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      1 /*
      2  * Copyright (C) 2015 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.android.messaging.ui;
     17 
     18 import android.content.Context;
     19 import android.support.v4.view.PagerAdapter;
     20 import android.support.v4.view.ViewPager;
     21 import android.util.AttributeSet;
     22 import android.view.MotionEvent;
     23 
     24 import com.android.messaging.util.UiUtils;
     25 
     26 /**
     27  * A simple extension on the standard ViewPager which lets you turn paging on/off.
     28  */
     29 public class PagingAwareViewPager extends ViewPager {
     30     private boolean mPagingEnabled = true;
     31 
     32     public PagingAwareViewPager(Context context, AttributeSet attrs) {
     33         super(context, attrs);
     34     }
     35 
     36     @Override
     37     public void setCurrentItem(int item, boolean smoothScroll) {
     38         super.setCurrentItem(getRtlPosition(item), smoothScroll);
     39     }
     40 
     41     @Override
     42     public void setCurrentItem(int item) {
     43         super.setCurrentItem(getRtlPosition(item));
     44     }
     45 
     46     @Override
     47     public int getCurrentItem() {
     48         int position = super.getCurrentItem();
     49         return getRtlPosition(position);
     50     }
     51 
     52     /**
     53      * Switches position in pager to be adjusted for if we are in RtL mode
     54      *
     55      * @param position
     56      * @return position adjusted if in rtl mode
     57      */
     58     protected int getRtlPosition(final int position) {
     59         final PagerAdapter adapter = getAdapter();
     60         if (adapter != null && UiUtils.isRtlMode()) {
     61             return adapter.getCount() - 1 - position;
     62         }
     63         return position;
     64     }
     65 
     66     @Override
     67     public boolean onTouchEvent(final MotionEvent event) {
     68         if (!mPagingEnabled) {
     69             return false;
     70         }
     71         return super.onTouchEvent(event);
     72     }
     73 
     74     @Override
     75     public boolean onInterceptTouchEvent(final MotionEvent event) {
     76         if (!mPagingEnabled) {
     77             return false;
     78         }
     79         return super.onInterceptTouchEvent(event);
     80     }
     81 
     82     public void setPagingEnabled(final boolean enabled) {
     83         this.mPagingEnabled = enabled;
     84     }
     85 
     86     /** This prevents touch-less scrolling eg. while doing accessibility navigation. */
     87     @Override
     88     public boolean canScrollHorizontally(int direction) {
     89         if (mPagingEnabled) {
     90             return super.canScrollHorizontally(direction);
     91         } else {
     92             return false;
     93         }
     94     }
     95 }
     96