cranpose-ui 0.1.164

UI primitives for Cranpose
Documentation 
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use std::cell::Cell;

use cranpose_core::{Composition, MemoryApplier, MutableState, location_key};

use super::*;

#[test]
fn layout_recomposes_when_content_reads_state() {
    let _app_context = crate::render_state::app_context_test_scope();
    thread_local! {
        static INVOCATIONS: Cell<usize> = const { Cell::new(0) };
    }

    let mut composition = Composition::new(MemoryApplier::new());
    let runtime = composition.runtime_handle();
    let state = MutableState::with_runtime(0_i32, runtime);

    composition
        .render(location_key(file!(), line!(), column!()), {
            let observed_state = state;
            move || {
                Layout(
                    Modifier::empty(),
                    crate::layout::policies::EmptyMeasurePolicy,
                    {
                        let observed_state = observed_state;
                        move || {
                            let _ = observed_state.value();
                            INVOCATIONS.with(|calls| calls.set(calls.get() + 1));
                        }
                    },
                );
            }
        })
        .expect("initial layout render");

    INVOCATIONS.with(|calls| assert_eq!(calls.get(), 1));

    state.set_value(1);
    composition
        .process_invalid_scopes()
        .expect("layout content recomposition");

    INVOCATIONS.with(|calls| assert_eq!(calls.get(), 2));
}

#[test]
fn subcompose_missing_policy_cell_measures_empty_layout() {
    let result = empty_subcompose_measure_result(Constraints {
        min_width: 12.0,
        max_width: 120.0,
        min_height: 8.0,
        max_height: 90.0,
    });

    assert_eq!(result.size.width, 12.0);
    assert_eq!(result.size.height, 8.0);
    assert!(result.placements.is_empty());
}