How to highlight all the text in a JTextPane?

问题

jTextPane1.selectAll();

With the correctly shared events, that command permit to highlight the text in a JTextPane area (I am a bit rusty, I need to not forget to share the "good event focus priorities" ; thank you to : MadProgrammer)

回答1:

Since selectAll is a method of JTextComponent, which JTextPane extends from I would take a wild guess and say, probably, yes.

Five minutes of coding probably would have gotten you the same answer yourself...

Highlighting not seem to appear in the jTextPane area (note : I use Java 7)

This is likely because the JTextPane doesn't have focus, try using requestFocusInWindow to bring keyboard focus back to the JTextPane.

The JTextComponents don't always render selection highlighting when they don't have focus.

For example...

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class TestTextPane {

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

    public TestTextPane() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                final JTextPane tp = new JTextPane();
                JButton withFocus = new JButton("Select with focus");
                withFocus.addActionListener(new ActionListener() {
                    @Override
                    public void actionPerformed(ActionEvent e) {
                        tp.selectAll();
                        tp.requestFocus();
                    }
                });
                JButton withOutFocus = new JButton("Select without focus");
                withFocus.addActionListener(new ActionListener() {
                    @Override
                    public void actionPerformed(ActionEvent e) {
                        tp.selectAll();
                    }
                });


                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new JScrollPane(tp));
                JPanel panel = new JPanel();
                panel.add(withFocus);
                panel.add(withOutFocus);
                frame.add(panel, BorderLayout.SOUTH);
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }        
}

You could also test it by using

textPane.selectAll();
System.out.println(textPane.getSelectedText());

For example...

And now with double clicking

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class TestTextPane {

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

    public TestTextPane() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                final JTextPane tp = new JTextPane();
                JButton withFocus = new JButton("Select with focus");
                tp.addMouseListener(new MouseAdapter() {

                    @Override
                    public void mouseClicked(MouseEvent e) {
                        if (e.getClickCount() == 2 && SwingUtilities.isLeftMouseButton(e)) {
                            tp.selectAll();
                        }
                    }

                });

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new JScrollPane(tp));
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }
}

来源：https://stackoverflow.com/questions/22624869/how-to-highlight-all-the-text-in-a-jtextpane