| /* |
| * Copyright (C) 2010 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.gallery3d.ui; |
| |
| import android.view.MotionEvent; |
| |
| public class DownUpDetector { |
| public interface DownUpListener { |
| void onDown(MotionEvent e); |
| void onUp(MotionEvent e); |
| } |
| |
| private boolean mStillDown; |
| private DownUpListener mListener; |
| |
| public DownUpDetector(DownUpListener listener) { |
| mListener = listener; |
| } |
| |
| private void setState(boolean down, MotionEvent e) { |
| if (down == mStillDown) return; |
| mStillDown = down; |
| if (down) { |
| mListener.onDown(e); |
| } else { |
| mListener.onUp(e); |
| } |
| } |
| |
| public void onTouchEvent(MotionEvent ev) { |
| switch (ev.getAction() & MotionEvent.ACTION_MASK) { |
| case MotionEvent.ACTION_DOWN: |
| setState(true, ev); |
| break; |
| |
| case MotionEvent.ACTION_UP: |
| case MotionEvent.ACTION_CANCEL: |
| case MotionEvent.ACTION_POINTER_DOWN: // Multitouch event - abort. |
| setState(false, ev); |
| break; |
| } |
| } |
| |
| public boolean isDown() { |
| return mStillDown; |
| } |
| } |