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"""
DeleteNodeTool.py - tool for deleting nodes
$Id$
"""
from demoapp.foundation.MouseBehavior import Tool, Transition
from demoapp.tools.HuntForClickAction_ToolStateBehavior import HuntForClickAction_ToolStateBehavior
from demoapp.models.TrivalentGraph_Graphics import TrivalentGraph_HighlightGraphics
# ==
class _HuntForNode(HuntForClickAction_ToolStateBehavior): # rename?
"""
Clicking on nodes deletes them.
"""
def on_mouse_press_would_do(self, x, y, button, modifiers):
"""
"""
model = self.model
obj = self.pane.find_object(x, y) # might be None
hh = self.tool._f_HighlightGraphics_descriptions
if isinstance(obj, model.Node):
# click on any node: delete it
return Transition(
indicators = [hh.tip_text("click to DELETE this node", obj),
hh.highlight_delete(obj),
],
command = ("cmd_deleteNode", obj,),
next_state = (_HuntForNode,) # todo: use SAME_STATE here
)
return None # for anything we don't understand, use handler below us
pass
# ==
class DeleteNodeTool(Tool):
_default_state = (_HuntForNode,)
HighlightGraphics_class = TrivalentGraph_HighlightGraphics
# instance ends up in self._f_HighlightGraphics_instance,
# but this code mostly uses self._f_HighlightGraphics_descriptions instead.
pass
# end
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