ferroui-base 0.1.0-preview.2

The base library of FerroUI: the property system, layout, input, styling, media, text, animation, data binding and the compositor
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use super::CompositionVisual;
use crate::Visual;
use std::rc::Rc;

/// Access to the composition visuals of the visuals of the visual tree.
pub struct ElementComposition;

impl ElementComposition {
    /// Gets the composition visual of a visual; `None` while the visual is
    /// not attached to a compositor.
    pub fn get_element_visual(visual: &Visual) -> Option<Rc<CompositionVisual>> {
        visual.composition_visual().map(|v| (*v).clone())
    }

    /// Sets a composition visual that is shown as the last child of the
    /// composition visual of `visual`.
    pub fn set_element_child_visual(visual: &Visual, composition_visual: Option<Rc<CompositionVisual>>) {
        if let (Some(child), Some(own)) = (&composition_visual, visual.composition_visual()) {
            if !Rc::ptr_eq(child.compositor(), own.compositor()) {
                panic!("Composition visuals belong to different compositor instances");
            }
        }

        visual.set_child_composition_visual(composition_visual);
        if let Some(source) = visual.presentation_source() {
            source.renderer().recalculate_children(visual);
        }
    }

    /// Gets the composition visual set with
    /// [`set_element_child_visual`](Self::set_element_child_visual).
    pub fn get_element_child_visual(visual: &Visual) -> Option<Rc<CompositionVisual>> {
        visual.child_composition_visual()
    }
}