зеркало из https://github.com/mozilla/gecko-dev.git
999 строки
44 KiB
Rust
999 строки
44 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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//! Layout for elements with a CSS `display` property of `flex`.
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#![deny(unsafe_code)]
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use app_units::{Au, MAX_AU};
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use block::{BlockFlow, MarginsMayCollapseFlag};
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use context::LayoutContext;
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use display_list_builder::{DisplayListBuildState, FlexFlowDisplayListBuilding};
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use euclid::Point2D;
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use floats::FloatKind;
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use flow;
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use flow::{Flow, FlowClass, ImmutableFlowUtils, OpaqueFlow};
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use flow::{INLINE_POSITION_IS_STATIC, IS_ABSOLUTELY_POSITIONED};
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use fragment::{Fragment, FragmentBorderBoxIterator, Overflow};
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use layout_debug;
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use model::{IntrinsicISizes, MaybeAuto, SizeConstraint};
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use std::cmp::{max, min};
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use std::ops::Range;
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use style::computed_values::{align_content, align_self, flex_direction, flex_wrap, justify_content};
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use style::computed_values::border_collapse;
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use style::logical_geometry::{Direction, LogicalSize};
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use style::properties::ComputedValues;
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use style::servo::restyle_damage::{REFLOW, REFLOW_OUT_OF_FLOW};
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use style::values::computed::{LengthOrPercentage, LengthOrPercentageOrAuto, LengthOrPercentageOrNone};
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use style::values::computed::flex::FlexBasis;
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use style::values::generics::flex::FlexBasis as GenericFlexBasis;
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/// The size of an axis. May be a specified size, a min/max
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/// constraint, or an unlimited size
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#[derive(Debug, Serialize)]
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enum AxisSize {
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Definite(Au),
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MinMax(SizeConstraint),
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Infinite,
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}
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impl AxisSize {
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/// Generate a new available cross or main axis size from the specified size of the container,
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/// containing block size, min constraint, and max constraint
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pub fn new(size: LengthOrPercentageOrAuto, content_size: Option<Au>, min: LengthOrPercentage,
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max: LengthOrPercentageOrNone) -> AxisSize {
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match size {
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LengthOrPercentageOrAuto::Length(length) => AxisSize::Definite(length),
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LengthOrPercentageOrAuto::Percentage(percent) => {
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match content_size {
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Some(size) => AxisSize::Definite(size.scale_by(percent.0)),
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None => AxisSize::Infinite
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}
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}
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LengthOrPercentageOrAuto::Calc(calc) => {
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match calc.to_used_value(content_size) {
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Some(length) => AxisSize::Definite(length),
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None => AxisSize::Infinite,
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}
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}
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LengthOrPercentageOrAuto::Auto => {
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AxisSize::MinMax(SizeConstraint::new(content_size, min, max, None))
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}
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}
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}
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}
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/// This function accepts the flex-basis and the size property in main direction from style,
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/// and the container size, then return the used value of flex basis. it can be used to help
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/// determining the flex base size and to indicate whether the main size of the item
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/// is definite after flex size resolving.
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fn from_flex_basis(
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flex_basis: FlexBasis,
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main_length: LengthOrPercentageOrAuto,
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containing_length: Option<Au>
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) -> MaybeAuto {
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match (flex_basis, containing_length) {
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(GenericFlexBasis::Length(LengthOrPercentage::Length(length)), _) =>
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MaybeAuto::Specified(length),
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(GenericFlexBasis::Length(LengthOrPercentage::Percentage(percent)), Some(size)) =>
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MaybeAuto::Specified(size.scale_by(percent.0)),
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(GenericFlexBasis::Length(LengthOrPercentage::Percentage(_)), None) =>
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MaybeAuto::Auto,
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(GenericFlexBasis::Length(LengthOrPercentage::Calc(calc)), _) =>
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MaybeAuto::from_option(calc.to_used_value(containing_length)),
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(GenericFlexBasis::Content, _) =>
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MaybeAuto::Auto,
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(GenericFlexBasis::Auto, Some(size)) =>
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MaybeAuto::from_style(main_length, size),
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(GenericFlexBasis::Auto, None) => {
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if let LengthOrPercentageOrAuto::Length(length) = main_length {
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MaybeAuto::Specified(length)
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} else {
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MaybeAuto::Auto
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}
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}
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}
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}
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/// Represents a child in a flex container. Most fields here are used in
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/// flex size resolving, and items are sorted by the 'order' property.
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#[derive(Debug, Serialize)]
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struct FlexItem {
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/// Main size of a flex item, used to store results of flexible length calcuation.
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pub main_size: Au,
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/// Used flex base size.
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pub base_size: Au,
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/// The minimal size in main direction.
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pub min_size: Au,
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/// The maximal main size. If this property is not actually set by style
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/// It will be the largest size available for code reuse.
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pub max_size: Au,
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/// The index of the actual flow in our child list.
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pub index: usize,
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/// The 'flex-grow' property of this item.
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pub flex_grow: f32,
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/// The 'flex-shrink' property of this item.
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pub flex_shrink: f32,
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/// The 'order' property of this item.
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pub order: i32,
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/// Whether the main size has met its constraint.
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pub is_frozen: bool,
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/// True if this flow has property 'visibility::collapse'.
