回复： Re: [wxPython-users] 回复： [wxPython-users] ListCtrl

[光华 陶]

this is my way:
   
      def CustColumnSorter(self, key1, key2):
        col = self._col
        ascending = self._colSortFlag[col]
        item1 = self.itemDataMap[key1][col]
        item2 = self.itemDataMap[key2][col]
  
        if col in self.num_cols:
              #just convert them to float, cmp do comparing float well
            item1 = float(item1)
            item2 = float(item2)
    
        cmpVal = cmp(item1, item2)
    
        # If the items are equal then pick something else to make the sort value unique
        if cmpVal == 0:
            cmpVal = apply(cmp, self.GetSecondarySortValues(col, key1, key2))
    
        if ascending:
            return cmpVal
        else:
            return -cmpVal
   
      def GetColumnSorter(self):
        return self.CustColumnSorter

James Bigler <bigler at cs.utah.edu> 写道：
  光华 陶 wrote:
> tell the listctrl which cloumns are numeric, say num_cols=[1,5,6]
> then:
> ....
> if col in num_cols:
> value1 = float(value1)
> value2 = float(value2)
> ....
> I do sort numeric cloumns this way. 
> James Bigler 写道：
> I'm going through chapter 13 from the wP in Action book and I'm wondering if 
> there is a way to get the sorting not by string but by some other method (such 
> as numerically). I'm looking at the code from list_report_colsort.py.
> 
> Thanks,
> James

I'm not sure what you had in mind, but this is how I did it.

I overrode the GetColumnSorter to choose which sorting function to use based on
the column being sorted. I also added a new NumericalColumnSorter that cast the
arguments to floats and did a comparison.

Not the most efficient way of doing it, as I would like to store the numerical
values as floats instead of strings. Suggestions are welcome.

As far at the demo code is concerned, I tested this by making some of the
numbers have fewer digits, so 8435 would be before 84200.

James

class DemoFrame(wx.Frame, wx.lib.mixins.listctrl.ColumnSorterMixin):
def __init__(self):
...
self.numericalColums = [0]
...

# Override the parent function to choose which sorter to use.
def GetColumnSorter(self):
if self._col in self.numericalColums:
return self.NumericalColumnSorter
else:
# Call the original one to get access to the private
# version that handles strings.
return wx.lib.mixins.listctrl.ColumnSorterMixin.GetColumnSorter(self)

def NumericalColumnSorter(self, key1, key2):
col = self._col
ascending = self._colSortFlag[col]
item1 = float(self.itemDataMap[key1][col])
item2 = float(self.itemDataMap[key2][col])

cmpVal = item1-item2

# If the items are equal then pick something else to make the
# sort value unique
if cmpVal == 0:
cmpVal = apply(cmp, self.GetSecondarySortValues(col, key1, key2))

if ascending:
return cmpVal
else:
return -cmpVal

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Artman Tao
 		
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