Kivy Tutorial 2

Posted by Derek Banas on Oct 8, 2016 in Web Design | 0 comments

In part 2 of my Kivy tutorial series we’ll explore much of what we need to know before we start making apps in the next video. We’ll cover creating custom widgets, setting default attributes, and 6 layouts being : Absolute Positioning, Floating Layout, Grid Layout, Box Layout, Stack Layout, and Page Layout.

All of the code from the video follows the video below. We’ll start making apps next time.

If you enjoy videos like this consider donating $1 on Patreon.

Code & Transcript from the Video

# ---------- KIVYTUT.PY ----------

# It is common practice to create your own custom
# widgets so base widgets aren't effected

import kivy
kivy.require('1.9.0')

from kivy.app import App
from kivy.uix.widget import Widget

class CustomWidget(Widget):
    pass

class CustomWidgetApp(App):

    def build(self):
        return CustomWidget()

customWidget = CustomWidgetApp()

customWidget.run()

# ---------- CUSTOMWIDGET.KV ----------

# You can set default attributes that are shared by
# other widgets

# color is RGBA as a percent of 255 and alpha
# Color is the text color
# background_normal and background_down are either
# white with '' or can be set to a png
# background_color tints whatever the background is

<CustButton@Button>:
    font_size: 32
    color: 0, 0, 0, 1
    size: 150, 50
    background_normal: ''
    background_down: 'bkgrd-down-color.png'
    background_color: .88, .88, .88, 1

# Position is x and y from the bottom left hand corner
# You can define the position based on the changing
# window sizes with root.x being the left most side
# and root.y being the bottom
<CustomWidget>:
    CustButton:
        text: "Random"
        pos: root.x, 200
    CustButton:
        text: "Buttons"
        pos: 200, root.y
    CustButton:
        text: "Buttons"
        pos: 200, 400

# ---------- KIVYTUT2.PY ----------

import kivy
kivy.require('1.9.0')

from kivy.app import App
from kivy.uix.floatlayout import FloatLayout

# A Float layout positions and sizes objects as a percentage
# of the window size

class FloatingApp(App):

    def build(self):
        return FloatLayout()

flApp = FloatingApp()

flApp.run()

# ---------- FLOATING.KV ----------

# size_hint defines the widget width (0-1) representing
# a percentage of 100% and height of the window
<CustButton@Button>:
    font_size: 32
    color: 0, 0, 0, 1
    size: 150, 50
    background_normal: ''
    background_down: 'bkgrd-down-color.png'
    background_color: .88, .88, .88, 1
    size_hint: .4, .3

# pos_hint represents the position using either x, y, left,
# right, top, bottom, center_x, or center_y
<FloatLayout>:
    CustButton:
        text: "Top Left"
        pos_hint: {"x": 0, "top": 1}
    CustButton:
        text: "Bottom Right"
        pos_hint: {"right": 1, "y": 0}
    CustButton:
        text: "Top Right"
        pos_hint: {"right": 1, "top": 1}
    CustButton:
        text: "Bottom Left"
        pos_hint: {"left": 1, "bottom": 0}
    CustButton:
        text: "Center"
        pos_hint: {"center_x": .5, "center_y": .5}


# ---------- KIVYTUT3.PY ----------

import kivy
kivy.require('1.9.0')

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

# The Grid Layout organizes everything in a grid pattern

class GridLayoutApp(App):

    def build(self):
        return GridLayout()

glApp = GridLayoutApp()

glApp.run()

# ---------- GRIDLAYOUT.KV ----------

# Define the number of columns and rows
# Define the spacing between children in pixels

<GridLayout>:
    cols: 2
    rows: 2
    spacing: 10

    # Set the size by passing None to size_hint_x
    # and then pass the width

    Button:
        text: "1st"
        size_hint_x: None
        width: 200
    Button:
        text: "2nd"
    Button:
        text: "3rd"
        size_hint_x: None
        width: 200
    Button:
        text: "4th"

# ---------- KIVYTUT4.PY ----------

import kivy
kivy.require('1.9.0')

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

# With a box layout we arrange widgets in a horizontal
# or vertical box

class BoxLayoutApp(App):

    def build(self):
        return BoxLayout()

blApp = BoxLayoutApp()

blApp.run()