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pub is_strut: bool
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}
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impl FlexItem {
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pub fn new(index: usize, flow: &Flow) -> FlexItem {
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let style = &flow.as_block().fragment.style;
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let flex_grow = style.get_position().flex_grow;
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let flex_shrink = style.get_position().flex_shrink;
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let order = style.get_position().order;
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// TODO(stshine): for item with 'visibility:collapse', set is_strut to true.
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FlexItem {
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main_size: Au(0),
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base_size: Au(0),
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min_size: Au(0),
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max_size: MAX_AU,
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index: index,
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flex_grow: flex_grow,
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flex_shrink: flex_shrink,
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order: order,
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is_frozen: false,
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is_strut: false
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}
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}
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/// Initialize the used flex base size, minimal main size and maximal main size.
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/// For block mode container this method should be called in assign_block_size()
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/// pass so that the item has already been layouted.
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pub fn init_sizes(&mut self, flow: &mut Flow, containing_length: Au, direction: Direction) {
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let block = flow.as_mut_block();
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match direction {
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// TODO(stshine): the definition of min-{width, height} in style component
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// should change to LengthOrPercentageOrAuto for automatic implied minimal size.
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// https://drafts.csswg.org/css-flexbox-1/#min-size-auto
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Direction::Inline => {
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let basis = from_flex_basis(block.fragment.style.get_position().flex_basis,
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block.fragment.style.content_inline_size(),
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Some(containing_length));
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// These methods compute auto margins to zero length, which is exactly what we want.
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block.fragment.compute_border_and_padding(containing_length,
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border_collapse::T::separate);
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block.fragment.compute_inline_direction_margins(containing_length);
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block.fragment.compute_block_direction_margins(containing_length);
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let (border_padding, margin) = block.fragment.surrounding_intrinsic_inline_size();
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let content_size = block.base.intrinsic_inline_sizes.preferred_inline_size
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- border_padding
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- margin
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+ block.fragment.box_sizing_boundary(direction);
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self.base_size = basis.specified_or_default(content_size);
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self.max_size =
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block.fragment.style.max_inline_size()
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.to_used_value(containing_length)
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.unwrap_or(MAX_AU);
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self.min_size = block.fragment.style.min_inline_size().to_used_value(containing_length);
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}
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Direction::Block => {
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let basis = from_flex_basis(block.fragment.style.get_position().flex_basis,
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block.fragment.style.content_block_size(),
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Some(containing_length));
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let content_size = block.fragment.border_box.size.block
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- block.fragment.border_padding.block_start_end()
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+ block.fragment.box_sizing_boundary(direction);
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self.base_size = basis.specified_or_default(content_size);
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self.max_size =
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block.fragment.style.max_block_size()
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.to_used_value(containing_length)
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.unwrap_or(MAX_AU);
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self.min_size = block.fragment.style.min_block_size().to_used_value(containing_length);
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}
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}
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}
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/// Returns the outer main size of the item, including paddings and margins,
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/// clamped by max and min size.
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pub fn outer_main_size(&self, flow: &Flow, direction: Direction) -> Au {
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let ref fragment = flow.as_block().fragment;
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let outer_width = match direction {
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Direction::Inline => {
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fragment.border_padding.inline_start_end() + fragment.margin.inline_start_end()
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}
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Direction::Block => {
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fragment.border_padding.block_start_end() + fragment.margin.block_start_end()
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}
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};
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max(self.min_size, min(self.base_size, self.max_size))
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- fragment.box_sizing_boundary(direction) + outer_width
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}
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/// Returns the number of auto margins in given direction.
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pub fn auto_margin_count(&self, flow: &Flow, direction: Direction) -> i32 {
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let margin = flow.as_block().fragment.style.logical_margin();
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let mut margin_count = 0;
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match direction {
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Direction::Inline => {
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if margin.inline_start == LengthOrPercentageOrAuto::Auto {
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margin_count += 1;
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}
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if margin.inline_end == LengthOrPercentageOrAuto::Auto {
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margin_count += 1;
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}
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}
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Direction::Block => {
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if margin.block_start == LengthOrPercentageOrAuto::Auto {
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margin_count += 1;
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}
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if margin.block_end == LengthOrPercentageOrAuto::Auto {
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margin_count += 1;
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}
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}
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}
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margin_count
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}
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}
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/// A line in a flex container.
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// TODO(stshine): More fields are required to handle collapsed items and baseline alignment.
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#[derive(Debug, Serialize)]
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struct FlexLine {
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/// Range of items belong to this line in 'self.items'.
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pub range: Range<usize>,
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/// Remaining free space of this line, items will grow or shrink based on it being positive or negative.
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pub free_space: Au,
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/// The number of auto margins of items.
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pub auto_margin_count: i32,
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/// Line size in the block direction.
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pub cross_size: Au,
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}
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impl FlexLine {
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pub fn new(range: Range<usize>, free_space: Au, auto_margin_count: i32) -> FlexLine {
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FlexLine {
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range: range,
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auto_margin_count: auto_margin_count,
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free_space: free_space,
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cross_size: Au(0)
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}
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}
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/// This method implements the flexible lengths resolving algorithm.
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/// The 'collapse' parameter is used to indicate whether items with 'visibility: collapse'
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/// is included in length resolving. The result main size is stored in 'item.main_size'.
