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There are a few interesting items in this function. The first is the echo statement that sends the data to the pipe file. This command is sent to the background, and then the wait command is issued to wait for the most recent background task to finish executing. The echo command requires these steps to send the data to the pipe file and force it to hang until the parent process has read the data from the other end of the pipe. This is somewhat counterintuitive, but this technique is required for the script to work. The second group of items is the set -m and set +m lines. These lines, taken together, allow the pipe file to act like a co-process by sending only one data element at a time. When working with pipe files from the command line as demonstrated previously, this isn t necessary, but it is required when running a script. The set -m directive turns on the monitor mode, which enables job control. Monitor mode is not set by default for background tasks. Job control allows suspension and resumption of specified tasks. This is the key ingredient to make this script work. The script calls the function as a background task. It starts the loop that will read the background function output through the pipe file. The loop simply assigns the variable to the value it receives from the pipe file. After every read statement, the backgrounded some_function completes and loops to its next echo output, which is then written to the pipe.

time set the EventName in the Triggers bucket to Loaded and the StateName to the MouseLeave State. This will make the Buttons and decorations fly off screen as soon as the application is loaded. Your Properties panel should look like what I have in Figure 6-83.

Another type of widget called a scale allows you to provide a horizontal or vertical slider that can choose an integer or a floating-point number. GtkHScale is a horizontal scale widget, and GtkVScale is a vertical scale widget. Both of these classes are derived from GtkScale, which provides properties, signals, and functions. The functionality of the GtkScale widget is not much different from GtkSpinButton. It is often used when you want to restrict the user from entering values, since the value is chosen by moving the slider. Figure 4-7 shows a screenshot of two horizontal scale widgets.

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Figure 4-7. Horizontal scale widgets Scales provide essentially the same functionality as spin buttons, except using a slider chooses the number. To show the similarities between the widgets, Listing 4-7 implements the same functionality as Listing 4-6: two sliders allow the user to select an integer and a floating-point number.

Figure 6-83. Edit the properties for the third and final GoToStateAction Behavior. Now if you press F5 to run the application, you will see that the Buttons and decorations do in fact fly off when the application loads. Place your mouse over the application and watch as the Buttons and decorations fly back into view. Move your mouse off and watch them fly off again. Pretty cool, yes The

some_function $thevar & for i in 1 2 3 4 5 6 do read read_var < $pipe echo The read_var is $read_var sleep .005s done

Listing 4-7. Integer and Floating-point Number Selection with Scales (scales.c) #include <gtk/gtk.h> int main (int argc, char *argv[]) { GtkWidget *window, *scale_int, *scale_float, *vbox; gtk_init (&argc, &argv); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "Scales"); gtk_container_set_border_width (GTK_CONTAINER (window), 10); gtk_widget_set_size_request (window, 250, -1); /* Create a scale that scrolls integers and one that scrolls floating point. */ scale_int = gtk_hscale_new_with_range (0.0, 10.0, 1.0); scale_float = gtk_hscale_new_with_range (0.0, 1.0, 0.1); /* Set the number of decimal places to display for each widget. */ gtk_scale_set_digits (GTK_SCALE (scale_int), 0); gtk_scale_set_digits (GTK_SCALE (scale_float), 1); /* Set the position of the value with respect to the widget. */ gtk_scale_set_value_pos (GTK_SCALE (scale_int), GTK_POS_RIGHT); gtk_scale_set_value_pos (GTK_SCALE (scale_float), GTK_POS_LEFT); vbox = gtk_vbox_new (FALSE, 5); gtk_box_pack_start_defaults (GTK_BOX (vbox), scale_int); gtk_box_pack_start_defaults (GTK_BOX (vbox), scale_float); gtk_container_add (GTK_CONTAINER (window), vbox); gtk_widget_show_all (window); gtk_main (); return 0; } There are two ways to create new scale widgets. The first is with gtk_hscale_new() or gtk_vscale_new(), which accepts a GtkAdjustment that defines how the scale will work. GtkWidget *gtk_hscale_new (GtkAdjustment *adjustment); Alternatively, you can create scales with gtk_hscale_new_with_range() or gtk_vscale_new_with_range(). This function accepts the minimum value, the maximum value, and the step increment of the scale.

VSM allowed us to quickly and easily create very cool transition effects for our Media Player, all without writing a single line of code. Let s now talk about Easing functions that will make our animations a little more realistic and fun.

The sleep command issued here adds a slight delay to the main loop. When we have two asynchronous loops running at the same time, it is often, but not always, the case that the main loop iterates faster than the background task can send the next value. The delay is then needed to align the two loops, although your mileage may vary and you may need to tune the loops since their speeds are, ultimately, system-dependent.

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