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""" Defines the BroadcasterTool class.
"""
from enable.api import BaseTool
from traits.api import Dict, List
class BroadcasterTool(BaseTool):
""" A simple tool that keeps a list of other tools, and broadcasts events it
receives to all of the tools.
"""
# The tools to which this tool broadcasts events.
tools = List
# Mapping from tools to transforms, for tools that can be mouse owners.
# (See enable.AbstractWindow.)
mouse_owners = Dict
def dispatch(self, event, suffix):
""" Dispatches a mouse event based on the current event state.
Overrides BaseTool.
"""
handled = False # keeps track of whether any tool handled this event
if event.window.mouse_owner == self:
tools = self.mouse_owners.keys()
mouse_owned = True
else:
tools = self.tools
mouse_owned = False
for tool in tools:
if mouse_owned:
event.window.set_mouse_owner(tool, self.mouse_owners[tool])
tool.dispatch(event, suffix)
if event.handled:
handled = True
event.handled = False
if mouse_owned and event.window.mouse_owner is None:
# The tool owned the mouse before handling the previous event,
# and now doesn't, so remove it from the list of mouse_owners
del self.mouse_owners[tool]
elif not mouse_owned and event.window.mouse_owner == tool:
# The tool is a new mouse owner
self.mouse_owners[tool] = event.window.mouse_owner_transform
if len(self.mouse_owners) == 0:
if event.window.mouse_owner == self:
event.window.set_mouse_owner(None)
else:
event.window.set_mouse_owner(self, event.net_transform())
event.handled = handled
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