# ---------- BOXLAYOUT.KV ----------

# Orientation defines whether widgets are stacked (vertical)
# or are placed side by side (horizontal)
# padding is the space between the widgets and the
# surrounding window
<BoxLayout>:
    orientation: "vertical"
    spacing: 10
    padding: 10

    # size_hint defines the percentage of space taken on the
    # x access and the percentage of space left over by the
    # other widgets
    Button:
        text: "1st"
        size_hint: .7, .5

    Button:
        text: "2nd"

    Button:
        text: "3rd"

# ---------- KIVYTUT5.PY ----------

import kivy
kivy.require('1.9.0')

from kivy.app import App
from kivy.uix.stacklayout import StackLayout

# A stack layout arranges widgets vertically or horizontally
# as they best fit

class StackLayoutApp(App):

    def build(self):
        return StackLayout()

slApp = StackLayoutApp()

slApp.run()

# ---------- STACKLAYOUT.KV ----------

# orientation is lr-tb or left to right, top to bottom
# Other options are tb-lr, rl-tb, tb-rl, lr-bt, bt-lr,
# rl-bt, bt-rl
<StackLayout>:
    orientation: "lr-tb"
    spacing: 10
    padding: 10

    # size_hint defines the percentage of space taken on the
    # x access and the percentage of space left over by the
    # other widgets
    Button:
        text: "Q"
        size_hint: None, .15
        width: 100
    Button:
        text: "W"
        size_hint: None, .15
        width: 120
    Button:
        text: "E"
        size_hint: None, .15
        width: 140
    Button:
        text: "R"
        size_hint: None, .15
        width: 160
    Button:
        text: "T"
        size_hint: None, .15
        width: 180
    Button:
        text: "Y"
        size_hint: None, .15
        width: 200

# ---------- KIVYTUT6.PY ----------

import kivy
kivy.require('1.9.0')

from kivy.app import App
from kivy.uix.pagelayout import PageLayout

# A page layout is used to create multi-page layouts
# that you can flip through

class PageLayoutApp(App):

    def build(self):
        return PageLayout()

plApp = PageLayoutApp()

plApp.run()

# ---------- PAGELAYOUT.KV ----------

<PageLayout>:
    Button:
        text: "Page 1"
    Button:
        text: "Page 2"
    Button:
        text: "Page 3"

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# ---------- KIVYTUT.PY ----------

# It is common practice to create your own custom

# widgets so base widgets aren't effected

import kivy

kivy.require('1.9.0')

from kivy.app import App

from kivy.uix.widget import Widget

class CustomWidget(Widget):

pass

class CustomWidgetApp(App):

def build(self):

return CustomWidget()

customWidget = CustomWidgetApp()

customWidget.run()

# ---------- CUSTOMWIDGET.KV ----------

# You can set default attributes that are shared by

# other widgets

# color is RGBA as a percent of 255 and alpha

# Color is the text color

# background_normal and background_down are either

# white with '' or can be set to a png

# background_color tints whatever the background is

<CustButton@Button>:

font_size: 32

color: 0, 0, 0, 1

size: 150, 50

background_normal: ''

background_down: 'bkgrd-down-color.png'

background_color: .88, .88, .88, 1

# Position is x and y from the bottom left hand corner

# You can define the position based on the changing

# window sizes with root.x being the left most side

# and root.y being the bottom

<CustomWidget>:

CustButton:

text: "Random"

pos: root.x, 200

CustButton:

text: "Buttons"

pos: 200, root.y

CustButton:

text: "Buttons"

pos: 200, 400

# ---------- KIVYTUT2.PY ----------

import kivy

kivy.require('1.9.0')

from kivy.app import App

from kivy.uix.floatlayout import FloatLayout

# A Float layout positions and sizes objects as a percentage

# of the window size

class FloatingApp(App):

def build(self):

return FloatLayout()

flApp = FloatingApp()

flApp.run()

