/
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.HierarchyEvent;
import java.awt.image.BufferedImage;
import java.awt.image.FilteredImageSource;
import java.awt.image.RGBImageFilter;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.Objects;
import java.util.Optional;
import java.util.stream.Stream;
import javax.swing.*;
import javax.swing.plaf.LayerUI;
public final class MainPanel extends JPanel {
private transient SwingWorker<String, Void> worker;
private MainPanel() {
super(new BorderLayout());
BoundedRangeModel model = new DefaultBoundedRangeModel();
JProgressBar progress1 = new JProgressBar(model);
progress1.setStringPainted(true);
JProgressBar progress2 = new JProgressBar(model);
progress2.setStringPainted(true);
JProgressBar progress3 = new JProgressBar(model);
progress3.setOpaque(false);
JProgressBar progress4 = new JProgressBar(model);
progress4.setOpaque(true); // for NimbusLookAndFeel
BlockedColorLayerUI<Component> layer = new BlockedColorLayerUI<>();
JPanel p = new JPanel(new GridLayout(2, 1));
p.add(makeTitledPanel("setStringPainted(true)", progress1, progress2));
p.add(makeTitledPanel("setStringPainted(false)", progress3, new JLayer<>(progress4, layer)));
JCheckBox check = new JCheckBox("Turn the progress bar red");
check.addActionListener(e -> {
boolean b = ((JCheckBox) e.getSource()).isSelected();
progress2.setForeground(b ? new Color(0x64_FF_00_00, true) : progress1.getForeground());
layer.setBlocking(b);
p.repaint();
});
JButton button = new JButton("Start");
button.addActionListener(e -> {
if (Objects.nonNull(worker) && !worker.isDone()) {
worker.cancel(true);
}
worker = new BackgroundTask();
worker.addPropertyChangeListener(new ProgressListener(progress1));
worker.execute();
});
Box box = Box.createHorizontalBox();
box.add(Box.createHorizontalGlue());
box.add(check);
box.add(Box.createHorizontalStrut(2));
box.add(button);
box.add(Box.createHorizontalStrut(2));
addHierarchyListener(e -> {
boolean displayability = (e.getChangeFlags() & HierarchyEvent.DISPLAYABILITY_CHANGED) != 0;
if (displayability && !e.getComponent().isDisplayable() && Objects.nonNull(worker)) {
// System.out.println("DISPOSE_ON_CLOSE");
worker.cancel(true);
// worker = null;
}
});
add(p);
add(box, BorderLayout.SOUTH);
setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
setPreferredSize(new Dimension(320, 240));
}
private static Component makeTitledPanel(String title, Component... list) {
JPanel p = new JPanel(new GridBagLayout());
p.setBorder(BorderFactory.createTitledBorder(title));
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.insets = new Insets(5, 5, 5, 5);
c.weightx = 1d;
c.gridx = GridBagConstraints.REMAINDER;
Stream.of(list).forEach(cmp -> p.add(cmp, c));
return p;
}
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.DISPOSE_ON_CLOSE);
// frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.getContentPane().add(new MainPanel());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
class BlockedColorLayerUI<V extends Component> extends LayerUI<V> {
private boolean blocking;
private transient BufferedImage buf;
@Override public void paint(Graphics g, JComponent c) {
if (blocking && c instanceof JLayer) {
Component view = ((JLayer<?>) c).getView();
Dimension d = view.getSize();
BufferedImage img = Optional.ofNullable(buf)
.filter(bi -> bi.getWidth() == d.width && bi.getHeight() == d.height)
.orElseGet(() -> new BufferedImage(d.width, d.height, BufferedImage.TYPE_INT_ARGB));
Graphics2D g2 = img.createGraphics();
// super.paint(g2, c);
view.paint(g2);
g2.dispose();
RGBImageFilter filter = new RedGreenChannelSwapFilter();
Image image = c.createImage(new FilteredImageSource(img.getSource(), filter));
g.drawImage(image, 0, 0, view);
buf = img;
} else {
super.paint(g, c);
}
}
public void setBlocking(boolean b) {
this.blocking = b;
}
}
class RedGreenChannelSwapFilter extends RGBImageFilter {
@Override public int filterRGB(int x, int y, int argb) {
int r = (argb >> 16) & 0xFF;
int g = (argb >> 8) & 0xFF;
return (argb & 0xFF_00_00_FF) | (g << 16) | (r << 8);
}
}
class BackgroundTask extends SwingWorker<String, Void> {
@Override protected String doInBackground() throws InterruptedException {
int current = 0;
int lengthOfTask = 100;
while (current <= lengthOfTask && !isCancelled()) {
doSomething();
setProgress(100 * current / lengthOfTask);
current++;
}
return "Done";
}
protected void doSomething() throws InterruptedException {
Thread.sleep(50);
}
}
class ProgressListener implements PropertyChangeListener {
private final JProgressBar progressBar;
protected ProgressListener(JProgressBar progressBar) {
this.progressBar = progressBar;
this.progressBar.setValue(0);
}
@Override public void propertyChange(PropertyChangeEvent e) {
boolean isProgress = "progress".equals(e.getPropertyName());
if (isProgress) {
progressBar.setIndeterminate(false);
progressBar.setValue((Integer) e.getNewValue());
}
}
}