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TrayViewport: handle the case of the widget not yet allocated in the size-allocate callback - SL #4279

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In the callback, the allocation can be 1x1 if it is yet unknown [1].
This is the case of trays that start hidden by default, like the one
in Browse activity.

[1] http://developer.gnome.org/gtk3/stable/GtkWidget.html#gtk-widget-size-allocate

Signed-off-by: Manuel Kaufmann <humitos@gmail.com>
Signed-off-by: Manuel Quiñones <manuq@laptop.org>
Acked-by: Simon Schampijer <simon@laptop.org>
This commit is contained in:
Manuel Kaufmann 2012-12-04 17:40:26 -03:00 committed by Manuel Quiñones
parent b6152b023a
commit 0788e546f6
1 changed files with 6 additions and 0 deletions
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6
src/sugar3/graphics/tray.py
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@ -137,6 +137,12 @@ class _TrayViewport(Gtk.Viewport):
return self._can_scroll_prev
def _size_allocate_cb(self, viewport, allocation):
if allocation.width == 1 and allocation.height == 1:
# HACK: the first time this callback is called 'width' and
# 'height' are 1 so we mark the Viewport as scrollable and
# we show the Prev / Next buttons
return
bar_minimum, bar_natural = self.traybar.get_preferred_size()
if self.orientation == Gtk.Orientation.HORIZONTAL: