gecko/content/media/TextTrackCue.cpp
Ralph Giles d98efa09c2 Bug 833385 - Implement HTMLTrackElement and TextTrack. r=bz,Ms2ger
Add webidl interfaces and implementations of the HTML <track>
element and related TextTrack, TextTrackList, TextTrackCue,
and TextTrackCueList dom objects.

Visibility is controlled by the media.webvtt.enabled pref,
which defaults to false.

HTMLMediaElement:NewURIFromString() is hoisted to
nsGenericHTMLElement so it's available to the track
element as well.

This patch is primarily work by Dale Karp, David Humphrey
and others as Seneca College.
2013-05-22 00:14:00 +08:00

103 lines
2.6 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 http://mozilla.org/MPL/2.0/. */
#include "mozilla/dom/HTMLTrackElement.h"
#include "mozilla/dom/TextTrackCue.h"
#include "mozilla/dom/TextTrackCueBinding.h"
#include "webvtt/cue.h"
namespace mozilla {
namespace dom {
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_3(TextTrackCue,
mGlobal,
mTrack,
mTrackElement)
NS_IMPL_ADDREF_INHERITED(TextTrackCue, nsDOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(TextTrackCue, nsDOMEventTargetHelper)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(TextTrackCue)
NS_INTERFACE_MAP_END_INHERITING(nsDOMEventTargetHelper)
// Set cue setting defaults based on step 19 & seq.
// in http://dev.w3.org/html5/webvtt/#parsing
void
TextTrackCue::SetDefaultCueSettings()
{
mPosition = 50;
mSize = 100;
mPauseOnExit = false;
mSnapToLines = true;
mLine = WEBVTT_AUTO;
mAlign = TextTrackCueAlign::Middle;
}
TextTrackCue::TextTrackCue(nsISupports* aGlobal,
double aStartTime,
double aEndTime,
const nsAString& aText)
: mGlobal(aGlobal)
, mText(aText)
, mStartTime(aStartTime)
, mEndTime(aEndTime)
, mHead(nullptr)
{
SetDefaultCueSettings();
MOZ_ASSERT(aGlobal);
SetIsDOMBinding();
}
TextTrackCue::TextTrackCue(nsISupports* aGlobal,
double aStartTime,
double aEndTime,
const nsAString& aText,
HTMLTrackElement* aTrackElement,
webvtt_node* head)
: mGlobal(aGlobal)
, mText(aText)
, mStartTime(aStartTime)
, mEndTime(aEndTime)
, mTrackElement(aTrackElement)
, mHead(head)
{
// Use the webvtt library's reference counting.
webvtt_ref_node(mHead);
SetDefaultCueSettings();
MOZ_ASSERT(aGlobal);
SetIsDOMBinding();
}
TextTrackCue::~TextTrackCue()
{
if (mHead) {
// Release our reference and null mHead.
webvtt_release_node(&mHead);
}
}
void
TextTrackCue::DisplayCue()
{
if (mTrackElement) {
mTrackElement->DisplayCueText(mHead);
}
}
JSObject*
TextTrackCue::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aScope)
{
return TextTrackCueBinding::Wrap(aCx, aScope, this);
}
void
TextTrackCue::CueChanged()
{
if (mTrack) {
mTrack->CueChanged(*this);
}
}
} // namespace dom
} // namespace mozilla