device/gamepad/android/java/src/org/chromium/device/gamepad/GamepadList.java - chromium/src - Git at Google

 // Copyright 2014 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.

 package org.chromium.device.gamepad;

 import android.annotation.SuppressLint;
 import android.content.Context;
 import android.hardware.input.InputManager;
 import android.hardware.input.InputManager.InputDeviceListener;
 import android.view.InputDevice;
 import android.view.InputEvent;
 import android.view.KeyEvent;
 import android.view.MotionEvent;

 import org.chromium.base.ThreadUtils;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;

 /**
  * Class to manage connected gamepad devices list.
  *
  * It is a Java counterpart of GamepadPlatformDataFetcherAndroid and feeds Gamepad API with input
  * data.
  */
 @JNINamespace("device")
 public class GamepadList {
     private static final int MAX_GAMEPADS = 4;

     private final Object mLock = new Object();

     private final GamepadDevice[] mGamepadDevices = new GamepadDevice[MAX_GAMEPADS];
     private InputManager mInputManager;
     private int mAttachedToWindowCounter;
     private boolean mIsGamepadAPIActive;
     private InputDeviceListener mInputDeviceListener;

     private GamepadList() {
         mInputDeviceListener = new InputDeviceListener() {
             // Override InputDeviceListener methods
             @Override
             public void onInputDeviceChanged(int deviceId) {
                 onInputDeviceChangedImpl(deviceId);
             }

             @Override
             public void onInputDeviceRemoved(int deviceId) {
                 onInputDeviceRemovedImpl(deviceId);
             }

             @Override
             public void onInputDeviceAdded(int deviceId) {
                 onInputDeviceAddedImpl(deviceId);
             }
         };
     }

     private void initializeDevices() {
         // Get list of all the attached input devices.
         int[] deviceIds = mInputManager.getInputDeviceIds();
         for (int i = 0; i < deviceIds.length; i++) {
             InputDevice inputDevice = InputDevice.getDevice(deviceIds[i]);
             // Check for gamepad device
             if (isGamepadDevice(inputDevice)) {
                 // Register a new gamepad device.
                 registerGamepad(inputDevice);
             }
         }
     }

     /**
      * Notifies the GamepadList that a {@link ContentView} is attached to a window and it should
      * prepare itself for gamepad input. It must be called before {@link onGenericMotionEvent} and
      * {@link dispatchKeyEvent}.
      */
     public static void onAttachedToWindow(Context context) {
         assert ThreadUtils.runningOnUiThread();
         getInstance().attachedToWindow(context);
     }

     private void attachedToWindow(Context context) {
         if (mAttachedToWindowCounter++ == 0) {
             mInputManager = (InputManager) context.getSystemService(Context.INPUT_SERVICE);
             synchronized (mLock) {
                 initializeDevices();
             }
             // Register an input device listener.
             mInputManager.registerInputDeviceListener(mInputDeviceListener, null);
         }
     }

     /**
      * Notifies the GamepadList that a {@link ContentView} is detached from it's window.
      */
     @SuppressLint("MissingSuperCall")
     public static void onDetachedFromWindow() {
         assert ThreadUtils.runningOnUiThread();
         getInstance().detachedFromWindow();
     }

     private void detachedFromWindow() {
         if (--mAttachedToWindowCounter == 0) {
             synchronized (mLock) {
                 for (int i = 0; i < MAX_GAMEPADS; ++i) {
                     mGamepadDevices[i] = null;
                 }
             }
             mInputManager.unregisterInputDeviceListener(mInputDeviceListener);
             mInputManager = null;
         }
     }

     // ------------------------------------------------------------

     private void onInputDeviceChangedImpl(int deviceId) {}

     private void onInputDeviceRemovedImpl(int deviceId) {
         synchronized (mLock) {
             unregisterGamepad(deviceId);
         }
     }

     private void onInputDeviceAddedImpl(int deviceId) {
         InputDevice inputDevice = InputDevice.getDevice(deviceId);
         if (!isGamepadDevice(inputDevice)) return;
         synchronized (mLock) {
             registerGamepad(inputDevice);
         }
     }

