AppletTalk.com Java discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Problem with glasspane on JScrollPane          AppletTalk.com Forum Index -> Java GUI Toolkits View previous topic :: View next topic   Author Message Anthony Mak Guest Posted: Thu Sep 29, 2005 5:56 am    Post subject: Problem with glasspane on JScrollPane I have a JApplet inside a JScrollPane and I am drawing on the glasspane which I get from the JApplet, glasspane Quote: V JApplet Quote: V JScrollPane The problem is, sometimes my scrollbars are not visible, and sometimes when I scroll on either the vertical or horizontal scrollbar, the other one is covered by the glasspane. And sometimes the glasspane covers part of the toolbar at the top. I don't understand why the glasspane can cover the scrollpane or the toolbar because my glasspane is gotten from the japplet which is INSIDE my scrollpane which is inside my JFrame. Please help. Merci. Arigatou. Anthony Mak Back to top Roedy Green Guest Posted: Thu Sep 29, 2005 6:37 am    Post subject: Re: Problem with glasspane on JScrollPane On 28 Sep 2005 22:56:08 -0700, "Anthony Mak" <anthony.mak (AT) iname (DOT) com> wrote or quoted : Quote: The problem is, sometimes my scrollbars are not visible, and sometimes when I scroll on either the vertical or horizontal scrollbar, the other one is covered by the glasspane. And sometimes the glasspane covers part of the toolbar at the top. I don't understand why the glasspane can cover the scrollpane or the toolbar because my glasspane is gotten from the japplet which is INSIDE my scrollpane which is inside my JFrame. I have no glasspane experience, but perhaps you want to get the glasspane of the JScrollPane instead. Your fiddlings perhaps require some repainting elsewhere? Are you tying up the Swing thread? Are you poking Swing components with the wrong thread? Without code it is hard to tell what the matter could be. -- Canadian Mind Products, Roedy Green. http://mindprod.com Again taking new Java programming contracts. Back to top Anthony Mak Guest Posted: Fri Sep 30, 2005 4:52 am    Post subject: Re: Problem with glasspane on JScrollPane Thanks for the quick reply, Roedy. Roedy Green wrote: Quote: I have no glasspane experience, but perhaps you want to get the glasspane of the JScrollPane instead. The problem is JScrollPane doesn't have a getglasspane() method. So I am creating a dummy JApplet (which has getglasspane() ), and putting it inside my JScrollPane. Quote: Your fiddlings perhaps require some repainting elsewhere? I presume the code handling the JScrollPane should handle the repainting of any componenets inside itself. Quote: Are you tying up the Swing thread? What do you mean tying the thread? Quote: Are you poking Swing components with the wrong thread? My application doesn't not use thread. Quote: Without code it is hard to tell what the matter could be. CODE: This shows how I put a graph object inside an japplet inside a jscrollpane inside a jframe. And I get a glasspane from the japplet for painting purpose. dummy_container = new JApplet(); //Need to put graph into a dummy applet to get a glasspane. So that can draw custom tooltip onto this glasspane. dummy_container.getContentPane().add(graph); //Put jgraph inside an applet in order to get a glasspane to draw custom tooltip glasspane = (JPanel) dummy_container.getGlassPane(); glasspane.setVisible(true); glasspane.setLayout(null); scrollpane = new JScrollPane(new JPanel().add(dummy_container)); scrollpane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED); scrollpane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED); main_pane.add(scrollpane, BorderLayout.CENTER); I know using a dummy japplet in order to get a glasspane is not very clean. :) Anthony Quote: -- Canadian Mind Products, Roedy Green. http://mindprod.com Again taking new Java programming contracts. Back to top Roedy Green Guest Posted: Fri Sep 30, 2005 6:20 am    Post subject: Re: Problem with glasspane on JScrollPane On 29 Sep 2005 21:52:20 -0700, "Anthony Mak" <anthony.mak (AT) iname (DOT) com> wrote or quoted : Quote: Are you tying up the Swing thread? What do you mean tying the thread? see http://mindprod.com/jgloss/thread.html http://mindprod.com/jgloss/threadsafe.html http://mindprod.com/jgloss/swing.html Basically there two errors can make that will tie up the Swing thread so it can't attend to painting, events, keystrokes etc. 1. sleep 2. do some lengthy task in an event handler. Instead spin it off as its own Thread, being careful to poke any Swing components via invokeLater on your new thread. see SwingWorker in the Thread entry to do that neatly. -- Canadian Mind Products, Roedy Green. http://mindprod.com Again taking new Java programming contracts. 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