632 lines
29 KiB
C++
632 lines
29 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/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/InitialContainingBlockBox.h>
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#include <LibWeb/Layout/InlineFormattingContext.h>
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#include <LibWeb/Layout/ListItemBox.h>
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#include <LibWeb/Layout/WidgetBox.h>
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#include <LibWeb/Page/Frame.h>
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namespace Web::Layout {
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BlockFormattingContext::BlockFormattingContext(Box& context_box, FormattingContext* parent)
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: FormattingContext(context_box, parent)
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{
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}
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BlockFormattingContext::~BlockFormattingContext()
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{
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}
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bool BlockFormattingContext::is_initial() const
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{
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return context_box().is_root();
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}
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void BlockFormattingContext::run(LayoutMode layout_mode)
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{
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if (is_initial()) {
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layout_initial_containing_block(layout_mode);
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return;
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}
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// FIXME: BFC currently computes the width+height of the context box.
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// This is necessary to be able to place absolutely positioned descendants.
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// The same work is also done by the parent BFC for each of its blocks..
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if (layout_mode == LayoutMode::Default)
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compute_width(context_box());
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if (context_box().children_are_inline()) {
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layout_inline_children(layout_mode);
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} else {
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layout_block_level_children(layout_mode);
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}
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if (layout_mode == LayoutMode::Default)
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compute_height(context_box());
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// No need to layout absolute positioned boxes during shrink-to-fit layouts.
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if (layout_mode == LayoutMode::Default)
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layout_absolutely_positioned_descendants();
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}
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void BlockFormattingContext::compute_width(Box& box)
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{
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if (box.is_replaced()) {
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// FIXME: This should not be done *by* ReplacedBox
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auto& replaced = downcast<ReplacedBox>(box);
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replaced.prepare_for_replaced_layout();
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auto width = replaced.calculate_width();
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replaced.set_width(width);
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return;
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}
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if (box.is_absolutely_positioned()) {
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compute_width_for_absolutely_positioned_block(box);
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return;
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}
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auto& style = box.style();
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float width_of_containing_block = box.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(box, width_of_containing_block);
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const auto padding_right = style.padding().right.resolved_or_zero(box, 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(box, width_of_containing_block);
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margin_right = style.margin().right.resolved_or_zero(box, 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(box);
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}
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if (!box.is_replaced() && !box.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(box) + 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(box) + 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 (!box.is_replaced() && box.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(box) - style.border_left().width - padding_left.to_px(box)
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- padding_right.to_px(box) - style.border_right().width - margin_right.to_px(box);
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auto result = calculate_shrink_to_fit_widths(box);
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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(box, 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(box, width_of_containing_block);
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if (!specified_max_width.is_auto()) {
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if (used_width.to_px(box) > specified_max_width.to_px(box)) {
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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(box, width_of_containing_block);
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if (!specified_min_width.is_auto()) {
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if (used_width.to_px(box) < specified_min_width.to_px(box)) {
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used_width = try_compute_width(specified_min_width);
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}
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}
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box.set_width(used_width.to_px(box));
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box.box_model().margin.left = margin_left;
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box.box_model().margin.right = margin_right;
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box.box_model().border.left = CSS::Length::make_px(style.border_left().width);
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box.box_model().border.right = CSS::Length::make_px(style.border_right().width);
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box.box_model().padding.left = padding_left;
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box.box_model().padding.right = padding_right;
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}
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void BlockFormattingContext::compute_width_for_absolutely_positioned_block(Box& box)
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{
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auto& containing_block = context_box();
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auto& style = box.style();
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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, box, containing_block.width());
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const auto padding_right = style.padding().right.resolved(zero_value, box, 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, box, containing_block.width());
