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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 java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.font.FontRenderContext;
import java.awt.font.TextLayout;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.util.Objects;
import javax.swing.*;
public final class MainPanel extends JPanel {
private static final FontRenderContext FRC = new FontRenderContext(null, true, true);
private static final Font FONT = new Font(Font.SERIF, Font.PLAIN, 300);
private transient JFrame frame;
private MainPanel() {
super();
JTextField textField = new JTextField("★", 20);
JLabel label = new JLabel("", SwingConstants.CENTER);
JToggleButton button = new JToggleButton("show");
button.addActionListener(e -> {
AbstractButton btn = (AbstractButton) e.getSource();
if (Objects.isNull(frame)) {
frame = new JFrame();
frame.setUndecorated(true);
frame.setAlwaysOnTop(true);
frame.setDefaultCloseOperation(WindowConstants.HIDE_ON_CLOSE);
frame.getContentPane().add(label);
frame.getContentPane().setBackground(Color.GREEN);
frame.pack();
}
if (btn.isSelected()) {
String str = textField.getText().trim();
// label.setText(str);
TextLayout tl = new TextLayout(str, FONT, FRC);
Rectangle2D b = tl.getBounds();
Shape shape = tl.getOutline(AffineTransform.getTranslateInstance(-b.getX(), -b.getY()));
// int w = 300;
// int h = 300;
// GeneralPath p = new GeneralPath();
// p.moveTo(-w / 4f, -h / 12f);
// p.lineTo(+w / 4f, -h / 12f);
// p.lineTo(-w / 6f, +h / 4f);
// p.lineTo( 0f, -h / 4f);
// p.lineTo(+w / 6f, +h / 4f);
// p.closePath();
// AffineTransform at = AffineTransform.getTranslateInstance(w / 4, h / 4);
// shape = at.createTransformedShape(p);
frame.setBounds(shape.getBounds());
// frame.setSize(shape.getBounds().width, shape.getBounds().height);
// AWTUtilities.setWindowShape(frame, shape); // JDK 1.6.0
frame.setShape(shape); // JDK 1.7.0
frame.setLocationRelativeTo(btn.getRootPane());
frame.setVisible(true);
} else {
frame.setVisible(false);
}
});
add(textField);
add(button);
DragWindowListener dwl = new DragWindowListener();
label.addMouseListener(dwl);
label.addMouseMotionListener(dwl);
setPreferredSize(new Dimension(320, 240));
}
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);
}
}
class DragWindowListener extends MouseAdapter {
private final Point startPt = new Point();
@Override public void mousePressed(MouseEvent e) {
if (SwingUtilities.isLeftMouseButton(e)) {
startPt.setLocation(e.getPoint());
}
}
@Override public void mouseDragged(MouseEvent e) {
Component c = SwingUtilities.getRoot(e.getComponent());
if (c instanceof Window && SwingUtilities.isLeftMouseButton(e)) {
Point pt = c.getLocation();
c.setLocation(pt.x - startPt.x + e.getX(), pt.y - startPt.y + e.getY());
}
}
}