textdisplayer.java

来自「java 完全探索的随书源码」· Java 代码 · 共 87 行

import java.awt.*;
import java.beans.*;
public class TextDisplayer extends Canvas implements PropertyChangeListener {
   // default constructor for this Bean.  This is the constructor that an
   // application builder (such as Visual Basic) would use.
   public TextDisplayer() {
      this( "TextDisplayer", Color.white,
            new Font( "Courier", Font.PLAIN, 12 ), Color.black );
   }

   // custom constructor for this Bean.  This is the constructor you would
   // likely use if you were going to do all your coding from scratch.
   public TextDisplayer( String OutputText, Color BGColor, Font TextFont,
                         Color FontColor ) {
      this.OutputText = OutputText;
      this.BGColor = BGColor;
      this.TextFont = TextFont;
      this.FontColor = FontColor;

      setFont( TextFont );        // set the Canvas's font.
      setBackground( BGColor );   // set the Canvas's background color.
      setForeground( FontColor ); // set the Canvas's foreground color.
   }

   // this Bean's properties.
   protected String OutputText;
   protected Color BGColor, FontColor;
   protected Font TextFont;

   // override the Canvas's paint method to display the text
   public void paint( Graphics g ) {
     // simplistic implementation to display a string
     g.drawString( OutputText, 10, 20 );
   }

   // implement the PropertyChangeListener interface
   public void propertyChange( PropertyChangeEvent evt ) {
     // only interested in the inputText property of TextReader
     if ( evt.getPropertyName().equals("inputText") ) {
       // display the new value of the TextReader property
       setOutputText( (String)evt.getNewValue() );
     }
   }

   public synchronized String getOutputText() {
      return( OutputText );
   }

   public synchronized void setOutputText( String text ) {
      OutputText = text;
      // force a paint
      Graphics g = getGraphics();
      if ( g != null ) {
        update(g);
      }
   }

   public synchronized Color getBGColor() {
      return BGColor;
   }

   public synchronized void setBGColor( Color color ) {
      BGColor = color;
      setBackground( BGColor );   // set the Canvas's background color.
      repaint();
   }

   public synchronized Font getTextFont() {
      return TextFont;
   }

   public synchronized void setTextFont( Font font ) {
      TextFont = font;
      setFont( TextFont );        // set the Canvas's font.
   }

   public synchronized Color getFontColor() {
      return FontColor;
   }

   public synchronized void setFontColor( Color color ) {
      FontColor = color;
      setForeground( FontColor ); // set the Canvas's foreground color.
      repaint();
   }
}