标题: java beans constrained [打印本页]

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作者: qingqing3721    时间: 2011-10-29 18:34     标题: java beans constrained

import java.io.Serializable;import java.beans.PropertyChangeListener;import java.beans.PropertyChangeSupport;import java.beans.PropertyVetoException;import java.beans.VetoableChangeListener;import java.beans.VetoableChangeSupport;import java.awt.Graphics;import javax.swing.JComponent;
/*** Bean with constrained properties.*/public class MyBean extends JComponent implements Serializable{ private String title; private String[] lines = new String[10];
private final PropertyChangeSupport pcs = new PropertyChangeSupport( this ); private final VetoableChangeSupport vcs = new VetoableChangeSupport( this );
public String getTitle() { return this.title; }/*** This method was modified to throw the PropertyVetoException* if some vetoable listeners reject the new title value*/ public void setTitle( String title ) throws PropertyVetoException { String old = this.title; this.vcs.fireVetoableChange( "title", old, title ); this.title = title; this.pcs.firePropertyChange( "title", old, title ); }
public String[] getLines() { return this.lines.clone(); }
public String getLines( int index ) { return this.lines[index]; }/*** This method throws the PropertyVetoException* if some vetoable listeners reject the new lines value*/ public void setLines( String[] lines ) throws PropertyVetoException { String[] old = this.lines; this.vcs.fireVetoableChange( "lines",千选拖把 old, lines ); this.lines = lines; this.pcs.firePropertyChange( "lines", old, lines ); }
public void setLines( int index, String line ) throws PropertyVetoException { String old = this.lines[index]; this.vcs.fireVetoableChange( "lines", old, line ); this.lines[index] = line; this.pcs.fireIndexedPropertyChange( "lines", index, old, line ); }
public void addPropertyChangeListener( PropertyChangeListener listener ) { this.pcs.addPropertyChangeListener( listener ); }
public void removePropertyChangeListener( PropertyChangeListener listener ) { this.pcs.removePropertyChangeListener( listener ); }/*** Registration of the VetoableChangeListener*/ public void addVetoableChangeListener( VetoableChangeListener listener ) { this.vcs.addVetoableChangeListener( listener ); }
public void removeVetoableChangeListener( VetoableChangeListener listener ) { this.vcs.removeVetoableChangeListener( listener ); }
protected void paintComponent( Graphics g ) { g.setColor( getForeground() );
int height = g.getFontMetrics().getHeight(); paintString( g, this.title, height );
if ( this.lines != null ) { int step = height; for ( String line : this.lines ) paintString( g, line, height += step ); } }
private void paintString( Graphics g, String str, int height ) { if ( str != null ) g.drawString( str, 0, height ); }}
TAG:
Java
JAVA
java
beans

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