Python - Tkinter Button按钮组件是用来添加一个Python应用程序中的按钮。这些按钮可以显示文字或图像，表达按钮的目的。当你按一下按钮时，您可以附加到一个按钮的函数或方法，该方法自动调用。

按钮组件是用来添加一个Python应用程序中的按钮。这些按钮可以显示文字或图像，表达按钮的目的。当你按一下按钮时，您可以附加到一个按钮的函数或方法，该方法自动调用.

语法:

这里是一个简单的语法来创建这个widget:

w = Button ( master, option=value, ... )

参数:

• master: 这代表了父窗口.

• 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 button is under the cursor.
activeforeground	Foreground color when the button is under the cursor.
bd	Border width in pixels. Default is 2.
bg	Normal background color.
command	Function or method to be called when the button is clicked.
fg	Normal foreground (text) color.
font	Text font to be used for the button's label.
height	Height of the button in text lines (for textual buttons) or pixels (for images).
highlightcolor	The color of the focus highlight when the widget has focus.
image	Image to be displayed on the button (instead of text).
justify	How to show multiple text lines: LEFT to left-justify each line; CENTER to center them; or RIGHT to right-justify.
padx	Additional padding left and right of the text.
pady	Additional padding above and below the text.
relief	Relief specifies the type of the border. Some of the values are SUNKEN, RAISED, GROOVE, and RIDGE.
state	Set this option to DISABLED to gray out the button and make it unresponsive. Has the value ACTIVE when the mouse is over it. Default is NORMAL.
underline	Default is -1, meaning that no character of the text on the button will be underlined. If nonnegative, the corresponding text character will be underlined.
width	Width of the button in letters (if displaying text) or pixels (if displaying an image).
wraplength	If this value is set to a positive number, the text lines will be wrapped to fit within this length.

方法:

以下是这个小工具的常用方法:

Medthod	Description
flash()	Causes the button to flash several times between active and normal colors. Leaves the button in the state it was in originally. Ignored if the button is disabled.
invoke()	Calls the button's callback, and returns what that function returns. Has no effect if the button is disabled or there is no callback.

例子:

自行尝试下面的例子:

import Tkinter

import tkMessageBox

top = Tkinter.Tk()

def helloCallBack():

   tkMessageBox.showinfo( "Hello Python", "Hello World")

B = Tkinter.Button(top, text ="Hello,Python!少壮不努力，老大学编程.-易百在线教程 - www.yiibai.com", command = helloCallBack)

B.pack()

top.mainloop()

这将产生以下结果: