55 lines
1.9 KiB
Java
55 lines
1.9 KiB
Java
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of 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,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.inputmethod.keyboard;
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public final class MoreKeysDetector extends KeyDetector {
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private final int mSlideAllowanceSquare;
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private final int mSlideAllowanceSquareTop;
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public MoreKeysDetector(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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public boolean alwaysAllowsKeySelectionByDraggingFinger() {
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return true;
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}
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@Override
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public Key detectHitKey(final int x, final int y) {
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final Keyboard keyboard = getKeyboard();
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if (keyboard == null) {
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return null;
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}
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final int touchX = getTouchX(x);
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final int touchY = getTouchY(y);
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Key nearestKey = null;
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int nearestDist = (y < 0) ? mSlideAllowanceSquareTop : mSlideAllowanceSquare;
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for (final Key key : keyboard.getSortedKeys()) {
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final int dist = key.squaredDistanceToEdge(touchX, touchY);
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if (dist < nearestDist) {
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nearestKey = key;
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nearestDist = dist;
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}
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}
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return nearestKey;
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}
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}
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