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/// https://drafts.csswg.org/css-flexbox/#resolve-flexible-lengths
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pub fn flex_resolve(&mut self, items: &mut [FlexItem], collapse: bool) {
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let mut total_grow = 0.0;
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let mut total_shrink = 0.0;
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let mut total_scaled = 0.0;
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let mut active_count = 0;
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// Iterate through items, collect total factors and freeze those that have already met
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// their constraints or won't grow/shrink in corresponding scenario.
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// https://drafts.csswg.org/css-flexbox/#resolve-flexible-lengths
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for item in items.iter_mut().filter(|i| !(i.is_strut && collapse)) {
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item.main_size = max(item.min_size, min(item.base_size, item.max_size));
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if (self.free_space > Au(0) && (item.flex_grow == 0.0 || item.base_size >= item.max_size)) ||
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(self.free_space < Au(0) && (item.flex_shrink == 0.0 || item.base_size <= item.min_size)) {
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item.is_frozen = true;
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} else {
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item.is_frozen = false;
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total_grow += item.flex_grow;
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total_shrink += item.flex_shrink;
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// The scaled factor is used to calculate flex shrink
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total_scaled += item.flex_shrink * item.base_size.0 as f32;
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active_count += 1;
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}
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}
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let initial_free_space = self.free_space;
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let mut total_variation = Au(1);
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// If there is no remaining free space or all items are frozen, stop loop.
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while total_variation != Au(0) && self.free_space != Au(0) && active_count > 0 {
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self.free_space =
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// https://drafts.csswg.org/css-flexbox/#remaining-free-space
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if self.free_space > Au(0) {
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min(initial_free_space.scale_by(total_grow), self.free_space)
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} else {
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max(initial_free_space.scale_by(total_shrink), self.free_space)
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};
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total_variation = Au(0);
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for item in items.iter_mut().filter(|i| !i.is_frozen).filter(|i| !(i.is_strut && collapse)) {
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// Use this and the 'abs()' below to make the code work in both grow and shrink scenarios.
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let (factor, end_size) = if self.free_space > Au(0) {
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(item.flex_grow / total_grow, item.max_size)
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} else {
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(item.flex_shrink * item.base_size.0 as f32 / total_scaled, item.min_size)
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};
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let variation = self.free_space.scale_by(factor);
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if variation.0.abs() >= (end_size - item.main_size).0.abs() {
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// Use constraint as the target main size, and freeze item.
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total_variation += end_size - item.main_size;
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item.main_size = end_size;
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item.is_frozen = true;
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active_count -= 1;
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total_shrink -= item.flex_shrink;
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total_grow -= item.flex_grow;
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total_scaled -= item.flex_shrink * item.base_size.0 as f32;
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} else {
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total_variation += variation;
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item.main_size += variation;
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}
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}
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self.free_space -= total_variation;
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}
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}
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}
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/// A block with the CSS `display` property equal to `flex`.
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#[derive(Debug, Serialize)]
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pub struct FlexFlow {
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/// Data common to all block flows.
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block_flow: BlockFlow,
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/// The logical axis which the main axis will be parallel with.
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/// The cross axis will be parallel with the opposite logical axis.
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main_mode: Direction,
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/// The available main axis size
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available_main_size: AxisSize,
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/// The available cross axis size
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available_cross_size: AxisSize,
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/// List of flex lines in the container.
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lines: Vec<FlexLine>,
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/// List of flex-items that belong to this flex-container
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items: Vec<FlexItem>,
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/// True if the flex-direction is *-reversed
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main_reverse: bool,
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/// True if this flex container can be multiline.
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is_wrappable: bool,
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/// True if the cross direction is reversed.
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cross_reverse: bool
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}
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impl FlexFlow {
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pub fn from_fragment(fragment: Fragment,
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flotation: Option<FloatKind>)
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-> FlexFlow {
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let main_mode;
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let main_reverse;
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let is_wrappable;
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let cross_reverse;
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{
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let style = fragment.style();
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let (mode, reverse) = match style.get_position().flex_direction {
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flex_direction::T::row => (Direction::Inline, false),
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flex_direction::T::row_reverse => (Direction::Inline, true),
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flex_direction::T::column => (Direction::Block, false),
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flex_direction::T::column_reverse => (Direction::Block, true),
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};
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main_mode = mode;
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main_reverse =
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reverse == style.writing_mode.is_bidi_ltr();
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let (wrappable, reverse) = match fragment.style.get_position().flex_wrap {
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flex_wrap::T::nowrap => (false, false),
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flex_wrap::T::wrap => (true, false),
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flex_wrap::T::wrap_reverse => (true, true),
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};
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is_wrappable = wrappable;
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// TODO(stshine): Handle vertical writing mode.
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cross_reverse = reverse;
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}
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FlexFlow {
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block_flow: BlockFlow::from_fragment_and_float_kind(fragment, flotation),
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main_mode: main_mode,
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available_main_size: AxisSize::Infinite,
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available_cross_size: AxisSize::Infinite,
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lines: Vec::new(),
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items: Vec::new(),
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main_reverse: main_reverse,
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is_wrappable: is_wrappable,
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cross_reverse: cross_reverse
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}
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}
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pub fn main_mode(&self) -> Direction {
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self.main_mode
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}
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/// Returns a line start after the last item that is already in a line.
