Button that delete itself

Question

My idea its create a order list. This have to be posible of expand or reduce if the order needed. So I was trying how to do a button that can add a 'Box Label' to a grid, at the same time that this 'Box Label' have the property of delete by itself by a button. I tried a lot of things, but I am really new in this, so nothing work for me.

class OperatorWindow(BoxLayout):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)

    Window.size = (1366, 768)

    def remove_item(self):
        self.ids.parent.clear_widgets()

    def add_more(self):
        prod_addmore = self.ids.product_inputs

        product = BoxLayout(size_hint_x=1, height=30, spacing=5)

        prod = TextInput(size_hint_x=.2)
        qty = TextInput(size_hint_x=.1)
        price = TextInput(size_hint_x=.1)
        delete = Button(text='-', size_hint_x=.05)

        product.add_widget(prod)
        product.add_widget(qty)
        product.add_widget(price)
        product.add_widget(delete)

        prod_addmore.add_widget(product)
        delete.bind(on_release=self.deleting(prod_addmore, product))

    def deleting(self, prod_addmore, product):
        prod_addmore.remove_widget(product)


class OperatorApp(App):
    def build(self):
        return OperatorWindow()


if __name__ == "__main__":
    oa = OperatorApp()
    oa.run()

Kivy File

...
           BoxLayout:
                id: products_labels
                size_hint_y: None
                size_hint_x: .45
                height: 40
                spacing: 5
                
                FlatButton:
                    size_hint_x: .2   
                    text: 'Producto'
                    canvas.before:
                        Color:
                            rgba: (.30,.30,.30,1)
                        Rectangle:
                            size: self.size
                            pos: self.pos
                FlatButton:
                    size_hint_x: .1
                    text: 'Cantidad'
                    canvas.before:
                        Color:
                            rgba: (.30,.30,.30,1)
                        Rectangle:
                            size: self.size
                            pos: self.pos
                FlatButton:
                    size_hint_x: .1
                    text: 'Precio'
                    canvas.before:
                        Color:
                            rgba: (.30,.30,.30,1)
                        Rectangle:
                            size: self.size
                            pos: self.pos


                FlatButton:
                    text: '+'
                    size_hint_x: .05
                    on_release: root.add_more()
                    canvas.before:
                        Color:
                            rgba: (.30,.30,.30,1)
                        Rectangle:
                            size: self.size
                            pos: self.pos

        ScrollView:
            size_hint_y: .15
            do_scroll_x: False
            do_scroll_y: True

            GridLayout:
                id: product_inputs
                size:(self.width, self.height)
                size_hint_x: .45
                spacing: 5
                size_hint_y: None
                cols: 1
                height: self.minimum_height
                row_default_height: 30
                row_force_default: True

Answer 1

Please refer to this link! For some refreshers about widgets.

Your code is fine you just need some minor adjustments here and there.

Firstly change

product 

To

self.product

It always makes it easier to call functions since the self indicates ownership okay.

Secondly change this line

delete.bind(on_release=self.deleting(prod_addmore, product))

to

delete.bind(on_release=self.deleting)

the reason for the error is because of the parenthesis. And lastly

Chang this

def deleting(self, prod_addmore, product): 
     prod_addmore.remove_widget(product) 

to

def deleting(self, widget): 
    prod_addmore = self.ids.product_inputs
    prod_addmore.remove_widget(self.product) 

Hope this helps if you need more indept explano please let me know :)