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.Log_OC;
  23 import com.owncloud.android.R;
  24 import com.owncloud.android.ui.ExtendedListView;
  25
  26 import android.os.Bundle;
  27 import android.view.LayoutInflater;
  28 import android.view.View;
  29 import android.view.ViewGroup;
  30 import android.widget.AdapterView;
  31 import android.widget.ListAdapter;
  32 import android.widget.AdapterView.OnItemClickListener;
  33 import android.widget.ListView;
  34
  35 /**
  36  *  TODO extending SherlockListFragment instead of SherlockFragment
  37  */
  38 public class ExtendedListFragment extends SherlockFragment implements OnItemClickListener {
  39
  40     private static final String TAG = ExtendedListFragment.class.getSimpleName();
  41
  42     private static final String KEY_SAVED_LIST_POSITION = "SAVED_LIST_POSITION";
  43
  44     protected ExtendedListView mList;
  45
  46     public void setListAdapter(ListAdapter listAdapter) {
  47         mList.setAdapter(listAdapter);
  48         mList.invalidate();
  49     }
  50
  51     public ListView getListView() {
  52         return mList;
  53     }
  54
  55
  56     @Override
  57     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
  58         Log_OC.e(TAG, "onCreateView");
  59         //mList = new ExtendedListView(getActivity());
  60         View v = inflater.inflate(R.layout.list_fragment, null);
  61         mList = (ExtendedListView)(v.findViewById(R.id.list_root));
  62         mList.setOnItemClickListener(this);
  63         //mList.setEmptyView(v.findViewById(R.id.empty_list_view));     // looks like it's not a cool idea
  64         mList.setDivider(getResources().getDrawable(R.drawable.uploader_list_separator));
  65         mList.setDividerHeight(1);
  66
  67         if (savedInstanceState != null) {
  68             int referencePosition = savedInstanceState.getInt(KEY_SAVED_LIST_POSITION);
  69             setReferencePosition(referencePosition);
  70         }
  71
  72         return v;
  73     }
  74
  75
  76     @Override
  77     public void onSaveInstanceState(Bundle savedInstanceState) {
  78         super.onSaveInstanceState(savedInstanceState);
  79         Log_OC.e(TAG, "onSaveInstanceState()");
  80         savedInstanceState.putInt(KEY_SAVED_LIST_POSITION, getReferencePosition());
  81     }
  82
  83
  84     /**
  85      * Calculates the position of the item that will be used as a reference to reposition the visible items in the list when
  86      * the device is turned to other position.
  87      *
  88      * THe current policy is take as a reference the visible item in the center of the screen.
  89      *
  90      * @return      The position in the list of the visible item in the center of the screen.
  91      */
  92     protected int getReferencePosition() {
  93         if (mList != null) {
  94             return (mList.getFirstVisiblePosition() + mList.getLastVisiblePosition()) / 2;
  95         } else {
  96             return 0;
  97         }
  98     }
  99
 100
 101     /**
 102      * Sets the visible part of the list from the reference position.
 103      *
 104      * @param   position    Reference position previously returned by {@link LocalFileListFragment#getReferencePosition()}
 105      */
 106     protected void setReferencePosition(int position) {
 107         if (mList != null) {
 108             mList.setAndCenterSelection(position);
 109         }
 110     }
 111
 112     @Override
 113     public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
 114         // to be @overriden
 115     }
 116
 117
 118 }