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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 import android.view.ViewGroup;
     23 
     24 /**
     25  * Adapter for the {@link ViewPager} for the contact detail page for a contact in 2 cases:
     26  * 1) without social updates, and 2) with social updates. The default initial case is for
     27  * the contact with social updates which uses all possible pages.
     28  */
     29 public class ContactDetailViewPagerAdapter extends PagerAdapter {
     30 
     31     public static final String ABOUT_FRAGMENT_TAG = "view-pager-about-fragment";
     32     public static final String UPDATES_FRAGMENT_TAG = "view-pager-updates-fragment";
     33 
     34     private static final int INDEX_ABOUT_FRAGMENT = 0;
     35     private static final int INDEX_UPDATES_FRAGMENT = 1;
     36 
     37     private static final int MAX_FRAGMENT_VIEW_COUNT = 2;
     38 
     39     /**
     40      * The initial value for the view count needs to be MAX_FRAGMENT_VIEW_COUNT,
     41      * otherwise anything smaller would break screen rotation functionality for a user viewing
     42      * a contact with social updates (i.e. the user was viewing the second page, rotates the
     43      * device, the view pager requires the second page to exist immediately on launch).
     44      */
     45     private int mFragmentViewCount = MAX_FRAGMENT_VIEW_COUNT;
     46 
     47     private View mAboutFragmentView;
     48     private View mUpdatesFragmentView;
     49 
     50     public ContactDetailViewPagerAdapter() {
     51     }
     52 
     53     public void setAboutFragmentView(View view) {
     54         mAboutFragmentView = view;
     55     }
     56 
     57     public void setUpdatesFragmentView(View view) {
     58         mUpdatesFragmentView = view;
     59     }
     60 
     61     /**
     62      * Enable swiping if the detail and update fragments should be showing. Otherwise diable
     63      * swiping if only the detail fragment should be showing.
     64      */
     65     public void enableSwipe(boolean enable) {
     66         mFragmentViewCount = enable ? MAX_FRAGMENT_VIEW_COUNT : 1;
     67         notifyDataSetChanged();
     68     }
     69 
     70     @Override
     71     public int getCount() {
     72         return mFragmentViewCount;
     73     }
     74 
     75     /** Gets called when the number of items changes. */
     76     @Override
     77     public int getItemPosition(Object object) {
     78         // Always return a valid index for the about fragment view because it's always shown
     79         // whether the contact has social updates or not.
     80         if (object == mAboutFragmentView) {
     81             return INDEX_ABOUT_FRAGMENT;
     82         }
     83         // Only return a valid index for the updates fragment view if our view count > 1.
     84         if (object == mUpdatesFragmentView && mFragmentViewCount > 1) {
     85             return INDEX_UPDATES_FRAGMENT;
     86         }
     87         // Otherwise the view should have no position.
     88         return POSITION_NONE;
     89     }
     90 
     91     @Override
     92     public void startUpdate(ViewGroup container) {
     93     }
     94 
     95     @Override
     96     public Object instantiateItem(ViewGroup container, int position) {
     97         switch (position) {
     98             case INDEX_ABOUT_FRAGMENT:
     99                 mAboutFragmentView.setVisibility(View.VISIBLE);
    100                 return mAboutFragmentView;
    101             case INDEX_UPDATES_FRAGMENT:
    102                 mUpdatesFragmentView.setVisibility(View.VISIBLE);
    103                 return mUpdatesFragmentView;
    104         }
    105         throw new IllegalArgumentException("Invalid position: " + position);
    106     }
    107 
    108     @Override
    109     public void destroyItem(ViewGroup container, int position, Object object) {
    110         ((View) object).setVisibility(View.GONE);
    111     }
    112 
    113     @Override
    114     public void finishUpdate(ViewGroup container) {
    115     }
    116 
    117     @Override
    118     public boolean isViewFromObject(View view, Object object) {
    119         return ((View) object) == view;
    120     }
    121 
    122     @Override
    123     public Parcelable saveState() {
    124         return null;
    125     }
    126 
    127     @Override
    128     public void restoreState(Parcelable state, ClassLoader loader) {
    129     }
    130 }
    131