Re: Hiding GtkToolButton problem, Win32 specific behaviour or potential bug ?

[Luis Menina <liberforce freeside fr>]

Hi,

You're not using the right callback format for the "clicked" signal.
http://library.gnome.org/devel/gtk/stable/GtkToolButton.html#GtkToolButton-clicked

You're using for both handler 1 and handler 2:
  void user_function (void)

while it should be:
  void user_function (GtkToolButton *toolbutton, gpointer user_data)

When you use a signal, ALWAYS look at the prototype you need to use for 
the callback.

This way, as you do the same thing in both callbacks, you can use a 
single callback to process the signals emitted by both buttons:

void on_toolbutton_clicked (GtkToolButton *toolbutton,
        gpointer user_data)
{
        gtk_widget_hide (GTK_WIDGET (toolbutton));
}

Hope this resolves your problem...

Cheers,

Luis

zylon post cz a écrit :
> Hello,
> I've encountered a problem with hiding a GtkToolButton inserted into GtkToolbar. Consider the small program 
> bellow.
> When pressing button2, this program freezes. I don't know why this happens - I think the reasons may be two:
>
> 1. Using threads on Win32
> 2. Some bug.
>
> The problem appears when using GTK 2.12.X under Windows and does not appear under Linux (GTK 2.10.X 2.12.X) 
> and also does
> not appear when using GTK 2.10.X under Windows. If I remove the threads related code, everything works 
> perfectly on all platforms
> with all versions of GTK.
>
> I've also investigated, that the button being hidden must be first in the toolbar and must have the signal 
> connected, in other
> case the problem does not appear.
>
> What reason is correct ?
>
> Thanks for ideas
>
>
>
> #include <gtk/gtk.h>
>
> GtkWindow *window;
> GtkToolButton *button1;
> GtkToolButton *button2;
> GtkToolbar *toolbar;
>
> void handler1() {
>         gtk_widget_hide(GTK_WIDGET(button2));
>         
>         
> }
>
> void handler2() {
>         /*CRASH*/
>         gtk_widget_hide(GTK_WIDGET(button1));
> }
>
> void quitHandler() {
>         
>         gtk_main_quit();
>         
> }
>
>
> int main(int argc,char* argv[]) {
>         g_thread_init(NULL);
>         gdk_threads_init();
>         gdk_threads_enter();
>         
>         gtk_init(&argc,&argv);
>         
>         /*Window*/
>         window=GTK_WINDOW(gtk_window_new(GTK_WINDOW_TOPLEVEL));
>         
>         /*Toolbar*/
>         toolbar=GTK_TOOLBAR(gtk_toolbar_new());
>         
>         /*Buttons*/
>         button1=GTK_TOOL_BUTTON(gtk_tool_button_new_from_stock("gtk-add"));
>         button2=GTK_TOOL_BUTTON(gtk_tool_button_new_from_stock("gtk-edit"));
>         
>         gtk_toolbar_insert(toolbar,GTK_TOOL_ITEM(button1),0);
>         gtk_toolbar_insert(toolbar,GTK_TOOL_ITEM(button2),1);
>         
>         gtk_container_add(GTK_CONTAINER(window),GTK_WIDGET(toolbar));
>         
>         /*Show all*/
>         gtk_widget_show_all(GTK_WIDGET(window));
>         gtk_widget_show(GTK_WIDGET(window));
>         
>         g_signal_connect(G_OBJECT(button1),"clicked",G_CALLBACK(handler1),NULL);
>         g_signal_connect(G_OBJECT(button2),"clicked",G_CALLBACK(handler2),NULL);
>         g_signal_connect(G_OBJECT(window),"delete_event",G_CALLBACK(quitHandler),NULL);
>         
>         gtk_main();
>         
>         gdk_threads_leave();
> }
>
>
>
>
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