     // ------------------------------------------------------------

     private static GamepadList getInstance() {
         return LazyHolder.INSTANCE;
     }

     private int getDeviceCount() {
         int count = 0;
         for (int i = 0; i < MAX_GAMEPADS; i++) {
             if (getDevice(i) != null) {
                 count++;
             }
         }
         return count;
     }

     private boolean isDeviceConnected(int index) {
         if (index < MAX_GAMEPADS && getDevice(index) != null) {
             return true;
         }
         return false;
     }

     private GamepadDevice getDeviceById(int deviceId) {
         for (int i = 0; i < MAX_GAMEPADS; i++) {
             GamepadDevice gamepad = mGamepadDevices[i];
             if (gamepad != null && gamepad.getId() == deviceId) {
                 return gamepad;
             }
         }
         return null;
     }

     private GamepadDevice getDevice(int index) {
         // Maximum 4 Gamepads can be connected at a time starting at index zero.
         assert index >= 0 && index < MAX_GAMEPADS;
         return mGamepadDevices[index];
     }

     /**
      * Handles key events from the gamepad devices.
      * @return True if the event has been consumed.
      */
     public static boolean dispatchKeyEvent(KeyEvent event) {
         if (!isGamepadEvent(event)) return false;
         return getInstance().handleKeyEvent(event);
     }

     private boolean handleKeyEvent(KeyEvent event) {
         synchronized (mLock) {
             if (!mIsGamepadAPIActive) return false;
             GamepadDevice gamepad = getGamepadForEvent(event);
             if (gamepad == null) return false;
             return gamepad.handleKeyEvent(event);
         }
     }

     /**
      * Handles motion events from the gamepad devices.
      * @return True if the event has been consumed.
      */
     public static boolean onGenericMotionEvent(MotionEvent event) {
         if (!isGamepadEvent(event)) return false;
         return getInstance().handleMotionEvent(event);
     }

     private boolean handleMotionEvent(MotionEvent event) {
         synchronized (mLock) {
             if (!mIsGamepadAPIActive) return false;
             GamepadDevice gamepad = getGamepadForEvent(event);
             if (gamepad == null) return false;
             return gamepad.handleMotionEvent(event);
         }
     }

     private int getNextAvailableIndex() {
         // When multiple gamepads are connected to a user agent, indices must be assigned on a
         // first-come first-serve basis, starting at zero. If a gamepad is disconnected, previously
         // assigned indices must not be reassigned to gamepads that continue to be connected.
         // However, if a gamepad is disconnected, and subsequently the same or a different
         // gamepad is then connected, index entries must be reused.

         for (int i = 0; i < MAX_GAMEPADS; ++i) {
             if (getDevice(i) == null) {
                 return i;
             }
         }
         // Reached maximum gamepads limit.
         return -1;
     }

     private boolean registerGamepad(InputDevice inputDevice) {
         int index = getNextAvailableIndex();
         if (index == -1) return false; // invalid index

         GamepadDevice gamepad = new GamepadDevice(index, inputDevice);
         mGamepadDevices[index] = gamepad;
         return true;
     }

     private void unregisterGamepad(int deviceId) {
         GamepadDevice gamepadDevice = getDeviceById(deviceId);
         if (gamepadDevice == null) return; // Not a registered device.
         int index = gamepadDevice.getIndex();
         mGamepadDevices[index] = null;
     }

     private static boolean isGamepadDevice(InputDevice inputDevice) {
         if (inputDevice == null) return false;
         return ((inputDevice.getSources() & InputDevice.SOURCE_JOYSTICK)
                 == InputDevice.SOURCE_JOYSTICK);
     }

     private GamepadDevice getGamepadForEvent(InputEvent event) {
         return getDeviceById(event.getDeviceId());
     }

     /**
      * @return True if HTML5 gamepad API is active.
      */
     public static boolean isGamepadAPIActive() {
         return getInstance().mIsGamepadAPIActive;
     }

     /**
      * @return True if the motion event corresponds to a gamepad event.
      */
     public static boolean isGamepadEvent(MotionEvent event) {
         return ((event.getSource() & InputDevice.SOURCE_JOYSTICK) == InputDevice.SOURCE_JOYSTICK);
     }

