JTextArea和JTextPane字体呈现

Question

看来JTextPane和JTextArea呈现不同的字体。它几乎不明显，但我仍然想知道它为什么在那里。

我已经建立了一个SSCCE，但你不能真正看到它。最好的方法是使用JTextArea运行程序，然后将代码更改为JTextPane并再次运行。它们应该以某种方式重叠，即当您从一个窗口切换到另一个窗口时（使用alt +制表符），可以看到差异。你将不得不提供你自己的* .ttf文件。

这是为什么？有没有办法强制JTextPane以与JTextArea相同的方式呈现文本？

SSCCE：

import java.awt.Font; 
import java.awt.FontFormatException; 
import java.awt.event.FocusEvent; 
import java.awt.event.FocusListener; 
import java.io.IOException; 

import javax.swing.BoxLayout; 
import javax.swing.JFrame; 
import javax.swing.JTextArea; 
import javax.swing.JTextPane; 
import javax.swing.UIManager; 
import javax.swing.UIManager.LookAndFeelInfo; 
import javax.swing.UnsupportedLookAndFeelException; 


public class Main 
{ 
public static void main(String[] args) 
{ 
    for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) 
    { 
     if ("Nimbus".equals(info.getName())) 
     { 
      try 
      { 
       UIManager.setLookAndFeel(info.getClassName()); 
      } 
      catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException e) 

      { 
       System.out.println("No Nimbus!"); 
      } 

      break; 
     } 
    } 

    JFrame a = new JFrame("Test"); 
    a.setSize(600, 900); 
    a.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    a.getContentPane().setLayout(new BoxLayout(a.getContentPane(), BoxLayout.Y_AXIS)); 

    Font d = null; 

    try 
    { 
     d = Font.createFont(Font.TRUETYPE_FONT, Main.class.getResourceAsStream("calibri_bold.ttf")); 
     d = d.deriveFont(23f); 
    } 

    catch (FontFormatException | IOException e1) 
    { 
     // TODO Auto-generated catch block 
     e1.printStackTrace(); 
    } 

    final JTextPane b = new JTextPane(); 



    b.setBorder(new JTextArea().getBorder()); 
    b.setFont(d); 

    b.addFocusListener(new FocusListener() { 

     @Override 
     public void focusGained(FocusEvent arg0) { 
      b.repaint(); 
     } 

     @Override 
     public void focusLost(FocusEvent arg0) { 
      b.repaint(); 
     } 

    }); 
    b.setText("It seems that JTextPane and JTextArea are rendering fonts differently. It is barely noticeable, but I still want to know why is it there. I have set up a SSCCE, but you can't really see it. Best method would be to run a program with JTextArea, then change the code to JTextPane and run it again. They should overlap in a way when you change from one window to the other (with alt+ tab) the difference can be seen. Why is that? Is there a way to force the JTextPane to render the text the same way as JTextArea does?"); 
    a.getContentPane().add(b); 

    final JTextArea c = new JTextArea(); 


    c.setFont(d); 
    c.setText("It seems that JTextPane and JTextArea are rendering fonts differently. It is barely noticeable, but I still want to know why is it there. I have set up a SSCCE, but you can't really see it. Best method would be to run a program with JTextArea, then change the code to JTextPane and run it again. They should overlap in a way when you change from one window to the other (with alt+ tab) the difference can be seen. Why is that? Is there a way to force the JTextPane to render the text the same way as JTextArea does?"); 
    c.setLineWrap(true); 
    c.setWrapStyleWord(true); 
    a.getContentPane().add(c); 

    a.setVisible(true); 
} 
} 

Answer 1

• Nimbus L&F有几个awfull问题，我们可以称这些问题为Bugs

• JTextArea和另一JComponents已UIManager

冻结一些 Keys

• 你可以去UIManager.getLookAndFeel().uninitialize();大多数按键他们是冻结的，但他们中的一些能够抵抗所有的变化，黑客woodoo，但对于Font是JTextArea不是这种情况下

• 注意你需要重写所有键3次，不如demonstratedin我的代码，看到main class

在 UIManager评论 //...Defaults.put("TextPane.font", res);

