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diff --git a/java/src/com/android/inputmethod/event/HardwareKeyboardEventDecoder.java b/java/src/com/android/inputmethod/event/HardwareKeyboardEventDecoder.java
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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) {
+ 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;
+ }
+}