Kivy Tutorial 5

Posted by Derek Banas on Oct 22, 2016 in Web Design | 0 comments

In this part of my Kivy tutorial I cover pretty much every widget I haven’t covered in the last few videos. We’ll explore the Checkbox, Radio Buttons, Switch, Popups, Spinner, Tabbed Panels, Slidder, How to Switch Screens and much more. We also explore how events work with all of these Widgets.

All of the code and a transcript for the video follow the video below.

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Code & Transcript

# ---------- KIVY TUTORIAL PT 5  ----------

# ---------- kivytut.py  ----------

import kivy
kivy.require("1.9.0")

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import ObjectProperty
from kivy.core.window import Window
from kivy.uix.popup import Popup

# Used to display popup
class CustomPopup(Popup):
    pass

class SampBoxLayout(BoxLayout):

    # For checkbox
    checkbox_is_active = ObjectProperty(False)
    def checkbox_18_clicked(self, instance, value):
        if value is True:
            print("Checkbox Checked")
        else:
            print("Checkbox Unchecked")

    # For radio buttons
    blue = ObjectProperty(True)
    red = ObjectProperty(False)
    green = ObjectProperty(False)

    # For Switch
    def switch_on(self, instance, value):
        if value is True:
            print("Switch On")
        else:
            print("Switch Off")

    # Opens Popup when called
    def open_popup(self):
        the_popup = CustomPopup()
        the_popup.open()

    # For Spinner
    def spinner_clicked(self, value):
        print("Spinner Value " + value)


class SampleApp(App):
    def build(self):

        # Set the background color for the window
        Window.clearcolor = (1, 1, 1, 1)
        return SampBoxLayout()

sample_app = SampleApp()
sample_app.run()

# ---------- sample.kv  ----------

#: import CheckBox kivy.uix.checkbox

<CustLabel@Label>:
    color: 0, 0, 0, 1

<CustomPopup>:
    size_hint: .5, .5
    auto_dismiss: False
    title: "The Popup"
    Button:
        text: "Close"
        on_press: root.dismiss()

SampBoxLayout:

<SampBoxLayout>:
    orientation: "vertical"
    padding: 10
    spacing: 10

    # ---------- Holds CheckBox and RadioBox ----------
    BoxLayout:
        orientation: "horizontal"
        height: 30

        BoxLayout:
            orientation: "horizontal"
            size_hint_x: .22
            CustLabel:
                text: "Are you over 18"
                size_hint_x: .80
            CheckBox:
                on_active: root.checkbox_18_clicked(self, self.active)
                size_hint_x: .20
        BoxLayout:
            orientation: "horizontal"
            size_hint_x: .55
            CustLabel:
                text: "Favorite Color"
                color: 0, 0, 0, 1
                size_hint_x: .265
            CheckBox:
                group: "fav_color"
                value: root.blue
                size_hint_x: .05
            CustLabel:
                text: "Blue"
                color: 0, 0, 0, 1
                size_hint_x: .15
            CheckBox:
                group: "fav_color"
                value: root.red
                size_hint_x: .05
            CustLabel:
                text: "Red"
                color: 0, 0, 0, 1
                size_hint_x: .15
            CheckBox:
                group: "fav_color"
                value: root.green
                size_hint_x: .05
            CustLabel:
                text: "Green"
                color: 0, 0, 0, 1
                size_hint_x: .15

    # ---------- Holds Slider & Switch ----------
    BoxLayout:
        orientation: "horizontal"
        height: 30

        BoxLayout:
            orientation: "horizontal"
            size_hint_x: .25
            CustLabel:
                text: str(slider_id.value)

            # Define the min, max, starting value and how
            # much the value changes with each move
            Slider:
                id: slider_id
                min: -100
                max: 100
                value: 0
                step: 1

        BoxLayout:
            orientation: "horizontal"
            size_hint_x: .25
            CustLabel:
                text: "On / Off"

            Switch:
                id: switch_id
                on_active: root.switch_on(self, self.active)

