bluetooth: Add characteristicvaluechanged event

third_party/WebKit/Source/modules/bluetooth/BluetoothGATTCharacteristic.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "modules/bluetooth/BluetoothGATTCharacteristic.h"
 
 #include "bindings/core/v8/CallbackPromiseAdapter.h"
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/ExceptionCode.h"
+#include "core/events/Event.h"
 #include "modules/bluetooth/BluetoothError.h"
 #include "modules/bluetooth/BluetoothSupplement.h"
 #include "modules/bluetooth/ConvertWebVectorToArrayBuffer.h"
 #include "public/platform/modules/bluetooth/WebBluetooth.h"
 
 namespace blink {
 
 BluetoothGATTCharacteristic::BluetoothGATTCharacteristic(ExecutionContext* context, PassOwnPtr<WebBluetoothGATTCharacteristicInit> webCharacteristic)
     : ActiveDOMObject(context)
     , m_webCharacteristic(webCharacteristic)
     , m_stopped(false)
 {
     // See example in Source/platform/heap/ThreadState.h
     ThreadState::current()->registerPreFinalizer(this);
 }
 
 BluetoothGATTCharacteristic* BluetoothGATTCharacteristic::take(ScriptPromiseResolver* resolver, PassOwnPtr<WebBluetoothGATTCharacteristicInit> webCharacteristic)
 {
     if (!webCharacteristic) {
         return nullptr;
     }
     BluetoothGATTCharacteristic* characteristic = new BluetoothGATTCharacteristic(resolver->executionContext(), webCharacteristic);
     // See note in ActiveDOMObject about suspendIfNeeded.
     characteristic->suspendIfNeeded();
     return characteristic;
 }
 
+void BluetoothGATTCharacteristic::dispatchCharacteristicValueChanged(
+    const WebVector<uint8_t>& value)
+{
+    static_assert(sizeof(*value.data()) == 1, "uint8_t should be a single byte");
+
+    m_value = DOMArrayBuffer::create(value.data(), value.size());
+
+    dispatchEvent(Event::create(EventTypeNames::characteristicvaluechanged));
+}
+
 void BluetoothGATTCharacteristic::stop()
 {
     notifyCharacteristicObjectRemoved();
 }
 
 void BluetoothGATTCharacteristic::dispose()
 {
     notifyCharacteristicObjectRemoved();
 }
 
 void BluetoothGATTCharacteristic::notifyCharacteristicObjectRemoved()
 {
     if (!m_stopped) {
         m_stopped = true;
         WebBluetooth* webbluetooth = BluetoothSupplement::fromExecutionContext(ActiveDOMObject::executionContext());
         webbluetooth->characteristicObjectRemoved(m_webCharacteristic->characteristicInstanceID, this);
     }
 }
 
+const WTF::AtomicString& BluetoothGATTCharacteristic::interfaceName() const
+{
+    return EventTargetNames::BluetoothGATTCharacteristic;
+}
+
+ExecutionContext* BluetoothGATTCharacteristic::executionContext() const
+{
+    return ActiveDOMObject::executionContext();
+}
+
+bool BluetoothGATTCharacteristic::addEventListener(const AtomicString& eventType, PassRefPtrWillBeRawPtr<EventListener> listener, bool useCapture)
+{
+    // We will also need to unregister a characteristic once all the event
+    // listeners have been removed. See http://crbug.com/541390
+    if (eventType == EventTypeNames::characteristicvaluechanged) {
+        WebBluetooth* webbluetooth = BluetoothSupplement::fromExecutionContext(executionContext());
+        webbluetooth->registerCharacteristicObject(m_webCharacteristic->characteristicInstanceID, this);
+    }
+    return EventTarget::addEventListener(eventType, listener, useCapture);
+}
+
 ScriptPromise BluetoothGATTCharacteristic::readValue(ScriptState* scriptState)
 {
     WebBluetooth* webbluetooth = BluetoothSupplement::fromScriptState(scriptState);
 
     ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
     ScriptPromise promise = resolver->promise();
     webbluetooth->readValue(m_webCharacteristic->characteristicInstanceID, new CallbackPromiseAdapter<ConvertWebVectorToArrayBuffer, BluetoothError>(resolver));
 
     return promise;
 }
@@ skipping 33 matching lines @@
 {
     WebBluetooth* webbluetooth = BluetoothSupplement::fromScriptState(scriptState);
     ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
     ScriptPromise promise = resolver->promise();
     webbluetooth->stopNotifications(m_webCharacteristic->characteristicInstanceID, this, new CallbackPromiseAdapter<void, BluetoothError>(resolver));
     return promise;
 }
 
 DEFINE_TRACE(BluetoothGATTCharacteristic)
 {
+    RefCountedGarbageCollectedEventTargetWithInlineData<BluetoothGATTCharacteristic>::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink