119 lines
3.8 KiB
Java
119 lines
3.8 KiB
Java
/*
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* Copyright (C) 2010 The Android Open Source Project
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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.keyboard;
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public class KeyDetector {
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public static final int NOT_A_CODE = -1;
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private final int mKeyHysteresisDistanceSquared;
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private Keyboard mKeyboard;
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private int mCorrectionX;
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private int mCorrectionY;
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private boolean mProximityCorrectOn;
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/**
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* This class handles key detection.
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*
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* @param keyHysteresisDistance if the pointer movement distance is smaller than this, the
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* movement will not been handled as meaningful movement. The unit is pixel.
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*/
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public KeyDetector(float keyHysteresisDistance) {
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mKeyHysteresisDistanceSquared = (int)(keyHysteresisDistance * keyHysteresisDistance);
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}
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public void setKeyboard(Keyboard 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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}
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public int getKeyHysteresisDistanceSquared() {
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return mKeyHysteresisDistanceSquared;
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}
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public int getTouchX(int x) {
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return x + mCorrectionX;
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}
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public int getTouchY(int y) {
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return y + mCorrectionY;
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}
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public Keyboard getKeyboard() {
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if (mKeyboard == null)
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throw new IllegalStateException("keyboard isn't set");
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return mKeyboard;
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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 boolean alwaysAllowsSlidingInput() {
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return false;
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}
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/**
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* Detect the key whose hitbox the touch point is in.
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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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* @return the key that the touch point hits.
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*/
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public Key detectHitKey(int x, int y) {
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final int touchX = getTouchX(x);
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final int touchY = getTouchY(y);
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int minDistance = Integer.MAX_VALUE;
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Key primaryKey = null;
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for (final Key key: mKeyboard.getNearestKeys(touchX, touchY)) {
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final boolean isOnKey = key.isOnKey(touchX, touchY);
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final int distance = key.squaredDistanceToEdge(touchX, touchY);
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// To take care of hitbox overlaps, we compare mCode here too.
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if (primaryKey == null || distance < minDistance
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|| (distance == minDistance && isOnKey && key.mCode > primaryKey.mCode)) {
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minDistance = distance;
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primaryKey = key;
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}
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}
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return primaryKey;
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}
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public static String printableCode(Key key) {
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return key != null ? Keyboard.printableCode(key.mCode) : "none";
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}
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public static String printableCodes(int[] codes) {
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final StringBuilder sb = new StringBuilder();
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boolean addDelimiter = false;
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for (final int code : codes) {
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if (code == NOT_A_CODE) break;
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if (addDelimiter) sb.append(", ");
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sb.append(Keyboard.printableCode(code));
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addDelimiter = true;
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}
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return "[" + sb + "]";
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}
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}
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