Py-Slides-10.ppt Python Programming AIML

18. Python - GUI Programming
(Tkinter)
Python provides various options for developing graphical user interfaces
(GUIs). Most important are listed below:
• Tkinter: Tkinter is the Python interface to the Tk GUI toolkit shipped
with Python. We would look this option in this tutorial.
• wxPython: This is an open-source Python interface for wxWindows
http://wxpython.org.
• JPython: JPython is a Python port for Java, which gives Python scripts
seamless access to Java class libraries on the local machine
http://www.jython.org.

Tkinter Programming:
• Tkinter is the standard GUI library for Python. Python when combined
with Tkinter provides a fast and easy way to create GUI applications.
Tkinter provides a powerful object-oriented interface to the Tk GUI
toolkit.
• Creating a GUI application using Tkinter is an easy task. All you need to
do is perform the following steps:
– Example:Import the Tkinter module.
– Create the GUI application main window.
– Add one or more of the above mentioned widgets to the GUI
application.
– Enter the main event loop to take action against each event
triggered by the user.
import Tkinter
top = Tkinter.Tk()
# Code to add widgets will go here...
top.mainloop()

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:
w = Button ( master, option=value, ... )
Parameters:
– master: This represents the parent window.
– options: Here is the list of most commonly used options for this
widget. These options can be used as key-value pairs separated by
commas.

Example:
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()

Python - Tkinter Canvas
The Canvas is a rectangular area intended for drawing pictures or other
complex layouts. You can place graphics, text, widgets, or frames on a
Canvas.
Syntax:
w = Canvas ( master, option=value, ... )
• Parameters:
commas.

The Canvas widget can support the following standard items:
• arc . Creates an arc item.
coord = 10, 50, 240, 210
arc = canvas.create_arc(coord, start=0, extent=150,
fill="blue")
• image . Creates an image item, which can be an instance of either the
BitmapImage or the PhotoImage classes.
filename = PhotoImage(file = "sunshine.gif")
image = canvas.create_image(50, 50, anchor=NE,
image=filename)
• line . Creates a line item.
line = canvas.create_line(x0, y0, x1, y1, ..., xn, yn,
options)
• oval . Creates a circle or an ellipse at the given coordinates. oval =
canvas.create_oval(x0, y0, x1, y1, options)
• polygon . Creates a polygon item that must have at least three
vertices.
oval = canvas.create_polygon(x0, y0, x1, y1,...xn, yn,
options)

Example:
import Tkinter
import tkMessageBox
top = Tkinter.Tk()
C = Tkinter.Canvas(top, bg="blue", height=250,
width=300)
coord = 10, 50, 240, 210
arc = C.create_arc(coord, start=0, extent=150,
fill="red")
C.pack()
top.mainloop()

Python - Tkinter Checkbutton
The Checkbutton widget is used to display a number of options to a
user as toggle buttons. The user can then select one or more options
by clicking the button corresponding to each option.
You can also display images in place of text.
Syntax:
w = Checkbutton ( master, option, ... )
• Parameters:
commas.

Example:
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()

Python - Tkinter Entry:
• The Entry widget is used to accept single-line text strings from a user.
• If you want to display multiple lines of text that can be edited, then
you should usethe Text widget.
• If you want to display one or more lines of text that cannot be
modified by the user then you should use the Label widget.
Syntax:
Here is the simple syntax to create this widget:
w = Entry( master, option, ... )
Parameters:
commas.

Example:
top = Tk()
L1 = Label(top, text="User Name")
L1.pack( side = LEFT)
E1 = Entry(top, bd =5)
E1.pack(side = RIGHT)
top.mainloop()

Python - Tkinter Frame
• The Frame widget is very important for the process of grouping and
organizing other widgets in a somehow friendly way. It works like a
container, which is responsible for arranging the position of other
widgets.
• It uses rectangular areas in the screen to organize the layout and to
provide padding of these widgets. A frame can also be used as a
foundation class to implement complex widgets.
Syntax:
w = Frame ( master, option, ... )
Parameters:
commas.

