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      1 /*
      2  * Copyright (C) 2011 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.contacts.detail;
     17 
     18 import android.os.Parcelable;
     19 import android.support.v4.view.PagerAdapter;
     20 import android.support.v4.view.ViewPager;
     21 import android.view.View;
     22 
     23 /**
     24  * Adapter for the {@link ViewPager} for the contact detail page for a contact in 2 cases:
     25  * 1) without social updates, and 2) with social updates. The default initial case is for
     26  * the contact with social updates which uses all possible pages.
     27  */
     28 public class ContactDetailViewPagerAdapter extends PagerAdapter {
     29 
     30     public static final String ABOUT_FRAGMENT_TAG = "view-pager-about-fragment";
     31     public static final String UPDTES_FRAGMENT_TAG = "view-pager-updates-fragment";
     32 
     33     private static final int INDEX_ABOUT_FRAGMENT = 0;
     34     private static final int INDEX_UPDATES_FRAGMENT = 1;
     35 
     36     private static final int MAX_FRAGMENT_VIEW_COUNT = 2;
     37 
     38     /**
     39      * The initial value for the view count needs to be MAX_FRAGMENT_VIEW_COUNT,
     40      * otherwise anything smaller would break screen rotation functionality for a user viewing
     41      * a contact with social updates (i.e. the user was viewing the second page, rotates the
     42      * device, the view pager requires the second page to exist immediately on launch).
     43      */
     44     private int mFragmentViewCount = MAX_FRAGMENT_VIEW_COUNT;
     45 
     46     private View mAboutFragmentView;
     47     private View mUpdatesFragmentView;
     48 
     49     public ContactDetailViewPagerAdapter() {
     50     }
     51 
     52     public void setAboutFragmentView(View view) {
     53         mAboutFragmentView = view;
     54     }
     55 
     56     public void setUpdatesFragmentView(View view) {
     57         mUpdatesFragmentView = view;
     58     }
     59 
     60     /**
     61      * Enable swiping if the detail and update fragments should be showing. Otherwise diable
     62      * swiping if only the detail fragment should be showing.
     63      */
     64     public void enableSwipe(boolean enable) {
     65         mFragmentViewCount = enable ? MAX_FRAGMENT_VIEW_COUNT : 1;
     66         notifyDataSetChanged();
     67     }
     68 
     69     @Override
     70     public int getCount() {
     71         return mFragmentViewCount;
     72     }
     73 
     74     /** Gets called when the number of items changes. */
     75     @Override
     76     public int getItemPosition(Object object) {
     77         // Always return a valid index for the about fragment view because it's always shown
     78         // whether the contact has social updates or not.
     79         if (object == mAboutFragmentView) {
     80             return INDEX_ABOUT_FRAGMENT;
     81         }
     82         // Only return a valid index for the updates fragment view if our view count > 1.
     83         if (object == mUpdatesFragmentView && mFragmentViewCount > 1) {
     84             return INDEX_UPDATES_FRAGMENT;
     85         }
     86         // Otherwise the view should have no position.
     87         return POSITION_NONE;
     88     }
     89 
     90     @Override
     91     public void startUpdate(View container) {
     92     }
     93 
     94     @Override
     95     public Object instantiateItem(View container, int position) {
     96         switch (position) {
     97             case INDEX_ABOUT_FRAGMENT:
     98                 mAboutFragmentView.setVisibility(View.VISIBLE);
     99                 return mAboutFragmentView;
    100             case INDEX_UPDATES_FRAGMENT:
    101                 mUpdatesFragmentView.setVisibility(View.VISIBLE);
    102                 return mUpdatesFragmentView;
    103         }
    104         throw new IllegalArgumentException("Invalid position: " + position);
    105     }
    106 
    107     @Override
    108     public void destroyItem(View container, int position, Object object) {
    109         ((View) object).setVisibility(View.GONE);
    110     }
    111 
    112     @Override
    113     public void finishUpdate(View container) {
    114     }
    115 
    116     @Override
    117     public boolean isViewFromObject(View view, Object object) {
    118         return ((View) object) == view;
    119     }
    120 
    121     @Override
    122     public Parcelable saveState() {
    123         return null;
    124     }
    125 
    126     @Override
    127     public void restoreState(Parcelable state, ClassLoader loader) {
    128     }
    129 }
    130