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MIDIInput.cpp (3263B)

      1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim:set ts=2 sw=2 sts=2 et cindent: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #include "mozilla/dom/MIDIInput.h"
      8 
      9 #include "MIDILog.h"
     10 #include "mozilla/dom/Document.h"
     11 #include "mozilla/dom/MIDIInputBinding.h"
     12 #include "mozilla/dom/MIDIMessageEvent.h"
     13 #include "mozilla/dom/MIDIMessageEventBinding.h"
     14 #include "mozilla/dom/MIDIPortChild.h"
     15 #include "nsGlobalWindowInner.h"
     16 
     17 namespace mozilla::dom {
     18 
     19 MIDIInput::MIDIInput(nsPIDOMWindowInner* aWindow)
     20    : MIDIPort(aWindow), mKeepAlive(false) {}
     21 
     22 // static
     23 RefPtr<MIDIInput> MIDIInput::Create(nsPIDOMWindowInner* aWindow,
     24                                    MIDIAccess* aMIDIAccessParent,
     25                                    const MIDIPortInfo& aPortInfo,
     26                                    const bool aSysexEnabled) {
     27  MOZ_ASSERT(static_cast<MIDIPortType>(aPortInfo.type()) ==
     28             MIDIPortType::Input);
     29  RefPtr<MIDIInput> port = new MIDIInput(aWindow);
     30  if (!port->Initialize(aPortInfo, aSysexEnabled, aMIDIAccessParent)) {
     31    return nullptr;
     32  }
     33  return port;
     34 }
     35 
     36 JSObject* MIDIInput::WrapObject(JSContext* aCx,
     37                                JS::Handle<JSObject*> aGivenProto) {
     38  return MIDIInput_Binding::Wrap(aCx, this, aGivenProto);
     39 }
     40 
     41 void MIDIInput::Receive(const nsTArray<MIDIMessage>& aMsgs) {
     42  if (!GetOwnerWindow()) {
     43    return;  // Ignore messages once we've been disconnected from the owner
     44  }
     45 
     46  nsCOMPtr<Document> doc = GetOwnerWindow()->GetDoc();
     47  if (!doc) {
     48    NS_WARNING("No document available to send MIDIMessageEvent to!");
     49    return;
     50  }
     51  for (const auto& msg : aMsgs) {
     52    RefPtr<MIDIMessageEvent> event(
     53        MIDIMessageEvent::Constructor(this, msg.timestamp(), msg.data()));
     54    DispatchTrustedEvent(event);
     55  }
     56 }
     57 
     58 void MIDIInput::StateChange() {
     59  if (Port()->ConnectionState() == MIDIPortConnectionState::Open ||
     60      (Port()->DeviceState() == MIDIPortDeviceState::Connected &&
     61       Port()->ConnectionState() == MIDIPortConnectionState::Pending)) {
     62    KeepAliveOnMidimessage();
     63  } else {
     64    DontKeepAliveOnMidimessage();
     65  }
     66 }
     67 
     68 void MIDIInput::EventListenerAdded(nsAtom* aType) {
     69  if (aType == nsGkAtoms::onmidimessage) {
     70    // HACK: the Web MIDI spec states that we should open a port only when
     71    // setting the midimessage event handler but Chrome does it even when
     72    // adding event listeners hence this.
     73    if (Port()->ConnectionState() != MIDIPortConnectionState::Open) {
     74      LOG("onmidimessage event listener added, sending implicit Open");
     75      Port()->SendOpen();
     76    }
     77  }
     78 
     79  DOMEventTargetHelper::EventListenerAdded(aType);
     80 }
     81 
     82 void MIDIInput::DisconnectFromOwner() {
     83  DontKeepAliveOnMidimessage();
     84 
     85  MIDIPort::DisconnectFromOwner();
     86 }
     87 
     88 void MIDIInput::KeepAliveOnMidimessage() {
     89  if (!mKeepAlive) {
     90    mKeepAlive = true;
     91    KeepAliveIfHasListenersFor(nsGkAtoms::onmidimessage);
     92  }
     93 }
     94 
     95 void MIDIInput::DontKeepAliveOnMidimessage() {
     96  if (mKeepAlive) {
     97    IgnoreKeepAliveIfHasListenersFor(nsGkAtoms::onmidimessage);
     98    mKeepAlive = false;
     99  }
    100 }
    101 
    102 }  // namespace mozilla::dom