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Trouble adding a JPanel to a JPanel

 
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Trouble adding a JPanel to a JPanel, the panel doesnt show up
Noldona
3 Aug, 2008 - 03:44 PM
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I am trying to add a JPanel (lets call it cleric) with a TitledBorder and several control to a JPanel (call this one page4). If I add the controls to page4 they show up. However, if I add the controls to cleric then add cleric to page4 it nothing shows up. I don't understand why is this isn't working.

CODE

        SpringLayout layout = new SpringLayout();
        JPanel page4 = new JPanel(layout);
        JPanel cleric = new JPanel(layout);

                // code here was omitted due to irrelevance with problem

        // Page 4 Items
        
        TitledBorder clericBorder = BorderFactory.createTitledBorder(BorderFactory.createLineBorder(Color.BLACK), "Clerics");
        cleric.setBorder(clericBorder);
        
        txtDomain1 = new JTextField();
        txtDomain1.setPreferredSize(new Dimension(80, 20));
        cleric.add(txtDomain1);
        layout.putConstraint(SpringLayout.NORTH, txtDomain1, 5, SpringLayout.NORTH, cleric);
        layout.putConstraint(SpringLayout.WEST, txtDomain1, 5, SpringLayout.WEST, cleric);
        
        lblDomain1 = new JLabel(smallText("Domain Name"));
        cleric.add(lblDomain1);
        layout.putConstraint(SpringLayout.NORTH, lblDomain1, -3, SpringLayout.SOUTH, txtDomain1);
        layout.putConstraint(SpringLayout.WEST, lblDomain1, 0, SpringLayout.WEST, txtDomain1);
        
        txtGrantedPower1 = new JTextField();
        txtGrantedPower1.setPreferredSize(new Dimension(80,20));
        cleric.add(txtGrantedPower1);
        layout.putConstraint(SpringLayout.NORTH, txtGrantedPower1, 5, SpringLayout.NORTH, cleric);
        layout.putConstraint(SpringLayout.WEST, txtGrantedPower1, 5, SpringLayout.EAST, txtDomain1);
        
        lblGrantedPower1 = new JLabel(smallText("Granted Power"));
        cleric.add(lblGrantedPower1);
        layout.putConstraint(SpringLayout.NORTH, lblGrantedPower1, -3, SpringLayout.SOUTH, txtGrantedPower1);
        layout.putConstraint(SpringLayout.WEST, lblGrantedPower1, 0, SpringLayout.WEST, txtGrantedPower1);
        
        txtDomain2 = new JTextField();
        txtDomain2.setPreferredSize(new Dimension(80, 20));
        cleric.add(txtDomain2);
        layout.putConstraint(SpringLayout.NORTH, txtDomain2, 5, SpringLayout.SOUTH, lblDomain1);
        layout.putConstraint(SpringLayout.WEST, txtDomain2, 5, SpringLayout.WEST, cleric);
        
        lblDomain2 = new JLabel(smallText("Domain Name"));
        cleric.add(lblDomain2);
        layout.putConstraint(SpringLayout.NORTH, lblDomain2, -3, SpringLayout.SOUTH, txtDomain2);
        layout.putConstraint(SpringLayout.WEST, lblDomain2, 0, SpringLayout.WEST, txtDomain2);
        
        txtGrantedPower2 = new JTextField();
        txtGrantedPower2.setPreferredSize(new Dimension(80,20));
        cleric.add(txtGrantedPower2);
        layout.putConstraint(SpringLayout.NORTH, txtGrantedPower2, 5, SpringLayout.SOUTH, lblDomain1);
        layout.putConstraint(SpringLayout.WEST, txtGrantedPower2, 5, SpringLayout.EAST, txtDomain2);
        
        lblGrantedPower2 = new JLabel(smallText("Granted Power"));
        cleric.add(lblGrantedPower2);
        layout.putConstraint(SpringLayout.NORTH, lblGrantedPower2, -3, SpringLayout.SOUTH, txtGrantedPower2);
        layout.putConstraint(SpringLayout.WEST, lblGrantedPower2, 0, SpringLayout.WEST, txtGrantedPower2);
        
        cleric.setPreferredSize(new Dimension(300, 300));
        cleric.setBackground(Color.BLUE);        // added to see if the panel shows up or not
        page4.add(cleric);
        layout.putConstraint(SpringLayout.NORTH, cleric, 5, SpringLayout.NORTH, page4);
        layout.putConstraint(SpringLayout.WEST, cleric, 5, SpringLayout.WEST, page4);
        
        // Tabbed Pane
        tabbedPane.addTab("Page 1", null, page1);
        tabbedPane.addTab("Page 2", null, page2);
        tabbedPane.addTab("Page 3", null, page3);
        tabbedPane.addTab("Page 4", null, page4);
        this.add(tabbedPane, BorderLayout.CENTER);
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pbl
RE: Trouble Adding A JPanel To A JPanel
3 Aug, 2008 - 04:53 PM
Post #2

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Noldona,

I am writing Java code for 6 years... never heard of SpringLayout
Went to the API and find it fascinating... this SpingLayout thing would have solved thousand of problems I had

Now, if you don't post all your code we cannot cut & paste it to try it and found where your problem is
Anyhow despite that, I see a lot of my old applications where "your" SpringLayout will replace old GridLayout with fake/empty JLabel

Thanks a lot

Paul-Benoit Larochelle
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Noldona
RE: Trouble Adding A JPanel To A JPanel
3 Aug, 2008 - 05:45 PM
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Well, the problem with posting all of my code is that the program this is from is a LARGE program. It uses the Java Plugin Framework and actually consists of a couple different plugins. The rest of the code works fine. It is when I got to this part that I had the problem. The class that code came from extends JPanel. That code is in a function that is called from the constructor. The instance of the class is set at the contentPane of an JInternalFrame. That JInternalFrame is added to a JDesktopPane which is set at the ViewportView of a JScrollPane. That JScrollPane is set to one side of a JSplitPane which is added to the contentPane of a JFrame. In the GUI creation function for the class that extends JPanel, there is a JTabbedPane which is added to it. The JTabbedPage has 4 tabs, the first 3 tabs of which is the omitted code and all work fine. Tab 4 is the one I am having problems with and the code for that tab is posted. When I run my code, tab 4 shows up but nothing shows on the tab.

As for the SpringLayout, I am new to Java. I have been working in it for about 2 months now. I have plenty of programming experience in other languages though. Most of my experience is with VB and C++ with the Visual Studio IDE. I always like the way that worked with designing the GUIs. So when I started working with Java and read about these layout managers I was annoyed. So I searched for better options and found the SpringLayout which I really like. It makes laying things out a lot easier.
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