Book Image

Qt5 Python GUI Programming Cookbook

By : B. M. Harwani
Book Image

Qt5 Python GUI Programming Cookbook

By: B. M. Harwani

Overview of this book

PyQt is one of the best cross-platform interface toolkits currently available; it's stable, mature, and completely native. If you want control over all aspects of UI elements, PyQt is what you need. This book will guide you through every concept necessary to create fully functional GUI applications using PyQt, with only a few lines of code. As you expand your GUI using more widgets, you will cover networks, databases, and graphical libraries that greatly enhance its functionality. Next, the book guides you in using Qt Designer to design user interfaces and implementing and testing dialogs, events, the clipboard, and drag and drop functionality to customize your GUI. You will learn a variety of topics, such as look and feel customization, GUI animation, graphics rendering, implementing Google Maps, and more. Lastly, the book takes you through how Qt5 can help you to create cross-platform apps that are compatible with Android and iOS. You will be able to develop functional and appealing software using PyQt through interesting and fun recipes that will expand your knowledge of GUIs

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Table of Contents (20 chapters)
Title Page
Title Page
Dedication
Dedication
Packt Upsell
Packt Upsell
Contributors
Contributors
Preface
Preface
Free Chapter
1
Creating a User Interface with Qt Components
Creating a User Interface with Qt Components
Introduction
Displaying a welcome message
Using the Radio Button widget
Grouping radio buttons
Displaying options in the form of checkboxes
Displaying two groups of checkboxes
2
Event Handling - Signals and Slots
Event Handling - Signals and Slots
Introduction
Using Signal/Slot Editor
Copying and pasting text from one Line Edit widget to another
Converting data types and making a small calculator
Using the Spin Box widget
Using scrollbars and sliders
Using List Widget
Selecting multiple list items from one List Widget and displaying them in another
Adding items into List Widget
Performing operations in List Widget
Using the Combo Box widget
Using the Font Combo Box widget
Using the Progress Bar widget
3
Working with Date and Time
Working with Date and Time
Displaying LCD digits
Displaying system clock time in LCD-like digits
Displaying the date selected by the user from Calendar Widget
Creating a hotel reservation form 
Displaying tabular data using Table Widget
4
Understanding OOP Concepts
Understanding OOP Concepts
Object-oriented programming
Using classes in GUI
Using single inheritance
Using multilevel inheritance
Using multiple inheritance
5
Understanding Dialogs
Understanding Dialogs
Introduction
The input dialog box
Using the input dialog 
Using the color dialog
Using the font dialog
Using the file dialog
6
Understanding Layouts
Understanding Layouts
Understanding layouts
Using Horizontal Layout
Using Vertical Layout
Using Grid Layout
Using Form Layout
7
Networking and Managing Large Documents
Networking and Managing Large Documents
Introduction
Creating a small browser
Creating a server-side application
Establishing client-server communication
Creating a dockable and floatable sign-in form
Multiple Document Interface 
Displaying information in sections using Tab Widget
Creating a custom menu bar
8
Doing Asynchronous Programming in Python
Doing Asynchronous Programming in Python
Introduction
Updating progress bar using thread
Updating two progress bars using two threads
Updating progress bars using threads bound with a locking mechanism
Updating progress bars simultaneously using asynchronous operations
Managing resources using context manager
9
Database Handling
Database Handling
Introduction
Creating a database
Creating a database table
Inserting rows in the specified database table
Displaying rows in the specified database table
Navigating through the rows of the specified database table
Searching a database table for specific information
Creating a signin form – applying an authentication procedure
Updating a database table – changing a user's password 
Deleting a row from a database table
10
Using Graphics
Using Graphics
Introduction
Displaying mouse coordinates
Displaying coordinates where the mouse button is clicked and released
Displaying a point where the mouse button is clicked
Drawing a line between two mouse clicks
Drawing lines of different types
Drawing a circle of a desired size
Drawing a rectangle between two mouse clicks
Drawing text in a desired font and size
Creating a toolbar that shows different graphics tools
Plotting a line using Matplotlib
Plotting a bar using Matplotlib
11
Implementing Animation
Implementing Animation
Introduction
Displaying a 2D graphical image
Making a ball move down on the click of a button
Making a bouncing ball
Making a ball animate as per the specified curve
12
Using Google Maps
Using Google Maps
Introduction
Finding out details of a location or a landmark
Getting complete information from latitude and longitude values
Finding out the distance between two locations
Displaying location on Google Maps 
13
Running Python Scripts on Android and iOS
Running Python Scripts on Android and iOS
Introduction
Copying scripts from PC to Android devices
Prompting for a username and displaying a welcome message
Understanding different buttons in a dialog box
Performing single selection from a list
Performing multiple selections from a list
Displaying a Date Picker dialog
Capturing images using a camera
Making an Android device speak a text input
Creating a cross-platform Python script using Kivy
Packaging a Python Script into the Android APK using Buildozer
Packaging Python script for iOS
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Index
Index

Displaying a 2D graphical image

In this recipe, you will learn to display a 2D graphical image. We assume that you have a graphical image by the name scene.jpg on your machine, and you will learn how it is displayed on the form. The focus of this recipe is to understand how the Graphics View widget is used to display an image.

How to do it...

The procedure for displaying graphics is very simple. You first need to create an object of QGraphicsScene, which in turn makes use of the QGraphicsView class to show its contents. Graphical items, including images, are then added to the QGraphicsScene class by invoking the addItem method of the QGraphicsScene class. Here are the steps to display a 2D graphical image on the screen:

  1. Create a new application based on the Dialog without Buttons template.
  2. Drag and drop a Graphics View widget onto it.
  3. Save the application with the name demoGraphicsView.ui. The form will appear as shown in the following screenshot:

The pyuic5command utility converts the.ui(XML...

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