I’m using a one-column (report view) list control to present a list of items. I want the user to be able to select multiple items. I’ve noticed that using CTRL-Click or SHIFT-Click triggers one wx.EVT_LIST_ITEM_SELECTED event for each item selected. This is not a problem for single item selection, however, on multi-select, for example, selecting items 3-9, it means that the event is triggered seven times resulting in the processing of items
3
3,4
3,4,5
3,4,5,6
3,4,5,6,7
3,4,5,6,7,8
3,4,5,6,7,8,9
For obvious reasons this is not desirable. Because there is no way to determine when the user is doing a multiple selection I don’t see how this can be easily managed. This must be a frequent concern so I imagine there is a solution. Rather than re-inventing the wheel perhaps someone can suggest an approach. Here is some code to demonstrate the problem.
import wx
class MyApp(wx.App):
def OnInit(self):
frame = Frame()
return True
class Frame(wx.Frame):
def __init__(self,parent=None,id=-1):
wx.Frame.__init__(self, None, -1)
self.panel = Panel(self)
self.SetSize(200, 400)
self.Show()
class Panel(wx.Panel):
def __init__(self, parent):
wx.Panel.__init__(self, parent, -1)
self.list = wx.ListCtrl(self, wx.ID_ANY, style=wx.LC_NO_HEADER | wx.LC_REPORT)
self.list.Bind(wx.EVT_LIST_ITEM_SELECTED, self.OnClick)
self.list.AppendColumn('',width=200)
names = 'one two three four five six seven eight nine ten eleven twelve'.split()
for indx,name in enumerate(names):
self.list.InsertItem(indx,name)
sizer = wx.BoxSizer(wx.VERTICAL)
sizer.Add(self.list, 1, wx.ALIGN_LEFT | wx.EXPAND, 0)
self.SetSizer(sizer)
def OnClick(self, evt):
lst = evt.GetEventObject()
print('\nCount=',lst.GetSelectedItemCount())
indx = lst.GetFirstSelected()
while indx != -1:
name = lst.GetItemText(indx)
print(f'{indx=} {name=}')
indx = lst.GetNextSelected(indx)
if __name__ == '__main__':
app = wx.App(False)
frame = Frame()
app.MainLoop()