字体选择器

字体选择器其实也是挺常用的,可是JAVA就是没有提供,可能是SUN觉得字体选择器无关紧要吧,所以SUN只提供了文件选择器和颜色选择器这两个比较难实现的,那么容易实现的也就留给我们自己实现了.我实现的这个文件选择器是以前实现的.类的全称叫lbf.swing.JFontChooser,可以调用的方法是JFontChooser.showDialog(Frame owner,String title)此方法第一个参数传入父组件(可以为null),第二个参数传入对话框的标题,该方法返回Font对象,如果用户直接关闭或者点击取消,则返回null,点击确定,则返回选中的字体对象.

/*
 * JFontChooser.java
 *
 * Created on 2006年11月17日, 上午11:21
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
  */

package  lbf.swing;

/**
 *
 *  @author  lbf
  */
import  javax.swing. * ;
import  java.awt.event. * ;
import  java.awt. * ;
import  java.util. * ;
import  javax.swing.event. * ;
public   class  JFontChooser  extends  JPanel  implements  ActionListener,ListSelectionListener{
     private  JDialog jd; // 用于显示模态的窗体
     private  JComboBox fonts; // 用于选择字体的下拉框
     private  JList face,size; // 用于选择字形和字号的列表
     private  JTextField sizeJT; // 用于显示选中的字形和字号
     private  JButton ok,cancel; // 表示选中和取消的按钮
     private  Font current; // 表示当然选中的字体
     private  GraphicsEnvironment ge; // 表示当前的图形环境
     private  JLabel demo; // 表示预览的label
     private  String fontName = " 宋体 " ;
     private   int  fontStyle = Font.PLAIN,fontSize = 20 ;
     private  Frame owner; // 表示父类的组件窗体
     private  Hashtable < String,Integer >  ht; // 名字到大小的映射
     /**  Creates a new instance of JFontChooser  */
     private  JFontChooser() {
        initOther();
    }
     private   void  initOther(){
        current = new  Font(fontName,fontStyle,fontSize);
        ht = new  Hashtable < String,Integer > ();
        sizeJT = new  JTextField( " 20 " );
        sizeJT.setEditable( false );
        sizeJT.setBounds( 260 , 40 , 50 , 20 );
        ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        String[] family = ge.getAvailableFontFamilyNames();
        fonts = new  JComboBox(family);
        fonts.setEditable( false );
        fonts.setMaximumRowCount( 5 );
        demo = new  JLabel( " 千里冰封  ABCD abcd " ,JLabel.CENTER);
        demo.setFont(current);
        String[] faceString = { " 正常 " , " 粗体 " , " 斜体 " , " 粗体+斜体 " };
        String[] sizeString = { " 初号 " , " 小初 " , " 一号 " , " 小一 " , " 二号 " , " 小二 " ,
         " 三号 " , " 小三 " , " 四号 " , " 小四 " , " 五号 " , " 小五 " , " 六号 " , " 小六 " , " 七号 " ,
         " 八号 " , " 5 " , " 8 " , " 9 " , " 10 " , " 11 " , " 12 " , " 14 " , " 16 " , " 18 " , " 20 " , " 22 " , " 24 " ,
         " 26 " , " 28 " , " 36 " , " 48 " , " 72 " };
         int [] sizeValue = { 42 , 36 , 26 , 24 , 22 , 18 , 16 , 15 , 14 , 12 , 11 , 9 , 7 , 6 , 5 , 4 , 5 , 8 , 9 , 10 , 11 , 12 , 14 , 16 , 18 , 20 ,
         22 , 24 , 26 , 28 , 36 , 48 , 72 };
         for ( int  i = 0 ;i < sizeString.length;i ++ ){
            ht.put(sizeString[i],sizeValue[i]);
        }
        face = new  JList(faceString);
        size = new  JList(sizeString);
        face.setSelectedIndex( 0 );
        size.setSelectedIndex( 25 );
        fonts.setSelectedItem( " 宋体 " );
        face.setVisibleRowCount( 4 );
        size.setVisibleRowCount( 4 );
        ok = new  JButton( " 确定 " );
        cancel = new  JButton( " 取消 " );
        ok.addActionListener( this );
        cancel.addActionListener( this );
        fonts.addActionListener( this );
        face.addListSelectionListener( this );
        size.addListSelectionListener( this );
    }
     private   void  initWindow(String title){
         this .setLayout( new  BorderLayout());
        JLabel fontLabel = new  JLabel( " 字体 " );
        JLabel faceLabel = new  JLabel( " 字形 " );
