Python Basics
Python Advanced
Python Useful References
Python Useful Resources
Selected Reading
© 2011 TutorialsPoint.COM
|
Python - Tkinter Button
The Button widget is used to add buttons in a Python application. These buttons can display text or images that convey the purpose of the buttons. You can attach a function or a method to a button, which is called automatically when you click the button.
Syntax:
Here is the simple syntax to create this widget:
w = Button ( master, option=value, ... )
|
Parameters:
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. |
Methods:
Following are commonly used methods for this widget:
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. |
Example:
Try following example yourself:
import Tkinter
import tkMessageBox
top = Tkinter.Tk()
def helloCallBack():
tkMessageBox.showinfo( "Hello Python", "Hello World")
B = Tkinter.Button(top, text ="Hello", command = helloCallBack)
B.pack()
top.mainloop()
|
This would produce following result:
|
|
|