1 files changed, 88 insertions, 0 deletions
diff --git a/components/script/dom/xrhand.rs b/components/script/dom/xrhand.rs
new file mode 100644
index 00000000000..a7457526242
--- /dev/null
+++ b/components/script/dom/xrhand.rs
@@ -0,0 +1,88 @@
+/* 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::codegen::Bindings::XRHandBinding::{XRHandConstants, XRHandMethods};
+use crate::dom::bindings::reflector::{reflect_dom_object, Reflector};
+use crate::dom::bindings::root::{Dom, DomRoot};
+use crate::dom::globalscope::GlobalScope;
+use crate::dom::xrinputsource::XRInputSource;
+use crate::dom::xrjointspace::XRJointSpace;
+use dom_struct::dom_struct;
+use webxr_api::{FingerJoint, Hand, Joint};
+
+#[dom_struct]
+pub struct XRHand {
+    reflector_: Reflector,
+    #[ignore_malloc_size_of = "defined in webxr"]
+    source: Dom<XRInputSource>,
+    #[ignore_malloc_size_of = "partially defind in webxr"]
+    spaces: Hand<Dom<XRJointSpace>>,
+}
+
+impl XRHand {
+    fn new_inherited(source: &XRInputSource, spaces: &Hand<DomRoot<XRJointSpace>>) -> XRHand {
+        XRHand {
+            reflector_: Reflector::new(),
+            source: Dom::from_ref(source),
+            spaces: spaces.map(|j, _| j.as_ref().map(|j| Dom::from_ref(&**j))),
+        }
+    }
+
+    pub fn new(global: &GlobalScope, source: &XRInputSource, support: Hand<()>) -> DomRoot<XRHand> {
+        let id = source.id();
+        let session = source.session();
+        let spaces = support
+            .map(|field, joint| field.map(|_| XRJointSpace::new(global, session, id, joint)));
+        reflect_dom_object(Box::new(XRHand::new_inherited(source, &spaces)), global)
+    }
+}
+
+impl XRHandMethods for XRHand {
+    /// https://github.com/immersive-web/webxr-hands-input/blob/master/explainer.md
+    fn Length(&self) -> i32 {
+        XRHandConstants::LITTLE_PHALANX_TIP as i32 + 1
+    }
+
+    /// https://github.com/immersive-web/webxr-hands-input/blob/master/explainer.md
+    fn IndexedGetter(&self, joint_index: u32) -> Option<DomRoot<XRJointSpace>> {
+        let joint = match joint_index {
+            XRHandConstants::WRIST => Joint::Wrist,
+            XRHandConstants::THUMB_METACARPAL => Joint::ThumbMetacarpal,
+            XRHandConstants::THUMB_PHALANX_PROXIMAL => Joint::ThumbPhalanxProximal,
+            XRHandConstants::THUMB_PHALANX_DISTAL => Joint::ThumbPhalanxDistal,
+            XRHandConstants::THUMB_PHALANX_TIP => Joint::ThumbPhalanxTip,
+            XRHandConstants::INDEX_METACARPAL => Joint::Index(FingerJoint::Metacarpal),
+            XRHandConstants::INDEX_PHALANX_PROXIMAL => Joint::Index(FingerJoint::PhalanxProximal),
+            XRHandConstants::INDEX_PHALANX_INTERMEDIATE => {
+                Joint::Index(FingerJoint::PhalanxIntermediate)
+            },
+            XRHandConstants::INDEX_PHALANX_DISTAL => Joint::Index(FingerJoint::PhalanxDistal),
+            XRHandConstants::INDEX_PHALANX_TIP => Joint::Index(FingerJoint::PhalanxTip),
+            XRHandConstants::MIDDLE_METACARPAL => Joint::Middle(FingerJoint::Metacarpal),
+            XRHandConstants::MIDDLE_PHALANX_PROXIMAL => Joint::Middle(FingerJoint::PhalanxProximal),
+            XRHandConstants::MIDDLE_PHALANX_INTERMEDIATE => {
+                Joint::Middle(FingerJoint::PhalanxIntermediate)
+            },
+            XRHandConstants::MIDDLE_PHALANX_DISTAL => Joint::Middle(FingerJoint::PhalanxDistal),
+            XRHandConstants::MIDDLE_PHALANX_TIP => Joint::Middle(FingerJoint::PhalanxTip),
+            XRHandConstants::RING_METACARPAL => Joint::Ring(FingerJoint::Metacarpal),
+            XRHandConstants::RING_PHALANX_PROXIMAL => Joint::Ring(FingerJoint::PhalanxProximal),
+            XRHandConstants::RING_PHALANX_INTERMEDIATE => {
+                Joint::Ring(FingerJoint::PhalanxIntermediate)
+            },
+            XRHandConstants::RING_PHALANX_DISTAL => Joint::Ring(FingerJoint::PhalanxDistal),
+            XRHandConstants::RING_PHALANX_TIP => Joint::Ring(FingerJoint::PhalanxTip),
+            XRHandConstants::LITTLE_METACARPAL => Joint::Little(FingerJoint::Metacarpal),
+            XRHandConstants::LITTLE_PHALANX_PROXIMAL => Joint::Little(FingerJoint::PhalanxProximal),
+            XRHandConstants::LITTLE_PHALANX_INTERMEDIATE => {
+                Joint::Little(FingerJoint::PhalanxIntermediate)
+            },
+            XRHandConstants::LITTLE_PHALANX_DISTAL => Joint::Little(FingerJoint::PhalanxDistal),
+            XRHandConstants::LITTLE_PHALANX_TIP => Joint::Little(FingerJoint::PhalanxTip),
+            // XXXManishearth should this be a TypeError?
+            _ => return None,
+        };
+        self.spaces.get(joint).map(|j| DomRoot::from_ref(&**j))
+    }
+}