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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.InputDevice;
     22 import android.view.KeyEvent;
     23 import android.view.MotionEvent;
     24 import android.view.ScaleGestureDetector;
     25 
     26 import com.android.camera.debug.Log;
     27 
     28 // This class aggregates two gesture detectors: GestureDetector,
     29 // ScaleGestureDetector.
     30 public class FilmstripGestureRecognizer {
     31     @SuppressWarnings("unused")
     32     private static final Log.Tag TAG = new Log.Tag("FStripGestureRecog");
     33 
     34     public interface Listener {
     35         boolean onSingleTapUp(float x, float y);
     36         boolean onDoubleTap(float x, float y);
     37         boolean onScroll(float x, float y, float dx, float dy);
     38         boolean onMouseScroll(float hscroll, float vscroll);
     39         boolean onFling(float velocityX, float velocityY);
     40         boolean onScaleBegin(float focusX, float focusY);
     41         boolean onScale(float focusX, float focusY, float scale);
     42         boolean onDown(float x, float y);
     43         boolean onUp(float x, float y);
     44         void onLongPress(float x, float y);
     45         void onScaleEnd();
     46     }
     47 
     48     private final GestureDetector mGestureDetector;
     49     private final ScaleGestureDetector mScaleDetector;
     50     private final Listener mListener;
     51 
     52     public FilmstripGestureRecognizer(Context context, Listener listener) {
     53         mListener = listener;
     54         mGestureDetector = new GestureDetector(context, new MyGestureListener(),
     55                 null, true /* ignoreMultitouch */);
     56         mGestureDetector.setOnDoubleTapListener(new MyDoubleTapListener());
     57         mScaleDetector = new ScaleGestureDetector(
     58                 context, new MyScaleListener());
     59     }
     60 
     61     public boolean onTouchEvent(MotionEvent event) {
     62         final boolean gestureProcessed = mGestureDetector.onTouchEvent(event);
     63         final boolean scaleProcessed = mScaleDetector.onTouchEvent(event);
     64         if (event.getAction() == MotionEvent.ACTION_UP) {
     65             mListener.onUp(event.getX(), event.getY());
     66         }
     67         return (gestureProcessed | scaleProcessed);
     68     }
     69 
     70     public boolean onGenericMotionEvent(MotionEvent event) {
     71         if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) {
     72             switch (event.getAction()) {
     73                 case MotionEvent.ACTION_SCROLL: {
     74                     final float hscroll = event.getAxisValue(MotionEvent.AXIS_HSCROLL);
     75                     final float vscroll = -event.getAxisValue(MotionEvent.AXIS_VSCROLL);
     76 
     77                     if (hscroll != 0.0f || vscroll != 0.0f) {
     78                         mListener.onMouseScroll(hscroll, vscroll);
     79                     }
     80                 }
     81             }
     82         }
     83 
     84         return true;
     85     }
     86 
     87     private class MyGestureListener
     88                 extends GestureDetector.SimpleOnGestureListener {
     89         @Override
     90         public void onLongPress(MotionEvent e) {
     91             mListener.onLongPress(e.getX(), e.getY());
     92         }
     93 
     94         @Override
     95         public boolean onScroll(
     96                 MotionEvent e1, MotionEvent e2, float dx, float dy) {
     97             return mListener.onScroll(e2.getX(), e2.getY(), dx, dy);
     98         }
     99 
    100         @Override
    101         public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
    102                 float velocityY) {
    103             return mListener.onFling(velocityX, velocityY);
    104         }
    105 
    106         @Override
    107         public boolean onDown(MotionEvent e) {
    108             mListener.onDown(e.getX(), e.getY());
    109             return super.onDown(e);
    110         }
    111     }
    112 
    113     /**
    114      * The listener that is used to notify when a double-tap or a confirmed
    115      * single-tap occur.
    116      */
    117     private class MyDoubleTapListener implements GestureDetector.OnDoubleTapListener {
    118 
    119         @Override
    120         public boolean onSingleTapConfirmed(MotionEvent e) {
    121             return mListener.onSingleTapUp(e.getX(), e.getY());
    122         }
    123 
    124         @Override
    125         public boolean onDoubleTap(MotionEvent e) {
    126             return mListener.onDoubleTap(e.getX(), e.getY());
    127         }
    128 
    129         @Override
    130         public boolean onDoubleTapEvent(MotionEvent e) {
    131             return true;
    132         }
    133     }
    134 
    135     private class MyScaleListener
    136             extends ScaleGestureDetector.SimpleOnScaleGestureListener {
    137         @Override
    138         public boolean onScaleBegin(ScaleGestureDetector detector) {
    139             return mListener.onScaleBegin(
    140                     detector.getFocusX(), detector.getFocusY());
    141         }
    142 
    143         @Override
    144         public boolean onScale(ScaleGestureDetector detector) {
    145             return mListener.onScale(detector.getFocusX(),
    146                     detector.getFocusY(), detector.getScaleFactor());
    147         }
    148 
    149         @Override
    150         public void onScaleEnd(ScaleGestureDetector detector) {
    151             mListener.onScaleEnd();
    152         }
    153     }
    154 }
    155