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/// Note that when the container main size is infinite(i.e. A column flexbox with auto height),
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/// we do not need to do flex resolving and this can be considered as a fast-path, so the
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/// 'container_size' param does not need to be 'None'. A line has to contain at least one item;
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/// (except this) if the container can be multi-line the sum of outer main size of items should
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/// be less than the container size; a line should be filled by items as much as possible.
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/// After been collected in a line a item should have its main sizes initialized.
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fn get_flex_line(&mut self, container_size: Au) -> Option<FlexLine> {
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let start = self.lines.last().map(|line| line.range.end).unwrap_or(0);
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if start == self.items.len() {
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return None;
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}
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let mut end = start;
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let mut total_line_size = Au(0);
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let mut margin_count = 0;
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let items = &mut self.items[start..];
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let mut children = self.block_flow.base.children.random_access_mut();
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for mut item in items {
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let kid = children.get(item.index);
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item.init_sizes(kid, container_size, self.main_mode);
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let outer_main_size = item.outer_main_size(kid, self.main_mode);
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if total_line_size + outer_main_size > container_size && end != start && self.is_wrappable {
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break;
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}
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margin_count += item.auto_margin_count(kid, self.main_mode);
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total_line_size += outer_main_size;
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end += 1;
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}
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let line = FlexLine::new(start..end, container_size - total_line_size, margin_count);
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Some(line)
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}
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// TODO(zentner): This function should use flex-basis.
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// Currently, this is the core of BlockFlow::bubble_inline_sizes() with all float logic
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// stripped out, and max replaced with union_nonbreaking_inline.
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fn inline_mode_bubble_inline_sizes(&mut self) {
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let fixed_width = match self.block_flow.fragment.style().get_position().width {
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LengthOrPercentageOrAuto::Length(_) => true,
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_ => false,
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};
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let mut computation = self.block_flow.fragment.compute_intrinsic_inline_sizes();
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if !fixed_width {
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for kid in self.block_flow.base.children.iter_mut() {
|
|
let base = flow::mut_base(kid);
|
|
let is_absolutely_positioned = base.flags.contains(IS_ABSOLUTELY_POSITIONED);
|
|
if !is_absolutely_positioned {
|
|
let flex_item_inline_sizes = IntrinsicISizes {
|
|
minimum_inline_size: base.intrinsic_inline_sizes.minimum_inline_size,
|
|
preferred_inline_size: base.intrinsic_inline_sizes.preferred_inline_size,
|
|
};
|
|
computation.union_nonbreaking_inline(&flex_item_inline_sizes);
|
|
}
|
|
}
|
|
}
|
|
self.block_flow.base.intrinsic_inline_sizes = computation.finish();
|
|
}
|
|
|
|
// TODO(zentner): This function should use flex-basis.
|
|
// Currently, this is the core of BlockFlow::bubble_inline_sizes() with all float logic
|
|
// stripped out.
|
|
fn block_mode_bubble_inline_sizes(&mut self) {
|
|
let fixed_width = match self.block_flow.fragment.style().get_position().width {
|
|
LengthOrPercentageOrAuto::Length(_) => true,
|
|
_ => false,
|
|
};
|
|
|
|
let mut computation = self.block_flow.fragment.compute_intrinsic_inline_sizes();
|
|
if !fixed_width {
|
|
for kid in self.block_flow.base.children.iter_mut() {
|
|
let base = flow::mut_base(kid);
|
|
let is_absolutely_positioned = base.flags.contains(IS_ABSOLUTELY_POSITIONED);
|
|
if !is_absolutely_positioned {
|
|
computation.content_intrinsic_sizes.minimum_inline_size =
|
|
max(computation.content_intrinsic_sizes.minimum_inline_size,
|
|
base.intrinsic_inline_sizes.minimum_inline_size);
|
|
|
|
computation.content_intrinsic_sizes.preferred_inline_size =
|
|
max(computation.content_intrinsic_sizes.preferred_inline_size,
|
|
base.intrinsic_inline_sizes.preferred_inline_size);
|
|
}
|
|
}
|
|
}
|
|
self.block_flow.base.intrinsic_inline_sizes = computation.finish();
|
|
}
|
|
|
|
// TODO(zentner): This function needs to be radically different for multi-line flexbox.
|
|
// Currently, this is the core of BlockFlow::propagate_assigned_inline_size_to_children() with
|
|
// all float and table logic stripped out.
|
|
fn block_mode_assign_inline_sizes(&mut self,
|
|
_layout_context: &LayoutContext,
|
|
inline_start_content_edge: Au,
|
|
inline_end_content_edge: Au,
|
|
content_inline_size: Au) {
|
|
let _scope = layout_debug_scope!("flex::block_mode_assign_inline_sizes");
|
|
debug!("flex::block_mode_assign_inline_sizes");
|
|
|
|
// FIXME (mbrubeck): Get correct mode for absolute containing block
|
|
let containing_block_mode = self.block_flow.base.writing_mode;
|
|
|
|
let container_block_size = match self.available_main_size {
|
|
AxisSize::Definite(length) => Some(length),
|
|
_ => None
|
|
};
|
|
let container_inline_size = match self.available_cross_size {
|
|
AxisSize::Definite(length) => length,
|
|
AxisSize::MinMax(ref constraint) => constraint.clamp(content_inline_size),
|
|
AxisSize::Infinite => content_inline_size
|
|
};
|
|
|
|
let mut children = self.block_flow.base.children.random_access_mut();
|
|
for kid in &mut self.items {
|
|
let kid_base = flow::mut_base(children.get(kid.index));
|
|
kid_base.block_container_explicit_block_size = container_block_size;
|
|
if kid_base.flags.contains(INLINE_POSITION_IS_STATIC) {
|
|
// The inline-start margin edge of the child flow is at our inline-start content
|
|
// edge, and its inline-size is our content inline-size.