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margin_right = style.margin().right.resolved(zero_value, box, containing_block.width());
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auto left = style.offset().left.resolved_or_auto(box, containing_block.width());
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auto right = style.offset().right.resolved_or_auto(box, 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(box) - border_left - padding_left.to_px(box) - width.to_px(box) - padding_right.to_px(box) - border_right - margin_right.to_px(box) - right.to_px(box), 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(box) - margin_left.to_px(box) - border_left - padding_left.to_px(box) - padding_right.to_px(box) - border_right - margin_right.to_px(box) - right.to_px(box), 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(box) - margin_left.to_px(box) - border_left - padding_left.to_px(box) - width.to_px(box) - padding_right.to_px(box) - border_right - margin_right.to_px(box), 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_widths(box);
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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(box)), 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_widths(box);
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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(box)), 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(box, 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(box, containing_block.width());
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if (!specified_max_width.is_auto()) {
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if (used_width.to_px(box) > specified_max_width.to_px(box)) {
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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(box, containing_block.width());
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if (!specified_min_width.is_auto()) {
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if (used_width.to_px(box) < specified_min_width.to_px(box)) {
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used_width = try_compute_width(specified_min_width);
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}
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}
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box.set_width(used_width.to_px(box));
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box.box_model().margin.left = margin_left;
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box.box_model().margin.right = margin_right;
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box.box_model().border.left = CSS::Length::make_px(border_left);
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box.box_model().border.right = CSS::Length::make_px(border_right);
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box.box_model().padding.left = padding_left;
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box.box_model().padding.right = padding_right;
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}
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void BlockFormattingContext::compute_height(Box& box)
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{
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if (box.is_replaced()) {
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// FIXME: This should not be done *by* ReplacedBox
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auto height = downcast<ReplacedBox>(box).calculate_height();
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box.set_height(height);
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return;
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}
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auto& style = box.style();
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auto& containing_block = context_box();
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CSS::Length specified_height;
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if (style.height().is_percentage() && !containing_block.style().height().is_absolute()) {
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specified_height = CSS::Length::make_auto();
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} else {
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specified_height = style.height().resolved_or_auto(box, containing_block.height());
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}
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auto specified_max_height = style.max_height().resolved_or_auto(box, containing_block.height());
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box.box_model().margin.top = style.margin().top.resolved_or_zero(box, containing_block.width());
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box.box_model().margin.bottom = style.margin().bottom.resolved_or_zero(box, containing_block.width());
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box.box_model().border.top = CSS::Length::make_px(style.border_top().width);
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box.box_model().border.bottom = CSS::Length::make_px(style.border_bottom().width);
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box.box_model().padding.top = style.padding().top.resolved_or_zero(box, containing_block.width());
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box.box_model().padding.bottom = style.padding().bottom.resolved_or_zero(box, containing_block.width());
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if (!specified_height.is_auto()) {
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float used_height = specified_height.to_px(box);
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if (!specified_max_height.is_auto())
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used_height = min(used_height, specified_max_height.to_px(box));
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box.set_height(used_height);
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}
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}
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void BlockFormattingContext::layout_inline_children(LayoutMode layout_mode)
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{
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InlineFormattingContext context(context_box(), this);
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context.run(layout_mode);
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}
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void BlockFormattingContext::layout_block_level_children(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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context_box().for_each_in_subtree_of_type<Box>([&](auto& box) {
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if (box.is_absolutely_positioned() || box.containing_block() != &context_box())
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return IterationDecision::Continue;
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compute_width(box);
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layout_inside(box, layout_mode);
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compute_height(box);
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if (box.is_replaced())
|
|
place_block_level_replaced_element_in_normal_flow(box);
|
|
else if (box.is_block())
|
|
place_block_level_non_replaced_element_in_normal_flow(box);
|
|
else
|
|
dbgln("FIXME: Layout::BlockBox::layout_contained_boxes doesn't know how to place a {}", box.class_name());
|
|
|
|
// FIXME: This should be factored differently. It's uncool that we mutate the tree *during* layout!
|
|
// Instead, we should generate the marker box during the tree build.
|
|
if (is<ListItemBox>(box))
|
|
downcast<ListItemBox>(box).layout_marker();
|
|
|
|
content_height = max(content_height, box.effective_offset().y() + box.height() + box.box_model().margin_box(box).bottom);
|
|
content_width = max(content_width, downcast<Box>(box).width());
|
|
return IterationDecision::Continue;
|
|
});
|
|
|
|
if (layout_mode != LayoutMode::Default) {
|
|
if (context_box().style().width().is_undefined() || context_box().style().width().is_auto())
|
|
context_box().set_width(content_width);
|
|
}
|
|
|
|
// FIXME: It's not right to always shrink-wrap the context box to the content here.
