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use vec::ToVec2;
/// Describe constraints on a view layout in one dimension.
#[derive(PartialEq,Clone,Copy)]
pub enum DimensionRequest {
/// The view must use exactly the attached size.
Fixed(usize),
/// The view is free to choose its size if it stays under the limit.
AtMost(usize),
/// No clear restriction apply.
Unknown,
}
impl DimensionRequest {
/// Returns a new request, reduced from the original by the given offset.
pub fn reduced(self, offset: usize) -> Self {
match self {
DimensionRequest::Fixed(w) => DimensionRequest::Fixed(w - offset),
DimensionRequest::AtMost(w) => DimensionRequest::AtMost(w - offset),
DimensionRequest::Unknown => DimensionRequest::Unknown,
}
}
}
/// Describes constraints on a view layout.
#[derive(PartialEq,Clone,Copy)]
pub struct SizeRequest {
/// Restriction on the view width
pub w: DimensionRequest,
/// Restriction on the view height
pub h: DimensionRequest,
}
impl SizeRequest {
/// Returns a new SizeRequest, reduced from the original by the given offset.
pub fn reduced<T: ToVec2>(self, offset: T) -> Self {
let ov = offset.to_vec2();
SizeRequest {
w: self.w.reduced(ov.x),
h: self.h.reduced(ov.y),
}
}
/// Creates a new dummy request, with no restriction.
pub fn dummy() -> Self {
SizeRequest {
w: DimensionRequest::Unknown,
h: DimensionRequest::Unknown,
}
}
}