Example:
root = Tk()
frame = Frame(root)
frame.pack()
bottomframe = Frame(root)
bottomframe.pack( side = BOTTOM )
redbutton = Button(frame, text="Red", fg="red")
redbutton.pack( side = LEFT)
greenbutton = Button(frame, text="Brown", fg="brown")
greenbutton.pack( side = LEFT )
bluebutton = Button(frame, text="Blue", fg="blue")
bluebutton.pack( side = LEFT )
blackbutton = Button(bottomframe, text="Black",
fg="black")
blackbutton.pack( side = BOTTOM)
root.mainloop()

Python - Tkinter Label
• This widget implements a display box where you can place text or
images. The text displayed by this widget can be updated at any time
you want.
• It is also possible to underline part of the text (like to identify a
keyboard shortcut), and span the text across multiple lines.
Syntax:
w = Label ( master, option, ... )
Parameters:
commas.

Example:
root = Tk()
var = StringVar()
label = Label( root, textvariable=var, relief=RAISED )
var.set("Hey!? How are you doing?")
label.pack()
root.mainloop()

Python - Tkinter Listbox
• The Listbox widget is used to display a list of items from which a user
can select a number of items
Syntax:
• Here is the simple syntax to create this widget:
w = Listbox ( master, option, ... )
Parameters:
commas.

Example:
import tkMessageBox
import Tkinter
top = Tk()
Lb1 = Listbox(top)
Lb1.insert(1, "Python")
Lb1.insert(2, "Perl")
Lb1.insert(3, "C")
Lb1.insert(4, "PHP")
Lb1.insert(5, "JSP")
Lb1.insert(6, "Ruby")
Lb1.pack()
top.mainloop()

Python - Tkinter Menubutton
• A menubutton is the part of a drop-down menu that stays on the
screen all the time. Every menubutton is associated with a Menu
widget that can display the choices for that menubutton when the user
clicks on it.
Syntax:
w = Menubutton ( master, option, ... )
Parameters:
commas.

Example:
import tkMessageBox
import Tkinter
top = Tk()
mb= Menubutton ( top, text="condiments", relief=RAISED )
mb.grid()
mb.menu = Menu ( mb, tearoff = 0 )
mb["menu"] = mb.menu
mayoVar = IntVar()
ketchVar = IntVar()
mb.menu.add_checkbutton ( label="mayo“, variable=mayoVar )
mb.menu.add_checkbutton ( label="ketchup“,
variable=ketchVar )
mb.pack()
top.mainloop()

Python - Tkinter Message
• This widget provides a multiline and noneditable object that displays
texts, automatically breaking lines and justifying their contents.
• Its functionality is very similar to the one provided by the Label widget,
except that it can also automatically wrap the text, maintaining a given
width or aspect ratio.
Syntax:
w = Message ( master, option, ... )
Parameters:
commas.

Example:
root = Tk()
var = StringVar()
label = Message( root, textvariable=var, relief=RAISED )
var.set("Hey!? How are you doing?")
label.pack()
root.mainloop()

Python - Tkinter Radiobutton
• This widget implements a multiple-choice button, which is a way to
offer many possible selections to the user, and let user choose only
one of them.
• In order to implement this functionality, each group of radiobuttons
must be associated to the same variable, and each one of the buttons
must symbolize a single value. You can use the Tab key to switch from
one radionbutton to another.
Syntax:
w = Radiobutton ( master, option, ... )
Parameters:
commas.

Example:
def sel():
selection = "You selected the option " + str(var.get())
label.config(text = selection)
root = Tk()
var = IntVar()
R1 = Radiobutton(root, text="Option 1", variable=var,
value=1, command=sel)
R1.pack( anchor = W )
value=2,command=sel)
R2.pack( anchor = W )
value=3,command=sel)
R3.pack( anchor = W)
label = Label(root)
label.pack()
root.mainloop()

Python - Tkinter Scale
• The Scale widget provides a graphical slider object that allows you to
select values from a specific scale.
Syntax:
w = Scale ( master, option, ... )
Parameters:
commas.

