58 lines
2 KiB
Java
58 lines
2 KiB
Java
/*
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* Copyright (C) 2010 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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package com.android.inputmethod.keyboard;
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public class MiniKeyboardKeyDetector extends KeyDetector {
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private static final int MAX_NEARBY_KEYS = 1;
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private final int mSlideAllowanceSquare;
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private final int mSlideAllowanceSquareTop;
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public MiniKeyboardKeyDetector(float slideAllowance) {
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super();
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mSlideAllowanceSquare = (int)(slideAllowance * slideAllowance);
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// Top slide allowance is slightly longer (sqrt(2) times) than other edges.
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mSlideAllowanceSquareTop = mSlideAllowanceSquare * 2;
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}
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@Override
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protected int getMaxNearbyKeys() {
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return MAX_NEARBY_KEYS;
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}
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@Override
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public int getKeyIndexAndNearbyCodes(int x, int y, int[] allKeys) {
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final Key[] keys = getKeys();
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final int touchX = getTouchX(x);
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final int touchY = getTouchY(y);
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int closestKeyIndex = NOT_A_KEY;
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int closestKeyDist = (y < 0) ? mSlideAllowanceSquareTop : mSlideAllowanceSquare;
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final int keyCount = keys.length;
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for (int index = 0; index < keyCount; index++) {
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final int dist = keys[index].squaredDistanceToEdge(touchX, touchY);
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if (dist < closestKeyDist) {
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closestKeyIndex = index;
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closestKeyDist = dist;
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}
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}
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if (allKeys != null && closestKeyIndex != NOT_A_KEY)
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allKeys[0] = keys[closestKeyIndex].mCode;
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return closestKeyIndex;
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}
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}
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