|
|
kid_base.position.start.i =
|
|
if kid_base.writing_mode.is_bidi_ltr() == containing_block_mode.is_bidi_ltr() {
|
|
inline_start_content_edge
|
|
} else {
|
|
// The kid's inline 'start' is at the parent's 'end'
|
|
inline_end_content_edge
|
|
};
|
|
}
|
|
kid_base.block_container_inline_size = container_inline_size;
|
|
kid_base.block_container_writing_mode = containing_block_mode;
|
|
kid_base.position.start.i = inline_start_content_edge;
|
|
}
|
|
}
|
|
|
|
fn inline_mode_assign_inline_sizes(&mut self,
|
|
layout_context: &LayoutContext,
|
|
inline_start_content_edge: Au,
|
|
_inline_end_content_edge: Au,
|
|
content_inline_size: Au) {
|
|
let _scope = layout_debug_scope!("flex::inline_mode_assign_inline_sizes");
|
|
debug!("inline_mode_assign_inline_sizes");
|
|
|
|
debug!("content_inline_size = {:?}", content_inline_size);
|
|
|
|
let child_count = ImmutableFlowUtils::child_count(self as &Flow) as i32;
|
|
debug!("child_count = {:?}", child_count);
|
|
if child_count == 0 {
|
|
return;
|
|
}
|
|
|
|
let inline_size = match self.available_main_size {
|
|
AxisSize::Definite(length) => length,
|
|
AxisSize::MinMax(ref constraint) => constraint.clamp(content_inline_size),
|
|
AxisSize::Infinite => content_inline_size,
|
|
};
|
|
|
|
let container_mode = self.block_flow.base.block_container_writing_mode;
|
|
self.block_flow.base.position.size.inline = inline_size;
|
|
|
|
// Calculate non-auto block size to pass to children.
|
|
let box_border = self.block_flow.fragment.box_sizing_boundary(Direction::Block);
|
|
|
|
let parent_container_size =
|
|
self.block_flow.explicit_block_containing_size(layout_context.shared_context());
|
|
// https://drafts.csswg.org/css-ui-3/#box-sizing
|
|
let explicit_content_size = self
|
|
.block_flow
|
|
.explicit_block_size(parent_container_size)
|
|
.map(|x| max(x - box_border, Au(0)));
|
|
let containing_block_text_align =
|
|
self.block_flow.fragment.style().get_inheritedtext().text_align;
|
|
|
|
while let Some(mut line) = self.get_flex_line(inline_size) {
|
|
let items = &mut self.items[line.range.clone()];
|
|
line.flex_resolve(items, false);
|
|
// TODO(stshine): if this flex line contain children that have
|
|
// property visibility:collapse, exclude them and resolve again.
|
|
|
|
let item_count = items.len() as i32;
|
|
let mut cur_i = inline_start_content_edge;
|
|
let item_interval = if line.free_space >= Au(0) && line.auto_margin_count == 0 {
|
|
match self.block_flow.fragment.style().get_position().justify_content {
|
|
justify_content::T::space_between => {
|
|
if item_count == 1 {
|
|
Au(0)
|
|
} else {
|
|
line.free_space / (item_count - 1)
|
|
}
|
|
}
|
|
justify_content::T::space_around => {
|
|
line.free_space / item_count
|
|
}
|
|
_ => Au(0),
|
|
}
|
|
} else {
|
|
Au(0)
|
|
};
|
|
|
|
match self.block_flow.fragment.style().get_position().justify_content {
|
|
// Overflow equally in both ends of line.
|
|
justify_content::T::center | justify_content::T::space_around => {
|
|
cur_i += (line.free_space - item_interval * (item_count - 1)) / 2;
|
|
}
|
|
justify_content::T::flex_end => {
|
|
cur_i += line.free_space;
|
|
}
|
|
_ => {}
|
|
}
|
|
|
|
let mut children = self.block_flow.base.children.random_access_mut();
|
|
for item in items.iter_mut() {
|
|
let mut block = children.get(item.index).as_mut_block();
|
|
|
|
block.base.block_container_writing_mode = container_mode;
|
|
block.base.block_container_inline_size = inline_size;
|
|
block.base.block_container_explicit_block_size = explicit_content_size;
|
|
// Per CSS 2.1 § 16.3.1, text alignment propagates to all children in flow.
|
|
//
|
|
// TODO(#2265, pcwalton): Do this in the cascade instead.
