JFrame drag problem

Hi
I have simple app that has a number of JFrames popping up etc, when i drag a popped up JFrame over my main JFrame it flickers and creates a trail until the dragging is stopped.
Anyone know how to stop this ?!
thx
joj

Add a [Component Listener|http://java.sun.com/docs/books/tutorial/uiswing/events/componentlistener.html] to the JFrame and resize your JInternalFrame according to the JFrame size.

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Hi,
We face the following problem. Attached herewith are code sample and simulation for the problem. Would be great if someone could help us.
Problem: Objects created in AIR application experience mouse drag problem.
To simulate the problem please execute the sample application, a grey box (object) appears on the screen. Hold down left and right mouse buttons and drag the object and release both the mouse buttons. Object sticks to mouse pointer and moves along with mouse pointer to wherever it is dragged.
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Fortunately It's true on windows, mac and linux SUN JREs.
On windows and mac, you get the same effect if you decide to do it programatically with for example :
package testframe;
import javax.swing.JFrame;
public class Main {
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}But this code doesn't work as expected on linux distros. I tried on kde, gnome and xfce, and I always get the same problem : the JRE (probably because of calls to window manager) refuses to place the window a little bit outside the screen boundaries. So in my example, jf.setLocation(-300,50) have the same effect as jf.setLocation(0,50).
Of course, when the windows appear at the (0,50) coordinates, it's always possible on linux to move it manually to a negative x-coordinate place.
setBounds method will lead to the same trouble...
Of course this piece of code is only here to show exactly what's wrong on linux sun jre's. In my "real code", I need to deal with undecorated Jframes, so I have to manage myself the mousepressed and mousedragged events on my custom titlebar, and I would really want the linux version of my application behave the same as windows and mac versions ...
The weird thing is that if I try to do that with JWindows in place of JFrames, it work's fine on Linux as well. But the problem is not here : in my case I need JFrames...
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Greetings:
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Greetings:
Thanks a lot for your kind answer:
After reading your reply, I've done some studies directly in the API in how does the L&F's are managed. Of what I've understood (please correct me if I'm wrong), the things are as follow:
i) System and Motif Look and Feel's does NOT support decorations, so that's why you should let the JVM do the decoration work (that is, use myFrame.setUndecorated(false); ).
In this case, it does not matter if you use JFrame.setDefaultLookAndFeelDecorated(true); before the creation of the frame: it won't show decorations if you don't use the command mentioned.
ii) Metal (Java) Look and Feel DOES support decorations; that's why, if you use JFrame.setDefaultLookAndFeelDecorated(true); before the creation of the frame, you'll see it's own decorations. In this case, you should use myFrame.setUndecorated(true); so the L&F does all the decorating work, avoiding the weird sitiuation of showing double decorating settings (L&F's and native system's).
iii) So, the real problem here would be if you want to have, as a user choice, that the System/Motif L&F's will be available together with the Java's (Metal). I've made the next variation to my code, so that this will be possible:
class LookAndFeel_ActionListener implements ActionListener {
private ButtonGroup eventButtonGroup;
private MainWin eventFrame;
public LookAndFeel_ActionListener (ButtonGroup buttonGroup, MainWin eventFrame) {
this.eventButtonGroup = buttonGroup;
this.eventFrame = eventFrame;
public void actionPerformed(ActionEvent event) {
String command = eventButtonGroup.getSelection().getActionCommand();
GraphicsDevice scrnDevice = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice();
eventFrame.dispose();
if (command.equals("System")) {
try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
eventFrame.setUndecorated(false); // make sure the native system controls decorations as this L&F doesnt's manage one's.
catch (Exception e) { }
else { if (command.equals("Java")) {
try { UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName()); }
catch (Exception e) { }
eventFrame.setUndecorated(true); // make sure the L&F controls decorations as it actually has one's.
else { if (command.equals("Motif")) {
try { UIManager.setLookAndFeel(new MotifLookAndFeel()); }
catch (Exception e) { }
eventFrame.setUndecorated(false); // make sure the native system controls decorations as this L&F doesnt's manage one's.
else { }
SwingUtilities.updateComponentTreeUI(eventFrame);
if (eventFrame.FullScrnOn){ try {scrnDevice.setFullScreenWindow(eventFrame); }
finally { }
} else { }
eventFrame.setVisible(true);
}iv) The issue here is that, as I needed to use myFrame.dispose() (the JVM says that it is not possible to use setUndecorated(false); in a displayable frame), I recieve and error:
Exception in thread "AWT-EventQueue-0" java.lang.IllegalStateException: Buffers have not been created
at sun.awt.windows.WComponentPeer.getBackBuffer(WComponentPeer.java:846)
at java.awt.Component$FlipBufferStrategy.getBackBuffer(Component.java:3815)
at java.awt.Component$FlipBufferStrategy.updateInternalBuffers(Component.java:3800)
at java.awt.Component$FlipBufferStrategy.revalidate(Component.java:3915)
at java.awt.Component$FlipBufferStrategy.revalidate(Component.java:3897)
at java.awt.Component$FlipBufferStrategy.getDrawGraphics(Component.java:3889)
at javax.swing.BufferStrategyPaintManager.prepare(BufferStrategyPaintManager.java:508)
at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:264)
at javax.swing.RepaintManager.paint(RepaintManager.java:1220)
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and, yet, the Metal (Java's) L&F keeps without decorations. Is it there a way to solve this without having to create a new instance of the frame and use JFrame.setDefaultLookAndFeelDecorated(true); before the creation of such new instance of the frame for the Metal's (Java) L&F?
Thanks again for al lthe help: this was, definetelly, something not obvious to figure out (or to find a hint on the net).
Regards,

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JFrame drag problem

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