1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of 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, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.inputmethod.keyboard; 18 19 public final class MoreKeysDetector extends KeyDetector { 20 private final int mSlideAllowanceSquare; 21 private final int mSlideAllowanceSquareTop; 22 23 public MoreKeysDetector(float slideAllowance) { 24 super(); 25 mSlideAllowanceSquare = (int)(slideAllowance * slideAllowance); 26 // Top slide allowance is slightly longer (sqrt(2) times) than other edges. 27 mSlideAllowanceSquareTop = mSlideAllowanceSquare * 2; 28 } 29 30 @Override 31 public boolean alwaysAllowsKeySelectionByDraggingFinger() { 32 return true; 33 } 34 35 @Override 36 public Key detectHitKey(final int x, final int y) { 37 final Keyboard keyboard = getKeyboard(); 38 if (keyboard == null) { 39 return null; 40 } 41 final int touchX = getTouchX(x); 42 final int touchY = getTouchY(y); 43 44 Key nearestKey = null; 45 int nearestDist = (y < 0) ? mSlideAllowanceSquareTop : mSlideAllowanceSquare; 46 for (final Key key : keyboard.getSortedKeys()) { 47 final int dist = key.squaredDistanceToEdge(touchX, touchY); 48 if (dist < nearestDist) { 49 nearestKey = key; 50 nearestDist = dist; 51 } 52 } 53 return nearestKey; 54 } 55 } 56