|
|
context_box().set_height(content_height);
|
|
}
|
|
|
|
void BlockFormattingContext::place_block_level_replaced_element_in_normal_flow(Box& box)
|
|
{
|
|
auto& containing_block = context_box();
|
|
ASSERT(!containing_block.is_absolutely_positioned());
|
|
auto& replaced_element_box_model = box.box_model();
|
|
|
|
replaced_element_box_model.margin.top = box.style().margin().top.resolved_or_zero(context_box(), containing_block.width());
|
|
replaced_element_box_model.margin.bottom = box.style().margin().bottom.resolved_or_zero(context_box(), containing_block.width());
|
|
replaced_element_box_model.border.top = CSS::Length::make_px(box.style().border_top().width);
|
|
replaced_element_box_model.border.bottom = CSS::Length::make_px(box.style().border_bottom().width);
|
|
replaced_element_box_model.padding.top = box.style().padding().top.resolved_or_zero(context_box(), containing_block.width());
|
|
replaced_element_box_model.padding.bottom = box.style().padding().bottom.resolved_or_zero(context_box(), containing_block.width());
|
|
|
|
float x = replaced_element_box_model.margin.left.to_px(context_box())
|
|
+ replaced_element_box_model.border.left.to_px(context_box())
|
|
+ replaced_element_box_model.padding.left.to_px(context_box())
|
|
+ replaced_element_box_model.offset.left.to_px(context_box());
|
|
|
|
float y = replaced_element_box_model.margin_box(context_box()).top + context_box().box_model().offset.top.to_px(context_box());
|
|
|
|
box.set_offset(x, y);
|
|
}
|
|
|
|
void BlockFormattingContext::place_block_level_non_replaced_element_in_normal_flow(Box& box)
|
|
{
|
|
auto zero_value = CSS::Length::make_px(0);
|
|
auto& containing_block = context_box();
|
|
auto& box_model = box.box_model();
|
|
auto& style = box.style();
|
|
|
|
box_model.margin.top = style.margin().top.resolved(zero_value, containing_block, containing_block.width());
|
|
box_model.margin.bottom = style.margin().bottom.resolved(zero_value, containing_block, 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(zero_value, containing_block, containing_block.width());
|
|
box_model.padding.bottom = style.padding().bottom.resolved(zero_value, containing_block, containing_block.width());
|
|
|
|
float x = box_model.margin.left.to_px(containing_block)
|
|
+ box_model.border.left.to_px(containing_block)
|
|
+ box_model.padding.left.to_px(containing_block)
|
|
+ box_model.offset.left.to_px(containing_block);
|
|
|
|
if (containing_block.style().text_align() == CSS::TextAlign::VendorSpecificCenter) {
|
|
x = (containing_block.width() / 2) - box.width() / 2;
|
|
}
|
|
|
|
float y = box_model.margin_box(containing_block).top
|
|
+ box_model.offset.top.to_px(containing_block);
|
|
|
|
// 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 = box.previous_sibling_of_type<Layout::BlockBox>();
|
|
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() + relevant_sibling->box_model().padding.bottom.to_px(*relevant_sibling);
|
|
|
|
// Collapse top margin with bottom margin of preceding siblings if needed
|
|
float my_margin_top = box_model.margin.top.to_px(containing_block);
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
box.set_offset(x, y);
|
|
}
|
|
|
|
void BlockFormattingContext::layout_initial_containing_block(LayoutMode layout_mode)
|
|
{
|
|
auto viewport_rect = context_box().frame().viewport_rect();
|
|
|
|
auto& icb = downcast<Layout::InitialContainingBlockBox>(context_box());
|
|
icb.build_stacking_context_tree();
|
|
|
|
icb.set_width(viewport_rect.width());
|
|
|
|
layout_block_level_children(layout_mode);
|
|
|
|
ASSERT(!icb.children_are_inline());
|
|
|
|
// FIXME: The ICB should have the height of the viewport.
|
|
// Instead of auto-sizing the ICB, we should spill into overflow.
|
|
float lowest_bottom = 0;
|
|
icb.for_each_child_of_type<Box>([&](auto& child) {
|
|
lowest_bottom = max(lowest_bottom, child.absolute_rect().bottom());
|
|
});
|
|
icb.set_height(lowest_bottom);
|
|
|
|
// No need to layout absolute positioned boxes during shrink-to-fit layouts.
|
|
if (layout_mode == LayoutMode::Default)
|
|
layout_absolutely_positioned_descendants();
|
|
|
|
// FIXME: This is a total hack. Make sure any GUI::Widgets are moved into place after layout.
|
|
// We should stop embedding GUI::Widgets entirely, since that won't work out-of-process.
