Qt5 Python GUI Programming Cookbook

Qt5 Python GUI Programming Cookbook

By : B. M. Harwani

Buy this Book

Qt5 Python GUI Programming Cookbook

By: B. M. Harwani

Buy this Book

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

Title Page

Dedication

Packt Upsell

Contributors

Preface

Free Chapter

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

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

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

Understanding OOP Concepts

Object-oriented programming

Using classes in GUI

Using single inheritance

Using multilevel inheritance

Using multiple inheritance

Understanding Dialogs

Introduction

The input dialog box

Using the input dialog

Using the color dialog

Using the font dialog

Using the file dialog

Understanding Layouts

Understanding layouts

Using Horizontal Layout

Using Vertical Layout

Using Grid Layout

Using Form Layout

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

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

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

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

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

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

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

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Searching a database table for specific information

In this recipe, we will be learning how searching is performed in a database table to fetch the desired information. We assume that a user has forgotten their password. So, you will be prompted to enter the database name, table name, and email address of the user whose password is required. If any user with the email address supplied exists in the database table, then the password of that user will be searched for, accessed, and displayed on the screen.

How to do it…

Follow these steps to find out how data can be searched for in a database table in SQLite:

Let's create an application based on the Dialog without Buttons template.
Add five QLabel widgets, four QLineEdit widgets, and one QPushButton widget to the form by dragging and dropping five Label widgets, four Line Edit widgets, and one Push Button widget on the form.
Set the text property of the first three Label widgets to Enter database name, Enter table name, and Email Address.
Delete...

Qt5 Python GUI Programming Cookbook

By : B. M. Harwani

Qt5 Python GUI Programming Cookbook

By: B. M. Harwani

Overview of this book

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Searching a database table for specific information

How to do it…