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"""Plot overlay which is an Enable Container
This module provides an Enable Container subclass which renders itself
into the overlay of a plot. This allows the easy use of standard Enable
components in plot overlays.
"""
from traits.api import Instance
from enable.api import Container, Component
from chaco.api import PlotComponent
class ContainerOverlay(Container, PlotComponent):
""" Container which is also a Chaco plot overlay
Since this is an Enable container, any Components that it contains will
be rendered into the overlay layer of the plot.
"""
# XXX this works, but I'm not sure that it's quite right.
# The component that this object overlays. This can be None. By default, if
# this object is called to draw(), it tries to render onto this component.
component = Instance(Component)
draw_layer = "overlay"
# The background color (overrides PlotComponent).
# Typically, an overlay does not render a background.
bgcolor = "transparent"
unified_draw = True
auto_size = True
def overlay(self, other, gc, view_bounds, mode):
self.draw(gc, view_bounds, mode)
def _request_redraw(self):
if self.component is not None:
self.component.request_redraw()
super(ContainerOverlay, self)._request_redraw()
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