Layout {
ReplacedBox::ReplacedBox(DOM::Document& document, DOM::Element& element, NonnullRefPtr<CSS::StyleProperties> style)
: Box(document, &element, move(style))
{
// FIXME: Allow non-inline replaced elements.
set_inline(true);
}
ReplacedBox::~ReplacedBox()
{
}
float ReplacedBox::calculate_width() const
{
// 10.3.2 [Inline,] replaced elements
auto zero_value = CSS::Length::make_px(0);
auto& containing_block = *this->containing_block();
auto margin_left = style().margin().left.resolved_or_zero(*this, containing_block.width());
auto margin_right = style().margin().right.resolved_or_zero(*this, containing_block.width());
// A computed value of 'auto' for 'margin-left' or 'margin-right' becomes a used value of '0'.
if (margin_left.is_auto())
margin_left = zero_value;
if (margin_right.is_auto())
margin_right = zero_value;
auto specified_width = style().width().resolved_or_auto(*this, containing_block.width());
auto specified_height = style().height().resolved_or_auto(*this, containing_block.height());
// FIXME: Actually compute 'width'
auto computed_width = specified_width;
float used_width = specified_width.to_px(*this);
// If 'height' and 'width' both have computed values of 'auto' and the element also has an intrinsic width,
// then that intrinsic width is the used value of 'width'.
if (specified_height.is_auto() && specified_width.is_auto() && has_intrinsic_width()) {
used_width = intrinsic_width();
}
// If 'height' and 'width' both have computed values of 'auto' and the element has no intrinsic width,
// but does have an intrinsic height and intrinsic ratio;
// or if 'width' has a computed value of 'auto',
// 'height' has some other computed value, and the element does have an intrinsic ratio; then the used value of 'width' is:
//
// (used height) * (intrinsic ratio)
else if ((specified_height.is_auto() && specified_width.is_auto() && !has_intrinsic_width() && has_intrinsic_height() && has_intrinsic_ratio()) || (computed_width.is_auto() && has_intrinsic_ratio())) {
used_width = calculate_height() * intrinsic_ratio();
}
else if (computed_width.is_auto() && has_intrinsic_width()) {
used_width = intrinsic_width();
}
else if (computed_width.is_auto()) {
used_width = 300;
}
return used_width;
}
float ReplacedBox::calculate_height() const
{
// 10.6.2 Inline replaced elements, block-level replaced elements in normal flow,
// 'inline-block' replaced elements in normal flow and floating replaced elements
auto& containing_block = *this->containing_block();
auto specified_width = style().width().resolved_or_auto(*this, containing_block.width());
auto specified_height = style().height().resolved_or_auto(*this, containing_block.height());
float used_height = specified_height.to_px(*this);
// If 'height' and 'width' both have computed values of 'auto' and the element also has
// an intrinsic height, then that intrinsic height is the used value of 'height'.
if (specified_width.is_auto() && specified_height.is_auto() && has_intrinsic_height())
used_height = intrinsic_height();
else if (specified_height.is_auto() && has_intrinsic_ratio())
used_height = calculate_width() / intrinsic_ratio();
else if (specified_height.is_auto() && has_intrinsic_height())
used_height = intrinsic_height();
else if (specified_height.is_auto())
used_height = 150;
return used_height;
}
void ReplacedBox::split_into_lines(Layout::BlockBox& container, LayoutMode)
{
// FIXME: This feels out of place. It would be nice if someone at a higher level
// made sure we had usable geometry by the time we start splitting.
prepare_for_replaced_layout();
auto width = calculate_width();
auto height = calculate_height();
auto* line_box = &container.ensure_last_line_box();
if (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);
}
}