    # ---------- Displays Popup & Spinner ----------
    BoxLayout:
        orientation: "horizontal"
        height: 30

        BoxLayout:
            orientation: "horizontal"
            size_hint_x: .25

            # When clicked the popup opens
            Button:
                text: "Open Popup"
                on_press: root.open_popup()

        BoxLayout:
            orientation: "horizontal"
            size_hint_x: .25

            Spinner:
                text: "First"
                values: ["First", "Second", "Third"]
                id: spinner_id
                on_text: root.spinner_clicked(spinner_id.text)

    # ---------- Displays TabbedPanel ----------
    BoxLayout:
        orientation: "horizontal"
        height: 30

        BoxLayout:
            orientation: "horizontal"
            size_hint_x: .25

            TabbedPanel:
                do_default_tab: False

                TabbedPanelItem:
                    text: "1st Tab"
                    Label:
                        text: "Content of First Panel"
                TabbedPanelItem:
                    text: "2nd Tab"
                    Label:
                        text: "Content of Second Panel"
                TabbedPanelItem:
                    text: "3rd Tab"
                    Label:
                        text: "Content of Third Panel"

# ---------- kivytut2.py  ----------

import kivy
kivy.require('1.9.0')

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen

# You can create your kv code in the Python file
Builder.load_string("""
<ScreenOne>:
    BoxLayout:
        Button:
            text: "Go to Screen 2"
            on_press:
                # You can define the duration of the change
                # and the direction of the slide
                root.manager.transition.direction = 'left'
                root.manager.transition.duration = 1
                root.manager.current = 'screen_two'

<ScreenTwo>:
    BoxLayout:
        Button:
            text: "Go to Screen 1"
            on_press:
                root.manager.transition.direction = 'right'
                root.manager.current = 'screen_one'
""")

# Create a class for all screens in which you can include
# helpful methods specific to that screen
class ScreenOne(Screen):
    pass


class ScreenTwo(Screen):
    pass


# The ScreenManager controls moving between screens
screen_manager = ScreenManager()

# Add the screens to the manager and then supply a name
# that is used to switch screens
screen_manager.add_widget(ScreenOne(name="screen_one"))
screen_manager.add_widget(ScreenTwo(name="screen_two"))

class KivyTut2App(App):

    def build(self):
        return screen_manager

sample_app = KivyTut2App()
sample_app.run()

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# ---------- KIVY TUTORIAL PT 5 ----------

# ---------- kivytut.py ----------

import kivy

kivy.require("1.9.0")

from kivy.app import App

from kivy.uix.boxlayout import BoxLayout

from kivy.properties import ObjectProperty

from kivy.core.window import Window

from kivy.uix.popup import Popup

# Used to display popup

class CustomPopup(Popup):

pass

class SampBoxLayout(BoxLayout):

# For checkbox

checkbox_is_active = ObjectProperty(False)

def checkbox_18_clicked(self, instance, value):

if value is True:

print("Checkbox Checked")

else:

print("Checkbox Unchecked")

# For radio buttons

blue = ObjectProperty(True)

red = ObjectProperty(False)

green = ObjectProperty(False)

# For Switch

def switch_on(self, instance, value):

if value is True:

print("Switch On")

else:

print("Switch Off")

# Opens Popup when called

def open_popup(self):

the_popup = CustomPopup()

the_popup.open()

# For Spinner

def spinner_clicked(self, value):

print("Spinner Value " + value)

class SampleApp(App):

def build(self):

# Set the background color for the window

Window.clearcolor = (1, 1, 1, 1)

return SampBoxLayout()

sample_app = SampleApp()

sample_app.run()

# ---------- sample.kv ----------

#: import CheckBox kivy.uix.checkbox

<CustLabel@Label>:

color: 0, 0, 0, 1

<CustomPopup>:

size_hint: .5, .5

auto_dismiss: False

title: "The Popup"

Button:

text: "Close"

on_press: root.dismiss()

SampBoxLayout:

