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An action item with the given index was chosen from the pop-up list. The automatic completion provided by GtkEntryCompletion was activated. This allows you to change the default prefix shown by the widget. The user chose a match from the list of items, which is defined by the given GtkTreeModel.

Figure 8-3 A TreeView control used to view a tree This code is about half the length of Listing 8-1, when you drew the tree yourself It is also more functional, because it allows you to fold away parts of the tree in which you re not interested This greatly improves the size of tree that can be manageably displayed In this example, you use the dock style to control how the control looks You do this by setting the control s Dock property with a member of the DockStyle enumeration Docking means that the control will take up as much space as available in the form that contains it on the left side if you use DockStyleLeft, on the right side if you use DockStyleRight, at the top if you use DockStyleTop, on the bottom if you use DockStyle.

The expander was toggled. This signal is emitted both when the widget is expanded and when it is retracted.

Entry[] entries = item.attributeSets; for (int n = 0; n < entries.length; n++) { if (entries[n] instanceof Location) { return (Location) entries[n]; } } return null; } } } // TestPrinterDistance A number of services will need to be running. At least one distance service will be needed, implementing the interface Distance: package common; import net.jini.lookup.entry.Location; /** * Distance.java */ public interface Distance extends java.io.Serializable { int getDistance(Location loc1, Location loc2); } // Distance The following is an example implementation of a distance service: package complex; import net.jini.lookup.entry.Location; /** * DistanceImpl.java */ public class DistanceImpl implements common.Distance { public DistanceImpl() { } /** * A very naive distance metric */ public int getDistance(Location loc1, Location loc2) { int room1, room2; try { room1 = Integer.parseInt(loc1.room); room2 = Integer.parseInt(loc2.room); } catch(Exception e) { return -1; } int value = room1 - room2;

The user wants to save a file with a name of a file that already exists. You need to return GTK_FILE_CHOOSER_CONFIRMATION_ ACCEPT_FILENAME to accept the user s choice, GTK_FILE_CHOOSER_ CONFIRMATION_CONFIRM to present the default dialog to confirm the overwriting, or GTK_FILE_CHOOSER_CONFIRMATION_SELECT_AGAIN to make the user select a different name. The current folder shown by the GtkFileChooser was changed. Examples of this can be when the user changes the folder, a bookmark is clicked, or a function call explicitly changes the folder.

Bottom, and on the whole form if you use DockStyleFill This is great when you have just a few controls, because it creates a nice dynamic effect because the controls are resized when the user resizes the form; however, it does not work well with a lot of controls because it is difficult to get lots of controls to fit together nicely using this technique For example, if you have two controls that are docked to the left, it s confusing which one is supposed to be the leftmost one and how much of the left side they both take up A better solution with a lot of controls is to explicitly control their layout using the Top and Left properties You can create a dynamic effect by using the Anchor property to anchor the control to the edge of the containing form.

return (value > 0 value : -value); } } // DistanceImpl Earlier in this chapter I provided the code for PrinterImpl. A simple program to start up a distance service and two printers is as follows: package complex; import printer.Printer30; import printer.Printer20; import complex.DistanceImpl; import net.jini.lookup.JoinManager; import net.jini.core.lookup.ServiceID; import net.jini.lookup.ServiceIDListener; import net.jini.lease.LeaseRenewalManager; import net.jini.discovery.LookupDiscovery; import net.jini.lookup.entry.Location; import net.jini.core.entry.Entry; import net.jini.discovery.LookupDiscoveryManager; import java.rmi.RMISecurityManager; /** * PrinterServerLocation.java */ public class PrinterServerLocation implements ServiceIDListener { public static void main(String argv[]) { new PrinterServerLocation(); // run forever Object keepAlive = new Object(); synchronized(keepAlive) { try { keepAlive.wait(); } catch(InterruptedException e) { // do nothing } } } public PrinterServerLocation() { System.setSecurityManager(new RMISecurityManager()); JoinManager joinMgr = null; try { LookupDiscoveryManager mgr = new LookupDiscoveryManager(LookupDiscovery.ALL_GROUPS, null /* unicast locators */, null /* DiscoveryListener */); // distance service joinMgr = new JoinManager(new DistanceImpl(), null,

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