?? drawingmodel.java
字號:
// DrawingModel.java
// DrawingModel is the model for a DeitelDrawing painting. It
// provides methods for adding and removing shapes from a
// drawing.
package com.deitel.advjhtp1.drawing.model;
// Java core packages
import java.util.*;
// Deitel packages
import com.deitel.advjhtp1.drawing.model.shapes.*;
public class DrawingModel extends Observable {
// shapes contained in model
private Collection shapes;
// no-argument constructor
public DrawingModel()
{
shapes = new ArrayList();
}
// add shape to model
public void addShape( MyShape shape )
{
// add new shape to list of shapes
shapes.add( shape );
// send model changed notification
fireModelChanged();
}
// remove shape from model
public void removeShape( MyShape shape )
{
// remove shape from list
shapes.remove( shape );
// send model changed notification
fireModelChanged();
}
// get Collection of shapes in model
public Collection getShapes()
{
return Collections.unmodifiableCollection( shapes );
}
// set Collection of shapes in model
public void setShapes( Collection newShapes )
{
// copy Collection into new ArrayList
shapes = new ArrayList( newShapes );
// send model changed notification
fireModelChanged();
}
// empty the current ArrayList of shapes
public void clear()
{
shapes = new ArrayList();
// send model changed notification
fireModelChanged();
}
// send model changed notification
private void fireModelChanged()
{
// set model changed flag
setChanged();
// notify Observers that model changed
notifyObservers();
}
}
/***************************************************************
* (C) Copyright 2002 by Deitel & Associates, Inc. and *
* Prentice Hall. All Rights Reserved. *
* *
* DISCLAIMER: The authors and publisher of this book have *
* used their best efforts in preparing the book. These *
* efforts include the development, research, and testing of *
* the theories and programs to determine their effectiveness. *
* The authors and publisher make no warranty of any kind, *
* expressed or implied, with regard to these programs or to *
* the documentation contained in these books. The authors *
* and publisher shall not be liable in any event for *
* incidental or consequential damages in connection with, or *
* arising out of, the furnishing, performance, or use of *
* these programs. *
***************************************************************/
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