|
|
block.base.flags.set_text_align(containing_block_text_align);
|
|
|
|
let margin = block.fragment.style().logical_margin();
|
|
let auto_len =
|
|
if line.auto_margin_count == 0 || line.free_space <= Au(0) {
|
|
Au(0)
|
|
} else {
|
|
line.free_space / line.auto_margin_count
|
|
};
|
|
let margin_inline_start = MaybeAuto::from_style(margin.inline_start, inline_size)
|
|
.specified_or_default(auto_len);
|
|
let margin_inline_end = MaybeAuto::from_style(margin.inline_end, inline_size)
|
|
.specified_or_default(auto_len);
|
|
let item_inline_size = item.main_size
|
|
- block.fragment.box_sizing_boundary(self.main_mode)
|
|
+ block.fragment.border_padding.inline_start_end();
|
|
let item_outer_size = item_inline_size + block.fragment.margin.inline_start_end();
|
|
|
|
block.fragment.margin.inline_start = margin_inline_start;
|
|
block.fragment.margin.inline_end = margin_inline_end;
|
|
block.fragment.border_box.start.i = margin_inline_start;
|
|
block.fragment.border_box.size.inline = item_inline_size;
|
|
block.base.position.start.i = if !self.main_reverse {
|
|
cur_i
|
|
} else {
|
|
inline_start_content_edge * 2 + content_inline_size - cur_i - item_outer_size
|
|
};
|
|
block.base.position.size.inline = item_outer_size;
|
|
cur_i += item_outer_size + item_interval;
|
|
}
|
|
self.lines.push(line);
|
|
}
|
|
}
|
|
|
|
// TODO(zentner): This function should actually flex elements!
|
|
fn block_mode_assign_block_size(&mut self) {
|
|
let mut cur_b = if !self.main_reverse {
|
|
self.block_flow.fragment.border_padding.block_start
|
|
} else {
|
|
self.block_flow.fragment.border_box.size.block
|
|
};
|
|
|
|
let mut children = self.block_flow.base.children.random_access_mut();
|
|
for item in &mut self.items {
|
|
let mut base = flow::mut_base(children.get(item.index));
|
|
if !self.main_reverse {
|
|
base.position.start.b = cur_b;
|
|
cur_b = cur_b + base.position.size.block;
|
|
} else {
|
|
cur_b = cur_b - base.position.size.block;
|
|
base.position.start.b = cur_b;
|
|
}
|
|
}
|
|
}
|
|
|
|
fn inline_mode_assign_block_size(&mut self, layout_context: &LayoutContext) {
|
|
let _scope = layout_debug_scope!("flex::inline_mode_assign_block_size");
|
|
|
|
let line_count = self.lines.len() as i32;
|
|
let line_align = self.block_flow.fragment.style().get_position().align_content;
|
|
let mut cur_b = self.block_flow.fragment.border_padding.block_start;
|
|
let mut total_cross_size = Au(0);
|
|
let mut line_interval = Au(0);
|
|
|
|
{
|
|
let mut children = self.block_flow.base.children.random_access_mut();
|
|
for line in self.lines.iter_mut() {
|
|
for item in &self.items[line.range.clone()] {
|
|
let fragment = &children.get(item.index).as_block().fragment;
|
|
line.cross_size = max(line.cross_size,
|
|
fragment.border_box.size.block +
|
|
fragment.margin.block_start_end());
|
|
}
|
|
total_cross_size += line.cross_size;
|
|
}
|
|
}
|
|
|
|
let box_border = self.block_flow.fragment.box_sizing_boundary(Direction::Block);
|
|
let parent_container_size =
|
|
self.block_flow.explicit_block_containing_size(layout_context.shared_context());
|
|
// https://drafts.csswg.org/css-ui-3/#box-sizing
|
|
let explicit_content_size = self
|
|
.block_flow
|
|
.explicit_block_size(parent_container_size)
|
|
.map(|x| max(x - box_border, Au(0)));
|
|
|
|
if let Some(container_block_size) = explicit_content_size {
|
|
let free_space = container_block_size - total_cross_size;
|
|
total_cross_size = container_block_size;
|
|
|
|
if line_align == align_content::T::stretch && free_space > Au(0) {
|
|
for line in self.lines.iter_mut() {
|
|
line.cross_size += free_space / line_count;
|
|
}
|
|
}
|
|
|
|
line_interval = match line_align {
|
|
align_content::T::space_between => {
|
|
if line_count == 1 {
|
|
Au(0)
|
|
} else {
|
|
free_space / (line_count - 1)
|
|
}
|
|
}
|
|
align_content::T::space_around => {
|
|
free_space / line_count
|
|
}
|
|
_ => Au(0),
|
|
};
|
|
|
|
match line_align {
|
|
align_content::T::center | align_content::T::space_around => {
|
|
cur_b += (free_space - line_interval * (line_count - 1)) / 2;
|
|
}
|
|
align_content::T::flex_end => {
|
|
cur_b += free_space;
|
|
}
|
|
_ => {}
|
|
}
|
|
}
|
|
|
|
let mut children = self.block_flow.base.children.random_access_mut();
|
|
for line in &self.lines {
|
|
for item in self.items[line.range.clone()].iter_mut() {
|
|
let block = children.get(item.index).as_mut_block();
|
|
let auto_margin_count = item.auto_margin_count(block, Direction::Block);
|
|
let margin = block.fragment.style().logical_margin();
|
|
|
|
let mut margin_block_start = block.fragment.margin.block_start;
|
|
let mut margin_block_end = block.fragment.margin.block_end;
|
|
let mut free_space = line.cross_size - block.base.position.size.block
|
|
- block.fragment.margin.block_start_end();
|
|
|
|
// The spec is a little vague here, but if I understand it correctly, the outer
|
|
// cross size of item should equal to the line size if any auto margin exists.
