wxPython: how to determine source of an event

Question

I have a Panel with several images on it, each of which is bound to the same event handler. How can I determine which image is being clicked from the event handler? I tried using Event.GetEventObject() but it returns the parent panel instead of the image that was clicked.

Here's some sample code:

import math
import wx

class MyFrame(wx.Frame):

    def __init__(self, parent, id=-1,title="",pos=wx.DefaultPosition,
         size=wx.DefaultSize, style=wx.DEFAULT_FRAME_STYLE,
         name="frame"):

        wx.Frame.__init__(self,parent,id,title,pos,size,style,name)

        self.panel = wx.ScrolledWindow(self,wx.ID_ANY)
        self.panel.SetScrollbars(1,1,1,1)

        num = 4
        cols = 3
        rows = int(math.ceil(num / 3.0))
        sizer = wx.GridSizer(rows=rows,cols=cols)

        filenames = []
        for i in range(num):
            filenames.append("img"+str(i)+".png")
        for fn in filenames:
            img = wx.Image(fn,wx.BITMAP_TYPE_ANY)
            img2 = wx.BitmapFromImage(img)
            img3 = wx.StaticBitmap(self.panel,wx.ID_ANY,img2)
            sizer.Add(img3)
            img3.Bind(wx.EVT_LEFT_DCLICK,self.OnDClick)

        self.panel.SetSizer(sizer)
        self.Fit()

    def OnDClick(self, event):

        print event.GetEventObject() 

if __name__ == "__main__":

    app = wx.PySimpleApp()
    frame = MyFrame(None)
    frame.Show()
    app.MainLoop()

Answer 1

Call GetId() on your event in the handler and compare the id it returns to the ids of your staticBitmaps. If you need an example let me know and Ill update my answer

Answer 2

In your loop, give each StaticBitmap widget a unique name. One way to do this would be something like this:

wx.StaticBitmap(self, wx.ID_ANY, 
                wx.BitmapFromImage(img),
                name="bitmap%s" % counter)

And then increment the counter at the end. Then in the event handler, do something like this:

widget = event.GetEventObject()
print widget.GetName()

That's always worked for me.