I've Googled around and could not find an answer:
I have a JFrame as a GUI and set a componentListener like
this.addComponentListener(new CL(this, logger));
In the componentListener I have the componentResized, etc...
public void componentResized(ComponentEvent e) {
if (e.getSource() == gui) {
here I do the code
}
}
Everything is working fine under Java 6, but under Java 7, the Jframe is being resized but is not being repainted: the component listener is not getting called
I tried some alternatives from StackOverflow in the way of coding, but no way to make it work.
When I minimize the GUI window and restore it, then "componentResized" is being called.
Anyone an idea what's going on and why it works under Java 6 and not Java 7.
Here is a sample code:
public class Frame extends JFrame {
private JPanel panel;
public Frame() {
super();
getContentPane().setBounds(new Rectangle(0, 0, 200, 200));
getContentPane().setLayout(null);
getContentPane().add(getPanel());
this.addComponentListener(new ComponentListener() {
@Override
public void componentResized(ComponentEvent e) {
System.out.println("Window Resized: Frame");}
@Override
public void componentMoved(ComponentEvent e) {}
@Override
public void componentShown(ComponentEvent e) {}
@Override
public void componentHidden(ComponentEvent e) {}});
this.setSize(200, 200);
this.setPreferredSize(new Dimension(200, 200));
this.pack();
}
public JPanel getPanel() {
if (panel == null) {
panel = new JPanel();
panel.setBackground(Color.RED);
panel.setBounds(0, 0, 200, 200);
panel.setPreferredSize(new Dimension(200, 200));
}
return panel;
}
}
And this is the startup class:
public class StartUp {
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
} catch (Exception e) {
e.printStackTrace();
}
Frame app = new Frame();
app.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
app.pack();
app.setVisible(true);
}
}
When run under Java 6 you get the "Window Resized: Frame" message.
The same run under Java 7, no messages at all.
Below are 2 links to Pictures:
your code (before balast removed, changed to standard) work for me correctly
ComponentListener
firing an event from every pixels
this is basic property of componentResized()
, otherwise required SwingTimer.restart()
untill resize ended)
balast removed, changed to standard
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
public class MyFrame {
private JFrame frame = new JFrame();
private JPanel panel;
public MyFrame() {
frame.add(getPanel());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
frame.addComponentListener(new ComponentAdapter() {
@Override
public void componentResized(ComponentEvent e) {
System.out.println("Window Resized: Frame");
}
});
}
public JPanel getPanel() {
if (panel == null) {
panel = new JPanel() {
@Override
public Dimension getPreferredSize() {
return new Dimension(300, 200);
}
};
panel.setBackground(Color.RED);
}
return panel;
}
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
} catch (Exception e) {
e.printStackTrace();
}
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
MyFrame app = new MyFrame();
}
});
}
}