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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 org.kelar.inputmethod.event;
import android.view.KeyCharacterMap;
import android.view.KeyEvent;
import org.kelar.inputmethod.latin.common.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();
final boolean isKeyRepeat = (0 != keyEvent.getRepeatCount());
if (KeyEvent.KEYCODE_DEL == keyCode) {
return Event.createHardwareKeypressEvent(Event.NOT_A_CODE_POINT, Constants.CODE_DELETE,
null /* next */, isKeyRepeat);
}
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, keyCode,
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.
if (keyEvent.isShiftPressed()) {
return Event.createHardwareKeypressEvent(Event.NOT_A_CODE_POINT,
Constants.CODE_SHIFT_ENTER, null /* next */, isKeyRepeat);
}
return Event.createHardwareKeypressEvent(Constants.CODE_ENTER, keyCode,
null /* next */, isKeyRepeat);
}
// If not Enter, then this is just a regular keypress event for a normal character
// that can be committed right away, taking into account the current state.
return Event.createHardwareKeypressEvent(codePointAndFlags, keyCode, null /* next */,
isKeyRepeat);
}
return Event.createNotHandledEvent();
}
}
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