     /**
      * @return True if event's keycode corresponds to a gamepad key.
      */
     public static boolean isGamepadEvent(KeyEvent event) {
         int keyCode = event.getKeyCode();
         switch (keyCode) {
             // Specific handling for dpad keys is required because
             // KeyEvent.isGamepadButton doesn't consider dpad keys.
             case KeyEvent.KEYCODE_DPAD_UP:
             case KeyEvent.KEYCODE_DPAD_DOWN:
             case KeyEvent.KEYCODE_DPAD_LEFT:
             case KeyEvent.KEYCODE_DPAD_RIGHT:
                 return true;
             default:
                 return KeyEvent.isGamepadButton(keyCode);
         }
     }

     @CalledByNative
     static void updateGamepadData(long webGamepadsPtr) {
         getInstance().grabGamepadData(webGamepadsPtr);
     }

     private void grabGamepadData(long webGamepadsPtr) {
         synchronized (mLock) {
             for (int i = 0; i < MAX_GAMEPADS; i++) {
                 final GamepadDevice device = getDevice(i);
                 if (device != null) {
                     device.updateButtonsAndAxesMapping();
                     nativeSetGamepadData(webGamepadsPtr, i, device.isStandardGamepad(), true,
                             device.getName(), device.getTimestamp(), device.getAxes(),
                             device.getButtons());
                 } else {
                     nativeSetGamepadData(webGamepadsPtr, i, false, false, null, 0, null, null);
                 }
             }
         }
     }

     @CalledByNative
     static void setGamepadAPIActive(boolean isActive) {
         getInstance().setIsGamepadActive(isActive);
     }

     private void setIsGamepadActive(boolean isGamepadActive) {
         synchronized (mLock) {
             mIsGamepadAPIActive = isGamepadActive;
             if (isGamepadActive) {
                 for (int i = 0; i < MAX_GAMEPADS; i++) {
                     GamepadDevice gamepadDevice = getDevice(i);
                     if (gamepadDevice == null) continue;
                     gamepadDevice.clearData();
                 }
             }
         }
     }

     private native void nativeSetGamepadData(long webGamepadsPtr, int index, boolean mapping,
             boolean connected, String devicename, long timestamp, float[] axes, float[] buttons);

     private static class LazyHolder {
         private static final GamepadList INSTANCE = new GamepadList();
     }
 }
	// Copyright 2014 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.

	package org.chromium.device.gamepad;

	import android.annotation.SuppressLint;
	import android.content.Context;
	import android.hardware.input.InputManager;
	import android.hardware.input.InputManager.InputDeviceListener;
	import android.view.InputDevice;
	import android.view.InputEvent;
	import android.view.KeyEvent;
	import android.view.MotionEvent;

	import org.chromium.base.ThreadUtils;
	import org.chromium.base.annotations.CalledByNative;
	import org.chromium.base.annotations.JNINamespace;

	/**
	* Class to manage connected gamepad devices list.
	*
	* It is a Java counterpart of GamepadPlatformDataFetcherAndroid and feeds Gamepad API with input
	* data.
	*/
	@JNINamespace("device")
	public class GamepadList {
	private static final int MAX_GAMEPADS = 4;

	private final Object mLock = new Object();

	private final GamepadDevice[] mGamepadDevices = new GamepadDevice[MAX_GAMEPADS];
	private InputManager mInputManager;
	private int mAttachedToWindowCounter;
	private boolean mIsGamepadAPIActive;
	private InputDeviceListener mInputDeviceListener;

	private GamepadList() {
	mInputDeviceListener = new InputDeviceListener() {
	// Override InputDeviceListener methods
	@Override
	public void onInputDeviceChanged(int deviceId) {
	onInputDeviceChangedImpl(deviceId);
	}

	@Override
	public void onInputDeviceRemoved(int deviceId) {
	onInputDeviceRemovedImpl(deviceId);
	}

	@Override
	public void onInputDeviceAdded(int deviceId) {
	onInputDeviceAddedImpl(deviceId);
	}
	};
	}

	private void initializeDevices() {
	// Get list of all the attached input devices.
	int[] deviceIds = mInputManager.getInputDeviceIds();
	for (int i = 0; i < deviceIds.length; i++) {
	InputDevice inputDevice = InputDevice.getDevice(deviceIds[i]);
	// Check for gamepad device
	if (isGamepadDevice(inputDevice)) {
	// Register a new gamepad device.
	registerGamepad(inputDevice);
	}
	}
	}

