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#options.py
#!/usr/bin/python
# -*- coding: utf-8 -*-
'''
A basic panel with information about foods and prices
There are some foods and drinks. They are distributed in 5 categories:
1. Starters (2 products)
2. Entrées (3 products)
3. Main courses (2 products)
4. Desserts (3 products)
5. Drinks (3 products)
This program shows prices for every element (food or drink) that the waiter/user has chosen.
There is a option in menu bar to quit.
'''
# Modules
from
PyQt4
import
QtGui
,
QtCore
import
random
import
sys
# Global values
foods
=
(
'Beer'
,
'Coke'
,
'Crispy Chicken Wings'
,
'Fish and Chips'
,
'Fruit'
,
'Gazpacho'
,
'Ice cream'
,
'Picarones'
,
'Salmon'
,
'Spaghetti'
,
'Spring rolls'
,
'Vegetarian risotto'
,
'Water'
)
values
=
random
.
sample
(
range
(
10
,
100
),
len
(
foods
))
# Random integers
prices
=
dict
(
zip
(
foods
,
values
))
# Start class
class
Start
(
QtGui
.
QMainWindow
):
def
__init__
(
self
):
super
(
Start
,
self
).
__init__
()
self
.
initUI
()
def
initUI
(
self
):
self
.
mainFrame
=
Options
()
# Create an Options class
self
.
setCentralWidget
(
self
.
mainFrame
)
# This is our main Frame
# Close action
closeAction
=
QtGui
.
QAction
(
'Close'
,
self
)
closeAction
.
triggered
.
connect
(
QtGui
.
qApp
.
quit
)
# Create a menu bar
menubar
=
self
.
menuBar
()
fileMenu
=
menubar
.
addMenu
(
'&File'
)
fileMenu
.
addAction
(
closeAction
)
# Associate Close action to this submenu
self
.
setGeometry
(
200
,
200
,
300
,
200
)
# Size and position
self
.
setWindowTitle
(
'Options'
)
# Windows name
self
.
show
()
# Options class
class
Options
(
QtGui
.
QWidget
):
def
__init__
(
self
):
super
(
Options
,
self
).
__init__
()
# Create a Combo Box
opts
=
QtGui
.
QComboBox
(
self
)
# Add main categories of food + drinks
opts
.
addItem
(
"Starter"
)
opts
.
addItem
(
u"Entrée"
)
# Use a unicode codification (accent is problematic)
opts
.
addItem
(
"Main Course"
)
opts
.
addItem
(
"Dessert"
)
opts
.
addItem
(
"Drinks"
)
# Change buttons (name and enabled) every time user changes category
opts
.
activated
[
str
].
connect
(
self
.
changeButtons
)
# Create buttons
self
.
firstButton
=
QtGui
.
QPushButton
(
'Crispy Chicken Wings'
,
self
)
self
.
secondButton
=
QtGui
.
QPushButton
(
'Gazpacho'
,
self
)
self
.
thirdButton
=
QtGui
.
QPushButton
(
''
,
self
)
# Third button is empty initially
self
.
thirdButton
.
setEnabled
(
False
)
# And it is disabled
# Connect all buttons to onActivated method
self
.
firstButton
.
clicked
.
connect
(
self
.
onActivated
)
self
.
secondButton
.
clicked
.
connect
(
self
.
onActivated
)
self
.
thirdButton
.
clicked
.
connect
(
self
.
onActivated
)
# A text box to show information (Name of product and price)
self
.
infoOption
=
QtGui
.
QTextEdit
(
''
)
# Initial value is empty
self
.
infoOption
.
setStyleSheet
(
"background: transparent"
)
self
.
infoOption
.
setReadOnly
(
True
)
# User cannot change it manually
self
.
infoOption
.
setAlignment
(
QtCore
.
Qt
.
AlignCenter
)
# Create a layout (Grid layout in this example) and put the elements (combobox,
# buttons and text box)
mainLayout
=
QtGui
.
QGridLayout
()
mainLayout
.
addWidget
(
opts
,
0
,
0
)
mainLayout
.
addWidget
(
self
.
firstButton
,
2
,
0
)
mainLayout
.
addWidget
(
self
.
secondButton
,
2
,
1
)
mainLayout
.
addWidget
(
self
.
thirdButton
,
2
,
2
)
mainLayout
.
addWidget
(
self
.
infoOption
,
3
,
0
,
2
,
0
)
self
.
setLayout
(
mainLayout
)
def
onActivated
(
self
):
'''Show a message
Product + its price
'''
product
=
self
.
sender
().
text
()
price
=
self
.
checkPrice
(
product
)
self
.
infoOption
.
setText
(
product
+
'
\n
Price: '
+
str
(
price
))
def
changeButtons
(
self
,
text
):
'''Change button's name and enable/disable them'''
# Text box cleared
self
.
infoOption
.
setText
(
''
)
# Enable all buttons
self
.
firstButton
.
setEnabled
(
True
)
self
.
secondButton
.
setEnabled
(
True
)
self
.
thirdButton
.
setEnabled
(
True
)
# According to every food category show a text in button and disable it
if
text
==
'Starter'
:
self
.
firstButton
.
setText
(
'Crispy Chicken Wings'
)
self
.
secondButton
.
setText
(
'Gazpacho'
)
self
.
thirdButton
.
setText
(
''
)
self
.
thirdButton
.
setEnabled
(
False
)
elif
text
==
u'Entrée'
:
self
.
firstButton
.
setText
(
'Fish and Chips'
)
self
.
secondButton
.
setText
(
'Spaghetti'
)
self
.
thirdButton
.
setText
(
'Spring rolls'
)
# self.thirdButton.setEnabled(True) # It is similar to line before if-conditional
elif
text
==
'Main Course'
:
self
.
firstButton
.
setText
(
'Salmon'
)
self
.
secondButton
.
setText
(
'Vegetarian risotto'
)
self
.
thirdButton
.
setText
(
''
)
self
.
thirdButton
.
setEnabled
(
False
)
elif
text
==
'Dessert'
:
self
.
firstButton
.
setText
(
'Fruit'
)
self
.
secondButton
.
setText
(
'Ice cream'
)
self
.
thirdButton
.
setText
(
'Picarones'
)
# self.thirdButton.setEnabled(True) # It is similar to line before if-conditional
elif
text
==
'Drinks'
:
self
.
firstButton
.
setText
(
'Beer'
)
self
.
secondButton
.
setText
(
'Coke'
)
self
.
thirdButton
.
setText
(
'Water'
)
# self.thirdButton.setEnabled(True) # It is similar to line before if-conditional
# This is a default case (in this example is not possible to reach it)
else
:
# All buttons are empty
self
.
firstButton
.
setText
(
''
)
self
.
secondButton
.
setText
(
''
)
self
.
thirdButton
.
setText
(
''
)
# All buttons are disabled
self
.
firstButton
.
setEnabled
(
False
)
self
.
secondButton
.
setEnabled
(
False
)
self
.
thirdButton
.
setEnabled
(
False
)
def
checkPrice
(
self
,
text
):
'''Check the global variable prices
Return a numeric value (according to the variable prices). In this example is an integer
'''
global
prices
return
prices
[
str
(
text
)]
# Main class
def
main
():
app
=
QtGui
.
QApplication
(
sys
.
argv
)
ex
=
Start
()
sys
.
exit
(
app
.
exec_
())
### Main ###
if
__name__
==
'__main__'
:
main
()
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