src/com/owncloud/android/ui/preview/PreviewTextFragment.java

   1 package com.owncloud.android.ui.preview;
   2
   3 import android.accounts.Account;
   4 import android.os.AsyncTask;
   5 import android.os.Bundle;
   6 import android.support.v4.app.Fragment;
   7 import android.support.v4.app.FragmentManager;
   8 import android.support.v4.app.FragmentTransaction;
   9 import android.view.LayoutInflater;
  10 import android.view.Menu;
  11 import android.view.MenuInflater;
  12 import android.view.MenuItem;
  13 import android.view.View;
  14 import android.view.ViewGroup;
  15 import android.widget.TextView;
  16
  17 import com.owncloud.android.R;
  18 import com.owncloud.android.datamodel.OCFile;
  19 import com.owncloud.android.files.FileMenuFilter;
  20 import com.owncloud.android.lib.common.utils.Log_OC;
  21 import com.owncloud.android.ui.activity.FileDisplayActivity;
  22 import com.owncloud.android.ui.dialog.ConfirmationDialogFragment;
  23 import com.owncloud.android.ui.dialog.LoadingDialog;
  24 import com.owncloud.android.ui.dialog.RemoveFileDialogFragment;
  25 import com.owncloud.android.ui.fragment.FileFragment;
  26
  27 import java.io.BufferedWriter;
  28 import java.io.FileInputStream;
  29 import java.io.IOException;
  30 import java.io.StringWriter;
  31 import java.lang.ref.WeakReference;
  32 import java.util.Scanner;
  33
  34 public class PreviewTextFragment extends FileFragment {
  35     private static final String EXTRA_FILE = "FILE";
  36     private static final String EXTRA_ACCOUNT = "ACCOUNT";
  37     private static final String TAG = PreviewTextFragment.class.getSimpleName();
  38
  39     private Account mAccount;
  40     private TextView mTextPreview;
  41     private TextLoadAsyncTask mTextLoadTask;
  42
  43     /**
  44      * Creates an empty fragment for previews.
  45      * <p/>
  46      * MUST BE KEPT: the system uses it when tries to reinstantiate a fragment automatically
  47      * (for instance, when the device is turned a aside).
  48      * <p/>
  49      * DO NOT CALL IT: an {@link OCFile} and {@link Account} must be provided for a successful
  50      * construction
  51      */
  52     public PreviewTextFragment() {
  53         super();
  54         mAccount = null;
  55     }
  56
  57     /**
  58      * {@inheritDoc}
  59      */
  60     @Override
  61     public View onCreateView(LayoutInflater inflater, ViewGroup container,
  62                              Bundle savedInstanceState) {
  63         super.onCreateView(inflater, container, savedInstanceState);
  64         Log_OC.e(TAG, "onCreateView");
  65
  66
  67         View ret = inflater.inflate(R.layout.text_file_preview, container, false);
  68
  69         mTextPreview = (TextView) ret.findViewById(R.id.text_preview);
  70
  71         return ret;
  72     }
  73
  74     /**
  75      * {@inheritDoc}
  76      */
  77     @Override
  78     public void onCreate(Bundle savedInstanceState) {
  79         super.onCreate(savedInstanceState);
  80
  81         OCFile file = getFile();
  82
  83         Bundle args = getArguments();
  84
  85         if (file == null) {
  86             file = args.getParcelable(FileDisplayActivity.EXTRA_FILE);
  87         }
  88
  89         if (mAccount == null) {
  90             mAccount = args.getParcelable(FileDisplayActivity.EXTRA_ACCOUNT);
  91         }
  92
  93         if (savedInstanceState == null) {
  94             if (file == null) {
  95                 throw new IllegalStateException("Instanced with a NULL OCFile");
  96             }
  97             if (mAccount == null) {
  98                 throw new IllegalStateException("Instanced with a NULL ownCloud Account");
  99             }
 100         } else {
 101             file = savedInstanceState.getParcelable(EXTRA_FILE);
 102             mAccount = savedInstanceState.getParcelable(EXTRA_ACCOUNT);
 103         }
 104         setFile(file);
 105         setHasOptionsMenu(true);
 106     }
 107
 108     /**
 109      * {@inheritDoc}
 110      */
 111     @Override
 112     public void onSaveInstanceState(Bundle outState) {
 113         super.onSaveInstanceState(outState);
 114         outState.putParcelable(PreviewTextFragment.EXTRA_FILE, getFile());
 115         outState.putParcelable(PreviewTextFragment.EXTRA_ACCOUNT, mAccount);
 116     }
 117
 118     @Override
 119     public void onStart() {
 120         super.onStart();
 121         Log_OC.e(TAG, "onStart");
 122
 123         loadAndShowTextPreview();
 124     }
 125
 126     private void loadAndShowTextPreview() {
 127         mTextLoadTask = new TextLoadAsyncTask(new WeakReference<TextView>(mTextPreview));
 128         mTextLoadTask.execute(getFile().getStoragePath());
 129     }
 130
 131
 132     /**
 133      * Reads the file to preview and shows its contents. Too critical to be anonymous.
