quadraui 0.6.1

Cross-platform Rust UI toolkit: write one AppLogic and run it unmodified on TUI, GTK4 (Linux), macOS, and Windows backends
Documentation 
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//! GTK rasteriser for [`crate::SplitTree`].
//!
//! Painting is implemented in the shared
//! [`crate::primitives::split_tree::native_surface_paint::paint`].
//! This module provides [`gtk_split_tree_layout`]; it shares divider
//! thickness with `mac_split_tree_layout` / `win_split_tree_layout`

use crate::event::Rect;
use crate::primitives::layout_metrics::pixel_split_tree_layout;
use crate::primitives::split_tree::{SplitTree, SplitTreeLayout};

/// Compute the GTK pixel-unit layout for a [`SplitTree`] without
/// painting. Shares its divider thickness with `mac_split_tree_layout` /
/// `win_split_tree_layout` via [`pixel_split_tree_layout`].
pub fn gtk_split_tree_layout(tree: &SplitTree, x: f64, y: f64, w: f64, h: f64) -> SplitTreeLayout {
    let bounds = Rect::new(x as f32, y as f32, w as f32, h as f32);
    pixel_split_tree_layout(tree, bounds)
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::event::Point;
    use crate::primitives::split_tree::SplitDirection;
    use crate::types::WidgetId;

    fn wid(s: &str) -> WidgetId {
        WidgetId::new(s)
    }

    /// `split_tree_layout` is documented **ABSOLUTE**:
    /// leaf/divider bounds are shifted by the origin, so `(x, y) = (0, 0)`
    /// is exactly the case where a LOCAL/ABSOLUTE mixup is invisible.
    fn round_trip_at(x: f64, y: f64) {
        let tree = SplitTree::split(
            SplitDirection::Horizontal,
            0.5,
            SplitTree::leaf(wid("a")),
            SplitTree::leaf(wid("b")),
        );
        let layout = gtk_split_tree_layout(&tree, x, y, 100.0, 40.0);

        assert_eq!(
            layout.leaves[0].1.x as f64, x,
            "first leaf must start at the split's own x"
        );
        assert_eq!(
            layout.leaves[0].1.y as f64, y,
            "first leaf must start at the split's own y"
        );

        let d = &layout.dividers[0];
        let cross_mid = y as f32 + 20.0;
        assert_eq!(
            layout.hit_test_divider(
                Point {
                    x: d.position,
                    y: cross_mid
                },
                1.0
            ),
            Some(d.split_index)
        );
        assert_eq!(
            layout.hit_test_leaf(Point {
                x: x as f32 + 1.0,
                y: cross_mid
            }),
            Some(&wid("a"))
        );
        assert_eq!(
            layout.hit_test_leaf(Point {
                x: d.position + 10.0,
                y: cross_mid
            }),
            Some(&wid("b"))
        );
    }

    #[test]
    fn paint_and_click_round_trip() {
        round_trip_at(0.0, 0.0);
    }

    /// Regression guard: layout must work at non-zero origins.
    #[test]
    fn paint_and_click_round_trip_at_nonzero_origin() {
        round_trip_at(7.0, 13.0);
    }

    #[test]
    fn layout_matches_split_layout_semantics() {
        let tree = SplitTree::split(
            SplitDirection::Horizontal,
            0.5,
            SplitTree::leaf(wid("a")),
            SplitTree::leaf(wid("b")),
        );
        let layout = gtk_split_tree_layout(&tree, 0.0, 0.0, 100.0, 50.0);
        assert_eq!(layout.leaves.len(), 2);
        assert_eq!(layout.dividers.len(), 1);
        assert_eq!(
            layout.dividers[0].thickness,
            crate::primitives::layout_metrics::pixel::DIVIDER
        );
        // available = 96, 0.5*96 = 48.
        assert!((layout.dividers[0].position - 48.0).abs() < 0.001);
    }

    #[test]
    fn nested_tree_produces_all_dividers() {
        let tree = SplitTree::split(
            SplitDirection::Horizontal,
            0.5,
            SplitTree::split(
                SplitDirection::Vertical,
                0.5,
                SplitTree::leaf(wid("a")),
                SplitTree::leaf(wid("c")),
            ),
            SplitTree::leaf(wid("b")),
        );
        let layout = gtk_split_tree_layout(&tree, 0.0, 0.0, 400.0, 300.0);
        assert_eq!(layout.leaves.len(), 3);
        assert_eq!(layout.dividers.len(), 2);
        assert_eq!(layout.dividers[0].split_index, 0);
        assert_eq!(layout.dividers[1].split_index, 1);
    }
}