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📜  Python Tkinter单选按钮

📅  最后修改于: 2020-10-27 01:56:17             🧑  作者: Mango

Python Tkinter单选按钮

Radiobutton小部件用于在Python应用程序中实现多个选择。它向用户显示了多个选择，用户只能从其中选择一个。我们可以将不同的方法与每个单选按钮关联。

我们可以在单选按钮上显示多行文本或图像。为了跟踪用户的选择单选按钮，它与单个变量关联。每个按钮为该特定变量显示一个值。

下面给出了使用单选按钮的语法。

句法

w = Radiobutton(top, options)
SN Option Description
1 activebackground The background color of the widget when it has the focus.
2 activeforeground The font color of the widget text when it has the focus.
3 anchor It represents the exact position of the text within the widget if the widget contains more space than the requirement of the text. The default value is CENTER.
4 bg The background color of the widget.
5 bitmap It is used to display the graphics on the widget. It can be set to any graphical or image object.
6 borderwidth It represents the size of the border.
7 command This option is set to the procedure which must be called every-time when the state of the radiobutton is changed.
8 cursor The mouse pointer is changed to the specified cursor type. It can be set to the arrow, dot, etc.
9 font It represents the font type of the widget text.
10 fg The normal foreground color of the widget text.
11 height The vertical dimension of the widget. It is specified as the number of lines (not pixel).
12 highlightcolor It represents the color of the focus highlight when the widget has the focus.
13 highlightbackground The color of the focus highlight when the widget is not having the focus.
14 image It can be set to an image object if we want to display an image on the radiobutton instead the text.
15 justify It represents the justification of the multi-line text. It can be set to CENTER(default), LEFT, or RIGHT.
16 padx The horizontal padding of the widget.
17 pady The vertical padding of the widget.
18 relief The type of the border. The default value is FLAT.
19 selectcolor The color of the radio button when it is selected.
20 selectimage The image to be displayed on the radiobutton when it is selected.
21 state It represents the state of the radio button. The default state of the Radiobutton is NORMAL. However, we can set this to DISABLED to make the radiobutton unresponsive.
22 text The text to be displayed on the radiobutton.
23 textvariable It is of String type that represents the text displayed by the widget.
24 underline The default value of this option is -1, however, we can set this option to the number of character which is to be underlined.
25 value The value of each radiobutton is assigned to the control variable when it is turned on by the user.
26 variable It is the control variable which is used to keep track of the user’s choices. It is shared among all the radiobuttons.
27 width The horizontal dimension of the widget. It is represented as the number of characters.
28 wraplength We can wrap the text to the number of lines by setting this option to the desired number so that each line contains only that number of characters.

方法

单选按钮小部件提供以下方法。

SN Method Description
1 deselect() It is used to turn of the radiobutton.
2 flash() It is used to flash the radiobutton between its active and normal colors few times.
3 invoke() It is used to call any procedure associated when the state of a Radiobutton is changed.
4 select() It is used to select the radiobutton.

例

from tkinter import *

def selection():
   selection = "You selected the option " + str(radio.get())
   label.config(text = selection)

top = Tk()
top.geometry("300x150")
radio = IntVar()
lbl = Label(text = "Favourite programming language:")
lbl.pack()
R1 = Radiobutton(top, text="C", variable=radio, value=1,
                  command=selection)
R1.pack( anchor = W )

R2 = Radiobutton(top, text="C++", variable=radio, value=2,
                  command=selection)
R2.pack( anchor = W )

R3 = Radiobutton(top, text="Java", variable=radio, value=3,
                  command=selection)
R3.pack( anchor = W)

label = Label(top)
label.pack()
top.mainloop()

输出：