egui_dock 0.21.1

Docking system for egui - an immediate-mode GUI library for Rust
Documentation 
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/// Wrapper around indices to the collection of Surfaces inside a [`DockState`](crate::DockState).
#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, Hash)]
#[cfg_attr(
    feature = "serde",
    derive(serde::Deserialize, serde::Serialize),
    serde(default)
)]
pub struct SurfaceIndex(pub usize);

impl From<usize> for SurfaceIndex {
    #[inline(always)]
    fn from(index: usize) -> Self {
        SurfaceIndex(index)
    }
}

impl SurfaceIndex {
    /// Returns the index of the main surface.
    #[inline(always)]
    pub const fn main() -> Self {
        Self(0)
    }

    /// Returns if this index is `SurfaceIndex::main()`.
    #[inline(always)]
    pub const fn is_main(self) -> bool {
        self.0 == Self::main().0
    }
}