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pythonjsonkivy
Austin Imperial
Austin Imperial

Reputation: 119

How to .put() data in the first item in a JsonStore() in Python Kivy

I'm creating an app which involves a table using Kivy with the module storage. Every time I .put() something in the Json file, I want that certain data to appear just below the headings of the table. Meaning I want the table to show first the most recent data. My code that displays the table is like this:

table.add_widget(Label(text="Heading 1"))
table.add_widget(Label(text="Heading 2"))
table.add_widget(Label(text="Heading 3"))

for item in database:
    data1= database.get(item)['data1']
    data2 = database.get(item)['data2']
    data3 = database.get(item)['data3']

    table.add_widget(Label(text=data1))
    table.add_widget(Label(text=data2))
    table.add_widget(Label(text=data3))

Notes:

My first solution is to reversed() the for-loop but it will not work because database is not a dictionary nor a list because it is a JsonStore().

My second solution is to .put() the data in front of the Json file like this:

{"added_data": {"data1": "info1", "data2": "info2", "data3": "info3"}, "old_data": {"data1": "info1", "data2": "info2", "data3": "info3"}}

but I don't know how to do this.

So... how do you .put() the data in front? or is there any other way to do this?

Upvotes: 0

Views: 919

Answers (1)

Nykakin
Nykakin

Reputation: 8747

add_widget method accepts an index argument which allows you to decide where to put new Widget, so instead to try changing order of data you can just insert new entries in a selected place. An example code:

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout

kv = '''
#:import Label kivy.uix.label.Label

<TestWidget>
    orientation: 'vertical'
    BoxLayout:
        orientation: 'horizontal'
        Button:
            text: 'add before'
            on_press: root.add_widget(Label(text="before"), index=len(root.children))
        Button:
            text: 'add after'
            on_press: root.add_widget(Label(text="after"))
'''
Builder.load_string(kv)

class TestWidget(BoxLayout):
    pass

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

if __name__ == '__main__':
    TestApp().run()

An example with a GridLayout table:

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.gridlayout import GridLayout

kv = '''
#:import Label kivy.uix.label.Label
#:import randint random.randint

<TestWidget>
    cols: 3
    Button:
        text: 'add first'
        on_press: 
            root.add_widget(Label(text=str(randint(0, 10))), index=len(root.children)-3)
            root.add_widget(Label(text=str(randint(0, 10))), index=len(root.children)-3)
            root.add_widget(Label(text=str(randint(0, 10))), index=len(root.children)-3)
    Widget
    Button:
        text: 'add last'
        on_press: 
            root.add_widget(Label(text=str(randint(0, 10))))
            root.add_widget(Label(text=str(randint(0, 10))))
            root.add_widget(Label(text=str(randint(0, 10))))
'''
Builder.load_string(kv)

class TestWidget(GridLayout):
    pass

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

if __name__ == '__main__':
    TestApp().run()

Upvotes: 1

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