如何更改 Java Swing TextArea 中的突出显示颜色?而且，更改与突出显示位置对应的文本的开头 [英] How to change highlighting color in Java Swing TextArea? And also, change the beginning of text corresponding to the highlighting location

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本文介绍了如何更改 Java Swing TextArea 中的突出显示颜色?而且，更改与突出显示位置对应的文本的开头的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

问题 1:通过使用 defaulthighlighter，我可以使焦点线变为蓝色.现在我想把它改成其他颜色.有谁知道怎么改这个参数? --- 解决了

Problem 1: BY using defaulthighlighter, I can make the focused lines change to blue. Now I want to change it to other colors. Do anyone know how to change this parameter? --- solved

问题 2:pos 是我要突出显示的子字符串的起始索引.我使用 setCaretPosition(pos);更新显示内容.但它总是出现在窗口的底部.我想把它放在顶部.谁能告诉我如何处理?

Problem 2: pos is the beginning index of my substring which I want to highlight. I use setCaretPosition(pos); to update the showing content. But it always appears at the bottom of the window. I want to have it at the top. Could anyone tell me how to deal with that?

我用一个演示来说明我的问题:

I use one demo to show my problem:

import java.awt.Color;
import java.net.MalformedURLException;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultHighlighter;

public class Test {
    public static void main(final String[] args) throws MalformedURLException {
        SwingUtilities.invokeLater(new Runnable() {

        @Override
        public void run() {
            try {
                init();
            } catch (BadLocationException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

        }
    });
}

private static void init() throws BadLocationException {
    JFrame frame = new JFrame();
    final JTextArea textArea = new JTextArea();
    JScrollPane pane = new JScrollPane(textArea);
    textArea.setText("Something. Something else.
A second line
a third line"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Something. Samething else.
A second line
a third line"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Something. Sbmething else.
A second line
a third line"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Something. Scmething else.
A second line
a third line"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Something. Sdmething else.
A second line
a third line"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Something. Semething else.
A second line
a third line"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Something. Sfmething else.
A second line
a third line"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Something. Sgmething else.
A second line
a third line"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
");
    textArea.setSelectionColor(Color.RED);
    frame.add(pane);
    frame.setSize(300, 120);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);

    String turnToString2 = "Sdmething else.
A second line
a third line"
            + "Blabla
Blabla
Blabla
Blabla
Blabla";
    int pos2 = textArea.getText().indexOf(turnToString2);
    textArea.getHighlighter().addHighlight(pos2,
            pos2 + turnToString2.length(),
            new DefaultHighlighter.DefaultHighlightPainter(Color.yellow));
    textArea.setCaretPosition(pos2);

结果是:

我希望它位于屏幕的右上方，但在此代码中，它显示在滚动窗格的底部.谁能知道如何改变这个?谢谢.

I want it to be at the right top of the screen but in this code, it is shown at the bottom of the scrollpane. Can anyone know how to change this? THanks.

推荐答案

您可以实现这一点，尽管不能直接实现，因为您必须保存对已添加到所述Highlight 的引用行，因此您必须遍历所有亮点以删除您想要的亮点，看看附加的程序，这可能会帮助您实现您想要的:

You can achieve this, though not directly, since you have to save the reference to the Highlight that you had added to the said line, hence you have to traverse through all the Highlights to remove the one you want, have a look at the program attached, might be this will help you to attain what you so desire :

最新新代码，删除了一些错误，似乎添加了与设置插入位置相关的所需功能

import java.awt.*;
import java.awt.event.*;
import java.util.Map;
import java.util.HashMap;
import javax.swing.*;
import javax.swing.text.*;

public class TextHighlight
{
    private JTextArea tarea;
    private JComboBox cbox;
    private JTextField lineField;
    private String[] colourNames = {"RED", "ORANGE", "CYAN"};

    private Highlighter.HighlightPainter redPainter;
    private Highlighter.HighlightPainter orangePainter;
    private Highlighter.HighlightPainter cyanPainter;   

    private int firstUpdateIndex;
    private int counter;

    private Map<Integer, Highlighter.Highlight> highlights = new HashMap<Integer, Highlighter.Highlight>();

    public TextHighlight()
    {
        redPainter = new DefaultHighlighter.DefaultHighlightPainter(Color.RED);
        orangePainter = new DefaultHighlighter.DefaultHighlightPainter(Color.ORANGE);
        cyanPainter = new DefaultHighlighter.DefaultHighlightPainter(Color.CYAN);

        firstUpdateIndex = -1;
        counter = 0;
    }

    private void createAndDisplayGUI()
    {
        final JFrame frame = new JFrame("Text HIGHLIGHT");
        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

        JPanel contentPane = new JPanel();
        contentPane.setBorder(BorderFactory.createTitledBorder(
                BorderFactory.createEmptyBorder(5, 5, 5, 5), "Highlighter JTextArea"));

        tarea = new JTextArea(10, 10);
        JScrollPane scrollPane = new JScrollPane(tarea);
        contentPane.add(scrollPane);

        JButton remHighButton = new JButton("REMOVE HIGHLIGHT");
        remHighButton.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent ae)
            {
                String input = JOptionPane.showInputDialog(frame, "Please Enter Start Index : "
                                                        , "Highlighting Options : "
                                                        , JOptionPane.PLAIN_MESSAGE);

                if (input != null && (highlights.size() > 0))
                {               
                    int startIndex = Integer.parseInt(input.trim());
                    Highlighter highlighter = tarea.getHighlighter();
                    highlighter.removeHighlight(highlights.get(startIndex));
                    tarea.setCaretPosition(startIndex);
                    tarea.requestFocusInWindow();
                    highlights.remove(startIndex);
                }
            }
        });

