guise-ui 1.5.2

A component library for gpui, Zed's GPU-accelerated UI framework: a themed palette, sizing tokens, 130+ composable components, a reactive state layer, and an in-app Safari-style inspector.
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//! Focus navigation between panes: directional (via layout rects) and ordinal.

use super::id::PaneId;
use super::layout::{Layout, Rect};
use super::tree::PaneTree;

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum Direction {
  Up,
  Down,
  Left,
  Right,
}

const EPS: f32 = 0.001;

/// The pane reached by moving `direction` from `from`: the pane whose facing
/// edge is closest (adjoining wins) and whose center is nearest on the
/// perpendicular axis. `None` at the workspace edge or if `from` is unknown.
pub fn neighbor(layout: &Layout, from: PaneId, direction: Direction) -> Option<PaneId> {
  let origin = layout.pane_rect(from)?;
  let mut best: Option<(f32, f32, PaneId)> = None;
  for (pane, rect) in &layout.panes {
    if *pane == from {
      continue;
    }
    let Some(gap) = edgegap(origin, *rect, direction) else {
      continue;
    };
    let dist = centerdistance(origin, *rect, direction);
    let closer = match best {
      None => true,
      Some((bgap, bdist, _)) => gap < bgap - EPS || ((gap - bgap).abs() <= EPS && dist < bdist),
    };
    if closer {
      best = Some((gap, dist, *pane));
    }
  }
  best.map(|(_, _, pane)| pane)
}

/// Next pane after `from` in layout order, wrapping.
pub fn next(tree: &PaneTree, from: PaneId) -> Option<PaneId> {
  let panes = tree.panes();
  let i = panes.iter().position(|p| *p == from)?;
  Some(panes[(i + 1) % panes.len()])
}

/// Previous pane before `from` in layout order, wrapping.
pub fn prev(tree: &PaneTree, from: PaneId) -> Option<PaneId> {
  let panes = tree.panes();
  let i = panes.iter().position(|p| *p == from)?;
  Some(panes[(i + panes.len() - 1) % panes.len()])
}

/// Distance from `from`'s facing edge to `to`'s opposing edge, or `None`
/// if `to` is not on the `dir` side of `from`.
fn edgegap(from: Rect, to: Rect, dir: Direction) -> Option<f32> {
  let gap = match dir {
    Direction::Left => from.x - (to.x + to.w),
    Direction::Right => to.x - (from.x + from.w),
    Direction::Up => from.y - (to.y + to.h),
    Direction::Down => to.y - (from.y + from.h),
  };
  (gap >= -EPS).then(|| gap.max(0.0))
}

fn centerdistance(from: Rect, to: Rect, dir: Direction) -> f32 {
  let (fx, fy) = from.center();
  let (tx, ty) = to.center();
  match dir {
    Direction::Left | Direction::Right => (fy - ty).abs(),
    Direction::Up | Direction::Down => (fx - tx).abs(),
  }
}