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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;
/* Registers an input channel prior to using it as the target of an event. */
virtual status_t registerInputChannel(const sp<InputChannel>& inputChannel) = 0;
/* Unregisters an input channel. */
virtual status_t unregisterInputChannel(const sp<InputChannel>& inputChannel) = 0;
/* Injects an input event and optionally waits for sync.
* This method may block even if sync is false because it must wait for previous events
* to be dispatched before it can determine whether input event injection will be
* permitted based on the current input focus.
* Returns one of the INPUT_EVENT_INJECTION_XXX constants.
*/
virtual int32_t injectInputEvent(const InputEvent* event,
int32_t injectorPid, int32_t injectorUid, bool sync, int32_t timeoutMillis) = 0;
/* Preempts input dispatch in progress by making pending synchronous
* dispatches asynchronous instead. This method is generally called during a focus
* transition from one application to the next so as to enable the new application
* to start receiving input as soon as possible without having to wait for the
* old application to finish up.
*/
virtual void preemptInputDispatch() = 0;
/* Gets input device configuration. */
virtual void getInputConfiguration(InputConfiguration* outConfiguration) const = 0;
/*
* Queries current input state.
* deviceId may be -1 to search for the device automatically, filtered by class.
* deviceClasses may be -1 to ignore device class while searching.
*/
virtual int32_t getScanCodeState(int32_t deviceId, int32_t deviceClasses,
int32_t scanCode) const = 0;
virtual int32_t getKeyCodeState(int32_t deviceId, int32_t deviceClasses,
int32_t keyCode) const = 0;
virtual int32_t getSwitchState(int32_t deviceId, int32_t deviceClasses,
int32_t sw) const = 0;
/* Determines whether physical keys exist for the given framework-domain key codes. */
virtual bool hasKeys(size_t numCodes, const int32_t* keyCodes, uint8_t* outFlags) const = 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 status_t registerInputChannel(const sp<InputChannel>& inputChannel);
virtual status_t unregisterInputChannel(const sp<InputChannel>& inputChannel);
virtual int32_t injectInputEvent(const InputEvent* event,
int32_t injectorPid, int32_t injectorUid, bool sync, int32_t timeoutMillis);
virtual void preemptInputDispatch();
virtual void getInputConfiguration(InputConfiguration* outConfiguration) const;
virtual int32_t getScanCodeState(int32_t deviceId, int32_t deviceClasses,
int32_t scanCode) const;
virtual int32_t getKeyCodeState(int32_t deviceId, int32_t deviceClasses,
int32_t keyCode) const;
virtual int32_t getSwitchState(int32_t deviceId, int32_t deviceClasses,
int32_t sw) const;
virtual bool hasKeys(size_t numCodes, const int32_t* keyCodes, uint8_t* outFlags) const;
private:
sp<InputReaderInterface> mReader;
sp<InputReaderThread> mReaderThread;
sp<InputDispatcherInterface> mDispatcher;
sp<InputDispatcherThread> mDispatcherThread;
void initialize();
};
} // namespace android
#endif // _UI_INPUT_MANAGER_H
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