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             // Construct dialog
 206             LoadingDialog loading = new LoadingDialog(getResources().getString(R.string.wait_a_moment));
 207             FragmentManager fm = getActivity().getSupportFragmentManager();
 208             FragmentTransaction ft = fm.beginTransaction();
 209             loading.show(ft, DIALOG_WAIT_TAG);
 210         }
 211
 212         /**
 213          * Dismiss loading dialog
 214          */
 215         public void dismissLoadingDialog() {
 216             final Fragment frag = getActivity().getSupportFragmentManager().findFragmentByTag(DIALOG_WAIT_TAG);
 217             if (frag != null) {
 218                 LoadingDialog loading = (LoadingDialog) frag;
 219                 loading.dismiss();
 220             }
 221         }
 222     }
 223
 224     /**
 225      * {@inheritDoc}
 226      */
 227     @Override
 228     public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
 229         super.onCreateOptionsMenu(menu, inflater);
 230         inflater.inflate(R.menu.file_actions_menu, menu);
 231     }
 232
 233     /**
 234      * {@inheritDoc}
 235      */
 236     @Override
 237     public void onPrepareOptionsMenu(Menu menu) {
 238         super.onPrepareOptionsMenu(menu);
 239
 240         if (mContainerActivity.getStorageManager() != null) {
 241             FileMenuFilter mf = new FileMenuFilter(
 242                     getFile(),
 243                     mContainerActivity.getStorageManager().getAccount(),
 244                     mContainerActivity,
 245                     getActivity()
 246             );
 247             mf.filter(menu);
 248         }
 249
 250         // additional restriction for this fragment
 251         MenuItem item = menu.findItem(R.id.action_rename_file);
 252         if (item != null) {
 253             item.setVisible(false);
 254             item.setEnabled(false);
 255         }
 256
 257         // additional restriction for this fragment
 258         item = menu.findItem(R.id.action_move);
 259         if (item != null) {
 260             item.setVisible(false);
 261             item.setEnabled(false);
 262         }
 263
 264         // this one doesn't make sense since the file has to be down in order to be previewed
 265         item = menu.findItem(R.id.action_download_file);
 266         if (item != null) {
 267             item.setVisible(false);
 268             item.setEnabled(false);
 269         }
 270
 271         item = menu.findItem(R.id.action_sync_file);
 272         if (item != null) {
 273             item.setVisible(false);
 274             item.setEnabled(false);
 275         }
 276
 277         item = menu.findItem(R.id.action_sync_account);
 278         if (item != null) {
 279             item.setVisible(false);
 280             item.setEnabled(false);
 281         }
 282     }
 283
 284     /**
 285      * {@inheritDoc}
 286      */
 287     @Override
 288     public boolean onOptionsItemSelected(MenuItem item) {
 289         switch (item.getItemId()) {
 290             case R.id.action_share_file: {
 291                 mContainerActivity.getFileOperationsHelper().shareFileWithLink(getFile());
 292                 return true;
 293             }
 294             case R.id.action_unshare_file: {
 295                 mContainerActivity.getFileOperationsHelper().unshareFileWithLink(getFile());
 296                 return true;
 297             }
 298             case R.id.action_open_file_with: {
 299                 openFile();
 300                 return true;
 301             }
 302             case R.id.action_remove_file: {
 303                 RemoveFileDialogFragment dialog = RemoveFileDialogFragment.newInstance(getFile());
 304                 dialog.show(getFragmentManager(), ConfirmationDialogFragment.FTAG_CONFIRMATION);
 305                 return true;
 306             }
 307             case R.id.action_see_details: {
 308                 seeDetails();
 309                 return true;
 310             }
 311             case R.id.action_send_file: {
 312                 sendFile();
 313                 return true;
 314             }
 315             case R.id.action_sync_file: {
 316                 mContainerActivity.getFileOperationsHelper().syncFile(getFile());
 317                 return true;
 318             }
 319
 320             default:
 321                 return false;
 322         }
 323     }
 324
 325     /**
 326      * Update the file of the fragment with file value
 327      *
 328      * @param file The new file to set
 329      */
 330     public void updateFile(OCFile file) {
 331         setFile(file);
 332     }
 333
 334     private void sendFile() {
 335         mContainerActivity.getFileOperationsHelper().sendDownloadedFile(getFile());
 336     }
 337
 338     private void seeDetails() {
 339         mContainerActivity.showDetails(getFile());
 340     }
 341
 342     @Override
 343     public void onPause() {
 344         Log_OC.e(TAG, "onPause");
 345         super.onPause();
 346     }
 347
 348     @Override
 349     public void onResume() {
 350         super.onResume();
 351         Log_OC.e(TAG, "onResume");
 352     }
 353
 354     @Override
 355     public void onDestroy() {
 356         Log_OC.e(TAG, "onDestroy");
 357         super.onDestroy();
 358     }
 359
 360     @Override
 361     public void onStop() {
 362         super.onStop();
 363         Log_OC.e(TAG, "onStop");
 364         if (mTextLoadTask != null)
 365             mTextLoadTask.cancel(Boolean.TRUE);
 366     }
 367
 368     /**
 369      * Opens the previewed file with an external application.
 370      */
 371     private void openFile() {
 372         mContainerActivity.getFileOperationsHelper().openFile(getFile());
 373         finish();
 374     }
 375
 376     /**
 377      * Helper method to test if an {@link OCFile} can be passed to a {@link PreviewTextFragment} to be previewed.
 378      *
 379      * @param file File to test if can be previewed.
 380      * @return 'True' if the file can be handled by the fragment.
 381      */
 382     public static boolean canBePreviewed(OCFile file) {
 383         return (file != null && file.isDown() && file.isText());
 384     }
 385
 386     /**
 387      * Finishes the preview
 388      */
 389     private void finish() {
 390         getActivity().runOnUiThread(new Runnable() {
 391             @Override
 392             public void run() {
 393                 getActivity().onBackPressed();
 394             }
 395         });
 396     }
 397 }