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

   1 /**
   2  *   ownCloud Android client application
   3  *
   4  *   Copyright (C) 2012 Bartek Przybylski
   5  *   Copyright (C) 2012-2015 ownCloud Inc.
   6  *
   7  *   This program is free software: you can redistribute it and/or modify
   8  *   it under the terms of the GNU General Public License version 2,
   9  *   as published by the Free Software Foundation.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  *
  19  */
  20
  21 package com.owncloud.android.ui.fragment;
  22
  23 import java.util.ArrayList;
  24
  25 import android.os.Build;
  26 import android.os.Bundle;
  27 import android.support.v4.app.Fragment;
  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.AbsListView;
  33 import android.widget.AdapterView;
  34 import android.widget.AdapterView.OnItemClickListener;
  35 import android.widget.GridView;
  36 import android.widget.ListAdapter;
  37 import android.widget.ListView;
  38 import android.widget.TextView;
  39
  40 import com.owncloud.android.R;
  41 import com.owncloud.android.lib.common.utils.Log_OC;
  42 import com.owncloud.android.ui.ExtendedListView;
  43 import com.owncloud.android.ui.activity.OnEnforceableRefreshListener;
  44 import com.owncloud.android.ui.adapter.FileListListAdapter;
  45
  46 import third_parties.in.srain.cube.GridViewWithHeaderAndFooter;
  47
  48 /**
  49  * TODO extending SherlockListFragment instead of SherlockFragment
  50  */
  51 public class ExtendedListFragment extends Fragment
  52         implements OnItemClickListener, OnEnforceableRefreshListener {
  53
  54     private static final String TAG = ExtendedListFragment.class.getSimpleName();
  55
  56     private static final String KEY_SAVED_LIST_POSITION = "SAVED_LIST_POSITION";
  57     private static final String KEY_INDEXES = "INDEXES";
  58     private static final String KEY_FIRST_POSITIONS= "FIRST_POSITIONS";
  59     private static final String KEY_TOPS = "TOPS";
  60     private static final String KEY_HEIGHT_CELL = "HEIGHT_CELL";
  61     private static final String KEY_EMPTY_LIST_MESSAGE = "EMPTY_LIST_MESSAGE";
  62
  63     private SwipeRefreshLayout mRefreshListLayout;
  64     private SwipeRefreshLayout mRefreshGridLayout;
  65     private SwipeRefreshLayout mRefreshEmptyLayout;
  66     private TextView mEmptyListMessage;
  67
  68     // Save the state of the scroll in browsing
  69     private ArrayList<Integer> mIndexes;
  70     private ArrayList<Integer> mFirstPositions;
  71     private ArrayList<Integer> mTops;
  72     private int mHeightCell = 0;
  73
  74     private SwipeRefreshLayout.OnRefreshListener mOnRefreshListener = null;
  75
  76     protected AbsListView mCurrentListView;
  77     private ExtendedListView mListView;
  78     private View mListFooterView;
  79     private GridViewWithHeaderAndFooter mGridView;
  80     private View mGridFooterView;
  81
  82     private ListAdapter mAdapter;
  83
  84     protected void setListAdapter(ListAdapter listAdapter) {
  85         mAdapter = listAdapter;
  86         if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
  87             mCurrentListView.setAdapter(listAdapter);
  88         } else {
  89             ((ListView)mCurrentListView).setAdapter(listAdapter);
  90         }
  91
  92         mCurrentListView.invalidate();
  93     }
  94
  95     protected AbsListView getListView() {
  96         return mCurrentListView;
  97     }
  98
  99
 100     protected void switchToGridView() {
 101         if ((mCurrentListView == mListView)) {
 102
 103             mListView.setAdapter(null);
 104             mRefreshListLayout.setVisibility(View.GONE);
 105
 106             if (mAdapter instanceof FileListListAdapter) {
 107                 ((FileListListAdapter) mAdapter).setGridMode(true);
 108             }
 109             mGridView.setAdapter(mAdapter);
 110             mRefreshGridLayout.setVisibility(View.VISIBLE);
 111
 112             mCurrentListView = mGridView;
 113         }
 114     }
 115
 116     protected void switchToListView() {
 117         if (mCurrentListView == mGridView) {
 118             mGridView.setAdapter(null);
 119             mRefreshGridLayout.setVisibility(View.GONE);
 120
 121             if (mAdapter instanceof FileListListAdapter) {
