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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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10
Index

Defining widget events

Now, we will study the events that are called widget-defined events. These kinds of events are inherent to the widget. This recipe will illustrate it with probably the most common widget—the button. We will perform two events: one when the button is pressed and the other when the button state is changed.

Getting ready

In this recipe, it is necessary to clear the difference between the state of the button and press action. Because the states of the button are not pressed and no pressed, they actually are normal and down. The press action changes between both states of the button.

How to do it…

To accomplish the end goal, follow these steps:

  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, define the widget class.
  3. In the widget class, define constructor __init__() within a button.
  4. Bind the callback methods to the button.
  5. Define the...

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