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      1 /*
      2  * Copyright (C) 2017 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 package com.example.android.autofillframework.app;
     17 
     18 import android.content.Context;
     19 import android.support.annotation.Nullable;
     20 import android.util.AttributeSet;
     21 import android.util.Log;
     22 import android.view.GestureDetector;
     23 import android.view.MotionEvent;
     24 
     25 /**
     26  * A version of {@link CustomVirtualView} that uses gesture to provide scrolling.
     27  */
     28 public class ScrollableCustomVirtualView extends CustomVirtualView
     29         implements GestureDetector.OnGestureListener {
     30 
     31     private static final String TAG = "ScrollableCustomView";
     32 
     33     private GestureDetector mGestureDetector;
     34 
     35     public ScrollableCustomVirtualView(Context context) {
     36         this(context, null);
     37     }
     38 
     39     public ScrollableCustomVirtualView(Context context, AttributeSet attrs) {
     40         this(context, attrs, 0);
     41 
     42     }
     43 
     44     public ScrollableCustomVirtualView(Context context, @Nullable AttributeSet attrs,
     45             int defStyleAttr) {
     46         this(context, attrs, defStyleAttr, 0);
     47     }
     48 
     49     public ScrollableCustomVirtualView(Context context, @Nullable AttributeSet attrs,
     50             int defStyleAttr, int defStyleRes) {
     51         super(context, attrs, defStyleAttr, defStyleRes);
     52         mGestureDetector = new GestureDetector(context, this);
     53     }
     54 
     55     /**
     56      * Resets the UI to the intial state.
     57      */
     58     public void resetPositions() {
     59         super.resetCoordinates();
     60     }
     61 
     62     @Override
     63     public boolean onTouchEvent(MotionEvent event) {
     64         return mGestureDetector.onTouchEvent(event);
     65     }
     66 
     67     /*
     68      * Methods below implement GestureDetector.OnGestureListener
     69      */
     70     @Override
     71     public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
     72         if (VERBOSE) Log.v(TAG, "onScroll(): " + distanceX + " - " + distanceY);
     73         if (mFocusedLine != null) {
     74             mAutofillManager.notifyViewExited(this, mFocusedLine.mFieldTextItem.id);
     75         }
     76         mTopMargin -= distanceY;
     77         mLeftMargin -= distanceX;
     78         invalidate();
     79         return true;
     80     }
     81 
     82     @Override
     83     public boolean onDown(MotionEvent event) {
     84         onMotion((int) event.getY());
     85         return true;
     86     }
     87 
     88     @Override
     89     public void onShowPress(MotionEvent e) {
     90     }
     91 
     92     @Override
     93     public boolean onSingleTapUp(MotionEvent e) {
     94         return true;
     95     }
     96 
     97     @Override
     98     public void onLongPress(MotionEvent e) {
     99     }
    100 
    101     @Override
    102     public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
    103         return true;
    104     }
    105 }