<SampBoxLayout>:

orientation: "vertical"

padding: 10

spacing: 10

# ---------- Holds CheckBox and RadioBox ----------

BoxLayout:

orientation: "horizontal"

height: 30

BoxLayout:

orientation: "horizontal"

size_hint_x: .22

CustLabel:

text: "Are you over 18"

size_hint_x: .80

CheckBox:

on_active: root.checkbox_18_clicked(self, self.active)

size_hint_x: .20

BoxLayout:

orientation: "horizontal"

size_hint_x: .55

CustLabel:

text: "Favorite Color"

color: 0, 0, 0, 1

size_hint_x: .265

CheckBox:

group: "fav_color"

value: root.blue

size_hint_x: .05

CustLabel:

text: "Blue"

color: 0, 0, 0, 1

size_hint_x: .15

CheckBox:

group: "fav_color"

value: root.red

size_hint_x: .05

CustLabel:

text: "Red"

color: 0, 0, 0, 1

size_hint_x: .15

CheckBox:

group: "fav_color"

value: root.green

size_hint_x: .05

CustLabel:

text: "Green"

color: 0, 0, 0, 1

size_hint_x: .15

# ---------- Holds Slider & Switch ----------

BoxLayout:

orientation: "horizontal"

height: 30

BoxLayout:

orientation: "horizontal"

size_hint_x: .25

CustLabel:

text: str(slider_id.value)

# Define the min, max, starting value and how

# much the value changes with each move

Slider:

id: slider_id

min: -100

max: 100

value: 0

step: 1

BoxLayout:

orientation: "horizontal"

size_hint_x: .25

CustLabel:

text: "On / Off"

Switch:

id: switch_id

on_active: root.switch_on(self, self.active)

# ---------- Displays Popup & Spinner ----------

BoxLayout:

orientation: "horizontal"

height: 30

BoxLayout:

orientation: "horizontal"

size_hint_x: .25

# When clicked the popup opens

Button:

text: "Open Popup"

on_press: root.open_popup()

BoxLayout:

orientation: "horizontal"

size_hint_x: .25

Spinner:

text: "First"

values: ["First", "Second", "Third"]

id: spinner_id

on_text: root.spinner_clicked(spinner_id.text)

# ---------- Displays TabbedPanel ----------

BoxLayout:

orientation: "horizontal"

height: 30

BoxLayout:

orientation: "horizontal"

size_hint_x: .25

TabbedPanel:

do_default_tab: False

TabbedPanelItem:

text: "1st Tab"

Label:

text: "Content of First Panel"

TabbedPanelItem:

text: "2nd Tab"

Label:

text: "Content of Second Panel"

TabbedPanelItem:

text: "3rd Tab"

Label:

text: "Content of Third Panel"

# ---------- kivytut2.py ----------

import kivy

kivy.require('1.9.0')

from kivy.app import App

from kivy.lang import Builder

from kivy.uix.screenmanager import ScreenManager, Screen

# You can create your kv code in the Python file

Builder.load_string("""

<ScreenOne>:

BoxLayout:

Button:

text: "Go to Screen 2"

on_press:

# You can define the duration of the change

# and the direction of the slide

root.manager.transition.direction = 'left'

root.manager.transition.duration = 1

root.manager.current = 'screen_two'

<ScreenTwo>:

BoxLayout:

Button:

text: "Go to Screen 1"

on_press:

root.manager.transition.direction = 'right'

root.manager.current = 'screen_one'

""")

# Create a class for all screens in which you can include

# helpful methods specific to that screen

class ScreenOne(Screen):

pass

class ScreenTwo(Screen):

pass

# The ScreenManager controls moving between screens

screen_manager = ScreenManager()

# Add the screens to the manager and then supply a name

# that is used to switch screens

screen_manager.add_widget(ScreenOne(name="screen_one"))

screen_manager.add_widget(ScreenTwo(name="screen_two"))

class KivyTut2App(App):

def build(self):

return screen_manager

sample_app = KivyTut2App()

sample_app.run()

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Kivy Tutorial 5

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