CODEWITHSUNDEEP
pythonpython-3.xkivypython-3.6
kerds78
kerds78

Reputation: 121

Setting minimum and maximum value for kivy integer

I have a number that i want to range from 0 to 100, no more and no less. I tried setting the number as:

ego = NumericProperty(0, min=0, max=100)

However, the number still allows itself to go over 100 when I press this button:

on_release: root.update_ego()
Button:
    text: "increase ego"
    pos: 700,500
    on_release: root.update_ego()

And my .py file says this:

def update_ego(self):
    self.ego += 1

Upvotes: 2

Views: 605

Answers (3)

Bobby Hill
Bobby Hill

Reputation: 11

Just as an update, for others that drunkenly stumble in here, you can totally update variables in the kivy button itself.

Button:
    text: "increase ego"
    on_release: root.ego = root.ego + 1

This can cut down the number of functions you have, and save you from unneeded logic hurdles.

Upvotes: 0

ikolim
ikolim

Reputation: 16031

You should do the following:

from kivy.properties import BoundedNumericProperty
...
# returns the boundary value when exceeded
ego = BoundedNumericProperty(0, min=0, max=100,
    errorhandler=lambda x: 100 if x > 100 else 0)

Example - Float Point Decimal

main.py

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import BoundedNumericProperty


class RootWidget(BoxLayout):
    ego = BoundedNumericProperty(0.0, min=0.0, max=2.0,
                                 errorhandler=lambda x: 2.0 if x > 2.0 else 0.0)

    def update_ego(self):
        print('before increment: ego={0:5.2f}'.format(self.ego))
        self.ego += 1.0
        print('after increment: ego={0:5.2f}'.format(self.ego))


class Test2App(App):

    def build(self):
        return RootWidget()


if __name__ == "__main__":
    Test2App().run()

test2.kv

#:kivy 1.10.0

<RootWidget>:
    orientation: "vertical"
    Label:
        font_size: 70
        center_x: root.width / 4
        top: root.top - 50
        text: "{0:5.2f}".format(root.ego)
    Button:
        text: "increase ego"
        on_release: root.update_ego()

Output

enter image description here

Upvotes: 0

Bol
Bol

Reputation: 76

Since I don't know the cause of the problem from this (maybe you have to set the number at another place in the code), I suggest this workaround:

def update_ego(self):
    if self.ego < 100:
        self.ego += 1

Upvotes: 2

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