WxPython: how to determine the source of an event

Question

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

Here is a 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

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() 

It always worked for me.

Answer 2

Call GetId() on your event in the handler and compare the identifier that it returns to the identifiers of your staticBitmaps. If you need an example let me know and I updated my answer

Answer 3

You can use GetId (), but make sure you save it in your program. I am posting modified code to show how you can do this. Despite using the file names in the list.

 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) #you should use dict and map all id to image files filenames = [] for i in range(num): filenames.append("img"+str(i)+".png") for imgid,fn in enumerate(filenames): img = wx.Image(fn,wx.BITMAP_TYPE_ANY) img2 = wx.BitmapFromImage(img) #pass the imgid here img3 = wx.StaticBitmap(self.panel,imgid,img2) sizer.Add(img3) img3.Bind(wx.EVT_LEFT_DCLICK,self.OnDClick) self.panel.SetSizer(sizer) self.Fit() def OnDClick(self, event): print 'you clicked img%s'%(event.GetId() ) 

You can use dict and match each file name with id, so you will track all this through your program.