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📜  Python Tkinter检查按钮

📅  最后修改于: 2020-10-25 03:52:26             🧑  作者: Mango

Python Tkinter检查按钮

Checkbutton用于跟踪提供给应用程序的用户选择。换句话说，我们可以说Checkbutton用于实现开/关选择。

Checkbutton可以包含文本或图像。 Checkbutton主要用于向用户提供许多选择，其中，用户需要选择一个。它通常实现许多选择中的许多选择。

下面给出了使用复选按钮的语法。

句法

w = checkbutton(master, options)

下面列出了可能的选项。

SN Option Description
1 activebackground It represents the background color when the checkbutton is under the cursor.
2 activeforeground It represents the foreground color of the checkbutton when the checkbutton is under the cursor.
3 bg The background color of the button.
4 bitmap It displays an image (monochrome) on the button.
5 bd The size of the border around the corner.
6 command It is associated with a function to be called when the state of the checkbutton is changed.
7 cursor The mouse pointer will be changed to the cursor name when it is over the checkbutton.
8 disableforeground It is the color which is used to represent the text of a disabled checkbutton.
9 font It represents the font of the checkbutton.
10 fg The foreground color (text color) of the checkbutton.
11 height It represents the height of the checkbutton (number of lines). The default height is 1.
12 highlightcolor The color of the focus highlight when the checkbutton is under focus.
13 image The image used to represent the checkbutton.
14 justify This specifies the justification of the text if the text contains multiple lines.
15 offvalue The associated control variable is set to 0 by default if the button is unchecked. We can change the state of an unchecked variable to some other one.
16 onvalue The associated control variable is set to 1 by default if the button is checked. We can change the state of the checked variable to some other one.
17 padx The horizontal padding of the checkbutton
18 pady The vertical padding of the checkbutton.
19 relief The type of the border of the checkbutton. By default, it is set to FLAT.
20 selectcolor The color of the checkbutton when it is set. By default, it is red.
21 selectimage The image is shown on the checkbutton when it is set.
22 state It represents the state of the checkbutton. By default, it is set to normal. We can change it to DISABLED to make the checkbutton unresponsive. The state of the checkbutton is ACTIVE when it is under focus.
24 underline It represents the index of the character in the text which is to be underlined. The indexing starts with zero in the text.
25 variable It represents the associated variable that tracks the state of the checkbutton.
26 width It represents the width of the checkbutton. It is represented in the number of characters that are represented in the form of texts.
27 wraplength If this option is set to an integer number, the text will be broken into the number of pieces.

方法

下表描述了可以使用“检查按钮”调用的方法。

SN Method Description
1 deselect() It is called to turn off the checkbutton.
2 flash() The checkbutton is flashed between the active and normal colors.
3 invoke() This will invoke the method associated with the checkbutton.
4 select() It is called to turn on the checkbutton.
5 toggle() It is used to toggle between the different Checkbuttons.

例

from tkinter import * 

top = Tk()

top.geometry("200x200")

checkvar1 = IntVar()

checkvar2 = IntVar()

checkvar3 = IntVar()

chkbtn1 = Checkbutton(top, text = "C", variable = checkvar1, onvalue = 1, offvalue = 0, height = 2, width = 10)

chkbtn2 = Checkbutton(top, text = "C++", variable = checkvar2, onvalue = 1, offvalue = 0, height = 2, width = 10)

chkbtn3 = Checkbutton(top, text = "Java", variable = checkvar3, onvalue = 1, offvalue = 0, height = 2, width = 10)

chkbtn1.pack()

chkbtn2.pack()

chkbtn3.pack()

top.mainloop()

输出：