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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();
+ }
+}