GUI Graphical user interface programming (XIV) optionmenu - what do you want your girlfriend to wear on Valentine's day

  

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Catalog

Write it at the front

The most basic example

  Application process

Application example

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  Write it at the front

Used in the eighth phase Checkbutton The check button has been used to select the page , Today, let's use a new component .

OptionMenu（ Menu selection ） In fact, it is the revision of the pull-down menu , Its invention makes up for Listbox The component cannot realize the regret of the drop-down list box . 

Creating a selection menu is very simple , Only need it Tkinter Variable （ Used to record what the user selected ） And several options ： 

The most basic example

from tkinter import *

root = Tk()

variable = StringVar()
variable.set("one")

w = OptionMenu(root,variable,"one","two","three")
w.pack()


mainloop()

 

  Application process

1. If you want to create option menu, We need to use OptionMenu Class and pass a variable and a series of option values to the constructor .

from Tkinter import *
 
master = Tk()
 
variable = StringVar(master)
variable.set("one") # default value
 
w = OptionMenu(master, variable, "one", "two", "three")
w.pack()
 
mainloop()

single click one Or the one on the right button, A selection list will pop up , Inside, we passed it to OptionMenu List of options , After we choose any one of them ,button The characters on the left will also change .

2. To get the selected option value , We can use variable get Method .

from Tkinter import *
 
master = Tk()
 
var = StringVar(master)
var.set("one") # initial value
 
option = OptionMenu(master, var, "one", "two", "three", "four")
option.pack()
 
#
# test stuff
 
def ok():
    print "value is", var.get()
    master.quit()
 
button = Button(master, text="OK", command=ok)
button.pack()
 
mainloop()

Application example

from tkinter import *

root = Tk(); root.geometry("300x200")
v = StringVar(root)
v.set(" What do you want your girlfriend to wear most ？")
om = OptionMenu(root, v, " Black silk ", " White silk ", " maid ")

om["width"] = 15
om.pack()


def test1():
    print(" Favorite type :", v.get())


Button(root, text=" determine ", command=test1).pack()

root.mainloop()

  Running results ：

 

 

Background display ：