font barcode 128 vb.net Demonstrating Modality Types in Java

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Listing 4-6. Demonstrating Modality Types
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import javax.swing.*; import java.awt.*; import java.awt.event.*; public class DualModal { public static void main(String args[]) { Runnable runner = new Runnable() { public void run() { JFrame frame1 = new JFrame("Left"); JFrame frame2 = new JFrame("Right"); frame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame2.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JButton button1 = new JButton("Left"); JButton button2 = new JButton("Right"); frame1.add(button1, BorderLayout.CENTER); frame2.add(button2, BorderLayout.CENTER); ActionListener listener = new ActionListener() { public void actionPerformed(ActionEvent e) { JButton source = (JButton)e.getSource();
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CHAPTER 4 AWT AND SWING UPDATES
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String text = getNewText(source); if (!JOptionPane.UNINITIALIZED_VALUE.equals(text) && text.trim().length() > 0) { source.setText(text); } } }; button1.addActionListener(listener); button2.addActionListener(listener); frame1.setBounds(100, 100, 200, 200); frame1.setVisible(true); frame2.setBounds(400, 100, 200, 200); frame2.setVisible(true); } }; EventQueue.invokeLater(runner); } private static String getNewText(Component parent) { JOptionPane pane = new JOptionPane( "New label", JOptionPane.QUESTION_MESSAGE ); pane.setWantsInput(true); JDialog dialog = pane.createDialog(parent, "Enter Text"); // Uncomment line and comment out next to see application modal // dialog.setModalityType(Dialog.ModalityType.APPLICATION_MODAL); dialog.setModalityType(Dialog.ModalityType.DOCUMENT_MODAL); dialog.setVisible(true); return (String)pane.getInputValue(); } }
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Notice how you can interact with the top-level dialog over each frame, but not the frame under either of them when the dialog is shown. Figure 4-11 shows the initial pair of frames. Figure 4-12 shows the two frames with their respective option panes showing. Changing the setModalityType() line to use APPLICATION_MODAL and rerunning the program won t allow you to interact with both option frames simultaneously. You need to finish using one before you can bring up the other.
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Figure 4-11. Initial frames without either input pop-up window
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Figure 4-12. Frames with both input pop-up windows showing
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Note Changing the modality of a window that s already showing has no effect. You must hide the dialog
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box and make it visible again for the new modality setting to take effect.
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One pre-Mustang feature is worth mentioning here: any AWT Window or subclass can request that it is always on top, via the setAlwaysOnTop() method of Window. This is not the same as modal and does not prevent other windows from getting input focus.
GIF Writer
Lempel-Ziv-Welch (LZW) is a lossless data compression algorithm implementation. Part of the GIF image format, it was originally patented by Sperry Corporation, and later taken over by Unisys. While displaying GIF formats has always been supported by the Java platform, the image I/O libraries only supported reading the format. Due to the
CHAPTER 4 AWT AND SWING UPDATES
aforementioned patent, support for writing GIF images was never part of the standard Java libraries. Now that the US patent and its counterparts around the globe have expired, support for writing GIF images is available, free of any legal threats or royalty requirements. Listing 4-7 demonstrates the newly added capabilities.
Listing 4-7. Writing GIF-Formatted Images
import import import import javax.imageio.*; java.io.*; java.awt.image.*; java.util.*;
public class ToGif { public static void main(String args[]) throws IOException { System.out.println("Supported Writer Formats:"); System.out.println(Arrays.toString(ImageIO.getWriterFormatNames())); if (args.length == 0) { System.err.println("Missing input filename"); System.exit(-1); } String name = args[0]; File inputFile = new File(name); BufferedImage input = ImageIO.read(inputFile); File outputFile = new File(name+".gif"); ImageIO.write(input, "GIF", outputFile); } }
First, the program prints out a list of all available format names for writing images ([BMP, jpeg, bmp, wbmp, GIF, gif, png, JPG, PNG, jpg, WBMP, JPEG] for the Java 6 standard platform). Then, it checks for an image file name specified on the command line, reads it, and writes the converted image to GIF. The original file is not overwritten, even if it was originally a GIF image. Instead, .gif is simply appended to the entire original file name. For example, a file named HelloWorld.png would become HelloWorld.png.gif.
CHAPTER 4 AWT AND SWING UPDATES
Text Antialiasing
I am not really into the specifics of describing antialiasing, so this description may not be the best from a technical standpoint; however, I nonetheless want to discuss this topic, since Java 6 adds some additional antialiasing support that benefits text. Antialiasing is the smoothing-out of lines drawn into a graphics context (typically the screen, though also to a printer). As you know, the screen is just a bunch of square pixels. If you connect these pixels on a diagonal, the user will see what are known as the jaggies, as shown in Figure 4-13. When enabled, antialiasing smoothes out these jagged edges by drawing a lighter shade of color around the pixel. As shown in Figure 4-14, your eyes don t perceive the jagged edges to be as bad with the added color around pixels. The difference is actually quite amazing when antialiasing is displayed at a proper pixel size, as opposed to the large size shown in Figures 4-13 and 4-14.
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