fontdialog.java

简单的画图程序

package boya;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
class FontDialog extends JDialog implements ID,ActionListener
        ,ListSelectionListener{
 private DrawFrame window;
 private Font font;
 private int style;
 private int size;
 private JButton ok,cancel;
 private JList fontList;
 private JLabel fontDisplay;
 private JComboBox chooseSize;
 public FontDialog(DrawFrame window){
  super(window,"字体选择",true);
  this.window=window;
  font=window.getFont();
  style=font.getStyle();
  size=font.getSize();
  JPanel buttonPane=new JPanel();
  buttonPane.add(ok=createButton("确认")); 
  buttonPane.add(cancel=createButton("取消"));
  getContentPane().add(buttonPane,BorderLayout.SOUTH);
  JPanel dataPane=new JPanel();
  dataPane.setBorder(BorderFactory.createCompoundBorder(
       BorderFactory.createLineBorder(Color.black),
       BorderFactory.createEmptyBorder(5,5,5,5)));
  GridBagLayout gbLayout=new GridBagLayout();
  dataPane.setLayout(gbLayout);
  GridBagConstraints constraints=new GridBagConstraints();
  JLabel label=new JLabel("选择字体");
  constraints.fill=GridBagConstraints.HORIZONTAL;
  constraints.gridwidth=GridBagConstraints.REMAINDER;
  gbLayout.setConstraints(label,constraints);
  dataPane.add(label);
  GraphicsEnvironment e=GraphicsEnvironment.getLocalGraphicsEnvironment();
  String[] fonts=e.getAvailableFontFamilyNames();
  fontList=new JList(fonts);
  fontList.setValueIsAdjusting(true);
  fontList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
  fontList.setSelectedValue(font.getFamily(),true);
  fontList.addListSelectionListener(this);
  JScrollPane chooseFont=new JScrollPane(fontList);
  chooseFont.setMinimumSize(new Dimension(300,100));
  JPanel display=new JPanel();
  fontDisplay=new JLabel("字体样例:x X y Y z Z");
  fontDisplay.setPreferredSize(new Dimension(300,100));
  display.add(fontDisplay);
  JSplitPane splitPane=new JSplitPane(JSplitPane.VERTICAL_SPLIT,true,chooseFont,display);
  gbLayout.setConstraints(splitPane,constraints);
  dataPane.add(splitPane);
  JPanel sizePane=new JPanel();
  label=new JLabel("选择字体大小");
  sizePane.add(label);
  String[] sizeList={"8","10","12","14","16","18","20","22","24"};
  chooseSize=new JComboBox(sizeList);
  chooseSize.setSelectedItem(Integer.toString(size));
  chooseSize.addActionListener(this);
  sizePane.add(chooseSize);
  gbLayout.setConstraints(sizePane,constraints);
  dataPane.add(sizePane);
  JRadioButton bold=new JRadioButton("加粗",(style&Font.BOLD)>0);
  JRadioButton italic=new JRadioButton("斜体",(style&Font.ITALIC)>0);
  bold.addItemListener(new StyleListener(Font.BOLD));
  italic.addItemListener(new StyleListener(Font.ITALIC));
  JPanel stylePane=new JPanel();
  stylePane.add(bold);
  stylePane.add(italic);
  gbLayout.setConstraints(stylePane,constraints);
  dataPane.add(stylePane);
  getContentPane().add(dataPane,BorderLayout.CENTER);
  pack();
  setVisible(false);
 }
 JButton createButton(String label){
  JButton button=new JButton(label);
  button.setPreferredSize(new Dimension(80,20));
  button.addActionListener(this);
  return button;
 }
 public void actionPerformed(ActionEvent e){
  Object source=e.getSource();
  if(source==ok){
   window.setFont(font);
   setVisible(false);
  }
  else if(source==cancel)
   setVisible(false);
  else if(source==chooseSize){
   size=Integer.parseInt((String)chooseSize.getSelectedItem());
   font=font.deriveFont((float)size);
   fontDisplay.setFont(font);
   fontDisplay.repaint();
  }
 }
 public void valueChanged(ListSelectionEvent e){
  if(!e.getValueIsAdjusting()){
   font=new Font((String)fontList.getSelectedValue(),style,size);
   fontDisplay.setFont(font);
   fontDisplay.repaint();
  }
 }
 class StyleListener implements ItemListener{
  private int astyle;
  public StyleListener(int style){
   this.astyle=style;
  }
  public void itemStateChanged(ItemEvent e){
   if(e.getStateChange()==ItemEvent.SELECTED)
    style|=astyle;
   else style&=~astyle;
   font=font.deriveFont(style);
   fontDisplay.setFont(font);
   fontDisplay.repaint();
  }
 }  
}