Hob: forbid users to exit Hob directly when Hob is busy

When Hob is busy with generating data, exiting Hob is not allowed.
That should be reasonable because at that time the mouse cursor is not a pointer.
If users want to exit, they can click "Stop" first and then do exit.

That is also a walkaround for [Yocto #2142]

(Bitbake rev: ad7f6bf3c7c4c15d546781aaefdaf03f00193f7c)

Signed-off-by: Shane Wang <shane.wang@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/ui/crumbs/builder.py

@@ -298,6 +298,9 @@ class Builder(gtk.Window):
         # Indicate whether user has customized the image
         self.customized = False
 
+        # Indicate whether the UI is working
+        self.sensitive = True
+
         # create visual elements
         self.create_visual_elements()
 
@@ -610,6 +613,7 @@ class Builder(gtk.Window):
             self.get_root_window().set_cursor(gtk.gdk.Cursor(gtk.gdk.LEFT_PTR))
         else:
             self.get_root_window().set_cursor(gtk.gdk.Cursor(gtk.gdk.WATCH))
+        self.sensitive = sensitive
 
 
     def handler_generating_data_cb(self, handler):
@@ -764,6 +768,8 @@ class Builder(gtk.Window):
         self.build_details_page.show_issues()
 
     def destroy_window_cb(self, widget, event):
+        if not self.sensitive:
+            return True
         lbl = "<b>Do you really want to exit the Hob image creator?</b>"
         dialog = CrumbsMessageDialog(self, lbl, gtk.STOCK_DIALOG_INFO)
         button = dialog.add_button("Cancel", gtk.RESPONSE_NO)