# ---------- FLOATING.KV ----------

# size_hint defines the widget width (0-1) representing

# a percentage of 100% and height of the window

<CustButton@Button>:

font_size: 32

color: 0, 0, 0, 1

size: 150, 50

background_normal: ''

background_down: 'bkgrd-down-color.png'

background_color: .88, .88, .88, 1

size_hint: .4, .3

# pos_hint represents the position using either x, y, left,

# right, top, bottom, center_x, or center_y

<FloatLayout>:

CustButton:

text: "Top Left"

pos_hint: {"x": 0, "top": 1}

CustButton:

text: "Bottom Right"

pos_hint: {"right": 1, "y": 0}

CustButton:

text: "Top Right"

pos_hint: {"right": 1, "top": 1}

CustButton:

text: "Bottom Left"

pos_hint: {"left": 1, "bottom": 0}

CustButton:

text: "Center"

pos_hint: {"center_x": .5, "center_y": .5}

# ---------- KIVYTUT3.PY ----------

import kivy

kivy.require('1.9.0')

from kivy.app import App

from kivy.uix.gridlayout import GridLayout

# The Grid Layout organizes everything in a grid pattern

class GridLayoutApp(App):

def build(self):

return GridLayout()

glApp = GridLayoutApp()

glApp.run()

# ---------- GRIDLAYOUT.KV ----------

# Define the number of columns and rows

# Define the spacing between children in pixels

<GridLayout>:

cols: 2

rows: 2

spacing: 10

# Set the size by passing None to size_hint_x

# and then pass the width

Button:

text: "1st"

size_hint_x: None

width: 200

Button:

text: "2nd"

Button:

text: "3rd"

size_hint_x: None

width: 200

Button:

text: "4th"

# ---------- KIVYTUT4.PY ----------

import kivy

kivy.require('1.9.0')

from kivy.app import App

from kivy.uix.boxlayout import BoxLayout

# With a box layout we arrange widgets in a horizontal

# or vertical box

class BoxLayoutApp(App):

def build(self):

return BoxLayout()

blApp = BoxLayoutApp()

blApp.run()

# ---------- BOXLAYOUT.KV ----------

# Orientation defines whether widgets are stacked (vertical)

# or are placed side by side (horizontal)

# padding is the space between the widgets and the

# surrounding window

<BoxLayout>:

orientation: "vertical"

spacing: 10

padding: 10

# size_hint defines the percentage of space taken on the

# x access and the percentage of space left over by the

# other widgets

Button:

text: "1st"

size_hint: .7, .5

Button:

text: "2nd"

Button:

text: "3rd"

# ---------- KIVYTUT5.PY ----------

import kivy

kivy.require('1.9.0')

from kivy.app import App

from kivy.uix.stacklayout import StackLayout

# A stack layout arranges widgets vertically or horizontally

# as they best fit

class StackLayoutApp(App):

def build(self):

return StackLayout()

slApp = StackLayoutApp()

slApp.run()

# ---------- STACKLAYOUT.KV ----------

# orientation is lr-tb or left to right, top to bottom

# Other options are tb-lr, rl-tb, tb-rl, lr-bt, bt-lr,

# rl-bt, bt-rl

<StackLayout>:

orientation: "lr-tb"

spacing: 10

padding: 10

# size_hint defines the percentage of space taken on the

# x access and the percentage of space left over by the

# other widgets

Button:

text: "Q"

size_hint: None, .15

width: 100

Button:

text: "W"

size_hint: None, .15

width: 120

Button:

text: "E"

size_hint: None, .15

width: 140

Button:

text: "R"

size_hint: None, .15

width: 160

Button:

text: "T"

size_hint: None, .15

width: 180

Button:

text: "Y"

size_hint: None, .15

width: 200

# ---------- KIVYTUT6.PY ----------

import kivy

kivy.require('1.9.0')

from kivy.app import App

from kivy.uix.pagelayout import PageLayout

# A page layout is used to create multi-page layouts

# that you can flip through

class PageLayoutApp(App):

def build(self):

return PageLayout()

plApp = PageLayoutApp()

plApp.run()

# ---------- PAGELAYOUT.KV ----------

<PageLayout>:

Button:

text: "Page 1"

Button:

text: "Page 2"

Button:

text: "Page 3"

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Kivy Tutorial 2

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