 134      */
 135     private class TextLoadAsyncTask extends AsyncTask<Object, Void, StringWriter> {
 136         private final String DIALOG_WAIT_TAG = "DIALOG_WAIT";
 137         private final WeakReference<TextView> mTextViewReference;
 138
 139         private TextLoadAsyncTask(WeakReference<TextView> textView) {
 140             mTextViewReference = textView;
 141         }
 142
 143
 144         @Override
 145         protected void onPreExecute() {
 146             showLoadingDialog();
 147         }
 148
 149         @Override
 150         protected StringWriter doInBackground(java.lang.Object... params) {
 151             if (params.length != 1) {
 152                 throw new IllegalArgumentException("The parameter to " + TextLoadAsyncTask.class.getName() + " must be (1) the file location");
 153             }
 154             final String location = (String) params[0];
 155
 156             FileInputStream inputStream = null;
 157             Scanner sc = null;
 158             StringWriter source = new StringWriter();
 159             BufferedWriter bufferedWriter = new BufferedWriter(source);
 160             try {
 161                 inputStream = new FileInputStream(location);
 162                 sc = new Scanner(inputStream);
 163                 while (sc.hasNextLine()) {
 164                     bufferedWriter.append(sc.nextLine());
 165                     if (sc.hasNextLine()) bufferedWriter.append("\n");
 166                 }
 167                 bufferedWriter.close();
 168                 IOException exc = sc.ioException();
 169                 if (exc != null) throw exc;
 170             } catch (IOException e) {
 171                 Log_OC.e(TAG, e.getMessage(), e);
 172                 finish();
 173             } finally {
 174                 if (inputStream != null) {
 175                     try {
 176                         inputStream.close();
 177                     } catch (IOException e) {
 178                         Log_OC.e(TAG, e.getMessage(), e);
 179                         finish();
 180                     }
 181                 }
 182                 if (sc != null) {
 183                     sc.close();
 184                 }
 185             }
 186             return source;
 187         }
 188
 189         @Override
 190         protected void onPostExecute(final StringWriter stringWriter) {
 191             final TextView textView = mTextViewReference.get();
 192
 193             if (textView != null) {
 194                 textView.setText(new String(stringWriter.getBuffer()));
 195                 textView.setVisibility(View.VISIBLE);
 196             }
 197
 198             dismissLoadingDialog();
 199         }
 200
 201         /**
 202          * Show loading dialog
 203          */
 204         public void showLoadingDialog() {
 205             // only once
 206             Fragment frag = getActivity().getSupportFragmentManager().findFragmentByTag(DIALOG_WAIT_TAG);
 207             LoadingDialog loading = null;
 208             if (frag == null) {
 209                 // Construct dialog
 210                 loading = new LoadingDialog(getResources().getString(R.string.wait_a_moment));
 211                 FragmentManager fm = getActivity().getSupportFragmentManager();
 212                 FragmentTransaction ft = fm.beginTransaction();
 213                 loading.show(ft, DIALOG_WAIT_TAG);
 214             } else {
 215                 loading = (LoadingDialog) frag;
 216                 loading.setShowsDialog(true);
 217             }
 218
 219         }
 220
 221         /**
 222          * Dismiss loading dialog
 223          */
 224         public void dismissLoadingDialog() {
 225             final Fragment frag = getActivity().getSupportFragmentManager().findFragmentByTag(DIALOG_WAIT_TAG);
 226             if (frag != null) {
 227                 LoadingDialog loading = (LoadingDialog) frag;
 228                 loading.dismiss();
 229             }
 230         }
 231     }
 232
 233     /**
 234      * {@inheritDoc}
 235      */
 236     @Override
 237     public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
 238         super.onCreateOptionsMenu(menu, inflater);
 239         inflater.inflate(R.menu.file_actions_menu, menu);
 240     }
 241
 242     /**
 243      * {@inheritDoc}
 244      */
 245     @Override
 246     public void onPrepareOptionsMenu(Menu menu) {
 247         super.onPrepareOptionsMenu(menu);
 248
 249         if (mContainerActivity.getStorageManager() != null) {
 250             FileMenuFilter mf = new FileMenuFilter(
 251                     getFile(),
 252                     mContainerActivity.getStorageManager().getAccount(),
 253                     mContainerActivity,
 254                     getActivity()
 255             );
 256             mf.filter(menu);
 257         }
 258
