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Diffstat (limited to 'java/src/com/android/inputmethod/event/HardwareKeyboardEventDecoder.java')
-rw-r--r-- | java/src/com/android/inputmethod/event/HardwareKeyboardEventDecoder.java | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/java/src/com/android/inputmethod/event/HardwareKeyboardEventDecoder.java b/java/src/com/android/inputmethod/event/HardwareKeyboardEventDecoder.java new file mode 100644 index 000000000..2dbc9f00b --- /dev/null +++ b/java/src/com/android/inputmethod/event/HardwareKeyboardEventDecoder.java @@ -0,0 +1,69 @@ +/* + * 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) { + final Event event = Event.obtainEvent(); + // 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) { + event.setCommittableEvent(Constants.CODE_DELETE); + return event; + } + if (keyEvent.isPrintingKey() || KeyEvent.KEYCODE_SPACE == keyCode + || KeyEvent.KEYCODE_ENTER == keyCode) { + if (0 != (codePointAndFlags & KeyCharacterMap.COMBINING_ACCENT)) { + // A dead key. + event.setDeadEvent(codePointAndFlags & KeyCharacterMap.COMBINING_ACCENT_MASK); + } else { + // A committable character. This should be committed right away, taking into + // account the current state. + event.setCommittableEvent(codePointAndFlags); + } + } else { + event.setNotHandledEvent(); + } + return event; + } +} |