Inheritance diagram for wx.PySizer:
wx.PySizer is a special version of wx.Sizer that has been instrumented to allow the C++ virtual methods to be overloaded in Python derived classes. You would derive from this class if you are wanting to implement a custom sizer in Python code. Simply implement CalcMin and RecalcSizes in the derived class and you’re all set.
For example:
class MySizer(wx.PySizer):
""" A simple wx.PySizer derived class. """
def __init__(self):
""" Default class constructor. """
wx.PySizer.__init__(self)
def CalcMin(self):
"Re-implemented from wx.Sizer.CalcMin. """
for item in self.GetChildren():
# Calculate the total minimum width and height needed
# by all items in the sizer according to this sizer's
# layout algorithm.
DoSizeCalculation(item)
return wx.Size(width, height)
def RecalcSizes(self):
"Re-implemented from wx.Sizer.RecalcSizes. """
# Find the space allotted to this sizer
pos = self.GetPosition()
size = self.GetSize()
for item in self.GetChildren():
# Recalculate (if necessary) the position and size of
# each item and then call item.SetDimension to do the
# actual positioning and sizing of the items within the
# space alloted to this sizer.
item.SetDimension(itemPos, itemSize)
When Layout is called it first calls CalcMin followed by RecalcSizes so you can optimize a bit by saving the results of CalcMin and reusing them in RecalcSizes.
See also