|
|
// https://drafts.csswg.org/css-flexbox/#algo-cross-margins
|
|
if auto_margin_count > 0 {
|
|
if margin.block_start == LengthOrPercentageOrAuto::Auto {
|
|
margin_block_start = if free_space < Au(0) {
|
|
Au(0)
|
|
} else {
|
|
free_space / auto_margin_count
|
|
};
|
|
}
|
|
margin_block_end = line.cross_size - margin_block_start - block.base.position.size.block;
|
|
free_space = Au(0);
|
|
}
|
|
|
|
let self_align = block.fragment.style().get_position().align_self;
|
|
if self_align == align_self::T::stretch &&
|
|
block.fragment.style().content_block_size() == LengthOrPercentageOrAuto::Auto {
|
|
free_space = Au(0);
|
|
block.base.block_container_explicit_block_size = Some(line.cross_size);
|
|
block.base.position.size.block =
|
|
line.cross_size - margin_block_start - margin_block_end;
|
|
block.fragment.border_box.size.block = block.base.position.size.block;
|
|
// FIXME(stshine): item with 'align-self: stretch' and auto cross size should act
|
|
// as if it has a fixed cross size, all child blocks should resolve against it.
|
|
// block.assign_block_size(layout_context);
|
|
}
|
|
block.base.position.start.b = margin_block_start +
|
|
if !self.cross_reverse {
|
|
cur_b
|
|
} else {
|
|
self.block_flow.fragment.border_padding.block_start * 2
|
|
+ total_cross_size - cur_b - line.cross_size
|
|
};
|
|
// TODO(stshine): support baseline alignment.
|
|
if free_space != Au(0) {
|
|
let flex_cross = match self_align {
|
|
align_self::T::flex_end => free_space,
|
|
align_self::T::center => free_space / 2,
|
|
_ => Au(0),
|
|
};
|
|
block.base.position.start.b +=
|
|
if !self.cross_reverse {
|
|
flex_cross
|
|
} else {
|
|
free_space - flex_cross
|
|
};
|
|
}
|
|
}
|
|
cur_b += line_interval + line.cross_size;
|
|
}
|
|
let total_block_size = total_cross_size + self.block_flow.fragment.border_padding.block_start_end();
|
|
self.block_flow.fragment.border_box.size.block = total_block_size;
|
|
self.block_flow.base.position.size.block = total_block_size;
|
|
|
|
}
|
|
}
|
|
|
|
impl Flow for FlexFlow {
|
|
fn class(&self) -> FlowClass {
|
|
FlowClass::Flex
|
|
}
|
|
|
|
fn as_mut_flex(&mut self) -> &mut FlexFlow {
|
|
self
|
|
}
|
|
|
|
fn as_flex(&self) -> &FlexFlow {
|
|
self
|
|
}
|
|
|
|
fn as_block(&self) -> &BlockFlow {
|
|
&self.block_flow
|
|
}
|
|
|
|
fn as_mut_block(&mut self) -> &mut BlockFlow {
|
|
&mut self.block_flow
|
|
}
|
|
|
|
fn mark_as_root(&mut self) {
|
|
self.block_flow.mark_as_root();
|
|
}
|
|
|
|
fn bubble_inline_sizes(&mut self) {
|
|
let _scope = layout_debug_scope!("flex::bubble_inline_sizes {:x}",
|
|
self.block_flow.base.debug_id());
|
|
|
|
// Flexbox Section 9.0: Generate anonymous flex items:
|
|
// This part was handled in the flow constructor.
|
|
|
|
// Flexbox Section 9.1: Re-order flex items according to their order.
|
|
// FIXME(stshine): This should be done during flow construction.
|
|
let mut items: Vec<FlexItem> =
|
|
self.block_flow
|
|
.base
|
|
.children
|
|
.iter()
|
|
.enumerate()
|
|
.filter(|&(_, flow)| {
|
|
!flow.as_block().base.flags.contains(IS_ABSOLUTELY_POSITIONED)
|
|
})
|
|
.map(|(index, flow)| FlexItem::new(index, flow))
|
|
.collect();
|
|
|
|
items.sort_by_key(|item| item.order);
|
|
self.items = items;
|
|
|
|
match self.main_mode {
|
|
Direction::Inline => self.inline_mode_bubble_inline_sizes(),
|
|
Direction::Block => self.block_mode_bubble_inline_sizes()
|
|
}
|
|
}
|
|
|
|
fn assign_inline_sizes(&mut self, layout_context: &LayoutContext) {
|
|
let _scope = layout_debug_scope!("flex::assign_inline_sizes {:x}", self.block_flow.base.debug_id());
|
|
debug!("assign_inline_sizes");
|
|
|
|
if !self.block_flow.base.restyle_damage.intersects(REFLOW_OUT_OF_FLOW | REFLOW) {
|
|
return
|
|
}
|
|
|
|
self.block_flow.initialize_container_size_for_root(layout_context.shared_context());
|
|
|
|
// Our inline-size was set to the inline-size of the containing block by the flow's parent.
|
|
// Now compute the real value.
