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Home > Programming > GUI Application Development > Pyside GUI Application Development- Second Edition
Pyside GUI Application Development- Second Edition
Pyside GUI Application Development- Second Edition

Pyside GUI Application Development- Second Edition: Develop more dynamic and robust GUI applications using PySide, an open source cross-platform UI framework , Second Edition

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Pyside GUI Application Development- Second Edition

Chapter 2. Entering through Windows

The main part of any GUI program is to create windows and define functionalities around it. We will start exploring the ways to create windows and customize it in this chapter, and we will move on to create a real-life windows application in the next chapter.

The widget is the center of the user interface. It receives the user inputs from the mouse, keyboard, and other events of the window system, and paints a representation of itself on the screen. Every widget is rectangular, and sorted in a Z-order. Z-order is an ordering of displayed overlapping windows. The window with a higher Z-order will appear on top of windows with lower Z-orders. A widget is clipped by its parent and by the widgets in front of it. A widget that does not have a parent is called a window and is always independent. Usually, windows have a frame and a title bar at the least, but it is possible to create them without these by setting some windows flags. This chapter explains...

Creating a simple window

The QWidget is the base class for all the user interface classes. A widget can be a top-level widget or a child widget contained in a top-level or parent widget. Now, let's create a top-level window using QWidget. The constructor of the QWidget class takes two optional parameters, parent and flags. The parent parameter can be a QWidget object and the flags parameter can be a combination of PySide.QtCore.Qt.WindowFlags, as follows:

# Import required modules
import sys, time
from PySide.QtGui import *
from PySide.QtCore import *

# Our main window class
class SampleWindow(QWidget):
    # Constructor function
    def __init__(self):
        super(SampleWindow,self).__init__()

        self.initGUI()


    def initGUI(self):
        self.setWindowTitle("Sample Window")
        self.setGeometry(300, 300, 200, 150)
        self.setMinimumHeight(100)
        self.setMinimumWidth(250)
        self.setMaximumHeight(200)
        self.setMaximumWidth(800)
 ...

Creating the application icon

We created our sample window, and now we go on to customize it with some features fitting our needs. For each customization, we add a new function under the SampleWindow class in the previous program to define its properties, and we call this our main function to apply these properties on the sample window. In this section, we define an icon to be set on the window that we created. An icon is a small image that is created to visually emphasize the purpose of the program. It is displayed in the top-left corner of the application window. The same is also displayed in the taskbar when the application is minimized. As a prerequisite for this program, you may need an icon image with dimensions similar to the image that is used here (72 X 72). You can create your own image or download it from the book's website if you wish to use the one used in this program:

# Import required modules
import sys, time
from PySide.QtGui import QApplication, QWidget, QIcon


#...

Showing a tooltip

Our next customization is to show a tooltip for the different modes of icons that are shown. Tooltip is handy when you need to display some help text or information to the users. Displaying help text for the widgets that are used in the window is an integral part for any GUI application. We use the PySide.QtGui.QToolTip class to provide tooltips (also called balloon help) for any widget. The QToolTip class defines the properties of the tooltip, such as font, color, rich text display, and so on. As an example, the font properties can be set as follows:

QToolTip.setFont(QFont("Decorative", 8, QFont.Bold))

After setting the font, we set the tooltip to the widget by calling the setToolTip() function provided by the QWidget class:

   myLabel1.setToolTip('Active Icon')

The QFont class specifies a font that has to be used to draw the text. Using the functions that are provided by this class, we can specify various attributes that we want our font to have. If the...

Adding a button

The next customization is to add a button to our application. The most common button that is used in any GUI is a push or command button. We push (click on) the button to command the computer to perform some action or answer a decision. Typical push buttons include: OK, Apply, Cancel, Close, Yes, No, and Help. Usually the push button is rectangular with some label on it. It can also have an optional icon associated with it. It is also possible to define a shortcut key combination to the button to which it responds on clicking the key combination.

The button emits a signal when it is activated by any external event, such as a mouse click or by pressing the spacebar, or by a keyboard shortcut. A widget may be associated with this key click event, which is executed on receiving this signal, and it is usually called a slot in Qt. We will learn more about signals and slots in the later chapters. As for now, be informed that a signal will connect to a slot on emission. There can...

Centering the window on the screen

The windowed applications based on type and functionality get displayed in the center for main applications, top right for notifications, and as an icon in the status bar of the screen. It is best practice for any main GUI application to display the window centered on the screen. There are two advantages of doing this. The first is to get the attention of the user, and the other is to adjust to different display formats of the various monitor screens.

There is no straightforward method to center the window by calling a predefined function of some class. Therefore, we write our own method, called center, to position the window central to any screen. This method takes the object that it is calling and centers it with respect to the screen that it is displayed on:

    def center(self):
        """ Function to center the application
        """
        qRect = self.frameGeometry()
        centerPoint = QDesktopWidget().availableGeometry...

