[英]Highlight one specific row/line in JTextArea
我正在尝试仅突出显示JTextArea
特定行,但是我对此一无所知。 我需要获取特定行,然后突出显示它。 我已经阅读了其他文章,但是我仍然不明白如何将其组合起来以解决我的问题...帮助将不胜感激。
尝试使用此代码示例,并询问是否不清楚:
import java.awt.*;
import java.awt.event.*;
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 painter;
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 button = new JButton("HIGHLIGHT TEXT");
button.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
int selection = JOptionPane.showConfirmDialog(
frame, getOptionPanel(), "Highlighting Options : ", JOptionPane.OK_CANCEL_OPTION
, JOptionPane.PLAIN_MESSAGE);
if (selection == JOptionPane.OK_OPTION)
{
System.out.println("OK Selected");
int lineNumber = Integer.parseInt(lineField.getText().trim());
try
{
int startIndex = tarea.getLineStartOffset(lineNumber);
int endIndex = tarea.getLineEndOffset(lineNumber);
String colour = (String) cbox.getSelectedItem();
if (colour == colourNames[0])
{
System.out.println("RED Colour");
painter = new DefaultHighlighter.DefaultHighlightPainter(Color.RED);
tarea.getHighlighter().addHighlight(startIndex, endIndex, painter);
}
else if (colour == colourNames[1])
{
System.out.println("ORANGE Colour");
painter = new DefaultHighlighter.DefaultHighlightPainter(Color.ORANGE);
tarea.getHighlighter().addHighlight(startIndex, endIndex, painter);
}
else if (colour == colourNames[2])
{
System.out.println("CYAN Colour");
painter = new DefaultHighlighter.DefaultHighlightPainter(Color.CYAN);
tarea.getHighlighter().addHighlight(startIndex, endIndex, painter);
}
}
catch(BadLocationException ble)
{
ble.printStackTrace();
}
}
else if (selection == JOptionPane.CANCEL_OPTION)
{
System.out.println("CANCEL Selected");
}
else if (selection == JOptionPane.CLOSED_OPTION)
{
System.out.println("JOptionPane closed deliberately.");
}
}
});
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.setLayout(new GridLayout(0, 2, 5, 5));
JLabel lineNumberLabel = new JLabel("Enter Line Number : ");
lineField = new JTextField(10);
JLabel colourLabel = new JLabel("Select One Colour : ");
cbox = new JComboBox(colourNames);
panel.add(lineNumberLabel);
panel.add(lineField);
panel.add(colourLabel);
panel.add(cbox);
return panel;
}
public static void main(String... args)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
new TextHighlight().createAndDisplayGUI();
}
});
}
}
这是它的输出:
如果无法选择TextArea到TextField,则单击按钮会导致JTextArea失去焦点,因此不会显示其选择。 在按钮单击事件上使用btnImport.transferFocusBackward();
解决问题。
这样做:这是Java的文本区域摆动
JTextArea area = new JTextArea();
int startIndex = area.getLineStartOffset(2);
int endIndex = area.getLineEndOffset(2);
painter = new DefaultHighlighter.DefaultHighlightPainter(Color.RED);
area.getHighlighter().addHighlight(startIndex, endIndex, painter);
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.