The Tor Browser: widget/gonk/libui/InputManager.h@fc2d59ddac77

     1 /*

     2  * Copyright (C) 2010 The Android Open Source Project

     3  *

     4  * Licensed under the Apache License, Version 2.0 (the "License");

     5  * you may not use this file except in compliance with the License.

     6  * You may obtain a copy of the License at

     7  *

     8  *      http://www.apache.org/licenses/LICENSE-2.0

     9  *

    10  * Unless required by applicable law or agreed to in writing, software

    11  * distributed under the License is distributed on an "AS IS" BASIS,

    12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

    13  * See the License for the specific language governing permissions and

    14  * limitations under the License.

    15  */

    17 #ifndef _UI_INPUT_MANAGER_H

    18 #define _UI_INPUT_MANAGER_H

    20 /**

    21  * Native input manager.

    22  */

    24 #include "EventHub.h"

    25 #include "InputReader.h"

    26 #include "InputDispatcher.h"

    28 #include "Input.h"

    29 #include "InputTransport.h"

    30 #include <utils/Errors.h>

    31 #include <utils/Vector.h>

    32 #include <utils/Timers.h>

    33 #include <utils/RefBase.h>

    34 #include <utils/String8.h>

    36 namespace android {

    38 /*

    39  * The input manager is the core of the system event processing.

    40  *

    41  * The input manager uses two threads.

    42  *

    43  * 1. The InputReaderThread (called "InputReader") reads and preprocesses raw input events,

    44  *    applies policy, and posts messages to a queue managed by the DispatcherThread.

    45  * 2. The InputDispatcherThread (called "InputDispatcher") thread waits for new events on the

    46  *    queue and asynchronously dispatches them to applications.

    47  *

    48  * By design, the InputReaderThread class and InputDispatcherThread class do not share any

    49  * internal state.  Moreover, all communication is done one way from the InputReaderThread

    50  * into the InputDispatcherThread and never the reverse.  Both classes may interact with the

    51  * InputDispatchPolicy, however.

    52  *

    53  * The InputManager class never makes any calls into Java itself.  Instead, the

    54  * InputDispatchPolicy is responsible for performing all external interactions with the

    55  * system, including calling DVM services.

    56  */

    57 class InputManagerInterface : public virtual RefBase {

    58 protected:

    59     InputManagerInterface() { }

    60     virtual ~InputManagerInterface() { }

    62 public:

    63     /* Starts the input manager threads. */

    64     virtual status_t start() = 0;

    66     /* Stops the input manager threads and waits for them to exit. */

    67     virtual status_t stop() = 0;

    69     /* Gets the input reader. */

    70     virtual sp<InputReaderInterface> getReader() = 0;

    72     /* Gets the input dispatcher. */

    73     virtual sp<InputDispatcherInterface> getDispatcher() = 0;

    74 };

    76 class InputManager : public InputManagerInterface {

    77 protected:

    78     virtual ~InputManager();

    80 public:

    81     InputManager(

    82             const sp<EventHubInterface>& eventHub,

    83             const sp<InputReaderPolicyInterface>& readerPolicy,

    84             const sp<InputDispatcherPolicyInterface>& dispatcherPolicy);

    86     // (used for testing purposes)

    87     InputManager(

    88             const sp<InputReaderInterface>& reader,

    89             const sp<InputDispatcherInterface>& dispatcher);

    91     virtual status_t start();

    92     virtual status_t stop();

    94     virtual sp<InputReaderInterface> getReader();

    95     virtual sp<InputDispatcherInterface> getDispatcher();

    97 private:

    98     sp<InputReaderInterface> mReader;

    99     sp<InputReaderThread> mReaderThread;

   101     sp<InputDispatcherInterface> mDispatcher;

   102     sp<InputDispatcherThread> mDispatcherThread;

   104     void initialize();

   105 };

   107 } // namespace android

   109 #endif // _UI_INPUT_MANAGER_H

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