 122                 ((FileListListAdapter) mAdapter).setGridMode(false);
 123             }
 124             mListView.setAdapter(mAdapter);
 125             mRefreshListLayout.setVisibility(View.VISIBLE);
 126
 127             mCurrentListView = mListView;
 128         }
 129     }
 130
 131
 132     @Override
 133     public View onCreateView(LayoutInflater inflater, ViewGroup container,
 134                              Bundle savedInstanceState) {
 135         Log_OC.d(TAG, "onCreateView");
 136
 137         View v = inflater.inflate(R.layout.list_fragment, null);
 138
 139         mListView = (ExtendedListView)(v.findViewById(R.id.list_root));
 140         mListView.setOnItemClickListener(this);
 141         mListFooterView = inflater.inflate(R.layout.list_footer, null, false);
 142
 143         mGridView = (GridViewWithHeaderAndFooter) (v.findViewById(R.id.grid_root));
 144         mGridView.setNumColumns(GridView.AUTO_FIT);
 145         mGridView.setOnItemClickListener(this);
 146         mGridFooterView = inflater.inflate(R.layout.list_footer, null, false);
 147
 148         if (savedInstanceState != null) {
 149             int referencePosition = savedInstanceState.getInt(KEY_SAVED_LIST_POSITION);
 150             if (mCurrentListView == mListView) {
 151                 Log_OC.v(TAG, "Setting and centering around list position " + referencePosition);
 152                 mListView.setAndCenterSelection(referencePosition);
 153             } else {
 154                 Log_OC.v(TAG, "Setting grid position " + referencePosition);
 155                 mGridView.setSelection(referencePosition);
 156             }
 157         }
 158
 159         // Pull-down to refresh layout
 160         mRefreshListLayout = (SwipeRefreshLayout) v.findViewById(R.id.swipe_containing_list);
 161         mRefreshGridLayout = (SwipeRefreshLayout) v.findViewById(R.id.swipe_containing_grid);
 162         mRefreshEmptyLayout = (SwipeRefreshLayout) v.findViewById(R.id.swipe_containing_empty);
 163         mEmptyListMessage = (TextView) v.findViewById(R.id.empty_list_view);
 164
 165         onCreateSwipeToRefresh(mRefreshListLayout);
 166         onCreateSwipeToRefresh(mRefreshGridLayout);
 167         onCreateSwipeToRefresh(mRefreshEmptyLayout);
 168
 169         mListView.setEmptyView(mRefreshEmptyLayout);
 170         mGridView.setEmptyView(mRefreshEmptyLayout);
 171
 172         mCurrentListView = mListView;   // list as default
 173
 174         return v;
 175     }
 176
 177     /**
 178      * {@inheritDoc}
 179      */
 180     @Override
 181     public void onActivityCreated(Bundle savedInstanceState) {
 182         super.onActivityCreated(savedInstanceState);
 183
 184         if (savedInstanceState != null) {
 185             mIndexes = savedInstanceState.getIntegerArrayList(KEY_INDEXES);
 186             mFirstPositions = savedInstanceState.getIntegerArrayList(KEY_FIRST_POSITIONS);
 187             mTops = savedInstanceState.getIntegerArrayList(KEY_TOPS);
 188             mHeightCell = savedInstanceState.getInt(KEY_HEIGHT_CELL);
 189             setMessageForEmptyList(savedInstanceState.getString(KEY_EMPTY_LIST_MESSAGE));
 190
 191         } else {
 192             mIndexes = new ArrayList<Integer>();
 193             mFirstPositions = new ArrayList<Integer>();
 194             mTops = new ArrayList<Integer>();
 195             mHeightCell = 0;
 196         }
 197     }
 198
 199
 200     @Override
 201     public void onSaveInstanceState(Bundle savedInstanceState) {
 202         super.onSaveInstanceState(savedInstanceState);
 203         Log_OC.d(TAG, "onSaveInstanceState()");
 204         savedInstanceState.putInt(KEY_SAVED_LIST_POSITION, getReferencePosition());
 205         savedInstanceState.putIntegerArrayList(KEY_INDEXES, mIndexes);
 206         savedInstanceState.putIntegerArrayList(KEY_FIRST_POSITIONS, mFirstPositions);
 207         savedInstanceState.putIntegerArrayList(KEY_TOPS, mTops);
 208         savedInstanceState.putInt(KEY_HEIGHT_CELL, mHeightCell);
 209         savedInstanceState.putString(KEY_EMPTY_LIST_MESSAGE, getEmptyViewText());
 210     }
 211
 212     /**
 213      * Calculates the position of the item that will be used as a reference to
 214      * reposition the visible items in the list when the device is turned to
 215      * other position.