        JButton button = new JButton("HIGHLIGHT TEXT");
        button.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent ae)
            {
                String text = null;
                text = tarea.getSelectedText();
                if (text != null && text.length() > 0)
                {
                    int startIndex = tarea.getText().indexOf(text);
                    int endIndex = startIndex + text.length();
                    Highlighter highlighter = tarea.getHighlighter();

                    int selection = JOptionPane.showConfirmDialog(
                                            frame, getOptionPanel(), "Highlight Colour : "
                                                , JOptionPane.OK_CANCEL_OPTION
                                                , JOptionPane.PLAIN_MESSAGE);

                    System.out.println("TEXT : " + text);
                    System.out.println("START INDEX : " + startIndex);
                    System.out.println("END INDEX : " + endIndex);

                    if (selection == JOptionPane.OK_OPTION)
                    {
                        String colour = (String) cbox.getSelectedItem();
                        try
                        {
                            if (colour == colourNames[0])
                            {
                                System.out.println("Colour Selected : " + colour);
                                highlighter.addHighlight(startIndex, endIndex, redPainter);
                            }
                            else if (colour == colourNames[1])
                            {
                                System.out.println("Colour Selected : " + colour);
                                highlighter.addHighlight(startIndex, endIndex, orangePainter);
                            }
                            else if (colour == colourNames[2])
                            {
                                System.out.println("Colour Selected : " + colour);
                                highlighter.addHighlight(startIndex, endIndex, cyanPainter);
                            }
                            Highlighter.Highlight[] highlightIndex = highlighter.getHighlights();
                            System.out.println("Lengh of Highlights used : " + highlightIndex.length);
                            highlights.put(startIndex, highlightIndex[highlightIndex.length - 1]);
                        }
                        catch(BadLocationException ble)
                        {
                            ble.printStackTrace();
                        }
                    }
                    else if (selection == JOptionPane.CANCEL_OPTION)
                    {
                        System.out.println("CANCEL BUTTON PRESSED.");
                    }
                    else if (selection == JOptionPane.CLOSED_OPTION)
                    {
                        System.out.println("JOPTIONPANE CLOSED DELIBERATELY.");
                    }                   
                }
            }
        });

        frame.add(remHighButton, BorderLayout.PAGE_START);
        frame.add(contentPane, BorderLayout.CENTER);
        frame.add(button, BorderLayout.PAGE_END);

        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    private JPanel getOptionPanel()
    {
        JPanel panel = new JPanel();
        panel.setBorder(BorderFactory.createTitledBorder(
                        BorderFactory.createLineBorder(Color.DARK_GRAY, 2), "COLOUR SELECTION"));
        panel.setLayout(new GridLayout(0, 2, 5, 5));

        JLabel colourLabel = new JLabel("Select One Colour : ");
        cbox = new JComboBox(colourNames);

        panel.add(colourLabel);
        panel.add(cbox);

        return panel;
    }

    public static void main(String... args)
    {
        SwingUtilities.invokeLater(new Runnable()
        {
            public void run()
            {
                new TextHighlight().createAndDisplayGUI();
            }
        });
    }
}

输出:

开始:

突出显示第一行 第二行

删除高光

用不同的颜色突出显示同一行

与问题中的示例代码一致的最新编辑

import java.awt.*;
import java.net.MalformedURLException;

import javax.swing.*;
import javax.swing.text.*;

public class Test {
    public static void main(final String[] args) throws MalformedURLException {
        SwingUtilities.invokeLater(new Runnable() {

        @Override
        public void run() {
            try {
                init();
            } catch (BadLocationException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

        }
    });
}

private static void init() throws BadLocationException {
    JFrame frame = new JFrame();
    final JTextArea textArea = new JTextArea();
    JScrollPane pane = new JScrollPane(textArea);
    textArea.setText("Something. Something else.
A second line
a third line"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Something. Samething else.
A second line
a third line"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Something. Sbmething else.
A second line
a third line"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Something. Scmething else.
A second line
a third line"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Something. Sdmething else.
A second line
a third line"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Something. Semething else.
A second line
a third line"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Something. Sfmething else.
A second line
a third line"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Something. Sgmething else.
A second line
a third line"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
"
            + "Blabla
Blabla
Blabla
Blabla
Blabla
Blabla
");
    textArea.setSelectionColor(Color.RED);
    frame.add(pane);
    frame.setSize(300, 120);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);

    String turnToString2 = "Sdmething else.
A second line
a third line"
            + "Blabla
Blabla
Blabla
Blabla
Blabla";
    int pos2 = textArea.getText().indexOf(turnToString2);
    Rectangle startIndex = textArea.modelToView(pos2);
    textArea.getHighlighter().addHighlight(pos2,
            pos2 + turnToString2.length(),
            new DefaultHighlighter.DefaultHighlightPainter(Color.yellow));    
    int y = startIndex.y + (pane.getHeight() - 10);
    System.out.println("Pane Height : " + pane.getHeight());
    System.out.println("X : " + startIndex.x);
    System.out.println("Y : " + y);
    System.out.println("Y (pos2) : " + startIndex.y);
    textArea.setCaretPosition(textArea.viewToModel(new Point(startIndex.x, y)));
    pane.scrollRectToVisible(new Rectangle(startIndex.x, y));
    }
}

这是输出:

这篇关于如何更改 Java Swing TextArea 中的突出显示颜色?而且，更改与突出显示位置对应的文本的开头的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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