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MainPanel.java
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MainPanel.java
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// -*- mode:java; encoding:utf-8 -*-
// vim:set fileencoding=utf-8:
// @homepage@
package example;
import java.awt.*;
import javax.swing.*;
import javax.swing.text.MutableAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyleContext;
import javax.swing.text.TabSet;
import javax.swing.text.TabStop;
public final class MainPanel extends JPanel {
private MainPanel() {
super(new BorderLayout());
JTextPane textPane = new JTextPane();
textPane.setFont(new Font(Font.MONOSPACED, Font.PLAIN, 12));
FontMetrics fm = textPane.getFontMetrics(textPane.getFont());
float charWidth = fm.charWidth('m');
float tabWidth = charWidth * 4f;
TabStop[] tabs = new TabStop[10];
for (int j = 0; j < tabs.length; j++) {
tabs[j] = createTabStop((j + 1) * tabWidth);
}
TabSet tabSet = new TabSet(tabs);
// MutableAttributeSet attributes = new SimpleAttributeSet();
MutableAttributeSet attributes = textPane.getStyle(StyleContext.DEFAULT_STYLE);
StyleConstants.setTabSet(attributes, tabSet);
// int length = textPane.getDocument().getLength();
// textPane.getStyledDocument().setParagraphAttributes(0, length, attributes, false);
textPane.setParagraphAttributes(attributes, false);
textPane.setText("JTextPane\n0123\n\t4567\n\t\t89ab\n");
JTextArea textArea = new JTextArea();
textArea.setTabSize(4);
textArea.setText("JTextArea\n0123\n\t4567\n\t\t89ab\n");
add(new JScrollPane(textArea), BorderLayout.NORTH);
add(new JScrollPane(textPane));
setPreferredSize(new Dimension(320, 240));
}
private static TabStop createTabStop(float pos) {
return new TabStop(pos);
}
public static void main(String[] args) {
EventQueue.invokeLater(MainPanel::createAndShowGui);
}
private static void createAndShowGui() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (UnsupportedLookAndFeelException ignored) {
Toolkit.getDefaultToolkit().beep();
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException ex) {
ex.printStackTrace();
return;
}
JFrame frame = new JFrame("@title@");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.getContentPane().add(new MainPanel());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}