import javax.swing.Timer; Add an attribute; Timer timer; boolean b; // for starting and stoping animation Add the following code to frame’s constructor. timer = new Timer(100, new ActionListener() { @Override public void actionPerformed(ActionEvent ae) { // change polygon data // … repaint(); } }); Override paint(Graphics g) and draw polygon from the data that was … Read more
When you do heavy task you should run them in another threads rather in the same as gui. If you run in Event Dispatch Thread then the gui is gonna freeze until finish. You can use SwingWorker here is an example i really like Swing Worker Example Example: class Worker extends SwingWorker<String, Object> { @Override … Read more
If you want your JTextField to be focused when your GUI shows up, you can use this: in = new JTextField(40); f.addWindowListener( new WindowAdapter() { public void windowOpened( WindowEvent e ){ in.requestFocus(); } }); Where f would be your JFrame and in is your JTextField.
Should I completely avoid the use of those methods? Yes for application code. The methods have been defined for a reason. So when should I use them? In which context? For what purposes? I don’t know, personally I think of it as an API design accident. Slightly forced by compound components having special ideas about … Read more
Check out how to work with models in How to Use Combo Boxes and How to Use Lists totorials. According to a selection in the first combo box – rebuild, filter or perhaps replace the model of the second combo box. You can use/extend DefaultComboBoxModel – a default model used by a JComboBox. For example … Read more
Return an instance of GrayableCheckboxCellRenderer in a TableCellEditor. Addendum: Aesthetically, you may want to condition the renderer’s and editor’s colors based on the defaults provided by the current Look & Feel, for example: Color hilite = UIManager.getColor(“Table.selectionBackground”);
Here is combo cell insets replicate demo: import java.awt.*; import java.awt.event.*; import java.util.EventObject; import javax.swing.*; import javax.swing.event.*; import javax.swing.table.*; public class ComboCellInsetsDemo { public JComponent makeUI() { String[] columnNames = {“Name”, “Check”, “Condition”}; Object[][] data = { {“bbb”, false, “=”}, {“aaa”, true, “<“} }; DefaultTableModel model = new DefaultTableModel(data, columnNames) { @Override public Class<?> getColumnClass(int … Read more
You’re mixing heavy weight (AWT) components with light weight (Swing) components, this is inadvisable as they don’t tend to play well together. JScrollPane contains a JViewPort onto which you can add a child component, AKA the view. (image from the JavaDocs) So the call jScrollPane.getViewport().setLayout(new FlowLayout(FlowLayout.CENTER)); is actually setting the JViewPort‘s layout manager, which really … Read more
You could remove the action listener before you add the new elements, and add it back once you’re done . Swing is single threaded so there is no need to worry about other threads needing to fire the listener. Your listener could probably also check if something is selected and take appropriate action if not. … Read more
UIManager.getLookAndFeelDefaults().put(“Panel.background”, Color.RED);