1 /* 2 * Copyright (C) 2010 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not 5 * use this file except in compliance with the License. You may obtain a copy of 6 * the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 13 * License for the specific language governing permissions and limitations under 14 * the License. 15 */ 16 17 package com.android.inputmethod.latin; 18 19 import android.inputmethodservice.Keyboard.Key; 20 21 class MiniKeyboardKeyDetector extends KeyDetector { 22 private static final int MAX_NEARBY_KEYS = 1; 23 24 private final int mSlideAllowanceSquare; 25 private final int mSlideAllowanceSquareTop; 26 MiniKeyboardKeyDetector(float slideAllowance)27 public MiniKeyboardKeyDetector(float slideAllowance) { 28 super(); 29 mSlideAllowanceSquare = (int)(slideAllowance * slideAllowance); 30 // Top slide allowance is slightly longer (sqrt(2) times) than other edges. 31 mSlideAllowanceSquareTop = mSlideAllowanceSquare * 2; 32 } 33 34 @Override getMaxNearbyKeys()35 protected int getMaxNearbyKeys() { 36 return MAX_NEARBY_KEYS; 37 } 38 39 @Override getKeyIndexAndNearbyCodes(int x, int y, int[] allKeys)40 public int getKeyIndexAndNearbyCodes(int x, int y, int[] allKeys) { 41 final Key[] keys = getKeys(); 42 final int touchX = getTouchX(x); 43 final int touchY = getTouchY(y); 44 int closestKeyIndex = LatinKeyboardBaseView.NOT_A_KEY; 45 int closestKeyDist = (y < 0) ? mSlideAllowanceSquareTop : mSlideAllowanceSquare; 46 final int keyCount = keys.length; 47 for (int i = 0; i < keyCount; i++) { 48 final Key key = keys[i]; 49 int dist = key.squaredDistanceFrom(touchX, touchY); 50 if (dist < closestKeyDist) { 51 closestKeyIndex = i; 52 closestKeyDist = dist; 53 } 54 } 55 if (allKeys != null && closestKeyIndex != LatinKeyboardBaseView.NOT_A_KEY) 56 allKeys[0] = keys[closestKeyIndex].codes[0]; 57 return closestKeyIndex; 58 } 59 } 60