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The GnomeApp widget is the basic widget for Gnome applications. This widget is the main window holding menus, toolbars, and data. You use the gnome_app_new function to create a new GnomeApp widget. This function takes as its argument the name of the application. To add elements such as toolbars, menus, and status bars to the widget, you just use the appropriate function. For example, to add a menu, use gnome_app_set_menus, and to add a status bar use gnome_app_set_statusbar. To add just a single toolbar, use gnome_app_set_toolbar, and to add multiple toolbars use gnome_app_add_toolbar. With the gnome-app-helper functions, you can generate menus and toolbars automatically using GnomeUIInfo structures. For toolbars and menus, you can create GnomeUIInfo structures for them with the appropriate values and then use gnome_app_create_menus to create menus and gnome_app_create_toolbar to create toolbars. With the GNOMEUIINFO_ITEM macro, you can add an item to a menu. The GNOMEUIINFO_SEPARATOR macro adds a separator line, and the GNOMEUIINFO_END macro specifies the end of menu. In the following example, label is the text of the label, tooltip is the tooltip that will be displayed when the pointer moves over that item, and callback is the function that is executed when the user clicks that item. You can add another argument for an icon image if you want an icon displayed in the menu item. This is usually a .xpm image.
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GNOMEUIINFO_ITEM(label, tooltip, callback)
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To specify an accelerator key for a particular item, you just place an underscore before the letter in the label for the key you want to use. An accelerator key is an alternative key you can use to access the menu item. This is usually an ALT key. In the following example, the menu item will have an Exit label with the "x" underlined, indicating that you can use an ALT-X key combination to access this item.
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GNOMEUIINFO_ITEM("E_xit", "Exit the program", exitfunc)
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The GNOMEUINFO_ITEM macro generates the values to be used in a GnomeUIInfo structure. You can assign these values to such a structure. In the following example, a menu is created consisting of an array of GnomeUIInfo structures, and GnomeUIInfo macros are used to assign values to each GnomeUIInfo structure in this array. In this example, a simple File menu is created with two entries, one for Open and one for Exit. A line separator will be displayed between them.
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GnomeUIInfo file_menu[] = { GNOMEUIINFO_ITEM("_Open", "Open a document", openfunc), GNOMEUIINFO_SEPARATOR,
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GNOMEUIINFO_ITEM("E_xit", "Exit the program", exitfunc), GNOMEUIINFO_END };
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A number of macros are provided for standard menu items, like the Save and Open entries in a File menu. These take as their arguments the function to be executed when the item is selected (cb) and any icon image you want displayed for the entry (data). Here is the syntax for these macros:
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GNOMEUIINFO_MENU_OPEN_ITEM(cb, data)
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The following example creates the same simple File menu as in the previous example, but it uses specialized macros to create each item. Here, the GNOMEUIINFO_MENU_EXIT_ITEM macro creates the Exit entry for the menu:
GnomeUIInfo file_menu[] = { GNOMEUIINFO_MENU_OPEN_ITEM(openfunc), GNOMEUIINFO_SEPARATOR, GNOMEUIINFO_MENU_EXIT_ITEM(exitfunc), GNOMEUIINFO_END };
For submenus and for menus added to your menu bar, you use the GNOMEUIINFO_SUBTREE(label, tree) macro, where tree is the array of GnomeUIInfo structures to be used for that submenu. The following example assigns the File menu defined earlier and an Edit menu to a menu bar. Again, these are GnomeUIInfo structures for which the macros generate values. Notice the use of underscores in the labels to designate ALT keys for accessing the menus.
GnomeUIInfo menubar[] = { GNOMEUIINFO_SUBTREE("_FILE", file_menu), GNOMEUIINFO_SUBTREE("_EDIT", edit_menu), GNOMEUIINFO_END };
For particular menus on a menu bar, you use the menu tree macros. The tree argument is the array of GnomeUIInfo structures for the menu. For example, the File menu can be added to the menu bar with the following statement, where tree is the array of GnomeUIInfo structures for the File menu:
GNOMEUIINFO_MENU_FILE_TREE (tree)
The following example is a rewritten version of the menu bar assignment using specialized macros for the File and Edit menus:
GnomeUIInfo menubar[] = { GNOMEUIINFO_MENU_FILE_TREE(file_menu, NULL), GNOMEUIINFO_MENU_EDIT_TREE(edit_menu, NULL), GNOMEUIINFO_END };
Once you have defined your menus, you can create them using the gnome_app_create_menus function. This takes as its arguments the Gnome application
structure and the pointer to the GnomeUIInfo structures you are using for your menu bar. In the previous example, this pointer was the array name "menubar". Each of the elements making up the menubar array, in turn, references a GnomeUIInfo array for their menu.
gnome_app_create_menus (GNOME_APP (app), menubar);
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