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#!/usr/bin/env python
import wx
import images
#----------------------------------------------------------------------
class TestVirtualList(wx.ListCtrl):
def __init__(self, parent, log):
wx.ListCtrl.__init__(
self, parent, -1,
style=wx.LC_REPORT|wx.LC_VIRTUAL|wx.LC_HRULES|wx.LC_VRULES
)
self.log = log
self.il = wx.ImageList(16, 16)
self.idx1 = self.il.Add(images.Smiles.GetBitmap())
empty = self.makeBlank()
self.idx2 = self.il.Add(empty)
self.SetImageList(self.il, wx.IMAGE_LIST_SMALL)
self.InsertColumn(0, "First")
self.InsertColumn(1, "Second")
self.InsertColumn(2, "Third")
self.SetColumnWidth(0, 175)
self.SetColumnWidth(1, 175)
self.SetColumnWidth(2, 175)
self.SetItemCount(1000000)
self.attr1 = wx.ItemAttr()
self.attr1.SetBackgroundColour("yellow")
self.attr2 = wx.ItemAttr()
self.attr2.SetBackgroundColour("light blue")
self.Bind(wx.EVT_LIST_ITEM_SELECTED, self.OnItemSelected)
self.Bind(wx.EVT_LIST_ITEM_ACTIVATED, self.OnItemActivated)
self.Bind(wx.EVT_LIST_ITEM_DESELECTED, self.OnItemDeselected)
def makeBlank(self):
empty = wx.Bitmap(16,16,32)
dc = wx.MemoryDC(empty)
dc.SetBackground(wx.Brush((0,0,0,0)))
dc.Clear()
del dc
empty.SetMaskColour((0,0,0))
return empty
def OnItemSelected(self, event):
self.currentItem = event.Index
self.log.WriteText('OnItemSelected: "%s", "%s", "%s", "%s"\n' %
(self.currentItem,
self.GetItemText(self.currentItem),
self.getColumnText(self.currentItem, 1),
self.getColumnText(self.currentItem, 2)))
def OnItemActivated(self, event):
self.currentItem = event.Index
self.log.WriteText("OnItemActivated: %s\nTopItem: %s\n" %
(self.GetItemText(self.currentItem), self.GetTopItem()))
def getColumnText(self, index, col):
item = self.GetItem(index, col)
return item.GetText()
def OnItemDeselected(self, evt):
self.log.WriteText("OnItemDeselected: %s" % evt.Index)
#-----------------------------------------------------------------
# These methods are callbacks for implementing the "virtualness"
# of the list... Normally you would determine the text,
# attributes and/or image based on values from some external data
# source, but for this demo we'll just calculate them
def OnGetItemText(self, item, col):
return "Item %d, column %d" % (item, col)
def OnGetItemImage(self, item):
if item % 3 == 0:
return self.idx1
else:
return self.idx2
def OnGetItemAttr(self, item):
if item % 3 == 1:
return self.attr1
elif item % 3 == 2:
return self.attr2
else:
return None
class TestVirtualListPanel(wx.Panel):
def __init__(self, parent, log):
wx.Panel.__init__(self, parent, -1, style=wx.WANTS_CHARS)
self.log = log
sizer = wx.BoxSizer(wx.VERTICAL)
if wx.Platform == "__WXMAC__" and \
hasattr(wx.GetApp().GetTopWindow(), "LoadDemo"):
self.useNative = wx.CheckBox(self, -1, "Use native listctrl")
self.useNative.SetValue(
not wx.SystemOptions.GetOptionInt("mac.listctrl.always_use_generic") )
self.Bind(wx.EVT_CHECKBOX, self.OnUseNative, self.useNative)
sizer.Add(self.useNative, 0, wx.ALL | wx.ALIGN_RIGHT, 4)
self.list = TestVirtualList(self, self.log)
sizer.Add(self.list, 1, wx.EXPAND)
self.SetSizer(sizer)
self.SetAutoLayout(True)
def OnUseNative(self, event):
wx.SystemOptions.SetOptionInt("mac.listctrl.always_use_generic", not event.IsChecked())
wx.GetApp().GetTopWindow().LoadDemo("ListCtrl_virtual")
#----------------------------------------------------------------------
def runTest(frame, nb, log):
win = TestVirtualListPanel(nb, log)
return win
#----------------------------------------------------------------------
overview = """\
This example demonstrates the ListCtrl's Virtual List features. A Virtual list
can contain any number of cells, but data is not loaded into the control itself.
It is loaded on demand via virtual methods <code>OnGetItemText(), OnGetItemImage()</code>,
and <code>OnGetItemAttr()</code>. This greatly reduces the amount of memory required
without limiting what can be done with the list control itself.
"""
if __name__ == '__main__':
import sys,os
import run
run.main(['', os.path.basename(sys.argv[0])] + sys.argv[1:])
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