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      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.camera.ui;
     18 
     19 import android.content.Context;
     20 import android.view.GestureDetector;
     21 import android.view.MotionEvent;
     22 import android.view.ScaleGestureDetector;
     23 
     24 import com.android.camera.debug.Log;
     25 
     26 // This class aggregates two gesture detectors: GestureDetector,
     27 // ScaleGestureDetector.
     28 public class FilmstripGestureRecognizer {
     29     @SuppressWarnings("unused")
     30     private static final Log.Tag TAG = new Log.Tag("FStripGestureRecog");
     31 
     32     public interface Listener {
     33         boolean onSingleTapUp(float x, float y);
     34         boolean onDoubleTap(float x, float y);
     35         boolean onScroll(float x, float y, float dx, float dy);
     36         boolean onFling(float velocityX, float velocityY);
     37         boolean onScaleBegin(float focusX, float focusY);
     38         boolean onScale(float focusX, float focusY, float scale);
     39         boolean onDown(float x, float y);
     40         boolean onUp(float x, float y);
     41         void onLongPress(float x, float y);
     42         void onScaleEnd();
     43     }
     44 
     45     private final GestureDetector mGestureDetector;
     46     private final ScaleGestureDetector mScaleDetector;
     47     private final Listener mListener;
     48 
     49     public FilmstripGestureRecognizer(Context context, Listener listener) {
     50         mListener = listener;
     51         mGestureDetector = new GestureDetector(context, new MyGestureListener(),
     52                 null, true /* ignoreMultitouch */);
     53         mGestureDetector.setOnDoubleTapListener(new MyDoubleTapListener());
     54         mScaleDetector = new ScaleGestureDetector(
     55                 context, new MyScaleListener());
     56     }
     57 
     58     public boolean onTouchEvent(MotionEvent event) {
     59         final boolean gestureProcessed = mGestureDetector.onTouchEvent(event);
     60         final boolean scaleProcessed = mScaleDetector.onTouchEvent(event);
     61         if (event.getAction() == MotionEvent.ACTION_UP) {
     62             mListener.onUp(event.getX(), event.getY());
     63         }
     64         return (gestureProcessed | scaleProcessed);
     65     }
     66 
     67     private class MyGestureListener
     68                 extends GestureDetector.SimpleOnGestureListener {
     69         @Override
     70         public void onLongPress(MotionEvent e) {
     71             mListener.onLongPress(e.getX(), e.getY());
     72         }
     73 
     74         @Override
     75         public boolean onScroll(
     76                 MotionEvent e1, MotionEvent e2, float dx, float dy) {
     77             return mListener.onScroll(e2.getX(), e2.getY(), dx, dy);
     78         }
     79 
     80         @Override
     81         public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
     82                 float velocityY) {
     83             return mListener.onFling(velocityX, velocityY);
     84         }
     85 
     86         @Override
     87         public boolean onDown(MotionEvent e) {
     88             mListener.onDown(e.getX(), e.getY());
     89             return super.onDown(e);
     90         }
     91     }
     92 
     93     /**
     94      * The listener that is used to notify when a double-tap or a confirmed
     95      * single-tap occur.
     96      */
     97     private class MyDoubleTapListener implements GestureDetector.OnDoubleTapListener {
     98 
     99         @Override
    100         public boolean onSingleTapConfirmed(MotionEvent e) {
    101             return mListener.onSingleTapUp(e.getX(), e.getY());
    102         }
    103 
    104         @Override
    105         public boolean onDoubleTap(MotionEvent e) {
    106             return mListener.onDoubleTap(e.getX(), e.getY());
    107         }
    108 
    109         @Override
    110         public boolean onDoubleTapEvent(MotionEvent e) {
    111             return true;
    112         }
    113     }
    114 
    115     private class MyScaleListener
    116             extends ScaleGestureDetector.SimpleOnScaleGestureListener {
    117         @Override
    118         public boolean onScaleBegin(ScaleGestureDetector detector) {
    119             return mListener.onScaleBegin(
    120                     detector.getFocusX(), detector.getFocusY());
    121         }
    122 
    123         @Override
    124         public boolean onScale(ScaleGestureDetector detector) {
    125             return mListener.onScale(detector.getFocusX(),
    126                     detector.getFocusY(), detector.getScaleFactor());
    127         }
    128 
    129         @Override
    130         public void onScaleEnd(ScaleGestureDetector detector) {
    131             mListener.onScaleEnd();
    132         }
    133     }
    134 }
    135