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use super::*;
/// The flex layouter first arranges boxes along a primary and if necessary also
/// along a secondary axis.
#[derive(Debug, Clone)]
pub struct FlexLayouter {
axes: LayoutAxes,
flex_spacing: Size,
stack: StackLayouter,
units: Vec<FlexUnit>,
line: FlexLine,
part: PartialLine,
}
#[derive(Debug, Clone)]
enum FlexUnit {
Boxed(Layout),
Space(Size, SpacingKind),
SetAxes(LayoutAxes),
Break,
}
#[derive(Debug, Clone)]
struct FlexLine {
usable: Size,
actions: LayoutActions,
combined_dimensions: Size2D,
}
impl FlexLine {
fn new(usable: Size) -> FlexLine {
FlexLine {
usable,
actions: LayoutActions::new(),
combined_dimensions: Size2D::ZERO,
}
}
}
#[derive(Debug, Clone)]
struct PartialLine {
usable: Size,
content: Vec<(Size, Layout)>,
dimensions: Size2D,
space: LastSpacing,
}
impl PartialLine {
fn new(usable: Size) -> PartialLine {
PartialLine {
usable,
content: vec![],
dimensions: Size2D::ZERO,
space: LastSpacing::Hard,
}
}
}
/// The context for flex layouting.
///
/// See [`LayoutContext`] for details about the fields.
#[derive(Debug, Clone)]
pub struct FlexContext {
pub spaces: LayoutSpaces,
pub axes: LayoutAxes,
pub alignment: LayoutAlignment,
pub flex_spacing: Size,
pub debug: bool,
}
impl FlexLayouter {
/// Create a new flex layouter.
pub fn new(ctx: FlexContext) -> FlexLayouter {
let stack = StackLayouter::new(StackContext {
spaces: ctx.spaces,
axes: ctx.axes,
alignment: ctx.alignment,
debug: ctx.debug,
});
let usable = stack.primary_usable();
FlexLayouter {
axes: ctx.axes,
flex_spacing: ctx.flex_spacing,
stack,
units: vec![],
line: FlexLine::new(usable),
part: PartialLine::new(usable),
}
}
pub fn add(&mut self, layout: Layout) {
self.units.push(FlexUnit::Boxed(layout));
}
pub fn add_multiple(&mut self, layouts: MultiLayout) {
for layout in layouts {
self.add(layout);
}
}
pub fn add_break(&mut self) {
self.units.push(FlexUnit::Break);
}
pub fn add_primary_space(&mut self, space: Size, kind: SpacingKind) {
self.units.push(FlexUnit::Space(space, kind))
}
pub fn add_secondary_space(&mut self, space: Size, kind: SpacingKind) -> LayoutResult<()> {
if !self.run_is_empty() {
self.finish_run()?;
}
Ok(self.stack.add_spacing(space, kind))
}
pub fn set_axes(&mut self, axes: LayoutAxes) {
self.units.push(FlexUnit::SetAxes(axes));
}
pub fn set_spaces(&mut self, spaces: LayoutSpaces, replace_empty: bool) {
if replace_empty && self.run_is_empty() && self.stack.space_is_empty() {
self.stack.set_spaces(spaces, true);
self.start_line();
} else {
self.stack.set_spaces(spaces, false);
}
}
pub fn remaining(&self) -> LayoutSpaces {
self.stack.remaining()
}
pub fn run_is_empty(&self) -> bool {
!self.units.iter().any(|unit| matches!(unit, FlexUnit::Boxed(_)))
}
pub fn run_last_is_space(&self) -> bool {
matches!(self.units.last(), Some(FlexUnit::Space(_, _)))
}
pub fn finish(mut self) -> LayoutResult<MultiLayout> {
self.finish_space(false)?;
Ok(self.stack.finish())
}
pub fn finish_space(&mut self, hard: bool) -> LayoutResult<()> {
if !self.run_is_empty() {
self.finish_run()?;
}
self.stack.finish_space(hard);
Ok(self.start_line())
}
pub fn finish_run(&mut self) -> LayoutResult<Size2D> {
let units = std::mem::replace(&mut self.units, vec![]);
for unit in units {
match unit {
FlexUnit::Boxed(boxed) => self.layout_box(boxed)?,
FlexUnit::Space(space, kind) => self.layout_space(space, kind),
FlexUnit::SetAxes(axes) => self.layout_set_axes(axes),
FlexUnit::Break => { self.finish_line()?; },
}
}
self.finish_line()
}
fn finish_line(&mut self) -> LayoutResult<Size2D> {
unimplemented!()
}
fn start_line(&mut self) {
unimplemented!()
}
fn finish_partial_line(&mut self) {
unimplemented!()
}
fn layout_box(&mut self, _boxed: Layout) -> LayoutResult<()> {
unimplemented!()
}
fn layout_space(&mut self, _space: Size, _kind: SpacingKind) {
unimplemented!()
}
fn layout_set_axes(&mut self, _axes: LayoutAxes) {
unimplemented!()
}
}
|
