60 lines
2.1 KiB
Java
60 lines
2.1 KiB
Java
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/*
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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.latin;
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import android.inputmethodservice.Keyboard.Key;
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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 closestKey = LatinKeyboardBaseView.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 i = 0; i < keyCount; i++) {
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final Key key = keys[i];
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int dist = key.squaredDistanceFrom(touchX, touchY);
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if (dist < closestKeyDist) {
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closestKey = i;
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closestKeyDist = dist;
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}
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}
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if (allKeys != null && closestKey != LatinKeyboardBaseView.NOT_A_KEY)
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allKeys[0] = closestKey;
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return closestKey;
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}
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}
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