JTextPane / JTextField奇怪的行为与稀有字符

时间:2012-10-15 19:20:40

标签: java swing jtextfield jtextpane

我在JTextPane / JTextField中发现了一个奇怪的错误(或者在它们下面的字体渲染中的某个地方)。我想知道是否有其他人遇到过同样的事情并且可能有解决方案。

我正在尝试在JTextPane中显示一些“特殊”或罕见的字符,并且一旦我更改了JTextField的字体(这与JTextPane完全无关!),JTextPane就会“分解”,并且没有更长时间显示这些字符。

这应该可以更好地解释我的意思:

public class Scrap {

public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.setLayout(new BorderLayout());

    JTextField field = new JTextField();

    // Uncomment this line... and the JTextPane nor the JTextField
    // no longer display the characters
    // field.setFont(new Font("Arial", Font.PLAIN, 14));

    frame.add(field, BorderLayout.SOUTH);

    JTextPane textPane = new JTextPane();
    textPane.setFont(new Font("Arial", Font.PLAIN, 14));

    JScrollPane scroll = new JScrollPane(textPane);
    frame.add(scroll, BorderLayout.CENTER);

    StyledDocument doc = (StyledDocument) textPane.getDocument();

    try {
        String str = "◕ ◡◡ ◕";

        doc.insertString(doc.getLength(), str, null);

    } catch (BadLocationException e) {
        e.printStackTrace();
    }

    frame.setVisible(true);
    frame.setLocationRelativeTo(null);
}
}
编辑:这是问题的一个更好的例子。它似乎与Font的大小有关。移动滑块,您会注意到大小14不会渲染字形,而14恰好是JTextField字体的大小。

import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.text.*;
import java.awt.*;

public class Scrap {

public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(600, 200);
    frame.setLayout(new BorderLayout());

    final JTextField field = new JTextField(10);

    final JTextPane textPane = new JTextPane();

    StyledDocument doc = (StyledDocument) textPane.getDocument();

    JPanel panel = new JPanel();
    frame.add(panel, BorderLayout.SOUTH);

    // Set the Font of the JTextField, and the JTextPane
    // no longer displays the text of that size correctly...

    int changeMe = 14;

    field.setFont(new Font("Tahoma", Font.PLAIN, changeMe));

    // If we change the Font Family, the problem goes away...
    // field.setFont(new Font("Dialog", Font.PLAIN, 14));

    panel.add(field);

    final JLabel label = new JLabel();

    final JSlider slider = new JSlider(6, 32);
    slider.addChangeListener(new ChangeListener() {
        @Override
        public void stateChanged(ChangeEvent e) {
            textPane.setFont(new Font("Tahoma", Font.PLAIN, slider.getValue()));

            textPane.selectAll();

            SimpleAttributeSet attr = new SimpleAttributeSet();
            StyleConstants.setFontSize(attr, slider.getValue());
            textPane.setCharacterAttributes(attr, true);

            label.setText("" + slider.getValue());
        }
    });

    slider.setValue(14);

    panel.add(slider);

    panel.add(label);

    JScrollPane scroll = new JScrollPane(textPane);
    frame.add(scroll, BorderLayout.CENTER);

    Style s = doc.addStyle("test", null);

    try {
        String str = "◕ ◡◡ ◕";

        doc.insertString(doc.getLength(), str, doc.getStyle("test"));

    } catch (BadLocationException e) {
        e.printStackTrace();
    }

    frame.setVisible(true);
    frame.setLocationRelativeTo(null);
}
}

3 个答案:

答案 0 :(得分:2)

没有最深刻的想法发生了什么,而不是为什么,但必须设置

textPane.setContentType("text/html");

enter image description here

import java.awt.BorderLayout;
import java.awt.Font;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.JTextPane;
import javax.swing.SwingUtilities;
import javax.swing.text.BadLocationException;
import javax.swing.text.StyledDocument;

public class Scrap {


    public  Scrap() {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(200, 200);
        frame.setLayout(new BorderLayout());
        JTextField field = new JTextField();
        // Uncomment this line... and the JTextPane nor the JTextField
        // no longer display the characters
        field.setFont(new Font("Arial", Font.PLAIN, 14));
        frame.add(field, BorderLayout.SOUTH);
        JTextPane textPane = new JTextPane();
        textPane.setFont(new Font("Arial", Font.PLAIN, 14));
        textPane.setContentType("text/html");
        JScrollPane scroll = new JScrollPane(textPane);
        frame.add(scroll, BorderLayout.CENTER);
        StyledDocument doc = (StyledDocument) textPane.getDocument();
        try {
            String str = "\uD0180, \u2460, \u2760, \u2380, \u2C60, \u5000, \u03E0";
            doc.insertString(doc.getLength(), str, null);
        } catch (BadLocationException e) {
            e.printStackTrace();
        }
        frame.setVisible(true);
        frame.setLocationRelativeTo(null);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                Scrap fs = new Scrap();
            }
        });
    }
}

答案 1 :(得分:1)

