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Java Forum / GUI / September 2006how to force a window to stay in background
hi all, I want a message window, created as: static void showWarning(JFrame frame, String s) { if (frame == null || s == null) return; Window window = SwingUtilities.getWindowAncestor(frame); JOptionPane.showMessageDialog(window, s); } it have a message the user must acknowledge: it block alla the button og main window until I press OK, as desired, but if I click on the main window, the main window is brought to foreground and hides the dialog. How can I have a dialog always in foreground, until I press OK? thanks giammy sorry for the original subject: i want a dialog window to stay in FOREGROUND ... > hi all, > [quoted text clipped - 15 lines] > thanks > giammy > sorry for the original subject: i want a dialog window to > stay in FOREGROUND ... Lookup "Modal dialog". - Oliver giangiammy schrieb: > sorry for the original subject: i want a dialog window to > stay in FOREGROUND ... See java.awt.Window#setAlwaysOnTop. Haven't used it so far, so give it a try. Bye Michael Michael Rauscher schrieb: > giangiammy schrieb: >> sorry for the original subject: i want a dialog window to >> stay in FOREGROUND ... > > See java.awt.Window#setAlwaysOnTop. Haven't used it so far, so give it a > try. Forget it. I should have looked a bit deeper at your posting. Of course, you want a modal dialog as Oliver stated already. Bye Michael > hi all, > [quoted text clipped - 12 lines] > to foreground and hides the dialog. > How can I have a dialog always in foreground, until I press OK? If "frame" is the main window, then use JOptionPane.showMessageDialog(frame, s); > If "frame" is the main window, then use > JOptionPane.showMessageDialog(frame, s); Yes, I tested, putting the main frame (calling it with this) and it works correctly, but if I use it from an applet, the "this" reppresent aan applet, not a frame: I need to get the frame containig the applet - correct? Now I search the function to get this info giammy > > If "frame" is the main window, then use > > JOptionPane.showMessageDialog(frame, s); > > Yes, I tested, putting the main frame (calling it with this) > and it works correctly, but if I use it from an applet, > the "this" reppresent aan applet, not a frame: You are in luck. Every applet has an associated frame. Try this from within an applet. <http://java.sun.com/j2se/1.5.0/docs/api/java/awt/Frame.html#getFrames()> Note that is is a static method, you do not need an instance of frame to call it, and note particularly the description (which mentions applets). Andrew T. > > > If "frame" is the main window, then use > > > JOptionPane.showMessageDialog(frame, s); [quoted text clipped - 4 lines] > > You are in luck. Every applet has an associated frame. Crap! I wish I had read Larry's word more carefully. A JOptionPane can accept a 'null' frame. You do not even need to attach it to the 'default' frame and it should act as you specified. Andrew t. > You do not even need to attach it to the 'default' > frame and it should act as you specified. OK I got it: I need to pass the main frame or the main applet to get the behaviour I want. If I pass the null, the pop up is shown, but it can be put in background. giammy > > You do not even need to attach it to the 'default' > > frame and it should act as you specified. ... > OK I got it: I need to pass the main frame or the > main applet to get the behaviour I want. Ummm.. no. The two ways on offer are.. Frame f = Frame.getFrames()[0]; JOptionPane.showMessageDialog(f, theMessage); ...or.. JOptionPane.showMessageDialog(null, theMessage); (Note that neither accepts an applet as an argument.) > If I pass the null, the pop up is shown, > but it can be put in background. Again, no. *All* instances of the JOptionPane (JOP) block input to the original application (or applet) until dismissed. The end user can 'alt tab' (or whatever) to other applications or windows that are open, but if they return to the web page that opened the JOP, the JOP will appear 'above the web page' and block input to the applet until dismissed. Andrew T. >>>You do not even need to attach it to the 'default' >>>frame and it should act as you specified. [quoted text clipped - 10 lines] > Frame f = Frame.getFrames()[0]; > JOptionPane.showMessageDialog(f, theMessage); Out of curiosity : What does SwingUtilities.getWindowAncestor(this) return when invoked from an Applet ? If that does return the frame that contains the Applet, it would probably be a better idea to use it as the parent rather than Frame.getFrames()[0] (More deterministic if getFrames() returns more than one Frame) > ...or.. > > JOptionPane.showMessageDialog(null, theMessage); > > (Note that neither accepts an applet as an argument.) Hmm ? Isn't the first argument of the showMessageDialog method a java.awt.Component ? In which case it should allow an Applet to be passed as the parentComponent. BK .... > > The two ways on offer are.. > > > > Frame f = Frame.getFrames()[0]; > > JOptionPane.showMessageDialog(f, theMessage); ... > > JOptionPane.showMessageDialog(null, theMessage); > > > > (Note that neither accepts an applet as an argument.) ... > Hmm ? Isn't the first argument of the showMessageDialog method a > java.awt.Component ? LOL! while typing that entire post, I was thinking.. 'SOK*, Babu might notice this post and jump in with accurate details. * 'SOK translates to 'It is OK'. ...and on the bits I trimmed (shrugs vaguely) - dunno'. Shall we leave it as 'an exercise for the OP'? ;-) Andrew T. > .... > [quoted text clipped - 23 lines] > > Shall we leave it as 'an exercise for the OP'? ;-) Haha.. well I hadn't noticed it till I wrote the initial question - I was really wondering if the SwingUtilities method wouldn't provide you with the actual Frame that parented the Applet, because getFrames()[0] seemed so arbitrary. Anyway good to hear that I'm keeping someone on their toes ;-) Never realized I had this reputation of "policing" the newsgroup !! BK > Out of curiosity : What does SwingUtilities.getWindowAncestor(this) > return when invoked from an Applet ? If that does return the frame > that contains the Applet, it would probably be a better idea to > use it as the parent rather than Frame.getFrames()[0] (More > deterministic if getFrames() returns more than one Frame) I tested SwingUtilities.getWindowAncestor(this), but it did not get me the correct behavious of the pop up neither in the standalone application nor in the applet. > > ...or.. > > [quoted text clipped - 5 lines] > java.awt.Component ? In which case it should allow an Applet to > be passed as the parentComponent. Yes: I have done in this way: I pass the applet as parent bye giammy Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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