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Step 1. Import required packages.
For this, we will need Builder, Factory from kivy, and MDApp from kivymd package.
Note: We will not be importing kivy widgets/ kivy classes because we are designing our layout using kv language.
Python3
# importing packages from kivy.lang import Builder from kivy.factory import Factory from kivymd.app import MDApp |
Step 2. Design layout.
We will be designing our layout using kv language.
- First, we will declare the Screen widget class called Screen and then the child widget class. Here MDBanner, MDToolbar, and MDBoxLayout is a child class, and OneLineListItem and widget are a Sub-child classes of MDBoxLayout.
- We will pass the id, text, over_widget, and vertical_pad parameters to MDBanner. The id parameter is completely optional here but we use it to give it a unique identity. The over_widget and vertical_pad are used for alignment on-screen, over_widget sets the Banner on the screen and vertical_pad sets padding vertically on the screen. The text parameter is the text output on the MDBanner.
- We will pass title, id, elevation, and pos_hint parameters in MDToolbar. Where the title works as text, elevation is used to align MDToolbar on the top of the screen, and pos_hint is used to specify its location on the screen.
- In MDBoxLayout we will be using id, orientation, size_hint_y, height. Where we will be keeping our orientation vertical, size_hint_y is used to specify height according to the y-axis, and we will use the height parameter to get a proper BoxLayout when MDBanner is dropped(in simple we need to change BoxLayout height when MDBanner is dropped).
- We will also be using the widget and OneLineListItem where the widget will be empty and we will pass text and on_release. On_release is an event here, so when the event will be triggered it will show the banner.
Python3
# importing packages from kivy.lang import Builder from kivy.factory import Factory from kivymd.app import MDApp # it will load the kv # Note: we need not to import MDBanner # or anything if working with kv Builder.load_string( ''' <Banner@Screen> # this will create a banner MDBanner: id: banner text: ["GEEKS FOR GEEKS."] # defining size to banner over_widget: screen vertical_pad: toolbar.height # this will create a toolbar MDToolbar: id: toolbar title: "Example Banners" elevation: 10 pos_hint: {'top': 1} # this will create a vertical box layout MDBoxLayout: id: screen orientation: "vertical" size_hint_y: None height: Window.height - toolbar.height # it will trigger banner to show OneLineListItem: text: "CLICK HERE" on_release: banner.show() # we will keep widget because we want to align OneLineListItem at the top # or it will float at the bottom by default Widget: ''' ) # App class class Test(MDApp): def build( self ): # Factory.banner is our kv lang we wrote # which was loader by builder.load_string() # and stored in Factory return Factory.Banner() # running app Test().run() |
Implementation of code:
Python3
# importing packages from kivy.lang import Builder from kivy.factory import Factory from kivymd.app import MDApp # it will load the kv # Note: we need not to import MDBanner # or anything if working with kv Builder.load_string( ''' <Banner@Screen> # this will create a banner MDBanner: id: banner text: ["GEEKS FOR GEEKS."] # defining size to banner over_widget: screen vertical_pad: toolbar.height # this will create a toolbar MDToolbar: id: toolbar title: "Example Banners" elevation: 10 pos_hint: {'top': 1} # this will create a vertical box layout MDBoxLayout: id: screen orientation: "vertical" size_hint_y: None height: Window.height - toolbar.height # it will trigger banner to show OneLineListItem: text: "CLICK HERE" on_release: banner.show() #we don't need widgets so we will leave widget empty #or you can simply remove it Widget: ''' ) # App class class Test(MDApp): def build( self ): # Factory.banner is our kv lang we wrote # which was loader by builder.load_string() # and stored in Factory return Factory.Banner() # running app Test().run() |
Output:
How to Create banner in kivymd-Python?
In this article, we will see how to add the banner to our application using KivyMD in Python.
A banner is a dropdown item when a button or action is triggered. Banners are widely used for pop-ups and warnings in mobile applications. You might need a basic understanding of kv lang to get started.
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