当我尝试创建一个必须支持多种语言的应用程序(包括带有“非标准”字符的语言,例如中文)时,我遇到了类似的问题。我曾经将我的小部件的字体设置为Arial,并且遇到了问题。以下解决方案解决了我的问题,但它可能无法解决您的问题。

Java遇到无法显示的特定字符集中的字符时,会有一个回退机制。它可以使用随JRE提供的fontconfig.properties文件进行配置(该文件最初提供为“fontconfig.properties.src”,您必须手动重命名)。

当您强制使用不属于DialogSerifSansSerifMonospacedDialogInput的字体时,Java无法使用不同的字符集,如果当前的字符串(在你的情况下为Arial)不能代表你试图在屏幕上绘制的字符(或字形)。

如果查看fontconfig.properties.src文件,您会看到许多类型的字体有许多条目(例如Dialog.plainSerif.bold等)。这些是上述字体无法显示特定字形时使用的实际后备字体。因此,设置小部件的字体让我们说Font.DIALOG将允许Java尝试使用字体列表来显示您的字符。

有关更多信息,请访问Oracle网站(here for Java 7)。请注意,Oracle不正式支持使用fontconfig.properties。

答案 2 :(得分:0)

简单模拟字体和字形,

import java.awt.*;
import javax.swing.*;
import javax.swing.text.*;

public class Fonts implements Runnable {

    private String[] fnt;
    private JFrame frm;
    private JScrollPane jsp;
    private JTextPane jta;
    private JTextField field;
    private int width = 450;
    private int height = 300;
    private GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
    private StyledDocument doc;
    private MutableAttributeSet mas;
    private int cp = 0;
    private Highlighter.HighlightPainter cyanPainter = new DefaultHighlighter.DefaultHighlightPainter(Color.cyan);
    private Highlighter.HighlightPainter redPainter = new DefaultHighlighter.DefaultHighlightPainter(Color.red);
    private Highlighter.HighlightPainter whitePainter = new DefaultHighlighter.DefaultHighlightPainter(Color.white);
    private int _count = 0;
    private int _lenght = 0;

    public Fonts() {
        jta = new JTextPane();
        doc = jta.getStyledDocument();
        jsp = new JScrollPane(jta);
        jsp.setPreferredSize(new Dimension(height, width));
        frm = new JFrame("awesome");
        frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frm.setLayout(new BorderLayout());
        frm.add(jsp, BorderLayout.CENTER);
        field = new JTextField();
        field.setText("\u2460, \u2760, \u2380, \u2C60, \u5000, \u03E0");
        frm.add(field, BorderLayout.SOUTH);
        frm.setLocation(100, 100);
        frm.pack();
        frm.setVisible(true);
        jta.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
        fnt = ge.getAvailableFontFamilyNames();
        mas = jta.getInputAttributes();
        new Thread(this).start();
    }

    @Override
    public void run() {
        for (int i = 0; i < fnt.length; i++) {
            StyleConstants.setBold(mas, false);
            StyleConstants.setItalic(mas, false);
            StyleConstants.setFontFamily(mas, fnt[i]);
            StyleConstants.setFontSize(mas, 16);
            //dis(fnt[i]);
            dis("\u2460, \u2760, \u2380, \u2C60, \u5000, \u03E0");
            field.setFont(new Font(fnt[i], Font.PLAIN, 14));
            try {
                Thread.sleep(450);
            } catch (Exception e) {
                e.printStackTrace();
            }
            /*StyleConstants.setBold(mas, true);
            dis(fnt[i] + " Bold");
            try {
                Thread.sleep(75);
            } catch (Exception e) {
                e.printStackTrace();
            }
            StyleConstants.setItalic(mas, true);
            dis(fnt[i] + " Bold & Italic");
            try {
                Thread.sleep(75);
            } catch (Exception e) {
                e.printStackTrace();
            }
            StyleConstants.setBold(mas, false);
            dis(fnt[i] + " Italic");
            try {
                Thread.sleep(75);
            } catch (Exception e) {
                e.printStackTrace();
            }*/
        }
        jta.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
    }

    public void dis(String s) {
        _count++;
        _lenght = jta.getText().length();
        try {
            doc.insertString(cp, s, mas);
            doc.insertString(cp, "\n", mas);
        } catch (Exception bla_bla_bla_bla) {
            bla_bla_bla_bla.printStackTrace();
        }
        if (_count % 2 == 0) {
            try {
                jta.getHighlighter().addHighlight(1, _lenght - 1, cyanPainter);
            } catch (BadLocationException bla_bla_bla_bla) {
            }
        } else if (_count % 3 == 0) {
            try {
                jta.getHighlighter().addHighlight(1, _lenght - 1, redPainter);
            } catch (BadLocationException bla_bla_bla_bla) {
            }
        } else {
            try {
                jta.getHighlighter().addHighlight(1, _lenght - 1, whitePainter);
            } catch (BadLocationException bla_bla_bla_bla) {
            }
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                Fonts fs = new Fonts();
            }
        });
    }
}