bitbake/depexp: Factor ProgressBar into a separate class in crumbs/

ProgressBar will be useful in other UI elements so make it it's own class.
Make ProgressBar a subclass of gtk.Dialog, rather than gtk.Window, so that we
can suggest the window manager parent the ProgressBar to the widget passed at
as parent.

Signed-off-by: Joshua Lock <josh@linux.intel.com>

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

@@ -0,0 +1,17 @@
+import gtk
+
+class ProgressBar(gtk.Dialog):
+    def __init__(self, parent):
+
+        gtk.Dialog.__init__(self)
+        self.set_title("Parsing metadata, please wait...")
+        self.set_default_size(500, 0)
+        self.set_transient_for(parent)
+        self.set_destroy_with_parent(True)
+        self.progress = gtk.ProgressBar()
+        self.vbox.pack_start(self.progress)
+        self.show_all()
+
+    def update(self, x, y):
+        self.progress.set_fraction(float(x)/float(y))
+        self.progress.set_text("%d/%d (%2d %%)" % (x, y, x*100/y))