Python - Tkinter Checkbutton: checkbutton小部件用于显示切换按钮的用户多项选择。然后，用户可以通过点击相应的按钮每个选项中选择一个或多个选项.
checkbutton小部件用于显示切换按钮的用户多项选择。然后，用户可以通过点击相应的按钮每个选项中选择一个或多个选项.
您还可以显示在图像代替文字.
语法:
这里是一个简单的语法来创建这个widget:
w = Checkbutton ( master, option, ... )
参数:
master: 这表示父窗口.
options: 下面是这个小工具最常用的选项列表。这些选项可以作为键 - 值对以逗号分隔.
| Option | Description |
|---|---|
| activebackground | Background color when the checkbutton is under the cursor. |
| activeforeground | Foreground color when the checkbutton is under the cursor. |
| bg | The normal background color displayed behind the label and indicator. |
| bitmap | To display a monochrome image on a button. |
| bd | The size of the border around the indicator. Default is 2 pixels. |
| command | A procedure to be called every time the user changes the state of this checkbutton. |
| cursor | If you set this option to a cursor name (arrow, dot etc.), the mouse cursor will change to that pattern when it is over the checkbutton. |
| disabledforeground | The foreground color used to render the text of a disabled checkbutton. The default is a stippled version of the default foreground color. |
| font | The font used for the text. |
| fg | The color used to render the text. |
| height | The number of lines of text on the checkbutton. Default is 1. |
| highlightcolor | The color of the focus highlight when the checkbutton has the focus. |
| image | To display a graphic image on the button. |
| justify | If the text contains multiple lines, this option controls how the text is justified: CENTER, LEFT, or RIGHT. |
| offvalue | Normally, a checkbutton's associated control variable will be set to 0 when it is cleared (off). You can supply an alternate value for the off state by setting offvalue to that value. |
| onvalue | Normally, a checkbutton's associated control variable will be set to 1 when it is set (on). You can supply an alternate value for the on state by setting onvalue to that value. |
| padx | How much space to leave to the left and right of the checkbutton and text. Default is 1 pixel. |
| pady | How much space to leave above and below the checkbutton and text. Default is 1 pixel. |
| relief | With the default value, relief=FLAT, the checkbutton does not stand out from its background. You may set this option to any of the other styles |
| selectcolor | The color of the checkbutton when it is set. Default is selectcolor="red". |
| selectimage | If you set this option to an image, that image will appear in the checkbutton when it is set. |
| state | The default is state=NORMAL, but you can use state=DISABLED to gray out the control and make it unresponsive. If the cursor is currently over the checkbutton, the state is ACTIVE. |
| text | The label displayed next to the checkbutton. Use newlines ("\n") to display multiple lines of text. |
| underline | With the default value of -1, none of the characters of the text label are underlined. Set this option to the index of a character in the text (counting from zero) to underline that character. |
| variable | The control variable that tracks the current state of the checkbutton. Normally this variable is an IntVar, and 0 means cleared and 1 means set, but see the offvalue and onvalue options above. |
| width | checkbutton的默认宽度取决于所显示的图像或文字的大小。您可以设置此选项的字符数和checkbutton的，总是有许多字符的空间. |
| wraplength | Normally, lines are not wrapped. You can set this option to a number of characters and all lines will be broken into pieces no longer than that number. |
方法:
以下是这个小工具的常用方法:
| Medthod | Description |
|---|---|
| deselect() | Clears (turns off) the checkbutton. |
| flash() | Flashes the checkbutton a few times between its active and normal colors, but leaves it the way it started. |
| invoke() | You can call this method to get the same actions that would occur if the user clicked on the checkbutton to change its state. |
| select() | Sets (turns on) the checkbutton. |
| toggle() | Clears the checkbutton if set, sets it if cleared. |
例子:
自行尝试下面的例子:
from Tkinter import *
import tkMessageBox
import Tkinter top = Tkinter.Tk()
CheckVar1 = IntVar()
CheckVar2 = IntVar()
C1 = Checkbutton(top, text = "Music", variable = CheckVar1, \
onvalue = 1, offvalue = 0, height=5, \
width = 20)
C2 = Checkbutton(top, text = "Video", variable = CheckVar2, \
onvalue = 1, offvalue = 0, height=5, \
width = 20)
C1.pack()
C2.pack()
top.mainloop()
这将产生以下结果:
