class Droppable:
"""An object that can be dropped onto. (Part of the Drag & Drop protocol.)
Initially droppable is disabled, users must call set_droppable(True) to
enable it.
"""
def __init__(self):
pass
def drop(self,event):
"""A draggable has been dropped onto this droppable.
Subclasses should extend this if they want to do something."""
# Finish any intervals that are playing.
# FIXME: this tightly couples Droppable to Highlightable. Move this code
# into highlightable.
if hasattr(self,'scaleDownInterval') and self.scaleDownInterval.isPlaying():
self.scaleDownInterval.finish()
elif hasattr(self,'scaleUpInterval') and self.scaleUpInterval.isPlaying():
self.scaleUpInterval.finish()
# Reset the scale.
if hasattr(self,'prevScale'):
self.setScale(self.prevScale)
def set_droppable(self,b):
"""Enable or disable dropping onto the NodePath."""
# FIXME: move this into Highlightable.
# Finish any intervals that are playing.
if hasattr(self,'scaleDownInterval') and self.scaleDownInterval.isPlaying():
self.scaleDownInterval.finish()
elif hasattr(self,'scaleUpInterval') and self.scaleUpInterval.isPlaying():
self.scaleUpInterval.finish()
# Reset the scale.
if hasattr(self,'prevScale'):
self.setScale(self.prevScale)
if b is True:
self.np.setPythonTag('droppable',self)
else:
self.np.clearPythonTag('droppable')
def highlight(self):
"""Subclasses should override this method to implement custom drag-over
behaviour."""
# If we are already scaling up, do nothing.
if hasattr(self,'scaleUpInterval') and self.scaleUpInterval.isPlaying():
return
# If we are in the process of scaling down, finish it off immediately.
if hasattr(self,'scaleDownInterval') and self.scaleDownInterval.isPlaying():
self.scaleDownInterval.finish()
from direct.interval.IntervalGlobal import LerpScaleInterval
self.prevScale = self.getScale()
self.scaleUpInterval = LerpScaleInterval(self.np, duration=0.2, scale=self.getScale()*1.2, startScale=self.getScale())
self.scaleUpInterval.start()
def unhighlight(self):
"""Subclasses should override this method to implement custom drag-over
behaviour."""
# If we are already scaling down, do nothing.
if hasattr(self,'scaleDownInterval') and self.scaleDownInterval.isPlaying():
return
# If we are in the process of scaling up, stop.
if hasattr(self,'scaleUpInterval') and self.scaleUpInterval.isPlaying():
self.scaleUpInterval.pause()
from direct.interval.IntervalGlobal import LerpScaleInterval
self.scaleDownInterval = LerpScaleInterval(self.np, duration=0.2, scale=self.prevScale, startScale=self.getScale())
self.scaleDownInterval.start()
class Highlightable:
"""A mixin class that receives notifications from zcanvas when the mouse
pointer enters or leaves its nodepath. These events can be used to highlight
a nodepath as the mouse cursor moves over it. The default implementation
scales the nodepath to 120% of its original size over a 0.2 second interval
when the mouse enters the nodepath, and scales it back over the same amount
of time when the mouse leaves."""
def __init__(self):
pass
def highlight(self):
"""The mouse pointer has entered the bounds of this nodepath. Subclasses
should override this method to implement custom mouse-over behaviour.
"""
# If we are already scaling up, do nothing.
if hasattr(self,'scaleUpInterval') and self.scaleUpInterval.isPlaying():
return
# If we are in the process of scaling down, finish it off immediately.
if hasattr(self,'scaleDownInterval') and self.scaleDownInterval.isPlaying():
self.scaleDownInterval.finish()
from direct.interval.IntervalGlobal import LerpScaleInterval
self.prevScale = self.getScale()
self.scaleUpInterval = LerpScaleInterval(self.np, duration=0.2, scale=self.getScale()*1.2, startScale=self.getScale())
self.scaleUpInterval.start()
def unhighlight(self):
"""The mouse pointer has left the bounds of this nodepath. Subclasses
should override this method to implement custom mouse-over behaviour.
"""
# If we are already scaling down, do nothing.
if hasattr(self,'scaleDownInterval') and self.scaleDownInterval.isPlaying():
return
# If we are in the process of scaling up, stop.
if hasattr(self,'scaleUpInterval') and self.scaleUpInterval.isPlaying():
self.scaleUpInterval.pause()
from direct.interval.IntervalGlobal import LerpScaleInterval
self.scaleDownInterval = LerpScaleInterval(self.np, duration=0.2, scale=self.prevScale, startScale=self.getScale())
self.scaleDownInterval.start()
def set_highlightable(self,boolean):
"""Enable or disable mouse-over highlighting of this nodepath. (When
disabled, the highlight and unhighlight methods will not be
called.)
"""
# Finish any intervals that are playing.
if hasattr(self,'scaleDownInterval') and self.scaleDownInterval.isPlaying():
self.scaleDownInterval.finish()
elif hasattr(self,'scaleUpInterval') and self.scaleUpInterval.isPlaying():
self.scaleUpInterval.finish()
# Reset the scale.
if hasattr(self,'prevScale'):
self.setScale(self.prevScale)
if boolean:
self.np.setPythonTag("highlightable",self)
else:
self.np.clearPythonTag("highlightable")
