| /* |
| * Copyright (C) 2012 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. |
| */ |
| |
| package com.android.inputmethod.event; |
| |
| import android.view.KeyCharacterMap; |
| import android.view.KeyEvent; |
| |
| import com.android.inputmethod.latin.Constants; |
| |
| /** |
| * A hardware event decoder for a hardware qwerty-ish keyboard. |
| * |
| * The events are always hardware keypresses, but they can be key down or key up events, they |
| * can be dead keys, they can be meta keys like shift or ctrl... This does not deal with |
| * 10-key like keyboards; a different decoder is used for this. |
| */ |
| public class HardwareKeyboardEventDecoder implements HardwareEventDecoder { |
| final int mDeviceId; |
| |
| public HardwareKeyboardEventDecoder(final int deviceId) { |
| mDeviceId = deviceId; |
| // TODO: get the layout for this hardware keyboard |
| } |
| |
| @Override |
| public Event decodeHardwareKey(final KeyEvent keyEvent) { |
| // KeyEvent#getUnicodeChar() does not exactly returns a unicode char, but rather a value |
| // that includes both the unicode char in the lower 21 bits and flags in the upper bits, |
| // hence the name "codePointAndFlags". {@see KeyEvent#getUnicodeChar()} for more info. |
| final int codePointAndFlags = keyEvent.getUnicodeChar(); |
| // The keyCode is the abstraction used by the KeyEvent to represent different keys that |
| // do not necessarily map to a unicode character. This represents a physical key, like |
| // the key for 'A' or Space, but also Backspace or Ctrl or Caps Lock. |
| final int keyCode = keyEvent.getKeyCode(); |
| if (KeyEvent.KEYCODE_DEL == keyCode) { |
| return Event.createCommittableEvent(Constants.CODE_DELETE, null /* next */); |
| } |
| if (keyEvent.isPrintingKey() || KeyEvent.KEYCODE_SPACE == keyCode |
| || KeyEvent.KEYCODE_ENTER == keyCode) { |
| if (0 != (codePointAndFlags & KeyCharacterMap.COMBINING_ACCENT)) { |
| // A dead key. |
| return Event.createDeadEvent( |
| codePointAndFlags & KeyCharacterMap.COMBINING_ACCENT_MASK, null /* next */); |
| } |
| if (KeyEvent.KEYCODE_ENTER == keyCode) { |
| // The Enter key. If the Shift key is not being pressed, this should send a |
| // CODE_ENTER to trigger the action if any, or a carriage return otherwise. If the |
| // Shift key is being pressed, this should send a CODE_SHIFT_ENTER and let |
| // Latin IME decide what to do with it. |
| return Event.createCommittableEvent(keyEvent.isShiftPressed() |
| ? Constants.CODE_SHIFT_ENTER : Constants.CODE_ENTER, |
| null /* next */); |
| } |
| // If not Enter, then we have a committable character. This should be committed |
| // right away, taking into account the current state. |
| return Event.createCommittableEvent(codePointAndFlags, null /* next */); |
| } |
| return Event.createNotHandledEvent(); |
| } |
| } |