hydrolysis 0.3.1

GPU-required self-drawn backend for WaterUI
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use nami::Computed;
use waterui_core::Environment;
use waterui_core::interaction::Disabled;

/// The disabled state in force at this point in the view tree.
///
/// Disabled is a scoped environment attribute installed by `.disabled(...)`,
/// not a field on any control's configuration: a control reads the state at its
/// own position, exactly the way it reads the widget theme. Reads `false` when
/// no enclosing scope disables the subtree.
pub(crate) fn widget_disabled(env: &Environment) -> Computed<bool> {
    env.get::<Disabled>()
        .map_or_else(|| Computed::constant(false), |scope| scope.signal().clone())
}

pub(crate) fn inset_rect(rect: vello::kurbo::Rect, dx: f64, dy: f64) -> vello::kurbo::Rect {
    vello::kurbo::Rect::new(
        rect.x0 + dx,
        rect.y0 + dy,
        (rect.x1 - dx).max(rect.x0 + dx),
        (rect.y1 - dy).max(rect.y0 + dy),
    )
}

/// The rect for a label that sits beside its control on a row — a toggle's
/// label next to its switch or checkbox, a stepper's label next to its
/// buttons. The label keeps the horizontal extent the widget picked for it,
/// but vertically it takes its own height (capped to `row`) centred on the
/// control's centre line: a single-line label shares the control's centre
/// instead of riding the row's top edge.
pub(crate) fn label_beside_control_bounds(
    x0: f64,
    x1: f64,
    row: vello::kurbo::Rect,
    control: vello::kurbo::Rect,
    label_height: f64,
) -> vello::kurbo::Rect {
    let height = label_height.min(row.height());
    let y0 = (control.y0 + control.y1 - height) * 0.5;
    vello::kurbo::Rect::new(x0, y0, x1, y0 + height)
}