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