112 lines
3.7 KiB
Java
112 lines
3.7 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.latin;
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import com.android.inputmethod.latin.BaseKeyboard.Key;
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import java.util.Arrays;
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import java.util.List;
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abstract class KeyDetector {
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protected BaseKeyboard mKeyboard;
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private Key[] mKeys;
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protected int mCorrectionX;
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protected int mCorrectionY;
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protected boolean mProximityCorrectOn;
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protected int mProximityThresholdSquare;
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public Key[] setKeyboard(BaseKeyboard keyboard, float correctionX, float correctionY) {
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if (keyboard == null)
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throw new NullPointerException();
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mCorrectionX = (int)correctionX;
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mCorrectionY = (int)correctionY;
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mKeyboard = keyboard;
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List<Key> keys = mKeyboard.getKeys();
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Key[] array = keys.toArray(new Key[keys.size()]);
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mKeys = array;
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return array;
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}
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protected int getTouchX(int x) {
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return x + mCorrectionX;
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}
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protected int getTouchY(int y) {
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return y + mCorrectionY;
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}
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protected Key[] getKeys() {
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if (mKeys == null)
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throw new IllegalStateException("keyboard isn't set");
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// mKeyboard is guaranteed not to be null at setKeybaord() method if mKeys is not null
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return mKeys;
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}
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public void setProximityCorrectionEnabled(boolean enabled) {
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mProximityCorrectOn = enabled;
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}
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public boolean isProximityCorrectionEnabled() {
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return mProximityCorrectOn;
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}
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public void setProximityThreshold(int threshold) {
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mProximityThresholdSquare = threshold * threshold;
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}
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/**
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* Allocates array that can hold all key indices returned by {@link #getKeyIndexAndNearbyCodes}
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* method. The maximum size of the array should be computed by {@link #getMaxNearbyKeys}.
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*
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* @return Allocates and returns an array that can hold all key indices returned by
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* {@link #getKeyIndexAndNearbyCodes} method. All elements in the returned array are
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* initialized by {@link com.android.inputmethod.latin.LatinKeyboardView.NOT_A_KEY}
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* value.
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*/
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public int[] newCodeArray() {
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int[] codes = new int[getMaxNearbyKeys()];
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Arrays.fill(codes, BaseKeyboardView.NOT_A_KEY);
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return codes;
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}
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/**
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* Computes maximum size of the array that can contain all nearby key indices returned by
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* {@link #getKeyIndexAndNearbyCodes}.
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*
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* @return Returns maximum size of the array that can contain all nearby key indices returned
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* by {@link #getKeyIndexAndNearbyCodes}.
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*/
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abstract protected int getMaxNearbyKeys();
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/**
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* Finds all possible nearby key indices around a touch event point and returns the nearest key
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* index. The algorithm to determine the nearby keys depends on the threshold set by
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* {@link #setProximityThreshold(int)} and the mode set by
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* {@link #setProximityCorrectionEnabled(boolean)}.
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*
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* @param x The x-coordinate of a touch point
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* @param y The y-coordinate of a touch point
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* @param allKeys All nearby key indices are returned in this array
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* @return The nearest key index
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*/
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abstract public int getKeyIndexAndNearbyCodes(int x, int y, int[] allKeys);
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}
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