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POGridBagLayout, disappearing JList
 

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    <p>I wrote simple java application. One window (JFrame ramka) containing 3 elements: JButton, JComboBox and container (which contain JList). I would like to rearrange positions of those elements, and it cause problems. I would like to use GridBagLayout, but when I do this, my container disappears(or it is 1px large -.-), also setSize works fine for JComboBox. And when I do not use any layout, container with JList is shown, but resizing JComboBox doesn't work, and everything is overlaping itself... generaly it looks like.. it doesn't look at all.</p> <p>here come my question: how, and what layout use to reorganise positions of my compnents and JFrame? i use NetBeans 7.2</p> <pre><code>package layouttest; import java.awt.*; import javax.swing.*; import javax.swing.JList; import java.util.ArrayList; import java.awt.*; import java.awt.GridBagLayout; import java.awt.event.*; import javax.swing.*; public class Layouttest { public static void main(String[] args) { JFrame ramka = new JFrame(); //ramka.setLayout(new GridLayout(4, 3)); //ramka.setLayout(new GridBagLayout()); String [] test = {"cos", "cos2", "cos3", "cos4", "cos5", "cos6", "cos7", "cos8", "cos9","cos10", "cos11", "cos12"}; ArrayList&lt;String&gt; myList = new ArrayList&lt;String&gt;(); myList.add("cos"); myList.add("cos2"); myList.add("cos3"); myList.add("cos4"); myList.add("cos5"); myList.add("cos6"); myList.add("cos7"); myList.add("cos8"); myList.add("cos9"); myList.add("cos10"); GridBagConstraints ogranicznik = new GridBagConstraints(); ogranicznik.insets = new Insets(5, 10, 5, 5); ogranicznik.gridx = 0; ogranicznik.gridy = 0; Container c = new Container(); ramka.setSize(500, 500); c.setSize(100,100); JList lista = new JList(myList.toArray()); JScrollPane sp = new JScrollPane(lista); JTextField txt = new JTextField("cos"); c.add(sp); sp.setSize(100,100); lista.setSize(100, 100); ramka.add(c); ramka.add(txt); String[] dropBoxList = {"uno", "due", "tre"}; final JComboBox listaRozwijalna = new JComboBox(dropBoxList); listaRozwijalna.setPrototypeDisplayValue("XXXXXXXXXXXXXXXXXXXX"); listaRozwijalna.revalidate(); listaRozwijalna.repaint(); ramka.add(listaRozwijalna); c.revalidate(); c.repaint(); ramka.revalidate(); ramka.setVisible(true); ramka.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // TODO code application logic here } } </code></pre> <p>@EDIT i discovered that java has problem with showing container while using layout models...</p>
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    1. COWhen you add the component in scrollpane, you will also need to set the view port. you can use sp.setViewPortView(Component) method and try.
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    2. COWhy put a JList in a scrollpane?
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    3. COIn my understanding JList by default don't have scrollPane with it. So, to augment the JList and allow scrolling we need to add JList to ScrollPane.
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