Java-Swing：使用HTML设置所选文本颜色

Question

我在查找如何使用HTML设置我的JList的选定文本的颜色时遇到问题。

使用Java Swing和HTML我已经设法为我的JList中的每个String的特定部分着色，我的示例如下所示：

在此输入图像描述

这是理想的，因为我可以为每个条目设置多种不同的颜色！

但是，选择文本时，只有默认的黑色文本变为白色！ html颜色的文本保持其颜色而不是变为白色，这导致一些非常难以阅读的文本的某些颜色：

在此输入图像描述

如何在选择时设置文本颜色？

我已经尝试在JList上使用JList的setSelectionForeground（Color.WHITE）方法，但它不影响html颜色的文本（尽管它确实影响了非html颜色的文本）

我还阅读了Oracle的HTML-in-Swing教程（我首先发现了HTML着色）但找不到解决方案。

这是我的简短示例的代码：

import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.UIManager;
import java.awt.Color;

public class JListSelectionColorTest extends JFrame {

    private String[] exampleText = {"Some example text without any color changes",
        "Some more example text without color changes",
        "Even more plain text!", 
        "<html>Uncolored Text! <font color=orange>Now some example Text with color!</font> more Uncolored Text!</html>", 
        "<html>Uncolored Text! <font color=green>And some more example text with color! Text, Text, Text!</font> more Uncolored Text!</html>",
        "<html>Uncolored Text! <font color=red>A string with red color, Text Text Text!</font> more Uncolored Text!</html>",
        "<html>Uncolored Text! <font color=blue>And finally a string with blue color, Text Text Text!</font> more Uncolored Text!</html>",
        "<html>Uncolored Text! <font color=purple><selection color=white>Testing if some html can turn the selection color white!</selection></font> more Uncolored Text!</html>"};

    public JListSelectionColorTest() {
        super("JList Selection Color Test");

        // Set the Look and Feel of the window to the Native System's Look and Feel
        // (When using the default Look and Feel the problem still persists!)
        try {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (Exception e) {
            e.printStackTrace();
        }

        // Create a JList of Strings containing the exampleText String array
        JList<String> exampleJList = new JList<String>(exampleText);

        // Set the JList's text selection color to white
        exampleJList.setSelectionForeground(Color.WHITE); // This doesn't seem to affect the html-colored text's selection foreground

        // Add the JList to the JFrame
        add(exampleJList);

        pack();
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        setVisible(true);
    }
    public static void main(String[] args) {
        new JListSelectionColorTest();
    }
}

Answer 1

一种方法是使用ListCellRenderer，它使用replaceAll（...）从您选择的String中删除HTML代码。 上帝我讨厌在HTML中使用正则表达式，如果您的String中包含非HTML尖括号<或> ，则无法使用。

import javax.swing.DefaultListCellRenderer;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.UIManager;

import java.awt.Color;
import java.awt.Component;

public class JListSelectionColorTest extends JFrame {

   private String[] exampleText = {
         "Some example text without any color changes",
         "Some more example text without color changes",
         "Even more plain text!",
         "<html>Uncolored Text! <font color=orange>Now some example Text with color!</font> more Uncolored Text!</html>",
         "<html>Uncolored Text! <font color=green>And some more example text with color! Text, Text, Text!</font> more Uncolored Text!</html>",
         "<html>Uncolored Text! <font color=red>A string with red color, Text Text Text!</font> more Uncolored Text!</html>",
         "<html>Uncolored Text! <font color=blue>And finally a string with blue color, Text Text Text!</font> more Uncolored Text!</html>",
         "<html>Uncolored Text! <font color=purple><selection color=white>Testing if some html can turn the selection color white!</selection></font> more Uncolored Text!</html>" };

   public JListSelectionColorTest() {
      super("JList Selection Color Test");

      try {
         UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
      } catch (Exception e) {
         e.printStackTrace();
      }
      JList<String> exampleJList = new JList<String>(exampleText);

      exampleJList.setCellRenderer(new MyCellRenderer());
      exampleJList.setSelectionForeground(Color.WHITE); 
      add(exampleJList);

      pack();
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      setLocationRelativeTo(null);
      setVisible(true);
   }

   public static void main(String[] args) {
      new JListSelectionColorTest();
   }

   private static class MyCellRenderer extends DefaultListCellRenderer {
      // create a non-greedy regex to capture anything between angle brackets.
      private String regex = "\\<.*?\\>";

      @Override
      public Component getListCellRendererComponent(JList<?> list,
            Object value, int index, boolean isSelected, boolean cellHasFocus) {
         if (value == null) {
            return super.getListCellRendererComponent(list, value, index,
                  isSelected, cellHasFocus);
         }

         // only interested in selected Strings
         if (isSelected) {
            String valueStr = value.toString(); // get the String
            valueStr = valueStr.replaceAll(regex, "");  // extract the HTML
            value = valueStr;  // put back into value Object variable
         }
         return super.getListCellRendererComponent(list, value, index,
               isSelected, cellHasFocus);
      }
   }
}

一个更好的解决方案：使用JSoup去除HTML。
更好的是，创建一个包含HTML和非HTML字符串的类，让List保持此类的对象，并在渲染器中交换字符串。

Java-Swing：使用HTML设置所选文本颜色

问题描述

1 个解决方案

解决方案1
5 已采纳 2014-03-27 22:13:26

Java-Swing：使用HTML设置所选文本颜色

问题描述

1 个解决方案

解决方案1 5 已采纳 2014-03-27 22:13:26

解决方案1
5 已采纳 2014-03-27 22:13:26