	/**
	* Notifies the GamepadList that a {@link ContentView} is attached to a window and it should
	* prepare itself for gamepad input. It must be called before {@link onGenericMotionEvent} and
	* {@link dispatchKeyEvent}.
	*/
	public static void onAttachedToWindow(Context context) {
	assert ThreadUtils.runningOnUiThread();
	getInstance().attachedToWindow(context);
	}

	private void attachedToWindow(Context context) {
	if (mAttachedToWindowCounter++ == 0) {
	mInputManager = (InputManager) context.getSystemService(Context.INPUT_SERVICE);
	synchronized (mLock) {
	initializeDevices();
	}
	// Register an input device listener.
	mInputManager.registerInputDeviceListener(mInputDeviceListener, null);
	}
	}

	/**
	* Notifies the GamepadList that a {@link ContentView} is detached from it's window.
	*/
	@SuppressLint("MissingSuperCall")
	public static void onDetachedFromWindow() {
	assert ThreadUtils.runningOnUiThread();
	getInstance().detachedFromWindow();
	}

	private void detachedFromWindow() {
	if (--mAttachedToWindowCounter == 0) {
	synchronized (mLock) {
	for (int i = 0; i < MAX_GAMEPADS; ++i) {
	mGamepadDevices[i] = null;
	}
	}
	mInputManager.unregisterInputDeviceListener(mInputDeviceListener);
	mInputManager = null;
	}
	}

	// ------------------------------------------------------------

	private void onInputDeviceChangedImpl(int deviceId) {}

	private void onInputDeviceRemovedImpl(int deviceId) {
	synchronized (mLock) {
	unregisterGamepad(deviceId);
	}
	}

	private void onInputDeviceAddedImpl(int deviceId) {
	InputDevice inputDevice = InputDevice.getDevice(deviceId);
	if (!isGamepadDevice(inputDevice)) return;
	synchronized (mLock) {
	registerGamepad(inputDevice);
	}
	}

	// ------------------------------------------------------------

	private static GamepadList getInstance() {
	return LazyHolder.INSTANCE;
	}

	private int getDeviceCount() {
	int count = 0;
	for (int i = 0; i < MAX_GAMEPADS; i++) {
	if (getDevice(i) != null) {
	count++;
	}
	}
	return count;
	}

	private boolean isDeviceConnected(int index) {
	if (index < MAX_GAMEPADS && getDevice(index) != null) {
	return true;
	}
	return false;
	}

	private GamepadDevice getDeviceById(int deviceId) {
	for (int i = 0; i < MAX_GAMEPADS; i++) {
	GamepadDevice gamepad = mGamepadDevices[i];
	if (gamepad != null && gamepad.getId() == deviceId) {
	return gamepad;
	}
	}
	return null;
	}

	private GamepadDevice getDevice(int index) {
	// Maximum 4 Gamepads can be connected at a time starting at index zero.
	assert index >= 0 && index < MAX_GAMEPADS;
	return mGamepadDevices[index];
	}

	/**
	* Handles key events from the gamepad devices.
	* @return True if the event has been consumed.
	*/
	public static boolean dispatchKeyEvent(KeyEvent event) {
	if (!isGamepadEvent(event)) return false;
	return getInstance().handleKeyEvent(event);
	}

	private boolean handleKeyEvent(KeyEvent event) {
	synchronized (mLock) {
	if (!mIsGamepadAPIActive) return false;
	GamepadDevice gamepad = getGamepadForEvent(event);
	if (gamepad == null) return false;
	return gamepad.handleKeyEvent(event);
	}
	}

	/**
	* Handles motion events from the gamepad devices.
	* @return True if the event has been consumed.
	*/
	public static boolean onGenericMotionEvent(MotionEvent event) {
	if (!isGamepadEvent(event)) return false;
	return getInstance().handleMotionEvent(event);
	}

	private boolean handleMotionEvent(MotionEvent event) {
	synchronized (mLock) {
	if (!mIsGamepadAPIActive) return false;
	GamepadDevice gamepad = getGamepadForEvent(event);
	if (gamepad == null) return false;
	return gamepad.handleMotionEvent(event);
	}
	}

	private int getNextAvailableIndex() {
	// When multiple gamepads are connected to a user agent, indices must be assigned on a
	// first-come first-serve basis, starting at zero. If a gamepad is disconnected, previously
	// assigned indices must not be reassigned to gamepads that continue to be connected.
	// However, if a gamepad is disconnected, and subsequently the same or a different
	// gamepad is then connected, index entries must be reused.

