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How to use recycleview in Kivy

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by aryaman@openweaver.com dot icon Updated: Sep 19, 2023

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Kivy is a Python framework. It is open-source and helps develop applications with creative user interfaces quickly. Developers use it to create applications that function on various devices.  

   

Kivy finds its application in a diverse range of scenarios. It serves as an ideal platform for developing not only mobile apps but also web applications. This flexibility enables developers to target different platforms without rewriting the codebase.  

   

Kivy encompasses a range of modules catering to different application development aspects. These modules include those related to graphics, networking, and user interface elements. By leveraging these modules, developers can quickly build rich and interactive applications.  

   

Various means make it possible to integrate Kivy with other applications. The review module helps add web content to Kivy apps. Connecting to external services improves the app's functionality.  

   

When working with Kivy, there are strategies to enhance the user interface. To keep the app consistent, use templates. For specific design elements, make custom widgets. Optimizing Kivy applications for performance involves employing effective strategies. Caching can make the app respond faster, and optimizing code makes it work better for users.  

   

When talking about Kivy, it's important to mention its standout features. It can work on different platforms and has versatility and user interface capabilities. Discussing Kivy's compatibility with other technologies helps us grasp its abilities.  

   

Kivy is a free platform that helps developers make apps for any device. This software is a good option for various projects. It can adjust, has many modules, and is easy to use. Kivy helps bring your innovative ideas to life, whether a mobile app or a web application.  

CODE

RecycleView Module in Kivy

PythondotLines of Code : 86dotLicense : Strong Copyleft (CC BY-SA 4.0)

Dependent Libraries : 
from kivy.app import App
from kivy.graphics import Color, Rectangle
from kivy.uix.recycleview import RecycleView
from kivy.uix.recycleview.views import RecycleDataViewBehavior
from kivy.uix.label import Label
from kivy.properties import BooleanProperty
from kivy.uix.recycleboxlayout import RecycleBoxLayout
from kivy.uix.behaviors import FocusBehavior
from kivy.uix.recycleview.layout import LayoutSelectionBehavior

class SelectableRecycleBoxLayout(FocusBehavior, LayoutSelectionBehavior,
                                 RecycleBoxLayout):
    ''' Adds selection and focus behaviour to the view. '''
    def __init__(self, **kw):
        super().__init__(**kw, default_size=(0, 28), default_size_hint=(1, None), size_hint_y=None,
                         touch_multiselect=True, multiselect=True, orientation='vertical')

        self.bind(minimum_height=self._min)

    def _min(self, inst, val):
        self.height = val

class SelectableLabel(RecycleDataViewBehavior, Label):
    ''' Add selection support to the Label '''
    index = None
    selected = BooleanProperty(False)
    selectable = BooleanProperty(True)

    def __init__(self, **kw):
        super().__init__(**kw)
        self.canvas.before.clear()
        with self.canvas.before:
            if self.selected:
                Color(.0, 0.9, .1, .3)
            else:
                Color(0, 0, 0, 1)
            self.rect = Rectangle(size=self.size, pos=self.pos)
        self.bind(size=self._update_rect, pos=self._update_rect)

    def _update_rect(self, inst, value):
        self.rect.pos = inst.pos
        self.rect.size = inst.size

    def refresh_view_attrs(self, rv, index, data):
        ''' Catch and handle the view changes '''
        self.index = index
        return super().refresh_view_attrs(rv, index, data)

    def on_touch_down(self, touch):
        ''' Add selection on touch down '''
        if super(SelectableLabel, self).on_touch_down(touch):
            return True
        if self.collide_point(*touch.pos) and self.selectable:
            return self.parent.select_with_touch(self.index, touch)

    def apply_selection(self, rv, index, is_selected):
        ''' Respond to the selection of items in the view. '''
        self.selected = is_selected
        if is_selected:
            print("selection changed to {0}".format(rv.data[index]))
        else:
            print("selection removed for {0}".format(rv.data[index]))
        self.canvas.before.clear()
        with self.canvas.before:
            if self.selected:
                Color(.0, 0.9, .1, .3)
            else:
                Color(0, 0, 0, 1)
            self.rect = Rectangle(size=self.size, pos=self.pos)


class RV(RecycleView):
    def __init__(self, **kwargs):
        super(RV, self).__init__(**kwargs)
        self.add_widget(SelectableRecycleBoxLayout())
        self.viewclass = 'SelectableLabel'
        self.data = [{'text': str(x)} for x in range(100)]


class TestApp(App):
    def build(self):
        return RV()

if __name__ == '__main__':
    TestApp().run()
  1. Copy the code using the "Copy" button above, and paste it into a Python file in your IDE.
  2. Modify the code appropriately.
  3. Run the file to check the output.


I hope you found this helpful. I have added the link to dependent libraries and version information in the following sections.

Dependent Libraries

kivyby kivy

Python doticonstar image 15962 doticonVersion:2.2.0doticon
License: Permissive (MIT)

Open source UI framework written in Python, running on Windows, Linux, macOS, Android and iOS

Support
    Quality
      Security
        License
          Reuse

            kivyby kivy

            Python doticon star image 15962 doticonVersion:2.2.0doticon License: Permissive (MIT)

            Open source UI framework written in Python, running on Windows, Linux, macOS, Android and iOS
            Support
              Quality
                Security
                  License
                    Reuse

                      Environment Tested

                      I tested this solution in the following versions. Be mindful of changes when working with other versions.

                      1. The solution is created in Python3.11..

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                      FAQ 

                      1. How can developers use the Kivy module for mobile app development?  

                      The Kivy module is a key part of the Kivy framework. It helps create GUIs and user experiences for apps. Python makes Kivy. It helps developers create interactive mobile apps. It provides many tools, widgets, and functionalities that simplify developing mobile apps. Kivy's features can help developers make attractive and easy-to-use interfaces for mobile apps.  

                         

                      2. What are recycle views, and how do they help create a user interface with custom widgets?  

                      In Kivy, recycling views are a great way to show lots of data in a UI. Instead of making new widgets for every item, recycle views use a few widget instances. The views update their content as the user scrolls. This approach conserves memory and enhances performance. Developers can create special interfaces by combining recycle views and custom widgets. These interfaces can adjust to various data inputs and offer smooth scrolling.  

                         

                      3. How does a layout manager help in designing an intuitive user interface?  

                      Layout managers in Kivy help organize and arrange widgets in a user interface. They ensure widgets are in the right place and size for different screens. In Kivy, the "RelativeLayout" allows developers to connect widgets and position them dynamically. This method helps you use interfaces that change for different devices and orientations.  

                         

                      4. Can you provide an application example that uses Kivy RecycleView?  

                      Consider an application designed to display a list of items, such as a to-do list. To efficiently handle many items in a scrollable list, the app can use a Kivy RecycleView. Each item in the list corresponds to a custom widget that presents the item's content. The RecycleView reuses and updates custom widgets while the user scrolls. This ensures smooth scrolling and saves memory.  

                         

                      5. What is the purpose of viewclass when using Kivy RecycleView?  

                      The view class attribute in Kivy RecycleView chooses the widget's class to show each item. Developers can decide how things in the RecycleView look and where to put them. Developers can modify the view class to display data items the way they want. They can change how the items look and act. The creators designed this user interface for personalization and seamless integration.  

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