Added AudioTrack, AudioTrackList, VideoTrack, VideoTrackList, and TrackEvent interfaces

components/script/dom/videotracklist.rs

@@ -0,0 +1,164 @@
+/* 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::VideoTrackListBinding::{self, VideoTrackListMethods};
+use crate::dom::bindings::inheritance::Castable;
+use crate::dom::bindings::refcounted::Trusted;
+use crate::dom::bindings::reflector::{reflect_dom_object, DomObject};
+use crate::dom::bindings::root::Dom;
+use crate::dom::bindings::root::DomRoot;
+use crate::dom::bindings::str::DOMString;
+use crate::dom::eventtarget::EventTarget;
+use crate::dom::videotrack::VideoTrack;
+use crate::dom::window::Window;
+use crate::task_source::TaskSource;
+use dom_struct::dom_struct;
+
+#[dom_struct]
+pub struct VideoTrackList {
+    eventtarget: EventTarget,
+    tracks: DomRefCell<Vec<Dom<VideoTrack>>>,
+}
+
+impl VideoTrackList {
+    pub fn new_inherited(tracks: &[&VideoTrack]) -> VideoTrackList {
+        VideoTrackList {
+            eventtarget: EventTarget::new_inherited(),
+            tracks: DomRefCell::new(tracks.iter().map(|track| Dom::from_ref(&**track)).collect()),
+        }
+    }
+
+    pub fn new(window: &Window, tracks: &[&VideoTrack]) -> DomRoot<VideoTrackList> {
+        reflect_dom_object(
+            Box::new(VideoTrackList::new_inherited(tracks)),
+            window,
+            VideoTrackListBinding::Wrap,
+        )
+    }
+
+    pub fn len(&self) -> usize {
+        self.tracks.borrow().len()
+    }
+
+    pub fn item(&self, idx: usize) -> Option<DomRoot<VideoTrack>> {
+        self.tracks
+            .borrow()
+            .get(idx)
+            .map(|track| DomRoot::from_ref(&**track))
+    }
+
+    pub fn selected_index(&self) -> Option<usize> {
+        self.tracks
+            .borrow()
+            .iter()
+            .position(|track| track.selected())
+    }
+
+    // TODO(#22799) Integrate DOM Audio and Video track selection with media player.
+    pub fn set_selected(&self, idx: usize, value: bool) {
+        let track = match self.item(idx) {
+            Some(t) => t,
+            None => return,
+        };
+
+        // If the chosen tracks selected status is the same as the new status, return early.
+        if track.selected() == value {
+            return;
+        }
+
+        let global = &self.global();
+        let this = Trusted::new(self);
+        let (source, canceller) = global
+            .as_window()
+            .task_manager()
+            .media_element_task_source_with_canceller();
+
+        if let Some(current) = self.selected_index() {
+            if current != idx {
+                self.tracks.borrow()[current].set_selected(false);
+                track.set_selected(true);
+
+                let _ = source.queue_with_canceller(
+                    task!(media_track_change: move || {
+                        let this = this.root();
+                        this.upcast::<EventTarget>().fire_event(atom!("change"));
+                    }),
+                    &canceller,
+                );
+            } else {
+                self.tracks.borrow()[current].set_selected(false);
+
+                let _ = source.queue_with_canceller(
+                    task!(media_track_change: move || {
+                        let this = this.root();
+                        this.upcast::<EventTarget>().fire_event(atom!("change"));
+                    }),
+                    &canceller,
+                );
+            }
+        } else {
+            track.set_selected(true);
+
+            let _ = source.queue_with_canceller(
+                task!(media_track_change: move || {
+                    let this = this.root();
+                    this.upcast::<EventTarget>().fire_event(atom!("change"));
+                }),
+                &canceller,
+            );
+        }
+    }
+
+    pub fn add(&self, track: &VideoTrack) {
+        self.tracks.borrow_mut().push(Dom::from_ref(track));
+        if track.selected() {
+            if let Some(idx) = self.selected_index() {
+                self.set_selected(idx, false);
+            }
+        }
+    }
+
+    pub fn clear(&self) {
+        self.tracks.borrow_mut().clear();
+    }
+}
+
+impl VideoTrackListMethods for VideoTrackList {
+    // https://html.spec.whatwg.org/multipage/#dom-videotracklist-length
+    fn Length(&self) -> u32 {
+        self.len() as u32
+    }
+
+    // https://html.spec.whatwg.org/multipage/#dom-tracklist-item
+    fn IndexedGetter(&self, idx: u32) -> Option<DomRoot<VideoTrack>> {
+        self.item(idx as usize)
+    }
+
+    // https://html.spec.whatwg.org/multipage/#dom-videotracklist-gettrackbyid
+    fn GetTrackById(&self, id: DOMString) -> Option<DomRoot<VideoTrack>> {
+        self.tracks
+            .borrow()
+            .iter()
+            .find(|track| track.id() == id)
+            .map(|track| DomRoot::from_ref(&**track))
+    }
+
+    // https://html.spec.whatwg.org/multipage/#dom-videotrack-selected
+    fn SelectedIndex(&self) -> i32 {
+        if let Some(idx) = self.selected_index() {
+            return idx as i32;
+        }
+        return -1;
+    }
+
+    // https://html.spec.whatwg.org/multipage/#handler-tracklist-onchange
+    event_handler!(change, GetOnchange, SetOnchange);
+
+    // https://html.spec.whatwg.org/multipage/#handler-tracklist-onaddtrack
+    event_handler!(addtrack, GetOnaddtrack, SetOnaddtrack);
+
+    // https://html.spec.whatwg.org/multipage/#handler-tracklist-onremovetrack
+    event_handler!(removetrack, GetOnremovetrack, SetOnremovetrack);
+}