objectsupport.java

PIY(Program It Yourself)是一个基于Java的应用程序开发环境

package piy.support;

import piy.*;
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
import java.awt.Dimension;
import java.beans.*;

/**
* Support for properties of the Object type. All Object properties need to be bound to another
* Property property in the same holder.  The way an object property is bound to another is by
* having a <code>get<PropertyName>Binding()</code> method.  That is, if the object property
* is called <code>Value</code> then there must be a method called <code>getValueBinding()</code>.
* The method should return a String representing the property name the object property depends
* upon.  This class needs to be told the reference of the class support that has been set up
* for its pair. <p>
* Note:  The object property will be given a FixedProperty object as its value - to get the
* actual value, FixedProperty.getActualValue() should be used.
* @author David Vivash
* @version 1.0.1, 26/03/01
*/
public class ObjectSupport extends ClassSupport implements PropertyChangeListener
{
	ClassSupport support = null;
	
	public ObjectSupport(Property property) {
		super(property);

		setLayout(new BorderLayout());
		
	}

	public void setPairSupport(ClassSupport pair) {
		pair.addPropertyChangeListener(this);
		setup(new Property(null, null, ((Property)pair.getProperty().getValue()).getType()), false);
	}

	public static Class getSupportedClass() { return Object.class; } 
	
	public Dimension getMinimumSize() { return support == null ? new Dimension(10, 40) : support.getMinimumSize(); }
	public Dimension getPreferredSize() { return support == null ? new Dimension(100, 40) : support.getPreferredSize(); }
	public Dimension getMaximumSize() { return support == null ? new Dimension(10000, 40) : support.getMaximumSize(); }

	public void propertyChange(PropertyChangeEvent e) {
		removeAll();
		Property value = (Property)e.getNewValue();

		property.setValue(new FixedProperty(null, value.getType()));
		ProjectHandler.getInstance().projectChanged();

		setup(value, true);	
	}

	private void setup(Property value, boolean validate) {
		if (value != null)
			if (value.getType() != null) {

				Object newVal = property.getValue();
				if (!(newVal instanceof FixedProperty)) {
					newVal = new FixedProperty(null, value.getType());
					property.setValue(newVal);
				}

				support = new FixedPropertySupport(property);

				if (support != null) add(support, BorderLayout.CENTER);

				if (validate) {
					getParent().validate();
					getParent().repaint();
				}
			}
	}
}