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CHAPTER 9 MENUS AND TOOLBARS
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The last parameter of gtk_ui_manager_add_ui() is a Boolean variable that positions the new UI element with respect to the given path. If set to TRUE, the UI element is inserted before the path. Otherwise, it is inserted after the path.
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From the last section, you will notice that GtkActionEntry accepts a stock identifier to add an image to the item. Because of this, you will, at some point, need to create your own custom stock icons that can be used for nonstandard menu and toolbar items. New stock items are created with three objects: GtkIconSource, GtkIconSet, and GtkIconFactory. Let us work from the bottom up. GtkIconSource is an object that holds a GdkPixbuf or an image filename. It is meant to hold one variant of an image. For example, if you have an image that will be displayed differently when it is enabled or disabled, you would need to have multiple icon sources, one for each state. You may need multiple icon sources for different icon sizes, different languages, or different icon states. Multiple icon sources are organized with GtkIconSet, which holds all of the GtkIconSource objects for one stock image. In some cases, your icon set may only have one image. While this is usually not the case, you can use gtk_icon_set_new_from_pixbuf() to skip the step of creating an icon source. GtkIconSet* gtk_icon_set_new_from_pixbuf (GdkPixbuf *pixbuf); After you have created all of the necessary icon sets, they are added to a GtkIconFactory, which is used to organize all of the stock items for a particular theme. Icon factories are added to a global list that GTK+ searches through to find stock items. In this section, a number of new stock items are going to be created. Figure 9-8 is a screenshot of the new stock items that are created in Listing 9-12.
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Figure 9-8. Custom images added to the global icon factory In Listing 9-12, five new stock items are created including "check-list", "calculator", "screenshot", "cpu", and "desktop". A toolbar item is then created from each of the new stock items and displayed on the screen.
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Listing 9-12. Using GtkIconFactory (iconfactory.c) #include <gtk/gtk.h> #define ICON_LOCATION "/path/to/icons/" typedef struct { gchar *location; gchar *stock_id; gchar *label; } NewStockIcon; const NewStockIcon list[] = { { ICON_LOCATION"checklist.png", "check-list", "Check _List" }, { ICON_LOCATION"calculator.png", "calculator", "_Calculator" }, { ICON_LOCATION"camera.png", "screenshot", "_Screenshots" }, { ICON_LOCATION"cpu.png", "cpu", "CPU _Info" }, { ICON_LOCATION"desktop.png", "desktop", "View _Desktop" }, { NULL, NULL, NULL } }; static void add_stock_icon (GtkIconFactory*, gchar*, gchar*); int main (int argc, char *argv[]) { GtkWidget *window, *toolbar; GtkIconFactory *factory; gint i = 0; gtk_init (&argc, &argv); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "Icon Factory"); gtk_container_set_border_width (GTK_CONTAINER (window), 10); factory = gtk_icon_factory_new (); toolbar = gtk_toolbar_new ();
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CHAPTER 9 MENUS AND TOOLBARS
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/* Loop through the list of items and add new stock items. */ while (list[i].location != NULL) { GtkToolItem *item; add_stock_icon (factory, list[i].location, list[i].stock_id); item = gtk_tool_button_new_from_stock (list[i].stock_id); gtk_tool_button_set_label (GTK_TOOL_BUTTON (item), list[i].label); gtk_tool_button_set_use_underline (GTK_TOOL_BUTTON (item), TRUE); gtk_toolbar_insert (GTK_TOOLBAR (toolbar), item, i); i++; } gtk_icon_factory_add_default (factory); gtk_toolbar_set_style (GTK_TOOLBAR (toolbar), GTK_TOOLBAR_BOTH); gtk_toolbar_set_show_arrow (GTK_TOOLBAR (toolbar), FALSE); gtk_container_add (GTK_CONTAINER (window), toolbar); gtk_widget_show_all (window); gtk_main (); return 0; } /* Add a new stock icon from the given location and with the given stock id. */ static void add_stock_icon (GtkIconFactory *factory, gchar *location, gchar *stock_id) { GtkIconSource *source; GtkIconSet *set; source = gtk_icon_source_new (); set = gtk_icon_set_new (); gtk_icon_source_set_filename (source, location); gtk_icon_set_add_source (set, source); gtk_icon_factory_add (factory, stock_id, set); } Creating a new icon factory, source, or set is as simple as calling gtk_icon_factory_new(), gtk_icon_source_new(), or gtk_icon_set_new(). Each of these functions creates an empty object that is not of any use in its current state. In Listing 9-12, the icon source is initialized to an image found at the specified filename with gtk_icon_source_set_filename(). Alternatively, you can create the icon source out of a GdkPixbuf object with gtk_icon_source_set_pixbuf().
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