Example:
def sel():
selection = "Value = " + str(var.get())
label.config(text = selection)
root = Tk()
var = DoubleVar()
scale = Scale( root, variable = var )
scale.pack(anchor=CENTER)
button = Button(root, text="Get Scale Value", command=sel)
button.pack(anchor=CENTER)
label = Label(root)
label.pack()
root.mainloop()

Python - Tkinter Scrollbar
• This widget provides a slide controller that is used to implement
vertical scrolled widgets, such as Listbox, Text, and Canvas. Note that
you can also create horizontal scrollbars on Entry widgets.
Syntax:
w = Scrollbar ( master, option, ... )
Parameters:
commas.

Example:
root = Tk()
scrollbar = Scrollbar(root)
scrollbar.pack( side = RIGHT, fill=Y )
mylist = Listbox(root, yscrollcommand = scrollbar.set )
for line in range(100):
mylist.insert(END, "This is line number " + str(line))
mylist.pack( side = LEFT, fill = BOTH )
scrollbar.config( command = mylist.yview )
mainloop()

Python - Tkinter Text
• Text widgets provide advanced capabilities that allow you to edit a
multiline text and format the way it has to be displayed, such as
changing its color and font.
• You can also use elegant structures like tabs and marks to locate
specific sections of the text, and apply changes to those areas.
Moreover, you can embed windows and images in the text because
this widget was designed to handle both plain and formatted text.
Syntax:
w = Text ( master, option, ... )
Parameters:
commas.

Example:
def onclick():
pass
root = Tk()
text = Text(root)
text.insert(INSERT, "Hello.....")
text.insert(END, "Bye Bye.....")
text.pack()
text.tag_add("here", "1.0", "1.4")
text.tag_add("start", "1.8", "1.13")
text.tag_config("here", background="yellow",
foreground="blue")
text.tag_config("start", background="black",
foreground="green")
root.mainloop()

Python - Tkinter Toplevel
• Toplevel widgets work as windows that are directly managed by the
window manager. They do not necessarily have a parent widget on top
of them.
• Your application can use any number of top-level windows.
Syntax:
w = Toplevel ( option, ... )
Parameters:
commas.

Example:
root = Tk()
top = Toplevel()
top.mainloop()

Python - Tkinter Spinbox
• The Spinbox widget is a variant of the standard Tkinter Entry widget,
which can be used to select from a fixed number of values.
Syntax:
w = Spinbox( master, option, ... )
Parameters:
commas.

Example:
master = Tk()
w = Spinbox(master, from_=0, to=10)
w.pack()
mainloop()

Python - Tkinter PanedWindow
• A PanedWindow is a container widget that may contain any number of
panes, arranged horizontally or vertically.
• Each pane contains one widget, and each pair of panes is separated by
a moveable (via mouse movements) sash. Moving a sash causes the
widgets on either side of the sash to be resized.
Syntax:
w = PanedWindow( master, option, ... )
Parameters:
commas.

Example:
m1 = PanedWindow()
m1.pack(fill=BOTH, expand=1)
left = Label(m1, text="left pane")
m1.add(left)
m2 = PanedWindow(m1, orient=VERTICAL)
m1.add(m2)
top = Label(m2, text="top pane")
m2.add(top)
bottom = Label(m2, text="bottom pane")
m2.add(bottom)
mainloop()

Python - Tkinter LabelFrame
• A labelframe is a simple container widget. Its primary purpose is to act
as a spacer or container for complex window layouts.
• This widget has the features of a frame plus the ability to display a
label.
Syntax:
w = LabelFrame( master, option, ... )
Parameters:
commas.

Example:
root = Tk()
labelframe = LabelFrame(root, text="This is a LabelFrame")
labelframe.pack(fill="both", expand="yes")
left = Label(labelframe, text="Inside the LabelFrame")
left.pack()
root.mainloop()

Py-Slides-10.ppt Python Programming AIML

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