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.view.LayoutInflater;
  29 import android.view.View;
  30 import android.view.ViewGroup;
  31 import android.widget.AdapterView;
  32 import android.widget.ListAdapter;
  33 import android.widget.AdapterView.OnItemClickListener;
  34 import android.widget.ListView;
  35
  36 /**
  37  *  TODO extending SherlockListFragment instead of SherlockFragment
  38  */
  39 public class ExtendedListFragment extends SherlockFragment implements OnItemClickListener {
  40
  41     private static final String TAG = ExtendedListFragment.class.getSimpleName();
  42
  43     private static final String KEY_SAVED_LIST_POSITION = "SAVED_LIST_POSITION";
  44
  45     protected ExtendedListView mList;
  46
  47     public void setListAdapter(ListAdapter listAdapter) {
  48         mList.setAdapter(listAdapter);
  49         mList.invalidate();
  50     }
  51
  52     public ListView getListView() {
  53         return mList;
  54     }
  55
  56
  57     @Override
  58     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
  59         Log_OC.e(TAG, "onCreateView");
  60         //mList = new ExtendedListView(getActivity());
  61         View v = inflater.inflate(R.layout.list_fragment, null);
  62         mList = (ExtendedListView)(v.findViewById(R.id.list_root));
  63         mList.setOnItemClickListener(this);
  64         //mList.setEmptyView(v.findViewById(R.id.empty_list_view));     // looks like it's not a cool idea
  65         mList.setDivider(getResources().getDrawable(R.drawable.uploader_list_separator));
  66         mList.setDividerHeight(1);
  67
  68         if (savedInstanceState != null) {
  69             int referencePosition = savedInstanceState.getInt(KEY_SAVED_LIST_POSITION);
  70             setReferencePosition(referencePosition);
  71         }
  72
  73         return v;
  74     }
  75
  76
  77     @Override
  78     public void onSaveInstanceState(Bundle savedInstanceState) {
  79         super.onSaveInstanceState(savedInstanceState);
  80         Log_OC.e(TAG, "onSaveInstanceState()");
  81         savedInstanceState.putInt(KEY_SAVED_LIST_POSITION, getReferencePosition());
  82     }
  83
  84
  85     /**
  86      * Calculates the position of the item that will be used as a reference to reposition the visible items in the list when
  87      * the device is turned to other position.
  88      *
  89      * THe current policy is take as a reference the visible item in the center of the screen.
  90      *
  91      * @return      The position in the list of the visible item in the center of the screen.
  92      */
  93     protected int getReferencePosition() {
  94         if (mList != null) {
  95             return (mList.getFirstVisiblePosition() + mList.getLastVisiblePosition()) / 2;
  96         } else {
  97             return 0;
  98         }
  99     }
 100
 101
 102     /**
 103      * Sets the visible part of the list from the reference position.
 104      *
 105      * @param   position    Reference position previously returned by {@link LocalFileListFragment#getReferencePosition()}
 106      */
 107     protected void setReferencePosition(int position) {
 108         if (mList != null) {
 109             mList.setAndCenterSelection(position);
 110         }
 111     }
 112
 113     @Override
 114     public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
 115         // to be @overriden
 116     }
 117
 118
 119 }