Kivy Tutorial – Create a Calculator Application


In this Kivy tutorial, you’ll learn how to create a calculator application, add widgets to your Kivy application, and create a dialog box. You’ll also learn how to combine multiple devices and join them together. Then, you’ll learn how to make each widget do anything you want it to do. Finally, you’ll learn to use the kV and Python code to build your application.

Build a calculator application

Kivy is a graphical Python development tool that can be used on Android, IOS, Linux, and Windows platforms. Its primary use is in mobile app development, but it can also be used to create desktop applications. This tutorial will cover how to use Kivy to build a calculator application.

Kivy has several pre-defined widgets that are used in a Kivy application. Widgets are on-screen controls used to display information on a screen. They are included in most graphical user interface toolkits, and Kivy is no different. To use a Kivy widget, create a subclass of App and override build() to define the UI code. For example, if you are using a Label widget, you’ll need to determine the text, size, and pos_hint.

Kivy provides several features to help you build a calculator application, including a user interface (GUI) and a mobile software version. In addition, it is cross-platform, and GPU accelerated, making it an excellent choice for business and personal projects.

Adding widgets to a kivy application

Kivy supports widgets as its base building block and allows developers to create a variety of UI components. Devices provide a canvas to display data and react to user interactions. Widgets are organized in trees: the root widget is the application, and the children are represented by their children attribute, a Kivy ListProperty. So, for example, if you want to hide a button, you can set the child widget’s parent property to None and remove it from the children’s list.

Widgets are a powerful way to customize your application and enhance its usability. Adding widgets to a Kivy application is as simple as adding a new layer to your UI. Widgets can be made to look and behave like a regular GUI element, and they can display content from anywhere.

You can also add widgets to another widget. This will cause the new device to appear on the screen and allow users to interact with it. Widgets are grouped by their parent widget, the one they are nested in. If you want to display the same device in different locations, you can use the child widget’s size and position to make them appear on other sites on the screen.

Creating a dialog box

If you’re trying to develop a mobile application, you’ll want to learn how to create a dialog box. Dialogs help present users with important information or require decisions. They also make it easier to customize your application for different platforms. The Kivy framework provides several convenient options for creating dialogs.

Adding an image widget

Adding an image widget to Kivy is relatively straightforward. As with any device, you can use a URL for the image’s URL. The image will load from the URL using Kivy AsyncImage. In this example, we’ll use a PNG image to display the image.

Widgets are the basic building blocks of a GUI interface in Kivy. They provide a canvas, receive events, and react to changes. Widgets are organized into trees, with the root widget representing the application and its children represented by the children attribute. The children’s attribute is a Kivy ListProperty. If you remove a widget, the parent property will be set to “None.” This removes the widget from the children’s list.

A widget’s size can be controlled by its size, as well as its position. Its default size is 100 pixels. The size attribute can be changed using the widget’s parent Layout. For example, if you place a device within a Button, it won’t inherit its size, but its position will be the same.

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