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# -*- coding: utf-8 -*-
# Copyright (c) Vispy Development Team. All Rights Reserved.
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
from __future__ import division
from ..util.event import Event
class SceneMouseEvent(Event):
"""Represents a mouse event that occurred on a SceneCanvas. This event is
delivered to all entities whose mouse interaction area is under the event.
"""
def __init__(self, event, visual):
self.mouse_event = event
self.visual = visual
Event.__init__(self, type=event.type)
@property
def visual(self):
return self._visual
@visual.setter
def visual(self, v):
self._visual = v
self._pos = None
@property
def pos(self):
"""The position of this event in the local coordinate system of the
visual.
"""
if self._pos is None:
tr = self.visual.get_transform('canvas', 'visual')
self._pos = tr.map(self.mouse_event.pos)
return self._pos
@property
def last_event(self):
"""The mouse event immediately prior to this one. This
property is None when no mouse buttons are pressed.
"""
if self.mouse_event.last_event is None:
return None
ev = self.copy()
ev.mouse_event = self.mouse_event.last_event
return ev
@property
def press_event(self):
"""The mouse press event that initiated a mouse drag, if any."""
if self.mouse_event.press_event is None:
return None
ev = self.copy()
ev.mouse_event = self.mouse_event.press_event
return ev
@property
def button(self):
"""The button pressed or released on this event."""
return self.mouse_event.button
@property
def buttons(self):
"""A list of all buttons currently pressed on the mouse."""
return self.mouse_event.buttons
@property
def delta(self):
"""The increment by which the mouse wheel has moved."""
return self.mouse_event.delta
@property
def scale(self):
"""The scale of a gesture_zoom event"""
try:
return self.mouse_event.scale
except AttributeError:
errmsg = f"SceneMouseEvent type '{self.type}' has no scale"
raise TypeError(errmsg)
def copy(self):
ev = self.__class__(self.mouse_event, self.visual)
return ev
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