[ACCEPTED]-Best way to get the name of a button that called an event?-wxpython

Accepted answer
Score: 12

You could give the button a name, and then 2 look at the name in the event handler.

When 1 you make the button

b = wx.Button(self, 10, "Default Button", (20, 20))
b.myname = "default button"
self.Bind(wx.EVT_BUTTON, self.OnClick, b)

When the button is clicked:

def OnClick(self, event):
    name = event.GetEventObject().myname
Score: 8

Take advantage of what you can do in a language 4 like Python. You can pass extra arguments 3 to your event callback function, like so.

import functools

def __init__(self):
    # ...
    for i in range(10):
        name = 'Button %d' % i
        button = wx.Button(parent, -1, name)
        func = functools.partial(self.on_button, name=name)
        button.Bind(wx.EVT_BUTTON, func)
    # ...

def on_button(self, event, name):
    print '%s clicked' % name

Of 2 course, the arguments can be anything you 1 want.

Score: 7

I recommend that you use different event 4 handlers to handle events from each button. If 3 there is a lot of commonality, you can combine 2 that into a function which returns a function with 1 the specific behavior you want, for instance:

def goingTo(self, where):
    def goingToHandler(event):
        self.SetTitle("I'm going to " + where)
    return goingToHandler

def __init__(self):
    buttonA.Bind(wx.EVT_BUTTON, self.goingTo("work"))
    # clicking will say "I'm going to work"
    buttonB.Bind(wx.EVT_BUTTON, self.goingTo("home"))
    # clicking will say "I'm going to home"
Score: 3

Keep a dict with keys that are the .Id of the buttons 7 and values that are the button names or 6 whatever, so instead of a long if/elif chain you 5 do a single dict lookup in buttonClick.

Code snippets: in 4 __init__, add creation and update of the dict:

self.panel1 = wx.Panel(self, -1)
self.thebuttons = dict()

self.button1 = wx.Button(self.panel1, id=-1,
    pos=(10, 20), size = (20,20))
self.thebuttons[self.button1.Id] = 'Button 1'
self.button1.Bind(wx.EVT_BUTTON, self.buttonClick)

and so 3 on for 50 buttons (or whatever) [they might 2 be better created in a loop, btw;-)]. So 1 buttonClick becomes:

   def buttonClick(self,event):
       button_name = self.thebuttons.get(event.Id, '?No button?')
       self.setTitle(button_name + ' clicked')
Score: 2

You could create a dictionary of buttons, and 2 do the look based on the id ... something 1 like this:

class MyFrame(wx.Frame):
   def _add_button (self, *args):
      btn = wx.Button (*args)
      btn.Bind (wx.EVT_BUTTON, self.buttonClick)
      self.buttons[btn.id] = btn
   def __init__ (self):
      self.button = dict ()
      self._add_button (self.panel1, id=-1,
        pos=(10, 20), size = (20,20))

    self._add_button = (self.panel1, id=-1,
        pos=(40, 20), size = (20,20))

    self.Show (True)

   def buttonClick(self,event):
      self.SetTitle (self.buttons[event.Id].label)
Score: 0

I ran into a similar problem: I was generating 13 buttons based on user-supplied data, and 12 I needed the buttons to affect another class, so 11 I needed to pass along information about 10 the buttonclick. What I did was explicitly 9 assign button IDs to each button I generated, then 8 stored information about them in a dictionary 7 to lookup later.

I would have thought there 6 would be a prettier way to do this, constructing 5 a custom event passing along more information, but 4 all I've seen is the dictionary-lookup method. Also, I 3 keep around a list of the buttons so I can 2 erase all of them when needed.

Here's a slightly 1 scrubbed code sample of something similar:

self.buttonDefs = {}
self.buttons = []
id_increment = 800
if (row, col) in self.items:
    for ev in self.items[(row, col)]:
        id_increment += 1
        #### Populate a dict with the event information
        self.buttonDefs[id_increment ] = (row, col, ev['user'])
        tempBtn = wx.Button(self.sidebar, id_increment , "Choose",
                            (0,50+len(self.buttons)*40), (50,20) )
        self.sidebar.Bind(wx.EVT_BUTTON, self.OnShiftClick, tempBtn)

def OnShiftClick(self, evt):
    ### Lookup the information from the dict
    row, col, user = self.buttonDefs[evt.GetId()]
    self.WriteToCell(row, col, user)
    self.DrawShiftPicker(row, col)
Score: 0

I needed to do the same thing to keep track 6 of button-presses . I used a lambda function 5 to bind to the event . That way I could 4 pass in the entire button object to the 3 event handler function to manipulate accordingly.

    class PlatGridderTop(wx.Frame):
        numbuttons = 0
        buttonlist = []

        def create_another_button(self, event): # wxGlade: PlateGridderTop.<event_handler>
                buttoncreator_id = wx.ID_ANY
                butonname = "button" + str(buttoncreator_id)
                PlateGridderTop.numbuttons = PlateGridderTop.numbuttons + 1
                thisbutton_number = PlateGridderTop.numbuttons

                self.buttonname  =  wx.Button(self,buttoncreator_id ,"ChildButton %s" % thisbutton_number )
                self.Bind(wx.EVT_BUTTON,lambda event, buttonpressed=self.buttonname: self.print_button_press(event,buttonpressed),self.buttonname)
                print "Clicked plate button %s" % butonname
       def print_button_press(self,event,clickerbutton):
               """Just a dummy method that responds to a button press"""
               print "Clicked a created button named %s with wxpython ID %s" % (clickerbutton.GetLabel(),event.GetId())

Disclaimer 2 : This is my first post to stackoverflow 1

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