Modal dialog broken on Unity

Bug #1078694 reported by raananb
This bug affects 2 people
Affects Status Importance Assigned to Milestone
appmenu-gtk (Ubuntu)

Bug Description

An application, developed with wxWidgets (2.9.4), which works on Windows, MacOSX, Ubuntu-Gnome & Ubuntu-XFCE is broken when it is executed under Unity.

Essentially, the application is a wxFrame with a menu, and a menu item displays a dialog using ShowModal() (see below).

In Ubuntu-Gnome and in Ubuntu-XFCE (and Win & MacOSX), the menu is disabled as long as the dialog is displayed, which is the expected behavior.

Under Unity (Ubuntu 12.04.1 LTS & 12.10) the menu is not disabled while the dialog is displayed: each subsequent click on the menu item displays a new dialog window on top of the former dialog windows. Other active elements (buttons) on the wxFrame are disabled while the dialog is displayed, as they should be. The menu should be disabled under Unity as well.

class myFrame: public wxFrame

void myframe::OnMenuitemClick( wxCommandEvent& event )
  myDialog* dp = new myDialog(this);


class myDialog: public wxDialog

Tags: bot-comment
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Ubuntu Foundations Team Bug Bot (crichton) wrote :

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tags: added: bot-comment
raananb (raanan)
affects: ubuntu → unity (Ubuntu)
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Daniel van Vugt (vanvugt) wrote :

Sorry, but we can't help with this until we can reproduce it. Please provide a test program to help us reproduce the problem, or detailed instructions for how to.

affects: unity (Ubuntu) → compiz (Ubuntu)
Changed in compiz (Ubuntu):
status: New → Incomplete
Revision history for this message
raananb (raanan) wrote :

To reproduce this bug, use the sample provided with wxWidgets (2.9.4). Build wxWidgets, then 'make' the sample 'dialogs' under the resuting build (GCCBuildReleaseGTKUnicode & GCCBuildDebugGTKUnicode in my case).

When the resulting 'dialogs' application is launched, select any entry in the Dialogs menu. You will notice that you can continue to select the same or other entries at will, while normally the menu should be disabled after the first dialog is displayed.

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Vadim Zeitlin (vadim-wxwidgets) wrote :

The relevant code inside wxWidgets is in and uses gtk_window_set_transient_for() and gtk_window_set_modal() which doesn't seem to be enough when using Ubuntu global menu bar. Presumably gtk_dialog_run() works (otherwise more people would have complained about this already) but it's not flexible enough to be used in wxWidgets.

Revision history for this message
Launchpad Janitor (janitor) wrote :

[Expired for compiz (Ubuntu) because there has been no activity for 60 days.]

Changed in compiz (Ubuntu):
status: Incomplete → Expired
Revision history for this message
Vadim Zeitlin (vadim-wxwidgets) wrote :

This bug is absolutely trivial to reproduce, here is a minimal GTK+ program which shows it:

#include <gtk/gtk.h>

static void activate_test(GtkMenuItem*, GtkWindow* window)
    GtkWidget* dialog = gtk_message_dialog_new(window, GTK_DIALOG_MODAL,
        GTK_MESSAGE_INFO, GTK_BUTTONS_OK, "a message", NULL);

int main(int argc, char** argv)
    gtk_init(&argc, &argv);
    GtkWidget* window = gtk_window_new(GTK_WINDOW_TOPLEVEL);

    GtkWidget* menu = gtk_menu_new();
    GtkWidget* mi = gtk_menu_item_new_with_mnemonic("_Test");
    g_signal_connect(mi, "activate", G_CALLBACK(activate_test), window);
    gtk_menu_shell_append(GTK_MENU_SHELL(menu), mi);

    mi = gtk_menu_item_new_with_mnemonic("E_xit");
    g_signal_connect(mi, "activate", G_CALLBACK (gtk_main_quit), NULL);
    gtk_menu_shell_append(GTK_MENU_SHELL(menu), mi);
    mi = gtk_menu_item_new_with_mnemonic("_File");
    gtk_menu_item_set_submenu(GTK_MENU_ITEM(mi), menu);

    GtkWidget* menubar = gtk_menu_bar_new();
    gtk_menu_shell_append(GTK_MENU_SHELL(menubar), mi);
    gtk_container_add(GTK_CONTAINER(window), menubar);

    g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
    return 0;

The menu stays enabled while the message box is shown and so multiple message boxes can be opened.

Ubuntu behaviour here totally breaks the application logic and is incompatible with GTK+ on all the other systems. It's amazing that this is apparently not considered to be a problem at all.

Changed in compiz (Ubuntu):
status: Expired → Confirmed
Revision history for this message
Vadim Zeitlin (vadim-wxwidgets) wrote :

This is related to the global menu and not compiz.

affects: compiz (Ubuntu) → appmenu-gtk (Ubuntu)
Revision history for this message
Lars Karlitski (larsu) wrote :

Thanks for reporting this bug. I'm marking it as a duplicate of bug #674605

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