1 files changed, 104 insertions, 0 deletions
diff --git a/widget/android/EventDispatcher.h b/widget/android/EventDispatcher.h
new file mode 100644
index 0000000000..a7daa18d7d
--- /dev/null
+++ b/widget/android/EventDispatcher.h
@@ -0,0 +1,104 @@
+/* -*- Mode: c++; c-basic-offset: 2; tab-width: 20; indent-tabs-mode: nil; -*-
+ * vim: set sw=2 ts=4 expandtab:
+ * 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/. */
+
+#ifndef mozilla_widget_EventDispatcher_h
+#define mozilla_widget_EventDispatcher_h
+
+#include "jsapi.h"
+#include "nsClassHashtable.h"
+#include "nsCOMArray.h"
+#include "nsIAndroidBridge.h"
+#include "nsHashKeys.h"
+#include "nsPIDOMWindow.h"
+
+#include "mozilla/java/EventDispatcherNatives.h"
+#include "mozilla/java/GeckoBundleWrappers.h"
+#include "mozilla/Mutex.h"
+
+namespace mozilla {
+namespace widget {
+
+/**
+ * EventDispatcher is the Gecko counterpart to the Java EventDispatcher class.
+ * Together, they make up a unified event bus. Events dispatched from the Java
+ * side may notify event listeners on the Gecko side, and vice versa.
+ */
+class EventDispatcher final
+    : public nsIAndroidEventDispatcher,
+      public java::EventDispatcher::Natives<EventDispatcher> {
+  using NativesBase = java::EventDispatcher::Natives<EventDispatcher>;
+
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIANDROIDEVENTDISPATCHER
+
+  EventDispatcher() {}
+
+  void Attach(java::EventDispatcher::Param aDispatcher,
+              nsPIDOMWindowOuter* aDOMWindow);
+  void Detach();
+
+  nsresult Dispatch(const char16_t* aEvent,
+                    java::GeckoBundle::Param aData = nullptr,
+                    nsIAndroidEventCallback* aCallback = nullptr);
+
+  bool HasListener(const char16_t* aEvent);
+  bool HasGeckoListener(jni::String::Param aEvent);
+  void DispatchToGecko(jni::String::Param aEvent, jni::Object::Param aData,
+                       jni::Object::Param aCallback);
+
+  static nsresult UnboxBundle(JSContext* aCx, jni::Object::Param aData,
+                              JS::MutableHandle<JS::Value> aOut);
+
+  nsIGlobalObject* GetGlobalObject();
+
+  using NativesBase::DisposeNative;
+
+ private:
+  friend class java::EventDispatcher::Natives<EventDispatcher>;
+
+  java::EventDispatcher::WeakRef mDispatcher;
+  nsCOMPtr<nsPIDOMWindowOuter> mDOMWindow;
+
+  virtual ~EventDispatcher() {}
+
+  void Shutdown();
+
+  struct ListenersList {
+    nsCOMArray<nsIAndroidEventListener> listeners{/* count */ 1};
+    // 0 if the list can be modified
+    uint32_t lockCount{0};
+    // true if this list has a listener that is being unregistered
+    bool unregistering{false};
+  };
+
+  using ListenersMap = nsClassHashtable<nsStringHashKey, ListenersList>;
+
+  Mutex mLock MOZ_UNANNOTATED{"mozilla::widget::EventDispatcher"};
+  ListenersMap mListenersMap;
+
+  using IterateEventsCallback =
+      nsresult (EventDispatcher::*)(const nsAString&, nsIAndroidEventListener*);
+
+  nsresult IterateEvents(JSContext* aCx, JS::Handle<JS::Value> aEvents,
+                         IterateEventsCallback aCallback,
+                         nsIAndroidEventListener* aListener);
+  nsresult RegisterEventLocked(const nsAString&, nsIAndroidEventListener*);
+  nsresult UnregisterEventLocked(const nsAString&, nsIAndroidEventListener*);
+
+  nsresult DispatchOnGecko(ListenersList* list, const nsAString& aEvent,
+                           JS::Handle<JS::Value> aData,
+                           nsIAndroidEventCallback* aCallback);
+
+  java::EventDispatcher::NativeCallbackDelegate::LocalRef WrapCallback(
+      nsIAndroidEventCallback* aCallback,
+      nsIAndroidEventFinalizer* aFinalizer = nullptr);
+};
+
+}  // namespace widget
+}  // namespace mozilla
+
+#endif  // mozilla_widget_EventDispatcher_h