c - Implementazione GTK di MessageBox

original title: "c - GTK implementation of MessageBox"

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I have been trying to implement Win32's MessageBox using GTK. The app using SDL/OpenGL, so this isn't a GTK app.

I handle the initialisation (gtk_init) sort of stuff inside the MessageBox function as follows:

int MessageBox(HWND hwnd, const char* text, const char* caption, UINT type)
{
    GtkWidget *window = NULL;
    GtkWidget *dialog = NULL;

    gtk_init(&gtkArgc, &gtkArgv);
    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    g_signal_connect(G_OBJECT(window), "delete_event", G_CALLBACK(delete_event), NULL);
    g_signal_connect(G_OBJECT(window), "destroy", G_CALLBACK(destroy), NULL);
    // gcallback calls gtk_main_quit()
    gtk_init_add((GtkFunction)gcallback, NULL);

    if (type & MB_YESNO) {
        dialog = gtk_message_dialog_new(GTK_WINDOW(window), GTK_DIALOG_DESTROY_WITH_PARENT, GTK_MESSAGE_QUESTION, GTK_BUTTONS_YES_NO, text);
    } else {
        dialog = gtk_message_dialog_new(GTK_WINDOW(window), GTK_DIALOG_DESTROY_WITH_PARENT, GTK_MESSAGE_INFO, GTK_BUTTONS_OK, text);
    }

    gtk_window_set_title(GTK_WINDOW(dialog), caption);
    gint result = gtk_dialog_run(GTK_DIALOG(dialog));

    gtk_main();

    gtk_widget_destroy(dialog);

    if (type & MB_YESNO) {
        switch (result) {
        default:
        case GTK_RESPONSE_DELETE_EVENT:
        case GTK_RESPONSE_NO:
            return IDNO;
            break;
        case GTK_RESPONSE_YES:
            return IDYES;
            break;
        }
    }

    return IDOK;
}

Now, I am by no means an experienced GTK programmer, and I realise that I'm probably doing something horribly wrong.

However, my problem is that the last dialog popped up with this function stays around until the process exits. Any ideas?

fonte

Ho cercato di implementare MessageBox di Win32 utilizzando GTK. L'app utilizza SDL / OpenGL, quindi questa non è un'app GTK. Gestisco l'inizializzazione (gtk_init) roba all'interno della funzione MessageBox ...

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Joe Shaw #1

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Hmm, ok. I'd suggest code like this, then:

typedef struct {
    int type;
    int result;
} DialogData;

static gboolean
display_dialog(gpointer user_data)
{
    DialogData *dialog_data = user_data;
    GtkWidget *dialog;

    if (dialog_data->type & MB_YESNO)
        dialog = gtk_message_dialog_new(...);
    else
        dialog = gtk_message_dialog_new(...);

    // Set title, etc.

    dialog_data->result = gtk_dialog_run(...);

    gtk_main_quit();  // Quits the main loop run in MessageBox()

    return FALSE;
}

int MessageBox(...)
{
    DialogData dialog_data;

    dialog_data.type = type;

    gtk_idle_add(display_dialog, &dialog_data);

    gtk_main();

    // Do stuff based on dialog_data.result
}

The struct is because you need to pass around a couple pieces of data. The gtk_idle_add() call adds a method to be run when the main loop is running and idle, and the FALSE return value from the display_dialog() call means that it's only run once. After we get the result from the dialog, we quit the main loop. That'll cause the gtk_main() in your main MessageBox() method to return, and you'll be able to access the result from there.

Hope this helps!

Platypus #2

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To manage a dialog box with GTK+, use a GtkDialog and gtk_dialog_run() instead of managing a window and a main loop by yourself.

EDIT / ADDENDUM :

What I mean is "just use" : I don't understand why you create a windows you never use and a main loop which seems useless (at least from the piece of code you posted). You can write something as short as :

int MessageBox(HWND hwnd, const char* text, const char* caption, UINT type)
{
    GtkWidget *dialog ;

    /* Instead of 0, use GTK_DIALOG_MODAL to get a modal dialog box */

    if (type & MB_YESNO)
        dialog = gtk_message_dialog_new(NULL, 0, GTK_MESSAGE_QUESTION, GTK_BUTTONS_YES_NO, text );
    else
        dialog = gtk_message_dialog_new(NULL, 0, GTK_MESSAGE_INFO, GTK_BUTTONS_OK, text );


    gtk_window_set_title(GTK_WINDOW(dialog), caption);
    gint result = gtk_dialog_run(GTK_DIALOG(dialog));
    gtk_widget_destroy( GTK_WIDGET(dialog) );

    if (type & MB_YESNO)
    {
        switch (result)
        {
        default:
        case GTK_RESPONSE_DELETE_EVENT:
        case GTK_RESPONSE_NO:
            return IDNO;
        case GTK_RESPONSE_YES:
            return IDYES;
        }
        return IDOK;
    } 
}

Joe Shaw #3
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A few things:

You are creating (and not using) an unnecessary toplevel window, named window. You can just delete these lines:
```
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
g_signal_connect(G_OBJECT(window), "delete_event", G_CALLBACK(delete_event), NULL);
g_signal_connect(G_OBJECT(window), "destroy", G_CALLBACK(destroy), NULL);
```
Also, the flow doesn't seem quite right. gtk_main() starts the GTK main loop, which blocks until something exits it. gtk_dialog_run() also starts a main loop, but it exits as soon as one of the buttons is clicked.

I think it might be enough for you to remove the gtk_init_add() and gtk_main() calls, and simply deal with the return value. Also the gtk_widget_destroy() call is unnecessary, as the dialog window is automatically destroyed when gtk_dialog_run() returns.

c - Implementazione GTK di MessageBox

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