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/*
* 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 */);
} else {
// A committable character. This should be committed right away, taking into
// account the current state.
return Event.createCommittableEvent(codePointAndFlags, null /* next */);
}
} else {
return Event.createNotHandledEvent();
}
}
}
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