script: Create structures for TextTrack API

Fill out the basics for the WebIDLs for the following:

  - TextTrack
  - TextTrackCue
  - TextTrackCueList
  - TextTrackList

components/script/dom/texttrackcue.rs

@@ -0,0 +1,111 @@
+/* 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::TextTrackCueBinding::{self, TextTrackCueMethods};
+use crate::dom::bindings::num::Finite;
+use crate::dom::bindings::reflector::reflect_dom_object;
+use crate::dom::bindings::root::{Dom, DomRoot};
+use crate::dom::bindings::str::DOMString;
+use crate::dom::eventtarget::EventTarget;
+use crate::dom::texttrack::TextTrack;
+use crate::dom::window::Window;
+use dom_struct::dom_struct;
+use std::cell::Cell;
+
+#[dom_struct]
+pub struct TextTrackCue {
+    eventtarget: EventTarget,
+    id: DomRefCell<DOMString>,
+    track: Option<Dom<TextTrack>>,
+    start_time: Cell<f64>,
+    end_time: Cell<f64>,
+    pause_on_exit: Cell<bool>,
+}
+
+impl TextTrackCue {
+    // FIXME(#22314, dlrobertson) implement VTTCue.
+    #[allow(dead_code)]
+    pub fn new_inherited(id: DOMString, track: Option<&TextTrack>) -> TextTrackCue {
+        TextTrackCue {
+            eventtarget: EventTarget::new_inherited(),
+            id: DomRefCell::new(id),
+            track: track.map(Dom::from_ref),
+            start_time: Cell::new(0.),
+            end_time: Cell::new(0.),
+            pause_on_exit: Cell::new(false),
+        }
+    }
+
+    // FIXME(#22314, dlrobertson) implement VTTCue.
+    #[allow(dead_code)]
+    pub fn new(window: &Window, id: DOMString, track: Option<&TextTrack>) -> DomRoot<TextTrackCue> {
+        reflect_dom_object(
+            Box::new(TextTrackCue::new_inherited(id, track)),
+            window,
+            TextTrackCueBinding::Wrap,
+        )
+    }
+
+    pub fn id(&self) -> DOMString {
+        self.id.borrow().clone()
+    }
+
+    pub fn get_track(&self) -> Option<DomRoot<TextTrack>> {
+        self.track.as_ref().map(|t| DomRoot::from_ref(&**t))
+    }
+}
+
+impl TextTrackCueMethods for TextTrackCue {
+    // https://html.spec.whatwg.org/multipage/#dom-texttrackcue-id
+    fn Id(&self) -> DOMString {
+        self.id()
+    }
+
+    // https://html.spec.whatwg.org/multipage/#dom-texttrackcue-id
+    fn SetId(&self, value: DOMString) {
+        *self.id.borrow_mut() = value;
+    }
+
+    // https://html.spec.whatwg.org/multipage/#dom-texttrackcue-track
+    fn GetTrack(&self) -> Option<DomRoot<TextTrack>> {
+        self.get_track()
+    }
+
+    // https://html.spec.whatwg.org/multipage/#dom-texttrackcue-starttime
+    fn StartTime(&self) -> Finite<f64> {
+        Finite::wrap(self.start_time.get())
+    }
+
+    // https://html.spec.whatwg.org/multipage/#dom-texttrackcue-starttime
+    fn SetStartTime(&self, value: Finite<f64>) {
+        self.start_time.set(*value);
+    }
+
+    // https://html.spec.whatwg.org/multipage/#dom-texttrackcue-endtime
+    fn EndTime(&self) -> Finite<f64> {
+        Finite::wrap(self.end_time.get())
+    }
+
+    // https://html.spec.whatwg.org/multipage/#dom-texttrackcue-endtime
+    fn SetEndTime(&self, value: Finite<f64>) {
+        self.end_time.set(*value);
+    }
+
+    // https://html.spec.whatwg.org/multipage/#dom-texttrackcue-pauseonexit
+    fn PauseOnExit(&self) -> bool {
+        self.pause_on_exit.get()
+    }
+
+    // https://html.spec.whatwg.org/multipage/#dom-texttrackcue-pauseonexit
+    fn SetPauseOnExit(&self, value: bool) {
+        self.pause_on_exit.set(value);
+    }
+
+    // https://html.spec.whatwg.org/multipage/#handler-texttrackcue-onenter
+    event_handler!(onenter, GetOnenter, SetOnenter);
+
+    // https://html.spec.whatwg.org/multipage/#handler-texttrackcue-onexit
+    event_handler!(onexit, GetOnexit, SetOnexit);
+}