Examples of org.eclipse.core.commands.operations.IUndoableOperation.canUndo()

Package org.eclipse.core.commands.operations

Class org.eclipse.core.commands.operations.IUndoableOperation

Examples of org.eclipse.core.commands.operations.IUndoableOperation.canUndo()

org.eclipse.core.commands.operations.IUndoableOperation.canUndo()

Returns whether the operation can be undone in its current state.

Note: The computation for this method must be fast, as it is called frequently. If necessary, this method can be optimistic in its computation (returning true) and later perform more time-consuming computations during the actual undo of the operation, returning the appropriate status if the operation cannot actually be undone at that time.
@return true if the operation can be undone;false otherwise.

    for (final Iterator it = _stepOperations.iterator(); it.hasNext();)
    {
      IUndoableOperation op = (IUndoableOperation) it.next();
      
      // fail fast
      if (!op.canUndo())
      {
        return false;
      }
    }

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    for (final Iterator it = _stepOperations.iterator(); it.hasNext();)
    {
      IUndoableOperation op = (IUndoableOperation) it.next();
      
      // fail fast
      if (!op.canUndo())
      {
        return false;
      }
    }

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      // record the current valid state for the top operation in case it remains the
      // top operation but changes state.
      IUndoableOperation op= fHistory.getUndoOperation(fUndoContext);
      boolean wasValid= false;
      if (op != null)
        wasValid= op.canUndo();
      // Process the change, providing the before and after timestamps
      processChange(event.getOffset(), event.getOffset() + event.getLength(), event.getText(), fReplacedText, fPreservedUndoModificationStamp, fPreservedRedoModificationStamp);


      // now update fCurrent with the latest buffers from the document change.
      fCurrent.pretendCommit();

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      // remains the
      // top operation but changes state.
      IUndoableOperation op= fHistory.getUndoOperation(fUndoContext);
      boolean wasValid= false;
      if (op != null)
        wasValid= op.canUndo();
      // Process the change, providing the before and after timestamps
      processChange(event.getOffset(), event.getOffset()
          + event.getLength(), event.getText(), fReplacedText,
          fPreservedUndoModificationStamp,
          fPreservedRedoModificationStamp);

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      // record the current valid state for the top operation in case it remains the
      // top operation but changes state.
      IUndoableOperation op= fHistory.getUndoOperation(fUndoContext);
      boolean wasValid= false;
      if (op != null)
        wasValid= op.canUndo();
      // Process the change, providing the before and after timestamps
      processChange(event.getOffset(), event.getOffset() + event.getLength(), event.getText(), fReplacedText, fPreservedUndoModificationStamp, fPreservedRedoModificationStamp);


      // now update fCurrent with the latest buffers from the document change.
      fCurrent.pretendCommit();

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