LatinIME/java/src/com/android/inputmethod/keyboard/MoreKeysDetector.java

52 lines
1.7 KiB
Java

/*
* Copyright (C) 2011 The Android Open Source Project
*
* 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.keyboard;
public class MoreKeysDetector extends KeyDetector {
private final int mSlideAllowanceSquare;
private final int mSlideAllowanceSquareTop;
public MoreKeysDetector(float slideAllowance) {
super(/* keyHysteresisDistance */0);
mSlideAllowanceSquare = (int)(slideAllowance * slideAllowance);
// Top slide allowance is slightly longer (sqrt(2) times) than other edges.
mSlideAllowanceSquareTop = mSlideAllowanceSquare * 2;
}
@Override
public boolean alwaysAllowsSlidingInput() {
return true;
}
@Override
public Key detectHitKey(int x, int y) {
final int touchX = getTouchX(x);
final int touchY = getTouchY(y);
Key nearestKey = null;
int nearestDist = (y < 0) ? mSlideAllowanceSquareTop : mSlideAllowanceSquare;
for (final Key key : getKeyboard().mKeys) {
final int dist = key.squaredDistanceToEdge(touchX, touchY);
if (dist < nearestDist) {
nearestKey = key;
nearestDist = dist;
}
}
return nearestKey;
}
}