	for (int i = 0; i < MAX_GAMEPADS; ++i) {
	if (getDevice(i) == null) {
	return i;
	}
	}
	// Reached maximum gamepads limit.
	return -1;
	}

	private boolean registerGamepad(InputDevice inputDevice) {
	int index = getNextAvailableIndex();
	if (index == -1) return false; // invalid index

	GamepadDevice gamepad = new GamepadDevice(index, inputDevice);
	mGamepadDevices[index] = gamepad;
	return true;
	}

	private void unregisterGamepad(int deviceId) {
	GamepadDevice gamepadDevice = getDeviceById(deviceId);
	if (gamepadDevice == null) return; // Not a registered device.
	int index = gamepadDevice.getIndex();
	mGamepadDevices[index] = null;
	}

	private static boolean isGamepadDevice(InputDevice inputDevice) {
	if (inputDevice == null) return false;
	return ((inputDevice.getSources() & InputDevice.SOURCE_JOYSTICK)
	== InputDevice.SOURCE_JOYSTICK);
	}

	private GamepadDevice getGamepadForEvent(InputEvent event) {
	return getDeviceById(event.getDeviceId());
	}

	/**
	* @return True if HTML5 gamepad API is active.
	*/
	public static boolean isGamepadAPIActive() {
	return getInstance().mIsGamepadAPIActive;
	}

	/**
	* @return True if the motion event corresponds to a gamepad event.
	*/
	public static boolean isGamepadEvent(MotionEvent event) {
	return ((event.getSource() & InputDevice.SOURCE_JOYSTICK) == InputDevice.SOURCE_JOYSTICK);
	}

	/**
	* @return True if event's keycode corresponds to a gamepad key.
	*/
	public static boolean isGamepadEvent(KeyEvent event) {
	int keyCode = event.getKeyCode();
	switch (keyCode) {
	// Specific handling for dpad keys is required because
	// KeyEvent.isGamepadButton doesn't consider dpad keys.
	case KeyEvent.KEYCODE_DPAD_UP:
	case KeyEvent.KEYCODE_DPAD_DOWN:
	case KeyEvent.KEYCODE_DPAD_LEFT:
	case KeyEvent.KEYCODE_DPAD_RIGHT:
	return true;
	default:
	return KeyEvent.isGamepadButton(keyCode);
	}
	}

	@CalledByNative
	static void updateGamepadData(long webGamepadsPtr) {
	getInstance().grabGamepadData(webGamepadsPtr);
	}

	private void grabGamepadData(long webGamepadsPtr) {
	synchronized (mLock) {
	for (int i = 0; i < MAX_GAMEPADS; i++) {
	final GamepadDevice device = getDevice(i);
	if (device != null) {
	device.updateButtonsAndAxesMapping();
	nativeSetGamepadData(webGamepadsPtr, i, device.isStandardGamepad(), true,
	device.getName(), device.getTimestamp(), device.getAxes(),
	device.getButtons());
	} else {
	nativeSetGamepadData(webGamepadsPtr, i, false, false, null, 0, null, null);
	}
	}
	}
	}

	@CalledByNative
	static void setGamepadAPIActive(boolean isActive) {
	getInstance().setIsGamepadActive(isActive);
	}

	private void setIsGamepadActive(boolean isGamepadActive) {
	synchronized (mLock) {
	mIsGamepadAPIActive = isGamepadActive;
	if (isGamepadActive) {
	for (int i = 0; i < MAX_GAMEPADS; i++) {
	GamepadDevice gamepadDevice = getDevice(i);
	if (gamepadDevice == null) continue;
	gamepadDevice.clearData();
	}
	}
	}
	}

	private native void nativeSetGamepadData(long webGamepadsPtr, int index, boolean mapping,
	boolean connected, String devicename, long timestamp, float[] axes, float[] buttons);

	private static class LazyHolder {
	private static final GamepadList INSTANCE = new GamepadList();
	}
	}