src/com/owncloud/android/ui/fragment/ExtendedListFragment.java

   1 /* ownCloud Android client application
   2  *   Copyright (C) 2012 Bartek Przybylski
   3  *   Copyright (C) 2012-2013 ownCloud Inc.
   4  *
   5  *   This program is free software: you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License version 2,
   7  *   as published by the Free Software Foundation.
   8  *
   9  *   This program is distributed in the hope that it will be useful,
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *   GNU General Public License for more details.
  13  *
  14  *   You should have received a copy of the GNU General Public License
  15  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  *
  17  */
  18
  19 package com.owncloud.android.ui.fragment;
  20
  21 import com.actionbarsherlock.app.SherlockFragment;
  22 import com.owncloud.android.R;
  23 import com.owncloud.android.ui.ExtendedListView;
  24 import com.owncloud.android.utils.Log_OC;
  25
  26
  27 import android.os.Bundle;
  28 import android.support.v4.widget.SwipeRefreshLayout;
  29 import android.view.LayoutInflater;
  30 import android.view.View;
  31 import android.view.ViewGroup;
  32 import android.widget.AdapterView;
  33 import android.widget.ListAdapter;
  34 import android.widget.AdapterView.OnItemClickListener;
  35 import android.widget.ListView;
  36
  37 /**
  38  *  TODO extending SherlockListFragment instead of SherlockFragment
  39  */
  40 public class ExtendedListFragment extends SherlockFragment implements OnItemClickListener, SwipeRefreshLayout.OnRefreshListener{
  41
  42     private static final String TAG = ExtendedListFragment.class.getSimpleName();
  43
  44     private static final String KEY_SAVED_LIST_POSITION = "SAVED_LIST_POSITION";
  45
  46     protected ExtendedListView mList;
  47
  48     private SwipeRefreshLayout mRefreshLayout;
  49
  50     public void setListAdapter(ListAdapter listAdapter) {
  51         mList.setAdapter(listAdapter);
  52         mList.invalidate();
  53     }
  54
  55     public ListView getListView() {
  56         return mList;
  57     }
  58
  59
  60     @Override
  61     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
  62         Log_OC.e(TAG, "onCreateView");
  63         //mList = new ExtendedListView(getActivity());
  64
  65         View v = inflater.inflate(R.layout.list_fragment, null);
  66         mList = (ExtendedListView)(v.findViewById(R.id.list_root));
  67         mList.setOnItemClickListener(this);
  68         //mList.setEmptyView(v.findViewById(R.id.empty_list_view));     // looks like it's not a cool idea
  69         mList.setDivider(getResources().getDrawable(R.drawable.uploader_list_separator));
  70         mList.setDividerHeight(1);
  71
  72         if (savedInstanceState != null) {
  73             int referencePosition = savedInstanceState.getInt(KEY_SAVED_LIST_POSITION);
  74             setReferencePosition(referencePosition);
  75         }
  76
  77         // Pull down refresh
  78         mRefreshLayout = (SwipeRefreshLayout) v.findViewById(R.id.swipe_refresh_files);
  79         // Colors in animations: background
  80         mRefreshLayout.setColorScheme(R.color.background_color, R.color.background_color,
  81                  R.color.background_color, R.color.background_color);
  82
  83         mRefreshLayout.setOnRefreshListener(this);
  84
  85         return v;
  86     }
  87
  88
  89     @Override
  90     public void onSaveInstanceState(Bundle savedInstanceState) {
  91         super.onSaveInstanceState(savedInstanceState);
  92         Log_OC.e(TAG, "onSaveInstanceState()");
  93         savedInstanceState.putInt(KEY_SAVED_LIST_POSITION, getReferencePosition());
  94     }
  95
  96
  97     /**
  98      * Calculates the position of the item that will be used as a reference to reposition the visible items in the list when
  99      * the device is turned to other position.
 100      *
 101      * THe current policy is take as a reference the visible item in the center of the screen.
 102      *
 103      * @return      The position in the list of the visible item in the center of the screen.
 104      */
 105     protected int getReferencePosition() {
 106         if (mList != null) {
 107             return (mList.getFirstVisiblePosition() + mList.getLastVisiblePosition()) / 2;
 108         } else {
 109             return 0;
 110         }
 111     }
 112
 113
 114     /**
 115      * Sets the visible part of the list from the reference position.
 116      *
 117      * @param   position    Reference position previously returned by {@link LocalFileListFragment#getReferencePosition()}
 118      */
 119     protected void setReferencePosition(int position) {
 120         if (mList != null) {
 121             mList.setAndCenterSelection(position);
 122         }
 123     }
 124
 125     @Override
 126     public void onItemClick (AdapterView<?> parent, View view, int position, long id) {
 127         // to be @overriden
 128     }
 129
 130     @Override
 131     public void onRefresh() {
 132         // to be @overriden
 133         mRefreshLayout.setRefreshing(false);
 134     }
 135
 136     /**
 137      * Enables swipe gesture
 138      */
 139     public void enableSwipe() {
 140         mRefreshLayout.setEnabled(true);
 141     }
 142
 143     /**
 144      * Disables swipe gesture. It prevents manual gestures but keeps the option you show
 145      * refreshing programmatically.
 146      */
 147     public void disableSwipe() {
 148         mRefreshLayout.setEnabled(false);
 149     }
 150
 151     /**
 152      * It shows the SwipeRefreshLayout progress
 153      */
 154     public void showSwipeProgress() {
 155         mRefreshLayout.setRefreshing(true);
 156     }
 157
 158     /**
 159      * It shows the SwipeRefreshLayout progress
 160      */
 161     public void hideSwipeProgress() {
 162         mRefreshLayout.setRefreshing(false);
 163     }
 164
 165
 166 }