97 lines
2.4 KiB
Python
97 lines
2.4 KiB
Python
# A class that sits transparently between a parent and one child.
|
|
# First create the parent, then this thing, then the child.
|
|
# Use this as a base class for objects that are almost transparent.
|
|
# Don't use as a base class for parents with multiple children.
|
|
|
|
Error = 'TransParent.Error' # Exception
|
|
|
|
class ManageOneChild():
|
|
#
|
|
# Upcalls shared with other single-child parents
|
|
#
|
|
def addchild(self, child):
|
|
if self.child:
|
|
raise Error, 'addchild: one child only'
|
|
if not child:
|
|
raise Error, 'addchild: bad child'
|
|
self.child = child
|
|
#
|
|
def delchild(self, child):
|
|
if not self.child:
|
|
raise Error, 'delchild: no child'
|
|
if child <> self.child:
|
|
raise Error, 'delchild: not my child'
|
|
self.child = 0
|
|
|
|
class TransParent() = ManageOneChild():
|
|
#
|
|
# Calls from creator
|
|
# NB derived classes may add parameters to create()
|
|
#
|
|
def create(self, parent):
|
|
parent.addchild(self)
|
|
self.parent = parent
|
|
self.child = 0 # No child yet
|
|
#
|
|
# Downcalls from parent to child
|
|
#
|
|
def destroy(self):
|
|
del self.parent
|
|
if self.child: self.child.destroy()
|
|
del self.child
|
|
#
|
|
def minsize(self, m):
|
|
if not self.child:
|
|
return 0, 0
|
|
else:
|
|
return self.child.minsize(m)
|
|
def getbounds(self, bounds):
|
|
if not self.child:
|
|
raise Error, 'getbounds w/o child'
|
|
else:
|
|
return self.child.getbounds()
|
|
def setbounds(self, bounds):
|
|
if not self.child:
|
|
raise Error, 'setbounds w/o child'
|
|
else:
|
|
self.child.setbounds(bounds)
|
|
def draw(self, args):
|
|
if self.child:
|
|
self.child.draw(args)
|
|
#
|
|
# Downcalls only made after certain upcalls
|
|
#
|
|
def mouse_down(self, detail):
|
|
if self.child: self.child.mouse_down(detail)
|
|
def mouse_move(self, detail):
|
|
if self.child: self.child.mouse_move(detail)
|
|
def mouse_up(self, detail):
|
|
if self.child: self.child.mouse_up(detail)
|
|
#
|
|
def timer(self):
|
|
if self.child: self.child.timer()
|
|
#
|
|
# Upcalls from child to parent
|
|
#
|
|
def need_mouse(self, child):
|
|
self.parent.need_mouse(self)
|
|
def no_mouse(self, child):
|
|
self.parent.no_mouse(self)
|
|
#
|
|
def need_timer(self, child):
|
|
self.parent.need_timer(self)
|
|
def no_timer(self, child):
|
|
self.parent.no_timer(self)
|
|
#
|
|
def begindrawing(self):
|
|
return self.parent.begindrawing()
|
|
def beginmeasuring(self):
|
|
return self.parent.beginmeasuring()
|
|
#
|
|
def change(self, area):
|
|
self.parent.change(area)
|
|
def scroll(self, args):
|
|
self.parent.scroll(args)
|
|
def settimer(self, itimer):
|
|
self.parent.settimer(itimer)
|