Creating a Swing Dashboard Widget - Part 9 (Examples)

So the widget code is beta complete. With some tidying and refactoring it's time to create some simple examples.

Clock Widget Launch
Weather Widget Launch
(Systems other than OSX* require Java 6 update 10)



With the widget specific code pushed into a base class, these two examples just needed code to gather some information and paint themselves: About 100 lines each.

ClockWidget Code:<br />public class ClockWidget extends PlainWidget {<br /> private static DateFormat dateFormat12 = new SimpleDateFormat("kk:mm");<br /> private static DateFormat dateFormat24 = new SimpleDateFormat("hh:mm");<br /> private static DateFormat df = dateFormat12;<br /><br /> private ClockWidget() {<br /> super();<br /> }<br /><br /> public Dimension getPreferredSize() {<br /> return new Dimension(220, 130);<br /> }<br /><br /> @Override<br /> protected JComponent createFront() {<br /> // --- Edited out boring front creation code ---<br /> panel.add(new ClockPanel());<br /> return panel;<br /> }<br /><br /> @Override<br /> protected JComponent createBack() {<br /> JComponent back = super.createBack();<br /> // --- Edited out boring back creation code ---<br /> return p;<br /> }<br /><br /> protected Point getCloseButtonLocation() {<br /> return new Point(0, 18);<br /> }<br /><br /> private class ClockPanel extends JComponent {<br /> private Font f = new Font("Arial", Font.BOLD, 65);<br /> private Font amf = new Font("Arial", Font.BOLD, 12);<br /> private static DateFormat dateFormat12am = new SimpleDateFormat("a");<br /> private Timer t;<br /><br /> private ClockPanel() {<br /> Timer t = new Timer(1000, new ActionListener() {<br /> public void actionPerformed(ActionEvent ae) {<br /> widgetComp.repaint();<br /> }<br /> });<br /> t.setRepeats(true);<br /> t.start();<br /> }<br /><br /> public void paint(Graphics g) {<br /> Graphics2D g2 = (Graphics2D)g.create();<br /> g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,<br /> RenderingHints.VALUE_ANTIALIAS_ON);<br /> g2.setFont(f);<br /> g2.setColor(Color.WHITE);<br /> g2.drawString(df.format(new Date()), 0, 51);<br /><br /> if (df == dateFormat12) {<br /> g2.setFont(amf);<br /> g2.drawString(dateFormat12am.format(new Date()),<br /> getWidth() - 18, 16);<br /> }<br /> }<br /> }<br /><br /> public static void main(String[] args) {<br /> new ClockWidget();<br /> }<br />}<br />These examples are just a taste of what's possible, rather than meant be really useful as working widgets - e.g. the weather widget is hard coded to San Francisco and could do with some better graphics.
They also illustrate one real advantage over traditional Javascript widgets in the use of the familiar libraries which are shipped as part of the base JDK. The weather reads an Yahoo XML feed and the clock uses a date formatter, both easily done in Java with no external libraries to download, license, ship, or understand.

Source code and summary next.

*I managed to fix the earlier OSX rendering problems by explicitly clearing the graphics before each frame. The widgets will now run on OSX with no additional downloads (Java 1.5).