Show arrows only when the icons does not fit.
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@ -22,7 +22,14 @@ from sugar.graphics.toolbutton import ToolButton
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from sugar.graphics.icon import Icon
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class _TrayViewport(gtk.Viewport):
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__gproperties__ = {
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'can-scroll' : (bool, None, None, False,
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gobject.PARAM_READABLE),
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}
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def __init__(self):
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self._can_scroll = False
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gobject.GObject.__init__(self)
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self.set_shadow_type(gtk.SHADOW_NONE)
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@ -32,6 +39,8 @@ class _TrayViewport(gtk.Viewport):
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self.add(self.traybar)
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self.traybar.show()
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self.connect('size_allocate', self._size_allocate_cb)
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def scroll_right(self):
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adj = self.get_hadjustment()
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new_value = adj.value + self.allocation.width
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@ -42,6 +51,21 @@ class _TrayViewport(gtk.Viewport):
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new_value = adj.value - self.allocation.width
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adj.value = max(adj.lower, new_value)
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def do_get_property(self, pspec):
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if pspec.name == 'can-scroll':
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return self._can_scroll
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def _size_allocate_cb(self, viewport, allocation):
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bar_requisition = self.traybar.get_child_requisition()
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if bar_requisition[0] < allocation.width:
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can_scroll = False
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else:
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can_scroll = True
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if can_scroll != self._can_scroll:
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self._can_scroll = can_scroll
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self.notify('can-scroll')
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class HTray(gtk.HBox):
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def __init__(self, **kwargs):
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gobject.GObject.__init__(self, **kwargs)
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@ -55,9 +79,10 @@ class HTray(gtk.HBox):
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icon.show()
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self.pack_start(self._scroll_left, False)
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self._scroll_left.show()
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self._viewport = _TrayViewport()
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self._viewport.connect('notify::can-scroll',
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self._viewport_can_scroll_changed_cb)
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self.pack_start(self._viewport)
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self._viewport.show()
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@ -70,6 +95,10 @@ class HTray(gtk.HBox):
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icon.show()
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self.pack_start(self._scroll_right, False)
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def _viewport_can_scroll_changed_cb(self, viewport, pspec):
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if self._viewport.props.can_scroll:
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self._scroll_left.show()
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self._scroll_right.show()
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def _scroll_left_cb(self, button):
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@ -41,6 +41,15 @@ for i in range(0, 100):
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tray.add_item(button)
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button.show()
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tray = HTray()
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box.pack_start(tray, False)
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tray.show()
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for i in range(0, 10):
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button = TrayButton(icon_name=theme_icons[i])
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tray.add_item(button)
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button.show()
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test.pack_start(box)
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box.show()
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