 216      *
 217      * The current policy is take as a reference the visible item in the center
 218      * of the screen.
 219      *
 220      * @return The position in the list of the visible item in the center of the
 221      *         screen.
 222      */
 223     protected int getReferencePosition() {
 224         if (mCurrentListView != null) {
 225             return (mCurrentListView.getFirstVisiblePosition() +
 226                     mCurrentListView.getLastVisiblePosition()) / 2;
 227         } else {
 228             return 0;
 229         }
 230     }
 231
 232
 233     /*
 234      * Restore index and position
 235      */
 236     protected void restoreIndexAndTopPosition() {
 237         if (mIndexes.size() > 0) {
 238             // needs to be checked; not every browse-up had a browse-down before
 239
 240             int index = mIndexes.remove(mIndexes.size() - 1);
 241             final int firstPosition = mFirstPositions.remove(mFirstPositions.size() -1);
 242             int top = mTops.remove(mTops.size() - 1);
 243
 244             Log_OC.v(TAG, "Setting selection to position: " + firstPosition + "; top: "
 245                     + top + "; index: " + index);
 246
 247             if (mCurrentListView == mListView) {
 248                 if (mHeightCell*index <= mListView.getHeight()) {
 249                     mListView.setSelectionFromTop(firstPosition, top);
 250                 } else {
 251                     mListView.setSelectionFromTop(index, 0);
 252                 }
 253
 254             } else {
 255                 if (mHeightCell*index <= mGridView.getHeight()) {
 256                     mGridView.setSelection(firstPosition);
 257                     //mGridView.smoothScrollToPosition(firstPosition);
 258                 } else {
 259                     mGridView.setSelection(index);
 260                     //mGridView.smoothScrollToPosition(index);
 261                 }
 262             }
 263
 264         }
 265     }
 266
 267     /*
 268      * Save index and top position
 269      */
 270     protected void saveIndexAndTopPosition(int index) {
 271
 272         mIndexes.add(index);
 273
 274         int firstPosition = mCurrentListView.getFirstVisiblePosition();
 275         mFirstPositions.add(firstPosition);
 276
 277         View view = mCurrentListView.getChildAt(0);
 278         int top = (view == null) ? 0 : view.getTop() ;
 279
 280         mTops.add(top);
 281
 282         // Save the height of a cell
 283         mHeightCell = (view == null || mHeightCell != 0) ? mHeightCell : view.getHeight();
 284     }
 285
 286
 287     @Override
 288     public void onItemClick (AdapterView<?> parent, View view, int position, long id) {
 289         // to be @overriden
 290     }
 291
 292     @Override
 293     public void onRefresh() {
 294         mRefreshListLayout.setRefreshing(false);
 295         mRefreshGridLayout.setRefreshing(false);
 296         mRefreshEmptyLayout.setRefreshing(false);
 297
 298         if (mOnRefreshListener != null) {
 299             mOnRefreshListener.onRefresh();
 300         }
 301     }
 302     public void setOnRefreshListener(OnEnforceableRefreshListener listener) {
 303         mOnRefreshListener = listener;
 304     }
 305
 306
 307     /**
 308      * Disables swipe gesture.
 309      *
 310      * Sets the 'enabled' state of the refresh layouts contained in the fragment.
 311      *
 312      * When 'false' is set, prevents user gestures but keeps the option to refresh programatically,
 313      *
 314      * @param   enabled     Desired state for capturing swipe gesture.
 315      */
 316     public void setSwipeEnabled(boolean enabled) {
 317         mRefreshListLayout.setEnabled(enabled);
 318         mRefreshGridLayout.setEnabled(enabled);
 319         mRefreshEmptyLayout.setEnabled(enabled);
 320     }
 321
 322     /**
 323      * Set message for empty list view
 324      */
 325     public void setMessageForEmptyList(String message) {
 326         if (mEmptyListMessage != null) {
 327             mEmptyListMessage.setText(message);
 328         }
 329     }
 330
 331     /**
 332      * Get the text of EmptyListMessage TextView
 333      *
 334      * @return String
 335      */
 336     public String getEmptyViewText() {
 337         return (mEmptyListMessage != null) ? mEmptyListMessage.getText().toString() : "";
 338     }
 339
 340     private void onCreateSwipeToRefresh(SwipeRefreshLayout refreshLayout) {
 341         // Colors in animations
 342         refreshLayout.setColorSchemeResources(R.color.color_accent, R.color.primary,
 343                 R.color.primary_dark);
 344
 345         refreshLayout.setOnRefreshListener(this);
 346     }
 347
 348     @Override
 349     public void onRefresh(boolean ignoreETag) {
 350         mRefreshListLayout.setRefreshing(false);
 351         mRefreshGridLayout.setRefreshing(false);
 352         mRefreshEmptyLayout.setRefreshing(false);
 353
 354         if (mOnRefreshListener != null) {
 355             mOnRefreshListener.onRefresh();
 356         }
 357     }
 358
 359     protected void setChoiceMode(int choiceMode) {
 360         if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
 361             mListView.setChoiceMode(choiceMode);
 362             mGridView.setChoiceMode(choiceMode);
 363         } else {
 364             ((ListView)mListView).setChoiceMode(choiceMode);
 365         }
 366     }
 367
 368     protected void registerForContextMenu() {
 369         registerForContextMenu(mListView);
 370         registerForContextMenu(mGridView);
 371         mListView.setOnCreateContextMenuListener(this);
 372         mGridView.setOnCreateContextMenuListener(this);
 373     }
 374
 375     /**
 376      * TODO doc
 377      * To be called before setAdapter, or GridViewWithHeaderAndFooter will throw an exception
 378      *
 379      * @param enabled
 380      */
 381     protected void setFooterEnabled(boolean enabled) {
 382         if (enabled) {
 383             if (mGridView.getFooterViewCount() == 0) {
 384                 if (mGridFooterView.getParent() != null ) {
 385                     ((ViewGroup) mGridFooterView.getParent()).removeView(mGridFooterView);
 386                 }
 387                 mGridView.addFooterView(mGridFooterView, null, false);
 388             }
 389             mGridFooterView.invalidate();
 390
 391             if (mListView.getFooterViewsCount() == 0) {
 392                 if (mListFooterView.getParent() != null ) {
 393                     ((ViewGroup) mListFooterView.getParent()).removeView(mListFooterView);
 394                 }
 395                 mListView.addFooterView(mListFooterView, null, false);
 396             }
 397             mListFooterView.invalidate();
 398
 399         } else {
 400             mGridView.removeFooterView(mGridFooterView);
 401             mListView.removeFooterView(mListFooterView);
 402         }
 403     }
 404
 405     /**
 406      * TODO doc
 407      * @param text
 408      */
 409     protected void setFooterText(String text) {
 410         if (text != null && text.length() > 0) {
 411             ((TextView)mListFooterView.findViewById(R.id.footerText)).setText(text);
 412             ((TextView)mGridFooterView.findViewById(R.id.footerText)).setText(text);
 413             setFooterEnabled(true);
 414
 415         } else {
 416             setFooterEnabled(false);
 417         }
 418     }
 419
 420 }