Re: pop-ups

["Michael K. Johnson" <johnsonm redhat com>]

"Michael K. Johnson" writes:
>I've got a bunch of other (preparatory) work to do first before I mess
>with this[...]

OK, I changed my mind.

>Raph, if Peter says that's right, feel free to abuse what I've written
>in any way you want for the menu section of the tutorial if you like.
>Otherwise I may remember to revisit the topic in more detail when I've
>actually done some popup programming instead of only code inspection.

In particular, I have a version of menubar.c which adds popup menus.
It is commented in the same style as the original, except that I have
made all the comments fit in 80 columns because they were so incredibly
distracting at a full 90 columns as shown in the tutorial...  I've
dropped in a button (could be anything) to which I've attached as a
popup the same menu that is also attached to the "Root Menu".  Raph,
I'll write this up soon for the menus section of the tutorial.

michaelkjohnson

"Magazines all too frequently lead to books and should be regarded by the
 prudent as the heavy petting of literature."            -- Fran Lebowitz



#include <gtk/gtk.h>

static gint button_press (GtkWidget *, GdkEvent *);


int main (int argc, char *argv[])
{

    GtkWidget *window;
    GtkWidget *menu;
    GtkWidget *menu_bar;
    GtkWidget *root_menu;
    GtkWidget *menu_items;
    GtkWidget *vbox;
    GtkWidget *button;
    char buf[128];
    int i;

    gtk_init (&argc, &argv);

    /* create a new window */
    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title(GTK_WINDOW (window), "GTK Menu Test");
    gtk_signal_connect(GTK_OBJECT (window), "destroy",
                       (GtkSignalFunc) gtk_exit, NULL);

    /* Init the menu-widget, and remember -- never
     * gtk_show_widget() the menu widget!! 
     * This is the menu that holds the menu items, the one that
     * will pop up when you click on the "Root Menu" in the app */
    menu = gtk_menu_new();

    /* This is the root menu, and will be the label will be the menu name
     * displayed on the menu bar.  There won't be a signal handler attached,
     * as it only pops up the rest of the menu when pressed. */
    root_menu = gtk_menu_item_new_with_label("Root Menu");

    gtk_widget_show(root_menu);

    /* Next we make a little loop that makes three menu-entries for "test-menu".
     * Notice the call to gtk_menu_append.  Here we are adding a list of
     * menu items to our menu.  Normally, we'd also catch the "clicked"
     * signal on each of the menu items and setup a callback for it,
     * but it's omitted here to save space. */

    for(i = 0; i < 3; i++)
        {
            /* Copy the names to the buf. */
            sprintf(buf, "Test-undermenu - %d", i);

            /* Create a new menu-item with a name... */
            menu_items = gtk_menu_item_new_with_label(buf);

            /* ...and add it to the menu. */
            gtk_menu_append(GTK_MENU (menu), menu_items);

            /* Show the widget */
            gtk_widget_show(menu_items);
        }

    /* Now we specify that we want our newly created "menu" to be the menu
     * for the "root menu" */
    gtk_menu_item_set_submenu(GTK_MENU_ITEM (root_menu), menu);

    /* A vbox to put a menu and a button in: */
    vbox = gtk_vbox_new(FALSE, 0);
    gtk_container_add(GTK_CONTAINER(window), vbox);
    gtk_widget_show(vbox);

    /* Create a menu-bar to hold the menus and add it to our main window */
    menu_bar = gtk_menu_bar_new();
    gtk_box_pack_start(GTK_BOX(vbox), menu_bar, FALSE, FALSE, 2);
    gtk_widget_show(menu_bar);

    /* Create a button to which to attach menu as a popup */
    button = gtk_button_new_with_label("press me");
    gtk_signal_connect_object(GTK_OBJECT(button), "event",
	GTK_SIGNAL_FUNC (button_press), GTK_OBJECT(menu));
    gtk_box_pack_end(GTK_BOX(vbox), button, TRUE, TRUE, 2);
    gtk_widget_show(button);

    /* And finally we append the menu-item to the menu-bar -- this is the
     * "root" menu-item I have been raving about =) */
    gtk_menu_bar_append(GTK_MENU_BAR (menu_bar), root_menu);

    /* always display the window as the last step so it all splashes on
     * the screen at once. */
    gtk_widget_show(window);

    gtk_main ();

    return 0;
}



/* Respond to a button-press by posting a menu passed in as widget */

static gint button_press (GtkWidget *widget, GdkEvent *event)
{

    if (event->type == GDK_BUTTON_PRESS) {
        GdkEventButton *bevent = (GdkEventButton *) event; 
        gtk_menu_popup (GTK_MENU(widget), NULL, NULL, NULL, NULL,
                        bevent->button, bevent->time);
        /* Tell calling code that we have handled this event; the buck
         * stops here. */
        return TRUE;
    }

    /* Tell calling code that we have not handled this event; pass it on. */
    return FALSE;
}