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/*
* 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;
import java.util.Arrays;
public 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 = NOT_A_KEY;
final int[] distances = mDistances;
Arrays.fill(distances, Integer.MAX_VALUE);
for (final int index : mKeyboard.getNearestKeys(touchX, touchY)) {
final Key key = keys[index];
final boolean isInside = key.isInside(touchX, touchY);
if (isInside)
primaryIndex = index;
final int dist = key.squaredDistanceToEdge(touchX, touchY);
if (isInside || (mProximityCorrectOn && dist < mProximityThresholdSquare)) {
if (allKeys == null) continue;
// Find insertion point
for (int j = 0; j < distances.length; j++) {
if (distances[j] > dist) {
final int nextPos = j + 1;
System.arraycopy(distances, j, distances, nextPos,
distances.length - nextPos);
System.arraycopy(allKeys, j, allKeys, nextPos,
allKeys.length - nextPos);
distances[j] = dist;
allKeys[j] = key.mCode;
break;
}
}
}
}
return primaryIndex;
}
}
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