        JLabel sizeLabel = new  JLabel( " 字号 " );
        fontLabel.setForeground(Color.RED);
        faceLabel.setForeground(Color.RED);
        sizeLabel.setForeground(Color.RED);
        fontLabel.setBounds( 20 , 20 , 100 , 20 );
        faceLabel.setBounds( 180 , 20 , 80 , 20 );
        sizeLabel.setBounds( 260 , 20 , 50 , 20 );
        fonts.setBounds( 10 , 40 , 127 , 21 );
        JScrollPane faceScroll = new  JScrollPane(face);
        JScrollPane sizeScroll = new  JScrollPane(size);
        faceScroll.setBounds( 180 , 40 , 65 , 100 );
        sizeScroll.setBounds( 260 , 60 , 50 , 80 );
        JPanel up = new  JPanel( null );
        JPanel center = new  JPanel( new  BorderLayout());
        JPanel bottom = new  JPanel();
        up.setPreferredSize( new  Dimension( 345 , 160 ));
        up.add(fontLabel);
        up.add(faceLabel);
        up.add(sizeLabel);
        up.add(fonts);
        up.add(faceScroll);
        up.add(sizeScroll);
        up.add(sizeJT);
        up.setBorder(BorderFactory.createTitledBorder( " 选择区 " ));
        center.add(demo,BorderLayout.CENTER);
        center.setBorder(BorderFactory.createTitledBorder( " 预览区 " ));
        bottom.add(ok);
        bottom.add(cancel);
         this .add(up,BorderLayout.NORTH);
         this .add(center,BorderLayout.CENTER);
         this .add(bottom,BorderLayout.SOUTH);
        jd = new  JDialog(owner,title, true );
        jd.getContentPane().add( this ,BorderLayout.CENTER);
        jd.setSize( 360 , 360 );
        jd.setResizable( false );
        jd.setLocationRelativeTo(owner);
        jd.addWindowListener( new  WindowAdapter(){
             public   void  windowClosing(WindowEvent we){
                current = null ;
                jd.dispose();
            }
        });
        jd.setVisible( true );
    }
     public   void  actionPerformed(ActionEvent ae){
         if (ae.getSource() == fonts){
            fontName = (String)fonts.getSelectedItem();
            current = new  Font(fontName,fontStyle,fontSize);
            demo.setFont(current);
             this .repaint();
        } else   if (ae.getSource() == ok){
            jd.dispose();
        } else   if (ae.getSource() == cancel){
            current = null ;
            jd.dispose();
        }
    }
     public   void  valueChanged(ListSelectionEvent le){
         if (le.getSource() == face){
            String value = (String)face.getSelectedValue();
             if (value.equals( " 正常 " )){
                fontStyle = Font.PLAIN;
            } else   if (value.equals( " 粗体 " )){
                fontStyle = Font.BOLD;
            } else   if (value.equals( " 斜体 " )){
                fontStyle = Font.ITALIC;
            } else   if (value.equals( " 粗体+斜体 " )){
                fontStyle = Font.ITALIC | Font.BOLD;
            }
            current = new  Font(fontName,fontStyle,fontSize);
            demo.setFont(current);
             this .repaint();
        } else   if (le.getSource() == size){
            String sizeName = (String)size.getSelectedValue();
            sizeJT.setText(sizeName);
            fontSize = ht.get(sizeName);
            current = new  Font(fontName,fontStyle,fontSize);
            demo.setFont(current);
             this .repaint();
        }
    }
     public   static  Font showDialog(Frame owner,String title){
        JFontChooser jf = new  JFontChooser();
        jf.initWindow(title);
         return  jf.current;
    }
   
}