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The current color used for drawing operations on a source is cairo_set_source_rgb(). The color will be used until a new color is set. In addition to choosing a color, you can use cairo_ set_source_rgba(), which accepts a fifth alpha parameter. Each of the color parameters is a floating point number between 0.0 and 1.0. void cairo_set_source_rgb (cairo_t *cairo_context, double red, double green, double blue); After you have moved to a specific point and set the source color, you can fill the current path with cairo_fill(), which accepts only the context. Alternatively, you can fill a rectangular area with cairo_fill_extents(). This function will calculate an area with corners of (x1,y1) and (x2,y2), filling all of the area that is in between those points that is also contained by the current path. void cairo_fill_extents (cairo_t *cairo_context, double *x1, double *y1, double *x2, double *y2); Drawing operations such as curves can cause edges to become jagged. To fix this, Cairo provides antialiasing to drawings with cairo_set_antialias(). void cairo_set_antialias (cairo_t *cairo_context, cairo_antialias_t antialias); Antialiasing settings are provided by the cairo_antialias_t enumeration. A list of values provided by this enumeration follows: CAIRO_ANTIALIAS_DEFAULT: The default antialiasing algorithm will be used. CAIRO_ANTIALIAS_NONE: No antialiasing will occur; instead, an alpha mask will be used. CAIRO_ANTIALIAS_GRAY: Use only a single color for antialiasing. This color is not necessarily gray but is chosen based on the foreground and background colors. CAIRO_ANTIALIAS_SUBPIXEL: Use subpixel shading that is provided by LCD screens. This is simply a short introduction to Cairo drawing contexts that is provided to give you a taste of the topic. For further information on using Cairo, you should reference its API documentation, available at www.cairographics.org.

If java.rmi.server.codebase is an http reference, then the preceding class files must be accessible from that reference. For example, suppose the property is set to java.rmi.server.codebase=http://myWebHost/classes (where myWebHost is the name of the HTTP server s host) and this web server has its DocumentRoot set to /home/webdocs. In that case, these files must exist: /home/webdocs/classes/rmi/RemoteFileClassifier.class An Ant file to build and deploy server files where the service uses Jeri (or any protocol that generates its own proxies at runtime) is as follows: <!-Project name must be the same as the file name, which must be the same as the main.class. Builds jar files with the same name. --> <project name="rmi.FileClassifierServerRMI"> <!-- Inherits properties from ../build.xml: jini.home jini.jars src dist build httpd.classes --> <!-- Files for this project --> <!-- Source files for the server --> <property name="src.files" value=" common/MIMEType.java, common/FileClassifier.java, rmi/RemoteFileClassifier.java, rmi/FileClassifierImpl.java, rmi/FileClassifierServerRMI.java "/> <!-- Class files to run the server --> <property name="class.files" value=" common/MIMEType.class, common/FileClassifier.class, rmi/RemoteFileClassifier.class, rmi/FileClassifierImpl.class, rmi/FileClassifierServerRMI.class "/>

Locking is an important aspect of concurrency. Any resource that will be written to and shared between threads should be locked. A resource is often a variable, but it could also be a file or even the console, as shown in this example. You should not think of locks as a magical solution to concurrency. Although they work, they also can also create problems of their own since they can create a deadlock, where different threads lock resources that each other needs and neither can advance. The simplest solution to concurrency is often to simply avoid sharing a resource that can be written to between threads.

In GTK+ 2.10, a new API was introduced that allows you to keep track of recently opened files across applications. In this section, we are going to implement this functionality in the simple text editing application. This application with a recent file chooser is shown in Figure 12-4. Later, in this chapter s exercise, you are going to add recent file support to your text editor.

After setting the classpath, run a dumb ticking clock: java \ -Djava.rmi.server.codebase= \ http://jan.netcomp.monash.edu.au/classes/clock.clock-dl.jar \ -Djava.security.policy=JINI_HOME/installverify/support/jsk-all.policy \ clock.clock.TickerClock \ "Ticking Clock" where JINI_HOME is replaced by the directory name where you installed Jini. The first parameter (codebase) lets the service tell clients where the downloadable files are; the second parameter (security) sets the policy for what remote code is allowed to do to this service. The third parameter is the main class file, and the last parameter is just a string to be displayed as the title in the window frame. You should see a clock like the one shown in Figure 1-2, flashing every second.

Figure 12-4. Recent file chooser dialog used in a text editor The code in Listing 12-7 sets up the text editing application. Two buttons allow you to open an existing file using a GtkFileChooserDialog and save your changes. Then, there is a GtkMenuToolButton that provides two functions. When the button is clicked, a GtkRecentChooserDialog is displayed that allows you to select a recent file from the list. The menu in the GtkMenuToolButton widget is of the type GtkRecentChooserMenu, which shows the ten most recent files.

I Note You can find more information about concurrency at http://www.strangelights.com/fsharp/

Listing 12-7. Remembering Recently Opened Files (recentfiles.c) #include <gtk/gtk.h> typedef struct { GtkWidget *window; GtkWidget *textview; } Widgets; static static static static void void void void open_file (GtkButton*, Widgets*); save_file (GtkButton*, Widgets*); open_recent_file (GtkButton*, Widgets*); menu_activated (GtkMenuShell*, Widgets*);

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