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import wx
import sys, glob, random
import data
class DataSource:
"""
A simple data source class that just uses our sample data items.
A real data source class would manage fetching items from a
database or similar.
"""
def GetColumnHeaders(self):
return data.columns
def GetCount(self):
return len(data.rows)
def GetItem(self, index):
return data.rows[index]
def UpdateCache(self, start, end):
pass
class VirtualListCtrl(wx.ListCtrl):
"""
A generic virtual listctrl that fetches data from a DataSource.
"""
def __init__(self, parent, dataSource):
wx.ListCtrl.__init__(self, parent,
style=wx.LC_REPORT|wx.LC_SINGLE_SEL|wx.LC_VIRTUAL)
self.dataSource = dataSource
self.Bind(wx.EVT_LIST_CACHE_HINT, self.DoCacheItems)
self.SetItemCount(dataSource.GetCount())
columns = dataSource.GetColumnHeaders()
for col, text in enumerate(columns):
self.InsertColumn(col, text)
def DoCacheItems(self, evt):
self.dataSource.UpdateCache(
evt.GetCacheFrom(), evt.GetCacheTo())
def OnGetItemText(self, item, col):
data = self.dataSource.GetItem(item)
return data[col]
def OnGetItemAttr(self, item): return None
def OnGetItemImage(self, item): return -1
class DemoFrame(wx.Frame):
def __init__(self):
wx.Frame.__init__(self, None, -1,
"Virtual wx.ListCtrl",
size=(600,400))
self.list = VirtualListCtrl(self, DataSource())
app = wx.PySimpleApp()
frame = DemoFrame()
frame.Show()
app.MainLoop()
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