看来JTextPane和JTextArea呈现字体的方式有所不同。它几乎不引人注意，但是我仍然想知道为什么在那儿。
我已经建立了SSCCE，但是您看不到它。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。它们应该以一种方式重叠，当您从一个窗口切换到另一个窗口（使用alt +选项卡）时，可以看到差异。您将必须提供自己的* .ttf文件。
这是为什么？有没有一种方法可以强制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);
}
}
最佳答案
Nimbus L&F有一些严重的问题，我们可以将这些问题称为BugsJTextArea和另一个JComponents已冻结Keys中的某些UIManager
您可以将大多数已冻结的键设置为UIManager.getLookAndFeel().uninitialize();，但是其中一些键可以抵御所有更改，黑客攻击，woodoo，但是Font的JTextArea并非这种情况
请注意，您需要重写所有键3次，而不是我的代码中所演示的，请参见注释//...Defaults.put("TextPane.font", res);UIManager从main class的初始变化
在UIManager.getLookAndFeel().uninitialize()之后；叫做
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();
}
});
}
}
关于java - JTextArea和JTextPane字体渲染，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/19458099/