windows-composition 0.100.0

Windows composition library
Documentation 
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use super::*;

/// A composition target that hosts a visual tree inside a window.
///
/// Created by
/// [`Compositor::create_desktop_window_target`](crate::Compositor::create_desktop_window_target).
/// Assign the tree's root with [`set_root`](Self::set_root); the target renders
/// its root for as long as it is kept alive.
pub struct DesktopWindowTarget(bindings::CompositionTarget);

impl DesktopWindowTarget {
    pub(crate) fn new(target: bindings::IDesktopWindowTarget) -> Self {
        Self(target.cast().unwrap())
    }

    /// Sets the root visual displayed by the target.
    pub fn set_root(&self, visual: &Visual) {
        self.0.SetRoot(&visual.0).unwrap();
    }

    /// Returns the target's current root visual, if any has been set.
    pub fn root(&self) -> Option<Visual> {
        // Before `set_root`, the WinRT getter yields a null reference (surfaced
        // as an error), which maps to `None` rather than a panic.
        self.0.Root().ok().map(Visual)
    }
}