|
|
let containing_block_inline_size = self.block_flow.base.block_container_inline_size;
|
|
self.block_flow.compute_used_inline_size(layout_context.shared_context(),
|
|
containing_block_inline_size);
|
|
if self.block_flow.base.flags.is_float() {
|
|
self.block_flow.float.as_mut().unwrap().containing_inline_size = containing_block_inline_size
|
|
}
|
|
|
|
let (available_block_size, available_inline_size) = {
|
|
let style = &self.block_flow.fragment.style;
|
|
let (specified_block_size, specified_inline_size) = if style.writing_mode.is_vertical() {
|
|
(style.get_position().width, style.get_position().height)
|
|
} else {
|
|
(style.get_position().height, style.get_position().width)
|
|
};
|
|
|
|
let available_inline_size = AxisSize::new(specified_inline_size,
|
|
Some(self.block_flow.base.block_container_inline_size),
|
|
style.min_inline_size(),
|
|
style.max_inline_size());
|
|
|
|
let available_block_size = AxisSize::new(specified_block_size,
|
|
self.block_flow.base.block_container_explicit_block_size,
|
|
style.min_block_size(),
|
|
style.max_block_size());
|
|
(available_block_size, available_inline_size)
|
|
};
|
|
|
|
// Move in from the inline-start border edge.
|
|
let inline_start_content_edge = self.block_flow.fragment.border_box.start.i +
|
|
self.block_flow.fragment.border_padding.inline_start;
|
|
|
|
debug!("inline_start_content_edge = {:?}", inline_start_content_edge);
|
|
|
|
let padding_and_borders = self.block_flow.fragment.border_padding.inline_start_end();
|
|
|
|
// Distance from the inline-end margin edge to the inline-end content edge.
|
|
let inline_end_content_edge =
|
|
self.block_flow.fragment.margin.inline_end +
|
|
self.block_flow.fragment.border_padding.inline_end;
|
|
|
|
debug!("padding_and_borders = {:?}", padding_and_borders);
|
|
debug!("self.block_flow.fragment.border_box.size.inline = {:?}",
|
|
self.block_flow.fragment.border_box.size.inline);
|
|
let content_inline_size = self.block_flow.fragment.border_box.size.inline - padding_and_borders;
|
|
|
|
match self.main_mode {
|
|
Direction::Inline => {
|
|
self.available_main_size = available_inline_size;
|
|
self.available_cross_size = available_block_size;
|
|
self.inline_mode_assign_inline_sizes(layout_context,
|
|
inline_start_content_edge,
|
|
inline_end_content_edge,
|
|
content_inline_size)
|
|
}
|
|
Direction::Block => {
|
|
self.available_main_size = available_block_size;
|
|
self.available_cross_size = available_inline_size;
|
|
self.block_mode_assign_inline_sizes(layout_context,
|
|
inline_start_content_edge,
|
|
inline_end_content_edge,
|
|
content_inline_size)
|
|
}
|
|
}
|
|
}
|
|
|
|
fn assign_block_size(&mut self, layout_context: &LayoutContext) {
|
|
self.block_flow
|
|
.assign_block_size_block_base(layout_context,
|
|
None,
|
|
MarginsMayCollapseFlag::MarginsMayNotCollapse);
|
|
match self.main_mode {
|
|
Direction::Inline => self.inline_mode_assign_block_size(layout_context),
|
|
Direction::Block => self.block_mode_assign_block_size(),
|
|
}
|
|
}
|
|
|
|
fn compute_absolute_position(&mut self, layout_context: &LayoutContext) {
|
|
self.block_flow.compute_absolute_position(layout_context)
|
|
}
|
|
|
|
fn place_float_if_applicable<'a>(&mut self) {
|
|
self.block_flow.place_float_if_applicable()
|
|
}
|
|
|
|
fn update_late_computed_inline_position_if_necessary(&mut self, inline_position: Au) {
|
|
self.block_flow.update_late_computed_inline_position_if_necessary(inline_position)
|
|
}
|
|
|
|
fn update_late_computed_block_position_if_necessary(&mut self, block_position: Au) {
|
|
self.block_flow.update_late_computed_block_position_if_necessary(block_position)
|
|
}
|
|
|
|
fn build_display_list(&mut self, state: &mut DisplayListBuildState) {
|
|
self.build_display_list_for_flex(state);
|
|
}
|
|
|
|
fn collect_stacking_contexts(&mut self, state: &mut DisplayListBuildState) {
|
|
self.block_flow.collect_stacking_contexts(state);
|
|
}
|
|
|
|
fn repair_style(&mut self, new_style: &::ServoArc<ComputedValues>) {
|
|
self.block_flow.repair_style(new_style)
|
|
}
|
|
|
|
fn compute_overflow(&self) -> Overflow {
|
|
self.block_flow.compute_overflow()
|
|
}
|
|
|
|
fn generated_containing_block_size(&self, flow: OpaqueFlow) -> LogicalSize<Au> {
|
|
self.block_flow.generated_containing_block_size(flow)
|
|
}
|
|
|
|
fn iterate_through_fragment_border_boxes(&self,
|
|
iterator: &mut FragmentBorderBoxIterator,
|
|
level: i32,
|
|
stacking_context_position: &Point2D<Au>) {
|
|
self.block_flow.iterate_through_fragment_border_boxes(iterator, level, stacking_context_position);
|
|
}
|
|
|
|
fn mutate_fragments(&mut self, mutator: &mut FnMut(&mut Fragment)) {
|
|
self.block_flow.mutate_fragments(mutator);
|
|
}
|
|
}
|