|
|
icb.for_each_in_subtree_of_type<Layout::WidgetBox>([&](auto& widget) {
|
|
widget.update_widget();
|
|
return IterationDecision::Continue;
|
|
});
|
|
}
|
|
|
|
void BlockFormattingContext::layout_absolutely_positioned_descendants()
|
|
{
|
|
context_box().for_each_in_subtree_of_type<Box>([&](auto& box) {
|
|
if (box.is_absolutely_positioned() && box.containing_block() == &context_box()) {
|
|
layout_absolutely_positioned_descendant(box);
|
|
}
|
|
return IterationDecision::Continue;
|
|
});
|
|
}
|
|
|
|
void BlockFormattingContext::layout_absolutely_positioned_descendant(Box& box)
|
|
{
|
|
auto& containing_block = context_box();
|
|
auto& box_model = box.box_model();
|
|
auto zero_value = CSS::Length::make_px(0);
|
|
|
|
auto specified_width = box.style().width().resolved_or_auto(box, containing_block.width());
|
|
|
|
compute_width(box);
|
|
layout_inside(box, LayoutMode::Default);
|
|
compute_height(box);
|
|
|
|
box_model.margin.left = box.style().margin().left.resolved_or_auto(box, containing_block.width());
|
|
box_model.margin.top = box.style().margin().top.resolved_or_auto(box, containing_block.height());
|
|
box_model.margin.right = box.style().margin().right.resolved_or_auto(box, containing_block.width());
|
|
box_model.margin.bottom = box.style().margin().bottom.resolved_or_auto(box, containing_block.height());
|
|
|
|
box_model.border.left = CSS::Length::make_px(box.style().border_left().width);
|
|
box_model.border.right = CSS::Length::make_px(box.style().border_right().width);
|
|
box_model.border.top = CSS::Length::make_px(box.style().border_top().width);
|
|
box_model.border.bottom = CSS::Length::make_px(box.style().border_bottom().width);
|
|
|
|
box_model.offset.left = box.style().offset().left.resolved_or_auto(box, containing_block.width());
|
|
box_model.offset.top = box.style().offset().top.resolved_or_auto(box, containing_block.height());
|
|
box_model.offset.right = box.style().offset().right.resolved_or_auto(box, containing_block.width());
|
|
box_model.offset.bottom = box.style().offset().bottom.resolved_or_auto(box, containing_block.height());
|
|
|
|
if (box_model.offset.left.is_auto() && specified_width.is_auto() && box_model.offset.right.is_auto()) {
|
|
if (box_model.margin.left.is_auto())
|
|
box_model.margin.left = zero_value;
|
|
if (box_model.margin.right.is_auto())
|
|
box_model.margin.right = zero_value;
|
|
}
|
|
|
|
Gfx::FloatPoint used_offset;
|
|
|
|
if (!box_model.offset.left.is_auto()) {
|
|
float x_offset = box_model.offset.left.to_px(box)
|
|
+ box_model.border_box(box).left;
|
|
used_offset.set_x(x_offset + box_model.margin.left.to_px(box));
|
|
} else if (!box_model.offset.right.is_auto()) {
|
|
float x_offset = 0
|
|
- box_model.offset.right.to_px(box)
|
|
- box_model.border_box(box).right;
|
|
used_offset.set_x(containing_block.width() + x_offset - box.width() - box_model.margin.right.to_px(box));
|
|
} else {
|
|
float x_offset = box_model.margin_box(box).left;
|
|
used_offset.set_x(x_offset);
|
|
}
|
|
|
|
if (!box_model.offset.top.is_auto()) {
|
|
float y_offset = box_model.offset.top.to_px(box)
|
|
+ box_model.border_box(box).top;
|
|
used_offset.set_y(y_offset + box_model.margin.top.to_px(box));
|
|
} else if (!box_model.offset.bottom.is_auto()) {
|
|
float y_offset = 0
|
|
- box_model.offset.bottom.to_px(box)
|
|
- box_model.border_box(box).bottom;
|
|
used_offset.set_y(containing_block.height() + y_offset - box.height() - box_model.margin.bottom.to_px(box));
|
|
} else {
|
|
float y_offset = box_model.margin_box(box).top;
|
|
used_offset.set_y(y_offset);
|
|
}
|
|
|
|
box.set_offset(used_offset);
|
|
}
|
|
|
|
}
|