85 lines
3 KiB
Rust
85 lines
3 KiB
Rust
/// Size hint for table column/grid cell
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#[derive(Clone, Debug)]
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pub enum Size {
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/// Absolute size in points
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Absolute(f32),
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/// Relative size relative to all available space. Values must be in range `0.0..=1.0`
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Relative(f32),
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/// [`Size::Relative`] with a minimum size in points
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RelativeMinimum {
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/// Relative size relative to all available space. Values must be in range `0.0..=1.0`
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relative: f32,
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/// Absolute minimum size in points
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minimum: f32,
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},
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/// Multiple remainders each get the same space
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Remainder,
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/// [`Size::Remainder`] with a minimum size in points
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RemainderMinimum(f32),
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}
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pub struct Sizing {
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sizes: Vec<Size>,
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}
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impl Sizing {
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pub fn new() -> Self {
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Self { sizes: vec![] }
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}
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pub fn add_size(&mut self, size: Size) {
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self.sizes.push(size);
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}
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pub fn into_lengths(self, length: f32, inner_padding: f32) -> Vec<f32> {
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let mut remainders = 0;
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let sum_non_remainder = self
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.sizes
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.iter()
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.map(|size| match size {
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Size::Absolute(absolute) => *absolute,
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Size::Relative(relative) => {
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assert!(*relative > 0.0, "Below 0.0 is not allowed.");
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assert!(*relative <= 1.0, "Above 1.0 is not allowed.");
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length * relative
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}
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Size::RelativeMinimum { relative, minimum } => {
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assert!(*relative > 0.0, "Below 0.0 is not allowed.");
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assert!(*relative <= 1.0, "Above 1.0 is not allowed.");
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minimum.max(length * relative)
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}
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Size::Remainder | Size::RemainderMinimum(..) => {
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remainders += 1;
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0.0
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}
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})
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.sum::<f32>()
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+ inner_padding * (self.sizes.len() + 1) as f32;
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let avg_remainder_length = if remainders == 0 {
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0.0
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} else {
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let mut remainder_length = length - sum_non_remainder;
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let avg_remainder_length = 0.0f32.max(remainder_length / remainders as f32).floor();
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self.sizes.iter().for_each(|size| {
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if let Size::RemainderMinimum(minimum) = size {
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if *minimum > avg_remainder_length {
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remainder_length -= minimum - avg_remainder_length;
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}
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}
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});
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0.0f32.max(remainder_length / remainders as f32)
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};
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self.sizes
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.into_iter()
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.map(|size| match size {
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Size::Absolute(absolute) => absolute,
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Size::Relative(relative) => length * relative,
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Size::RelativeMinimum { relative, minimum } => minimum.max(length * relative),
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Size::Remainder => avg_remainder_length,
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Size::RemainderMinimum(minimum) => minimum.max(avg_remainder_length),
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})
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.collect()
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}
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}
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