コード例 #1
0
 @Override
 public Task prepareDocument() {
   Task task = super.prepareDocument();
   // Avoid listening to the same task more than once.
   if (task != prepareTask2) {
     prepareTask2 = task;
     task.addTaskListener(
         new TaskListener() {
           public void taskFinished(Task task) {
             QuietUndoManager undo = getUndoManager();
             StyledDocument doc = getDocument();
             synchronized (undo) {
               // Now that the document is ready, pass it to the manager.
               undo.setDocument((AbstractDocument) doc);
               if (!undo.isCompound()) {
                 // The superclass prepareDocument() adds the undo/redo
                 // manager as a listener -- we need to remove it since
                 // we will initially listen to the model instead.
                 doc.removeUndoableEditListener(undo);
                 // If not listening to document, then listen to model.
                 addUndoManagerToModel(undo);
               }
             }
             prepareTask2 = null;
           }
         });
   }
   return task;
 }
コード例 #2
0
 @Override
 public Task reloadDocument() {
   Task task = super.reloadDocument();
   task.addTaskListener(
       new TaskListener() {
         public void taskFinished(Task task) {
           EventQueue.invokeLater(
               new Runnable() {
                 public void run() {
                   QuietUndoManager undo = getUndoManager();
                   StyledDocument doc = getDocument();
                   // The superclass reloadDocument() adds the undo
                   // manager as an undoable edit listener.
                   synchronized (undo) {
                     if (!undo.isCompound()) {
                       doc.removeUndoableEditListener(undo);
                     }
                   }
                 }
               });
         }
       });
   return task;
 }