初步改变

• UIManager.getLookAndFeel().uninitialize()之后;被称为

import java.awt.Font; 
import java.awt.GridLayout; 
import java.awt.event.ActionEvent; 
import java.util.logging.Level; 
import java.util.logging.Logger; 
import javax.swing.AbstractAction; 
import javax.swing.Action; 
import javax.swing.JFrame; 
import javax.swing.JScrollPane; 
import javax.swing.JTextArea; 
import javax.swing.JTextPane; 
import javax.swing.LookAndFeel; 
import javax.swing.SwingUtilities; 
import javax.swing.UIDefaults; 
import javax.swing.UIManager; 
import javax.swing.UIManager.LookAndFeelInfo; 
import javax.swing.UnsupportedLookAndFeelException; 
import javax.swing.plaf.FontUIResource; 

public class Main { 

    private JFrame frame = new JFrame("Test"); 
    private JTextPane textPane = new JTextPane(); 
    private JTextArea textArea = new JTextArea(); 
    private String str = "It seems that JTextPane and JTextArea are rendering fonts differently. " 
      + "It is barely noticeable, but I still want to know why is it there. " 
      + "I have set up a SSCCE, but you can't really see it. Best method would " 
      + "be to run a program with JTextArea, then change the code to JTextPane " 
      + "and run it again. They should overlap in a way when you change from one " 
      + "window to the other (with alt+ tab) the difference can be seen. " 
      + "Why is that? Is there a way to force the JTextPane to render the " 
      + "text the same way as JTextArea does?"; 
    private javax.swing.Timer timer = null; 
    final Font fnt = new Font("Brodway", Font.BOLD, 10); 

    public Main() { 
     textPane.setBorder(new JTextArea().getBorder()); 
     textPane.setText(str); 
     textArea.setText(str); 
     textArea.setLineWrap(true); 
     textArea.setWrapStyleWord(true); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     frame.setLayout(new GridLayout(0, 1)); 
     frame.add(new JScrollPane(textPane)); 
     frame.add(new JScrollPane(textArea)); 
     frame.setVisible(true); 
     frame.setSize(400, 400); 
     start(); 
    } 

    private void start() { 
     timer = new javax.swing.Timer(2250, updateCol()); 
     timer.setRepeats(false); 
     timer.start(); 
    } 

    public Action updateCol() { 
     return new AbstractAction("text load action") { 
      private static final long serialVersionUID = 1L; 

      @Override 
      public void actionPerformed(ActionEvent e) { 

       try { 
        LookAndFeel lnf = UIManager.getLookAndFeel().getClass().newInstance(); 
        final FontUIResource res = new FontUIResource(fnt); 
        UIDefaults uiDefaults = lnf.getDefaults(); 
        //uiDefaults.put("TextPane.font", res); 
        uiDefaults.put("TextArea.font", res); 
        UIManager.getLookAndFeel().uninitialize(); 
        UIManager.setLookAndFeel(lnf); 
       } catch (InstantiationException ex) { 
        Logger.getLogger(SystemFontDisplayer.class.getName()).log(Level.SEVERE, null, ex); 
       } catch (IllegalAccessException ex) { 
        Logger.getLogger(SystemFontDisplayer.class.getName()).log(Level.SEVERE, null, ex); 
       } catch (UnsupportedLookAndFeelException ex) { 
        Logger.getLogger(SystemFontDisplayer.class.getName()).log(Level.SEVERE, null, ex); 
       } 
       UIDefaults defaults = UIManager.getDefaults(); 
       final FontUIResource res = new FontUIResource(fnt); 
       //defaults.put("TextPane.font", res); 
       defaults.put("TextArea.font", res); 
       SwingUtilities.updateComponentTreeUI(frame); 
      } 
     }; 
    } 

    public static void main(String[] args) { 
     final FontUIResource res = new FontUIResource(new Font("Algerian", Font.BOLD, 10)); 
     for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) { 
      if ("Nimbus".equals(info.getName())) { 
       try { 
        UIManager.setLookAndFeel(info.getClassName()); 
        UIDefaults defaults = UIManager.getDefaults(); 
        defaults.put("TextPane.font", res); 
        defaults.put("TextArea.font", res); 
       } catch (ClassNotFoundException | InstantiationException | 
         IllegalAccessException | UnsupportedLookAndFeelException e) { 
        System.out.println("No Nimbus!"); 
       } 
       break; 
      } 
     } 
     java.awt.EventQueue.invokeLater(new Runnable() { 
      @Override 
      public void run() { 
       new Main(); 
      } 
     }); 
    } 
}