Creating a simple window

The QWidget is the base class for all the user interface classes. A widget can be a top-level widget or a child widget contained in a top-level or parent widget. Now, let's create a top-level window using QWidget. The constructor of the QWidget class takes two optional parameters, parent and flags. The parent parameter can be a QWidget object and the flags parameter can be a combination of PySide.QtCore.Qt.WindowFlags, as follows:

# Import required modules
import sys, time
from PySide.QtGui import *
from PySide.QtCore import *

# Our main window class
class SampleWindow(QWidget):
    # Constructor function
    def __init__(self):
        super(SampleWindow,self).__init__()

        self.initGUI()


    def initGUI(self):
        self.setWindowTitle("Sample Window")
        self.setGeometry(300, 300, 200, 150)
        self.setMinimumHeight(100)
        self.setMinimumWidth(250)
        self.setMaximumHeight(200)
        self.setMaximumWidth(800)
        self.show(...

Creating the application icon

We created our sample window, and now we go on to customize it with some features fitting our needs. For each customization, we add a new function under the SampleWindow class in the previous program to define its properties, and we call this our main function to apply these properties on the sample window. In this section, we define an icon to be set on the window that we created. An icon is a small image that is created to visually emphasize the purpose of the program. It is displayed in the top-left corner of the application window. The same is also displayed in the taskbar when the application is minimized. As a prerequisite for this program, you may need an icon image with dimensions similar to the image that is used here (72 X 72). You can create your own image or download it from the book's website if you wish to use the one used in this program:

# Import required modules
import sys, time
from PySide.QtGui import QApplication, QWidget, QIcon


# Our main...

Showing a tooltip

Our next customization is to show a tooltip for the different modes of icons that are shown. Tooltip is handy when you need to display some help text or information to the users. Displaying help text for the widgets that are used in the window is an integral part for any GUI application. We use the PySide.QtGui.QToolTip class to provide tooltips (also called balloon help) for any widget. The QToolTip class defines the properties of the tooltip, such as font, color, rich text display, and so on. As an example, the font properties can be set as follows:

QToolTip.setFont(QFont("Decorative", 8, QFont.Bold))

After setting the font, we set the tooltip to the widget by calling the setToolTip() function provided by the QWidget class:

   myLabel1.setToolTip('Active Icon')

The QFont class specifies a font that has to be used to draw the text. Using the functions that are provided by this class, we can specify various attributes that we want our font to have. If the font type that we...

Adding a button

The next customization is to add a button to our application. The most common button that is used in any GUI is a push or command button. We push (click on) the button to command the computer to perform some action or answer a decision. Typical push buttons include: OK, Apply, Cancel, Close, Yes, No, and Help. Usually the push button is rectangular with some label on it. It can also have an optional icon associated with it. It is also possible to define a shortcut key combination to the button to which it responds on clicking the key combination.

The button emits a signal when it is activated by any external event, such as a mouse click or by pressing the spacebar, or by a keyboard shortcut. A widget may be associated with this key click event, which is executed on receiving this signal, and it is usually called a slot in Qt. We will learn more about signals and slots in the later chapters. As for now, be informed that a signal will connect to a slot on emission. There can...

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Key benefits

  • Designed for beginners to help you get started with GUI application development
  • Develop your own applications by creating customized widgets and dialogs
  • Written in a simple and elegant structure so you easily understand how to program various GUI components

Description

Elegantly-built GUI applications are always a massive hit among users. PySide is an open source software project that provides Python bindings for the Qt cross-platform UI framework. Combining the power of Qt and Python, PySide provides easy access to the Qt framework for Python developers and also acts as an excellent rapid application development platform. This book will take you through everything you need to know to develop UI applications. You will learn about installing and building PySide in various major operating systems as well as the basics of GUI programming. The book will then move on to discuss event management, signals and slots, and the widgets and dialogs available with PySide. Database interaction and manipulation is also covered. By the end of this book, you will be able to program GUI applications efficiently and master how to develop your own applications and how to run them across platforms.

Who is this book for?

This book is written for Python programmers who want to learn about GUI programming. It is also suitable for those who are new to Python but are familiar with object-oriented programming.

What you will learn

  • Program GUI applications in an easy and efficient way
  • Download and install PySide, a cross-platform GUI development toolkit for Python
  • Create menus, toolbars, status bars, and child windows
  • Develop a text editor application on your own
  • Connect your GUI to a database and manage it
  • Execute SQL queries by handling databases
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Publication date, Length, Edition, Language, ISBN-13
Publication date : Jan 28, 2016
Length: 144 pages
Edition : 2nd
Language : English
ISBN-13 : 9781785282454
Category :
Programming
Languages :
Python
Concepts :
GUI Application Development
Tools :
PySide

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Product Details

Publication date : Jan 28, 2016
Length: 144 pages
Edition : 2nd
Language : English
ISBN-13 : 9781785282454
Category :
Programming
Languages :
Python
Concepts :
GUI Application Development
Tools :
PySide

