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use crate::prelude::*;
/// A partial layout result.
#[derive(Clone)]
pub struct Fragment(Vec<Frame>);
impl Fragment {
/// Create a fragment from a single frame.
pub fn frame(frame: Frame) -> Self {
Self(vec![frame])
}
/// Create a fragment from multiple frames.
pub fn frames(frames: Vec<Frame>) -> Self {
Self(frames)
}
/// Return `true` if the length is 0.
pub fn is_empty(&self) -> bool {
self.0.is_empty()
}
/// The number of frames in the fragment.
pub fn len(&self) -> usize {
self.0.len()
}
/// Extract the first and only frame.
///
/// Panics if there are multiple frames.
#[track_caller]
pub fn into_frame(self) -> Frame {
assert_eq!(self.0.len(), 1, "expected exactly one frame");
self.0.into_iter().next().unwrap()
}
/// Extract the frames.
pub fn into_frames(self) -> Vec<Frame> {
self.0
}
/// Iterate over the contained frames.
pub fn iter(&self) -> std::slice::Iter<Frame> {
self.0.iter()
}
/// Iterate over the contained frames.
pub fn iter_mut(&mut self) -> std::slice::IterMut<Frame> {
self.0.iter_mut()
}
}
impl Debug for Fragment {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
match self.0.as_slice() {
[frame] => frame.fmt(f),
frames => frames.fmt(f),
}
}
}
impl IntoIterator for Fragment {
type Item = Frame;
type IntoIter = std::vec::IntoIter<Frame>;
fn into_iter(self) -> Self::IntoIter {
self.0.into_iter()
}
}
impl<'a> IntoIterator for &'a Fragment {
type Item = &'a Frame;
type IntoIter = std::slice::Iter<'a, Frame>;
fn into_iter(self) -> Self::IntoIter {
self.0.iter()
}
}
impl<'a> IntoIterator for &'a mut Fragment {
type Item = &'a mut Frame;
type IntoIter = std::slice::IterMut<'a, Frame>;
fn into_iter(self) -> Self::IntoIter {
self.0.iter_mut()
}
}
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