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# Abstract classes for parents and children.
#
# Do not use as base class -- this is for documentation only.
#
# Note that the tree must be built top down (create the parent,
# then add the children).
#
# Also note that the creation methods are not standardized --
# these have extra parameters dependent on the widget type.
# For historical reasons, button creation methods are called
# define() while split creation methods are called create().
class AbstractParent():
#
# Upcalls from child to parent
#
def addchild(self, child): unimpl()
def delchild(self, child): unimpl()
#
def need_mouse(self, child): unimpl()
def no_mouse(self, child): unimpl()
#
def need_timer(self, child): unimpl()
def no_timer(self, child): unimpl()
#
# XXX need_kbd, no_kbd; focus???
#
def begindrawing(self): return unimpl()
def beginmeasuring(self): return unimpl()
def getwindow(self): return unimpl() # Only for very special cases
#
def change(self, area): unimpl()
def scroll(self, (area, (dh, dv))): unimpl()
def settimer(self, itimer): unimpl()
class AbstractChild():
#
# Downcalls from parent to child
#
def destroy(self): unimpl()
#
def realize(self): return unimpl()
def minsize(self, m): return unimpl()
def getbounds(self): return unimpl()
def setbounds(self, bounds): unimpl()
def draw(self, (d, area)): unimpl()
#
# Downcalls only made after certain upcalls
#
def mouse_down(self, detail): unimpl()
def mouse_move(self, detail): unimpl()
def mouse_up(self, detail): unimpl()
#
def timer(self): unimpl()
# A "Split" is a child that manages one or more children.
# (This terminology is due to DEC SRC, except for CSplits.)
# A child of a split may be another split, a button, a slider, etc.
# Certain upcalls and downcalls can be handled transparently, but
# for others (e.g., all geometry related calls) this is not possible.
class AbstractSplit() = AbstractChild(), AbstractParent():
pass
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