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Pyside GUI Application Development- Second Edition
Pyside GUI Application Development- Second Edition
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Python 3 Object-Oriented Programming - Second Edition
Python 3 Object-Oriented Programming - Second Edition
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Python GUI Programming Cookbook
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Table of Contents

7 Chapters
1. Getting Started with PySide Chevron down icon Chevron up icon
1. Getting Started with PySide
Introducing PySide
Hello, GUI
Setting up PySide
Installing PySide using Windows
Installing PySide using Mac OS X
Installing PySide using Linux
Building PySide on Windows
Building PySide on Linux
Building PySide
Importing PySide objects
First PySide application
Exception handling as a practice
Summary
2. Entering through Windows Chevron down icon Chevron up icon
2. Entering through Windows
Creating a simple window
Creating the application icon
Showing a tooltip
Adding a button
Centering the window on the screen
About box
Tracking time using timers
Windows style
Summary
3. Main Windows and Layout Management Chevron down icon Chevron up icon
3. Main Windows and Layout Management
Creating the main window
Status bar
Toolbar
Layout management
SDI and MDI
A simple text editor
Summary
4. Events and Signals Chevron down icon Chevron up icon
4. Events and Signals
Event management
Signals and slots
Drag and drop technique
Drawing shapes
Graphics and effects
Summary
5. Dialogs and Widgets Chevron down icon Chevron up icon
5. Dialogs and Widgets
Built-in dialogs
Custom dialogs
Widgets at a glance
Custom widget
Implementation of MDI
Summary
6. Database Handling Chevron down icon Chevron up icon
6. Database Handling
Connecting to the database
Executing SQL queries
Table and form views
Table view
Form view
Viewing relations in table views
Summary
Index Chevron down icon Chevron up icon
Index

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Customer reviews

Rating distribution
Full star icon Full star icon Half star icon Empty star icon Empty star icon 2.7
(3 Ratings)
5 star 0%
4 star 0%
3 star 66.7%
2 star 33.3%
1 star 0%
Amazon Customer Jan 11, 2019
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
The book is a collection of the code needed to create a basic Qt Gui. Thus the reader learns how to install PySide (on machines with the 3 main operating systems), the basic components of the QT system (such as windows, dialogs, widgets, layouts, events, signals and slots), and how to use PySide to create Gui elements that handle a database.I would prefer to see additional material on other topics such as:* What is Qt and how does PySide enhance or augment Qt* Where Python fits in the overall picture* Difference between PySide and PyQT(4 or 5)* Role or at least mention of an IDE in programming PySide* Role of Qt Designer in the overall scheme of things.But that is perhaps for another book.
Amazon Verified review Amazon
Logan Bender Jun 10, 2016
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
The examples are solid but the explanations seem a bit poor. Perhaps the Authors' non native English is to blame.If you like figuring things out yourself it's fine.If you want good, solid well written explanations and discussion of Pyside, look elsewhere.
Amazon Verified review Amazon
Nicolai Mouritzen Feb 28, 2019
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
I find that better material is available for free on the internet.
Amazon Verified review Amazon

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About the authors

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Profile icon Loganathan
Loganathan
Venkateshwaran Loganathan is an eminent software developer who has been involved in the design, development, and testing of software products for more than five years now. He was introduced to computer programming at an early age of 11 with FoxPro, and he then started to learn and master various computer languages, such as C, C++, Perl, Python, Node.js, and Unix shell scripting. Fascinated by open source development, he has involved himself in contributing to various open source technologies. He is now working for Cognizant Technology Solutions as a technology specialist where he has involved himself in research and development for the Internet of Things domain. He is now actively involved in using RFID devices, Drones, and Google Glass to evolve Future of Technology concepts. Before joining with Cognizant, he worked with few of the IT majors, such as Infosys, Virtusa, and NuVeda. Starting his career as a network developer, he gained expertise in various domains, such as Networking, E-Learning, and HealthCare. He has won various awards and accolades to his merit in the companies he has worked for. Venkateshwaran holds a bachelor's degree in Computer Science and Engineering from Anna University and an M.S in software systems from BITS, Pilani. Apart from programming, he is actively involved in handling various technical and soft skills classes for budding engineers and college students. His hobbies include singing and trekking. He likes to get involved with social servicing and move with people a lot. You can write to him at anandvenkat4@gmail.com.
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Profile icon Jaganmohan
Jaganmohan
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Gopinath Jaganmohan is an Internet of Things evangelist and open source distributed-computing architect. He has 14 years of experience in various industries and has architected and lead implementation in Internet of Things platforms and solutions for enterprise in Telematics, Healthcare, and Wearables. He has worked on various technologies starting from C, Python, Lua, to Node.js, and implemented Big Data technologies like Hbase, Couchbase and ZooKeeper for various clients. He is passionate about device programming and device integration. He is lately working on deep learning technologies like Keras, scikit, Torch7 and Pandas in machine learning for device data.
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Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela