/ime/latinime/src/com/googlecode/eyesfree/inputmethod/latin/ProximityKeyDetector.java
http://eyes-free.googlecode.com/ · Java · 86 lines · 58 code · 10 blank · 18 comment · 13 complexity · 62e39930e913544ec7b4bffe96779be9 MD5 · raw file
- /*
- * 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.googlecode.eyesfree.inputmethod.latin;
- import android.inputmethodservice.Keyboard.Key;
- import java.util.Arrays;
- class ProximityKeyDetector extends KeyDetector {
- private static final int MAX_NEARBY_KEYS = 12;
- // working area
- private int[] mDistances = new int[MAX_NEARBY_KEYS];
- @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 primaryIndex = LatinKeyboardBaseView.NOT_A_KEY;
- int closestKey = LatinKeyboardBaseView.NOT_A_KEY;
- int closestKeyDist = mProximityThresholdSquare + 1;
- int[] distances = mDistances;
- Arrays.fill(distances, Integer.MAX_VALUE);
- int [] nearestKeyIndices = mKeyboard.getNearestKeys(touchX, touchY);
- final int keyCount = nearestKeyIndices.length;
- for (int i = 0; i < keyCount; i++) {
- final Key key = keys[nearestKeyIndices[i]];
- int dist = 0;
- boolean isInside = key.isInside(touchX, touchY);
- if (isInside) {
- primaryIndex = nearestKeyIndices[i];
- }
- if (((mProximityCorrectOn
- && (dist = key.squaredDistanceFrom(touchX, touchY)) < mProximityThresholdSquare)
- || isInside)
- && key.codes[0] > 32) {
- // Find insertion point
- final int nCodes = key.codes.length;
- if (dist < closestKeyDist) {
- closestKeyDist = dist;
- closestKey = nearestKeyIndices[i];
- }
- if (allKeys == null) continue;
- for (int j = 0; j < distances.length; j++) {
- if (distances[j] > dist) {
- // Make space for nCodes codes
- System.arraycopy(distances, j, distances, j + nCodes,
- distances.length - j - nCodes);
- System.arraycopy(allKeys, j, allKeys, j + nCodes,
- allKeys.length - j - nCodes);
- System.arraycopy(key.codes, 0, allKeys, j, nCodes);
- Arrays.fill(distances, j, j + nCodes, dist);
- break;
- }
- }
- }
- }
- if (primaryIndex == LatinKeyboardBaseView.NOT_A_KEY) {
- primaryIndex = closestKey;
- }
- return primaryIndex;
- }
- }