Recycleview problem with understanding(trying to pass data to a layout in recycleview)

[Big Red Eyes Productions]

I could easily be ignorant of the answer, in fact I claim to be so, but if you can help educate me on what I'm missing, I'll say thank you and offer a gold star.

Here's my kivy:

<ContactCard>:

    name: 'ContactCard'

    usrLst: usrLst

    pswLst: pswLst

    orientation: "vertical"

    BoxLayout:

        orientation: "horizontal"

        Label:

            id: usrLst

            text: "user"

            size_hint_y: None

        Label:

            id: pswLst

            text: "pass"

            size_hint_y: None

        Button:

            text: "Button"

            on_release: print(usrLst.text,'',pswLst.text)

            canvas:

                #Clear

    HSeparator:

<RV>:

    viewclass: 'ContactCard'

    RecycleBoxLayout:

        default_size: None, dp(60)

        default_size_hint: 1, None

        size_hint_y: None

        height: self.minimum_height

        orientation: 'vertical'

Here's the python to go with it:

class ContactCard(BoxLayout):

    usrLst = StringProperty('user')

    pswLst = StringProperty('pass')

    def on_pre_enter(self, *args):

        self.usrLst.text = str(BBApp.search_results[0][0])

        self.pswLst.text = str(BBApp.search_results[0][1])

class RV(RecycleView):

    def __init__(self,**kwargs):

        super().__init__(**kwargs)

        self.data = [{'usrLst': str(x),'pswLst': str(x)}\

             for x in range(12)]

What I'm trying to do is produce a recycle view that provides a boxlayout for its list items.

I'm calling from my sqlite database to match for contacts and trying to pass that data to the labels in the boxlayout.

[Elliot Garbus]

Here is an example of a Recycleview that uses a BoxLayout (TwoButtons) as the viewclass.

 

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.recycleview import RecycleView
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import StringProperty, ListProperty

kv = '''
<TwoButtons>:
# This class is used as the viewclass in the RecycleView
# The means this widget will be instanced to view one element of data from the data list.
# The RecycleView data list is a list of dictionaries.  The keys in the dictionary specify the 
# attributes of the widget.
    Button:
        text: root.left_text
        on_release: print(f'Button {self.text} pressed') 
    Button:
        text: root.right_text
        on_release: print(f'Button {self.text} pressed') 

BoxLayout:
    orientation: 'vertical'
    Button:
        size_hint_y: None
        height: 48
        text: 'Add widget to RV list'
        on_release: rv.add()

    RV:                          # A Reycleview
        id: rv
        viewclass: 'TwoButtons'  # The view class is TwoButtons, defined above.
        data: self.rv_data_list  # the data is a list of dicts defined below in the RV class.
        scroll_type: ['bars', 'content']
        bar_width: 10
        RecycleBoxLayout:        
            # This layout is used to hold the Recycle widgets
            default_size: None, dp(48)   # This sets the height of the BoxLayout that holds a TwoButtons instance.

            default_size_hint: 1, None
            size_hint_y: None

            height: self.minimum_height   # To scroll you need to set the layout height.
            orientation: 'vertical'
'''


class TwoButtons(BoxLayout):  # The viewclass definitions, and property definitions.
    left_text = StringProperty()
    right_text = StringProperty()


class RV(RecycleView):
    rv_data_list = ListProperty()  # A list property is used to hold the data for the recycleview, see the kv code

    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.rv_data_list = [{'left_text': f'Left {i}', 'right_text': f'Right {i}'} for i in range(2)]
        # This list comprehension is used to create the data list for this simple example.
        # The data created looks like:
        # [{'left_text': 'Left 0', 'right_text': 'Right 0'}, {'left_text': 'Left 1', 'right_text': 'Right 1'},
        # {'left_text': 'Left 2', 'right_text': 'Right 2'}, {'left_text': 'Left 3'},...
        # notice the keys in the dictionary correspond to the kivy properties in the TwoButtons class.
        # The data needs to be in this kind of list of dictionary formats.  The RecycleView instances the
        # widgets, and populates them with data from this list.

    def add(self):
        l = len(self.rv_data_list)
        self.rv_data_list.extend(
            [{'left_text': f'Added Left {i}', 'right_text': f'Added Right {i}'} for i in range(l, l + 1)])


class RVTwoApp(App):

    def build(self):
        return Builder.load_string(kv)


RVTwoApp().run()

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[Big Red Eyes Productions]

Wow this is cool, thank you for your time!

I have ran your code and I'm reading the comments a few times to soak it in.

I'm guess that, in order to populate the texts with my search results from my database, I would  do something like the following:

rv .rv_data_list = [{'user_text': f' {i[0]}', 'pass_text': f'{i[1]}'} for i in search_results] (where search results is a tuple  generated by db query.

How can I update the values? Right now it's showing all blank. I want to pass my search results into the rv.data.

[Big Red Eyes Productions]

I am trying to implement the add function you provided, however I'm getting an error.

'kivy.properties.ListProperty' object has no attribute 'extend'

[Big Red Eyes Productions]

A little bit more tinkering and I got it worked out!

def search(self, text):

        self.search_results = self.dbConnect(action="select",\

            id=text, dbChoice=self.dbChoices['users'])

        print("Results: ",self.search_results)      

        print(self.search_results[0][1],self.search_results[0][2])

        RV.data = [

{'usrLst': f'{i[0]}', 'pswLst': f'{i[1]}'}\

    for i in self.search_results]

        return self.search_results

Thanks for helping!

[Elliot Garbus]

Congratulations!  Glad to hear you got it working.

 

From: Big Red Eyes Productions
Sent: Monday, December 5, 2022 11:31 PM
To: Kivy users support

Subject: Re: [kivy-users] Recycleview problem with understanding(trying topassdata to a layout in recycleview)

 

A little bit more tinkering and I got it worked out!

 

def search(self, text):

        self.search_results = self.dbConnect(action="select",\

            id=text, dbChoice=self.dbChoices['users'])

        print("Results: ",self.search_results)      

        print(self.search_results[0][1],self.search_results[0][2])

        RV.data = [

{'usrLst': f'{i[0]}', 'pswLst': f'{i[1]}'}\

    for i in self.search_results]

        return self.search_results

 

 

 

Thanks for helping!

 

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