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Generation DataMatrix in Font CONTAINER WIDGETS

CHAPTER 3 CONTAINER WIDGETS
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window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "Boxes"); gtk_container_set_border_width (GTK_CONTAINER (window), 10); gtk_widget_set_size_request (window, 200, -1); vbox = gtk_vbox_new (TRUE, 5); /* Add four buttons to the vertical box. */ for (i = 0; i < NUM_NAMES; i++) { GtkWidget *button = gtk_button_new_with_label (names[i]); gtk_box_pack_start_defaults (GTK_BOX (vbox), button); g_signal_connect_swapped (G_OBJECT (button), "clicked", G_CALLBACK (gtk_widget_destroy), (gpointer) button); } gtk_container_add (GTK_CONTAINER (window), vbox); gtk_widget_show_all (window); gtk_main (); return 0; } Listing 3-1 shows a simple illustration of a GtkVBox widget. The graphical output of the application is shown in Figure 3-1. Notice that the names are shown in the same order as they were added to the array, even though each was packed at the start position.
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Figure 3-1. A vertical box packed from the start position In analyzing Listing 3-1, you should note that the GtkVBox and GtkHBox widgets use the same set of functions, because they are both derived from the GtkBox class. The only difference is that vertical boxes are created with gtk_vbox_new() and horizontal boxes with gtk_hbox_new(), although the parameters of each function are the same.
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CHAPTER 3 CONTAINER WIDGETS
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As with every widget, you need to initialize GtkVBox before using the object. The first parameter in gtk_vbox_new() indicates whether all of the children in the box should be homogeneous. If it is set to TRUE, all of the children will be given the smallest amount of space that can fit every widget. GtkWidget* gtk_vbox_new (gboolean homogeneous, gint spacing); The second parameter places a default number of pixels of spacing between each child and its neighbor. This value can be changed for individual cells as children are added, if the box is not set as equally spaced. Since you do not need further access to the labels in Listing 3-1 after they are added to the GtkBox widget, the application does not store individual pointers to each object. They will all be cleaned up automatically when the parent is destroyed. Each button is then added to the box using a method called packing. By adding widgets to the box with gtk_box_pack_start_defaults(), the child has three properties automatically set: Expanding is set to TRUE, which will automatically provide the cell with the extra space allocated to the box. This space is distributed evenly to all of the cells that request it. The fill property is also set to TRUE, which means the widget will expand into all of the extra space provided instead of filling it with padding. Lastly, the amount of padding placed between the cell and its neighbors is set to zero pixels. void gtk_box_pack_start_defaults (GtkBox *box, GtkWidget *widget); Packing boxes can be slightly unintuitive because of the naming of functions. The best way to think about it is in terms of where the packing begins. If you pack at the start position, children will be added with the first child appearing at the top or left. If you pack at the end position, the first child will appear at the bottom or right of the box. In other words, the reference position for start moves as you add widgets. When adding widgets to the end position, the same process occurs. Therefore, you should use gtk_box_pack_end() or gtk_box_pack_end_defaults() to add elements in reverse order. An example of this can be seen in the code excerpt in Listing 3-2. Listing 3-2. Specifying Packing Parameters (boxes2.c) vbox = gtk_vbox_new (TRUE, 5); /* Add four buttons to the vertical box, packing at the end. */ for (i = 0; i < NUM_NAMES; i++) { GtkWidget *button = gtk_button_new_with_label (names[i]); gtk_box_pack_end (GTK_BOX (vbox), button, FALSE, FALSE, 5); g_signal_connect_swapped (G_OBJECT (button), "clicked", G_CALLBACK (gtk_widget_destroy), (gpointer) button); }
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