Enum PaneNode 

pub enum PaneNode {
    Leaf(usize),
    HorizontalSplit {
        top: Box<PaneNode>,
        bottom: Box<PaneNode>,
        ratio: f32,
    },
    VerticalSplit {
        left: Box<PaneNode>,
        right: Box<PaneNode>,
        ratio: f32,
    },
}

Internal node of the pane tree. Leaves reference a PaneState by index in PaneTree::leaves; splits hold two children with an explicit orientation and a ratio. New splits start at DEFAULT_SPLIT_RATIO; PaneTree::resize_active_split and PaneTree::equalize_ratios adjust them.

Variants

Leaf(usize)

A concrete pane. The usize indexes into PaneTree::leaves.

HorizontalSplit

Two panes stacked top + bottom (a horizontal cut). ratio is the top child’s share of the total height, clamped to MIN_SPLIT_RATIO..=MAX_SPLIT_RATIO. Default 0.5 = even split. Issue #28 (2026-05-22): <C-w>= resets every ratio to 0.5; <C-w>+ / <C-w>- nudge the nearest HorizontalSplit ancestor’s ratio.

Fields

top: Box<PaneNode>

The upper child.

bottom: Box<PaneNode>

The lower child.

ratio: f32

top’s share of the height, in 0.0..=1.0.

VerticalSplit

Two panes side by side left + right (a vertical cut). ratio is the left child’s share of the total width. <C-w>> / <C-w>< nudge the nearest VerticalSplit ancestor’s ratio.

Fields

left: Box<PaneNode>

The left child.

right: Box<PaneNode>

The right child.

ratio: f32

left’s share of the width, in 0.0..=1.0.

Implementations

impl PaneNode

pub fn leaf(idx: usize) -> Self

Leaf-only constructor used at App init when there’s exactly one pane.

pub fn is_single_leaf(&self) -> bool

True for the trivial single-leaf tree.

pub fn for_each_leaf(&self, visit: &mut impl FnMut(usize))

Walk the tree depth-first and call visit on every leaf index, in left-to-right / top-to-bottom order.

Trait Implementations

impl Clone for PaneNode

fn clone(&self) -> PaneNode

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for PaneNode

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for PaneNode

Manual Default (tuple variants can’t use #[default]). Default = Leaf(0), matching the PaneTree::single shape for the trivial one-pane tree.

fn default() -> Self

Returns the “default value” for a type.