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Kivy Cookbook

Kivy Cookbook

By : Hugo Solis, Solis
2.5 (2)
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Kivy Cookbook

Kivy Cookbook

2.5 (2)
By: Hugo Solis, Solis

Overview of this book

Kivy is an open-source Python library for rapid development of applications that make use of innovative user interfaces, such as multi-touch apps. It is a promising Python framework to develop UI and UX apps in a cross-platform environment, under the Python philosophy. Kivy Cookbook is a practical book that will guide you through the Kivy framework to develop apps and get your apps ready for distribution in App Store and Android devices. You will start off with installing Kivy and building your interfaces. You will learn how to work the accelerometer and create custom events. Then, you will understand how to use the basics, buttons, labels and text inputs and manipulate the widget tree. Next, you will be able to work with manipulating instructions, create an atlas and layouts. Moving on, you will learn packing for Windows and packing for iOS, and use TestDrive. By the end of the book, you will have learnt in detail the relevant features and tools in Kivy and how to create portable packages to distribute your apps in the most used platforms.
Table of Contents (11 chapters)
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Preface
Preface
What this book covers
What you need for this book
Who this book is for
Sections
Conventions
Reader feedback
Customer support
Free Chapter
1
1. Kivy and the Kv Language
1. Kivy and the Kv Language
Introduction
Installing Kivy
Building your interfaces
Declaring properties within a class
Relating Python code and the Kv language
Referencing widgets
Accessing widgets defined inside the Kv language in your Python code
Reusing styles in multiple widgets
Designing with the Kv language
Running your code
Using Kivy garden
2
2. Input, Motion, and Touch
2. Input, Motion, and Touch
Introduction
Using the mouse
Evolving to the touchscreen
Working with the accelerometer
Using the gyroscope
The differences between the touch and motion events
Recognizing touch shapes
Detecting multitapping
Grabbing touch events
Recording gestures
3
3. Events
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3. Events
Introduction
Scheduling a one-time event
Scheduling a repetitive event
Triggering events
Defining widget events
Creating custom events
Attaching callbacks
Declaring a property
Compounding properties
4
4. Widgets
4. Widgets
Introduction
Using the basics: buttons, labels, and text inputs
Manipulating the widget tree
Traversing the tree
Using swappable widgets
Organizing with layouts
Using FloatLayout
Using BoxLayout
Using GridLayout
Using StackLayout
Using RelativeLayout
Using AnchorLayout
Working with ActionBar
5
5. Graphics – Canvas and Instructions
5. Graphics – Canvas and Instructions
Introduction
Separating with the screen manager
Using drawing instructions
Using context instructions
Working with manipulating instructions
Rotating, translating, and scaling the canvas
Modifying with multitouching
Storing and retrieving the coordinate space context
Introducing animations
6
6. Advanced Graphics – Shaders and Rendering
6. Advanced Graphics – Shaders and Rendering
Introduction
Using Carousel
Creating and using Atlas
Creating layouts
Editing shaders
Creating widgets
Creating your own shader
Rendering in a Framebuffer
Optimizing graphics
7
7. The API in Detail
7. The API in Detail
Introduction
Getting to know the API
Using the asynchronous data loader
Logging objects
Parsing
Applying utils
Leveraging the factory object
Working with audio
Working with video
Working with a camera
Using spelling
Adding effects
Advanced text manipulation
8
8. Packaging our Apps for PC
8. Packaging our Apps for PC
Introduction
Packaging for Windows
Including multimedia for Windows
Running apps in Windows
Packaging for Mac OS
Including multimedia for Mac OS
Running apps in Mac OS
Packaging for Linux
Including multimedia for Linux
Running apps in Linux
9
9. Kivy for Mobile Devices
9. Kivy for Mobile Devices
Introduction
Packaging for iOS
Resizing the screen into iOS
Leveraging mobile features in iOS
Preparing for the App Store
Packaging for Android
Resizing the screen into Android
Leveraging mobile features in Android
10
Index
Index

Triggering events

If we want to schedule the events, we can trigger them, which will help you trigger the same event in different parts of your code. In the next described recipe, the event will be triggered when we double tap.

Getting ready

Again, we are going to make use of the double tap, so it is important that you refer to the recipes in Chapter 2, Input, Motion, and Touch. Even though the skeleton of the code is similar to that for the last event, the actions are completely different. Here the unscheduling will be automatic.

How to do it…

Perform the following steps to achieve the goal:

  1. First, in the KV file, declare an empty label using the following code:
    <MyW>:
    Label:
        id: label1
        pos: 200,200
        text: ''
  2. In the Python code, import the Clock object instance.
  3. In the widget class, define the method my_callback().
  4. Also, define the method on_touch_down() where we will define the trigger.
  5. As shown in the following code, using an if statement, select...

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