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Add flags 'is_wrappable' and 'cross_reverse'

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These 'is_wrappable' flag can be used to determine if a flex flow can be
multi-line. The 'is_reverse' flag is replaced by 'main_reverse' and
'cross_reverse' since flex flow can go reverse individually in main and
cross direction.
This commit is contained in:
Pu Xingyu 2016-07-20 16:11:48 +08:00
parent 5da880e2c2
commit bf5805f2a6
1 changed files with 37 additions and 12 deletions
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49
components/layout/flex.rs
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@ -27,6 +27,7 @@ use std::cmp::{max, min};
use std::sync::Arc;
use style::computed_values::flex_direction;
use style::computed_values::{box_sizing, border_collapse};
use style::computed_values::flex_wrap;
use style::context::SharedStyleContext;
use style::logical_geometry::LogicalSize;
use style::properties::ServoComputedValues;
@ -276,19 +277,41 @@ pub struct FlexFlow {
/// List of flex-items that belong to this flex-container
items: Vec<FlexItem>,
/// True if the flex-direction is *-reversed
is_reverse: bool
main_reverse: bool,
/// True if this flex container can be multiline.
is_wrappable: bool,
/// True if the cross direction is reversed.
cross_reverse: bool
}
impl FlexFlow {
pub fn from_fragment(fragment: Fragment,
flotation: Option<FloatKind>)
-> FlexFlow {
let (main_mode, is_reverse) = match fragment.style.get_position().flex_direction {
flex_direction::T::row => (Mode::Inline, false),
flex_direction::T::row_reverse => (Mode::Inline, true),
flex_direction::T::column => (Mode::Block, false),
flex_direction::T::column_reverse => (Mode::Block, true),
};
let main_mode;
let main_reverse;
let is_wrappable;
let cross_reverse;
{
let style = fragment.style();
let (mode, reverse) = match style.get_position().flex_direction {
flex_direction::T::row => (Mode::Inline, false),
flex_direction::T::row_reverse => (Mode::Inline, true),
flex_direction::T::column => (Mode::Block, false),
flex_direction::T::column_reverse => (Mode::Block, true),
};
main_mode = mode;
main_reverse =
reverse == style.writing_mode.is_bidi_ltr();
let (wrappable, reverse) = match fragment.style.get_position().flex_wrap {
flex_wrap::T::nowrap => (false, false),
flex_wrap::T::wrap => (true, false),
flex_wrap::T::wrap_reverse => (true, true),
};
is_wrappable = wrappable;
// TODO(stshine): Handle vertical writing mode.
cross_reverse = reverse;
}
FlexFlow {
block_flow: BlockFlow::from_fragment(fragment, flotation),
@ -296,7 +319,9 @@ impl FlexFlow {
available_main_size: AxisSize::Infinite,
available_cross_size: AxisSize::Infinite,
items: Vec::new(),
is_reverse: is_reverse
main_reverse: main_reverse,
is_wrappable: is_wrappable,
cross_reverse: cross_reverse
}
}
@ -430,7 +455,7 @@ impl FlexFlow {
self.block_flow.base.position.size.inline = inline_size;
let block_container_explicit_block_size = self.block_flow.base.block_container_explicit_block_size;
let mut inline_child_start = if !self.is_reverse {
let mut inline_child_start = if !self.main_reverse {
inline_start_content_edge
} else {
self.block_flow.fragment.border_box.size.inline
@ -441,7 +466,7 @@ impl FlexFlow {
base.block_container_inline_size = even_content_inline_size;
base.block_container_writing_mode = container_mode;
base.block_container_explicit_block_size = block_container_explicit_block_size;
if !self.is_reverse {
if !self.main_reverse {
base.position.start.i = inline_child_start;
inline_child_start = inline_child_start + even_content_inline_size;
} else {
@ -453,14 +478,14 @@ impl FlexFlow {
// TODO(zentner): This function should actually flex elements!
fn block_mode_assign_block_size<'a>(&mut self, layout_context: &'a LayoutContext<'a>) {
let mut cur_b = if !self.is_reverse {
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
};
for kid in &mut self.items {
let base = flow::mut_base(flow_ref::deref_mut(&mut kid.flow));
if !self.is_reverse {
if !self.main_reverse {
base.position.start.b = cur_b;
cur_b = cur_b + base.position.size.block;
} else {