/* * Copyright (C) 2010 Google Inc. * * 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.keyboard; public class MiniKeyboardKeyDetector extends KeyDetector { private static final int MAX_NEARBY_KEYS = 1; private final int mSlideAllowanceSquare; private final int mSlideAllowanceSquareTop; public MiniKeyboardKeyDetector(float slideAllowance) { super(); mSlideAllowanceSquare = (int)(slideAllowance * slideAllowance); // Top slide allowance is slightly longer (sqrt(2) times) than other edges. mSlideAllowanceSquareTop = mSlideAllowanceSquare * 2; } @Override protected int getMaxNearbyKeys() { return MAX_NEARBY_KEYS; } @Override public int getKeyIndexAndNearbyCodes(int x, int y, int[] allKeys) { final Key[] keys = getKeys(); final int touchX = getTouchX(x); final int touchY = getTouchY(y); int closestKeyIndex = NOT_A_KEY; int closestKeyDist = (y < 0) ? mSlideAllowanceSquareTop : mSlideAllowanceSquare; final int keyCount = keys.length; for (int index = 0; index < keyCount; index++) { final int dist = keys[index].squaredDistanceToEdge(touchX, touchY); if (dist < closestKeyDist) { closestKeyIndex = index; closestKeyDist = dist; } } if (allKeys != null && closestKeyIndex != NOT_A_KEY) allKeys[0] = keys[closestKeyIndex].mCodes[0]; return closestKeyIndex; } }