 259         // additional restriction for this fragment
 260         MenuItem item = menu.findItem(R.id.action_rename_file);
 261         if (item != null) {
 262             item.setVisible(false);
 263             item.setEnabled(false);
 264         }
 265
 266         // additional restriction for this fragment
 267         item = menu.findItem(R.id.action_move);
 268         if (item != null) {
 269             item.setVisible(false);
 270             item.setEnabled(false);
 271         }
 272
 273         // this one doesn't make sense since the file has to be down in order to be previewed
 274         item = menu.findItem(R.id.action_download_file);
 275         if (item != null) {
 276             item.setVisible(false);
 277             item.setEnabled(false);
 278         }
 279
 280         item = menu.findItem(R.id.action_sync_file);
 281         if (item != null) {
 282             item.setVisible(false);
 283             item.setEnabled(false);
 284         }
 285
 286         item = menu.findItem(R.id.action_sync_account);
 287         if (item != null) {
 288             item.setVisible(false);
 289             item.setEnabled(false);
 290         }
 291     }
 292
 293     /**
 294      * {@inheritDoc}
 295      */
 296     @Override
 297     public boolean onOptionsItemSelected(MenuItem item) {
 298         switch (item.getItemId()) {
 299             case R.id.action_share_file: {
 300                 mContainerActivity.getFileOperationsHelper().shareFileWithLink(getFile());
 301                 return true;
 302             }
 303             case R.id.action_unshare_file: {
 304                 mContainerActivity.getFileOperationsHelper().unshareFileWithLink(getFile());
 305                 return true;
 306             }
 307             case R.id.action_open_file_with: {
 308                 openFile();
 309                 return true;
 310             }
 311             case R.id.action_remove_file: {
 312                 RemoveFileDialogFragment dialog = RemoveFileDialogFragment.newInstance(getFile());
 313                 dialog.show(getFragmentManager(), ConfirmationDialogFragment.FTAG_CONFIRMATION);
 314                 return true;
 315             }
 316             case R.id.action_see_details: {
 317                 seeDetails();
 318                 return true;
 319             }
 320             case R.id.action_send_file: {
 321                 sendFile();
 322                 return true;
 323             }
 324             case R.id.action_sync_file: {
 325                 mContainerActivity.getFileOperationsHelper().syncFile(getFile());
 326                 return true;
 327             }
 328
 329             default:
 330                 return false;
 331         }
 332     }
 333
 334     /**
 335      * Update the file of the fragment with file value
 336      *
 337      * @param file The new file to set
 338      */
 339     public void updateFile(OCFile file) {
 340         setFile(file);
 341     }
 342
 343     private void sendFile() {
 344         mContainerActivity.getFileOperationsHelper().sendDownloadedFile(getFile());
 345     }
 346
 347     private void seeDetails() {
 348         mContainerActivity.showDetails(getFile());
 349     }
 350
 351     @Override
 352     public void onPause() {
 353         Log_OC.e(TAG, "onPause");
 354         super.onPause();
 355     }
 356
 357     @Override
 358     public void onResume() {
 359         super.onResume();
 360         Log_OC.e(TAG, "onResume");
 361     }
 362
 363     @Override
 364     public void onDestroy() {
 365         Log_OC.e(TAG, "onDestroy");
 366         super.onDestroy();
 367     }
 368
 369     @Override
 370     public void onStop() {
 371         super.onStop();
 372         Log_OC.e(TAG, "onStop");
 373         if (mTextLoadTask != null)
 374             mTextLoadTask.cancel(Boolean.TRUE);
 375     }
 376
 377     /**
 378      * Opens the previewed file with an external application.
 379      */
 380     private void openFile() {
 381         mContainerActivity.getFileOperationsHelper().openFile(getFile());
 382         finish();
 383     }
 384
 385     /**
 386      * Helper method to test if an {@link OCFile} can be passed to a {@link PreviewTextFragment} to be previewed.
 387      *
 388      * @param file File to test if can be previewed.
 389      * @return 'True' if the file can be handled by the fragment.
 390      */
 391     public static boolean canBePreviewed(OCFile file) {
 392         return (file != null && file.isDown() && file.isText());
 393     }
 394
 395     /**
 396      * Finishes the preview
 397      */
 398     private void finish() {
 399         getActivity().runOnUiThread(new Runnable() {
 400             @Override
 401             public void run() {
 402                 getActivity().onBackPressed();
 403             }
 404         });
 405     }
 406 }