[Tkinter-discuss] How to enable load button in python-tkinter widget

[Michael O'Donnell]

Hi Anil,

  A pure Tkinter dropdown box: click on a button and a menu drops
down, allowing you to select. If you specify a callback function, this is called
when you make a selection:

from Tkinter import *
import os, sys

#  SelecteButton Class - creates a button which when clicked on gives
a popup menu.
# if the callback arg is given, this is a function called when a
selection is made, expecting the
# selected option as arg
# The value can be accessed by asking the widget for its x.selected attribute.
#  Coded Mick O'Donnell michael.odonnell at uam.es

class SelectButton(Label):

    def __init__(self, parent, options, callback=None, default=None,
**otherKeys):
        Label.__init__(self, parent, bg="white", relief="raised",
bd=2, **otherKeys)
        self.options=options
        self.callback=callback
        self.oldGrab=None
        if default==None:  default=self.options[0]
        self.bind("<Button-1>", self.showOptions)
        self.setOption(default, False)

    def setOption(self, selected, docallback=True):
        self.selected=selected
        self["text"]=selected
        if docallback and self.callback:
            self.callback(selected)

    def showOptions(self, event):
        menu=Menu(None, tearoff=0)
        for option in self.options:
            menu.add_command(label=option, command= lambda
lab1=option: self.setOption(lab1))
        menu.post(event.widget.winfo_rootx(), event.widget.winfo_rooty())
        if os.name =="posix" and sys.platform != "darwin":
            menu.grab_set()

# DEMO

if __name__ == '__main__':

    def showSelected(label): print "You selected: ", label

    tk = Tk()
    ssw = SelectButton(tk, ['1','2','3','4','5'],
callback=showSelected, default=str(2))
    ssw.pack(side=TOP, expand=TRUE, fill=BOTH)
    tk.mainloop()