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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.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;
}
}
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