1 files changed, 144 insertions, 0 deletions
diff --git a/components/script/dom/xrinputsourcearray.rs b/components/script/dom/xrinputsourcearray.rs
new file mode 100644
index 00000000000..b26f7bd3da7
--- /dev/null
+++ b/components/script/dom/xrinputsourcearray.rs
@@ -0,0 +1,144 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use crate::dom::bindings::cell::DomRefCell;
+use crate::dom::bindings::codegen::Bindings::XRInputSourceArrayBinding::XRInputSourceArrayMethods;
+use crate::dom::bindings::inheritance::Castable;
+use crate::dom::bindings::reflector::{reflect_dom_object, DomObject, Reflector};
+use crate::dom::bindings::root::{Dom, DomRoot};
+use crate::dom::event::Event;
+use crate::dom::globalscope::GlobalScope;
+use crate::dom::xrinputsource::XRInputSource;
+use crate::dom::xrinputsourceschangeevent::XRInputSourcesChangeEvent;
+use crate::dom::xrsession::XRSession;
+use dom_struct::dom_struct;
+use webxr_api::{InputId, InputSource};
+
+#[dom_struct]
+pub struct XRInputSourceArray {
+    reflector_: Reflector,
+    input_sources: DomRefCell<Vec<Dom<XRInputSource>>>,
+}
+
+impl XRInputSourceArray {
+    fn new_inherited() -> XRInputSourceArray {
+        XRInputSourceArray {
+            reflector_: Reflector::new(),
+            input_sources: DomRefCell::new(vec![]),
+        }
+    }
+
+    pub fn new(global: &GlobalScope) -> DomRoot<XRInputSourceArray> {
+        reflect_dom_object(Box::new(XRInputSourceArray::new_inherited()), global)
+    }
+
+    pub fn add_input_sources(&self, session: &XRSession, inputs: &[InputSource]) {
+        let mut input_sources = self.input_sources.borrow_mut();
+        let global = self.global();
+
+        let mut added = vec![];
+        for info in inputs {
+            // This is quadratic, but won't be a problem for the only case
+            // where we add multiple input sources (the initial input sources case)
+            debug_assert!(
+                input_sources.iter().find(|i| i.id() == info.id).is_none(),
+                "Should never add a duplicate input id!"
+            );
+            let input = XRInputSource::new(&global, &session, info.clone());
+            input_sources.push(Dom::from_ref(&input));
+            added.push(input);
+        }
+
+        let event = XRInputSourcesChangeEvent::new(
+            &global,
+            atom!("inputsourceschange"),
+            false,
+            true,
+            session,
+            &added,
+            &[],
+        );
+        // Release the refcell guard
+        drop(input_sources);
+        event.upcast::<Event>().fire(session.upcast());
+    }
+
+    pub fn remove_input_source(&self, session: &XRSession, id: InputId) {
+        let mut input_sources = self.input_sources.borrow_mut();
+        let global = self.global();
+        let removed = if let Some(i) = input_sources.iter().find(|i| i.id() == id) {
+            [DomRoot::from_ref(&**i)]
+        } else {
+            return;
+        };
+
+        let event = XRInputSourcesChangeEvent::new(
+            &global,
+            atom!("inputsourceschange"),
+            false,
+            true,
+            session,
+            &[],
+            &removed,
+        );
+        input_sources.retain(|i| i.id() != id);
+        // release the refcell guard
+        drop(input_sources);
+        event.upcast::<Event>().fire(session.upcast());
+    }
+
+    pub fn add_remove_input_source(&self, session: &XRSession, id: InputId, info: InputSource) {
+        let mut input_sources = self.input_sources.borrow_mut();
+        let global = self.global();
+        let root;
+        let removed = if let Some(i) = input_sources.iter().find(|i| i.id() == id) {
+            root = [DomRoot::from_ref(&**i)];
+            &root as &[_]
+        } else {
+            warn!("Could not find removed input source with id {:?}", id);
+            &[]
+        };
+        input_sources.retain(|i| i.id() != id);
+        let input = XRInputSource::new(&global, &session, info);
+        input_sources.push(Dom::from_ref(&input));
+
+        let added = [input];
+
+        let event = XRInputSourcesChangeEvent::new(
+            &global,
+            atom!("inputsourceschange"),
+            false,
+            true,
+            session,
+            &added,
+            removed,
+        );
+        // release the refcell guard
+        drop(input_sources);
+        event.upcast::<Event>().fire(session.upcast());
+    }
+
+    pub fn find(&self, id: InputId) -> Option<DomRoot<XRInputSource>> {
+        self.input_sources
+            .borrow()
+            .iter()
+            .find(|x| x.id() == id)
+            .map(|x| DomRoot::from_ref(&**x))
+    }
+}
+
+impl XRInputSourceArrayMethods for XRInputSourceArray {
+    /// https://immersive-web.github.io/webxr/#dom-xrinputsourcearray-length
+    fn Length(&self) -> u32 {
+        self.input_sources.borrow().len() as u32
+    }
+
+    /// https://immersive-web.github.io/webxr/#xrinputsourcearray
+    fn IndexedGetter(&self, n: u32) -> Option<DomRoot<XRInputSource>> {
+        self.input_sources
+            .borrow()
+            .get(n as usize)
+            .map(|x| DomRoot::from_ref(&**x))
+    }
+}