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+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef _UI_INPUT_MANAGER_H
+#define _UI_INPUT_MANAGER_H
+
+/**
+ * Native input manager.
+ */
+
+#include <ui/EventHub.h>
+#include <ui/Input.h>
+#include <utils/Errors.h>
+#include <utils/Vector.h>
+#include <utils/Timers.h>
+#include <utils/RefBase.h>
+#include <utils/String8.h>
+
+namespace android {
+
+class InputChannel;
+
+class InputReaderInterface;
+class InputReaderPolicyInterface;
+class InputReaderThread;
+
+class InputDispatcherInterface;
+class InputDispatcherPolicyInterface;
+class InputDispatcherThread;
+
+/*
+ * The input manager is the core of the system event processing.
+ *
+ * The input manager uses two threads.
+ *
+ * 1. The InputReaderThread (called "InputReader") reads and preprocesses raw input events,
+ * applies policy, and posts messages to a queue managed by the DispatcherThread.
+ * 2. The InputDispatcherThread (called "InputDispatcher") thread waits for new events on the
+ * queue and asynchronously dispatches them to applications.
+ *
+ * By design, the InputReaderThread class and InputDispatcherThread class do not share any
+ * internal state. Moreover, all communication is done one way from the InputReaderThread
+ * into the InputDispatcherThread and never the reverse. Both classes may interact with the
+ * InputDispatchPolicy, however.
+ *
+ * The InputManager class never makes any calls into Java itself. Instead, the
+ * InputDispatchPolicy is responsible for performing all external interactions with the
+ * system, including calling DVM services.
+ */
+class InputManagerInterface : public virtual RefBase {
+protected:
+ InputManagerInterface() { }
+ virtual ~InputManagerInterface() { }
+
+public:
+ /* Starts the input manager threads. */
+ virtual status_t start() = 0;
+
+ /* Stops the input manager threads and waits for them to exit. */
+ virtual status_t stop() = 0;
+
+ /* Gets the input reader. */
+ virtual sp<InputReaderInterface> getReader() = 0;
+
+ /* Gets the input dispatcher. */
+ virtual sp<InputDispatcherInterface> getDispatcher() = 0;
+};
+
+class InputManager : public InputManagerInterface {
+protected:
+ virtual ~InputManager();
+
+public:
+ InputManager(
+ const sp<EventHubInterface>& eventHub,
+ const sp<InputReaderPolicyInterface>& readerPolicy,
+ const sp<InputDispatcherPolicyInterface>& dispatcherPolicy);
+
+ // (used for testing purposes)
+ InputManager(
+ const sp<InputReaderInterface>& reader,
+ const sp<InputDispatcherInterface>& dispatcher);
+
+ virtual status_t start();
+ virtual status_t stop();
+
+ virtual sp<InputReaderInterface> getReader();
+ virtual sp<InputDispatcherInterface> getDispatcher();
+
+private:
+ sp<InputReaderInterface> mReader;
+ sp<InputReaderThread> mReaderThread;
+
+ sp<InputDispatcherInterface> mDispatcher;
+ sp<InputDispatcherThread> mDispatcherThread;
+
+ void initialize();
+};
+
+} // namespace android
+
+#endif // _UI_INPUT_MANAGER_H