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Commit 03c6e91

Browse files
Merge pull request #240 from legopitstop/main
[Snippets] Added tkinter snippet
2 parents 8202e68 + ead93c6 commit 03c6e91

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---
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title: Display a Pillow Image
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description: Use Pillow to show an image in a Tkinter window.
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author: Legopitstop
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tags: app,hello-world,object-oriented
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---
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```py
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from tkinter import Tk, Label
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from PIL import Image, ImageDraw, ImageTk
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class App(Tk):
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def __init__(self):
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Tk.__init__(self)
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self.geometry("200x200")
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# PhotoImage must be global or be assigned to a class or it will be garbage collected.
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self.photo = ImageTk.PhotoImage(self.make_image())
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lbl = Label(self, image=self.photo)
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lbl.pack(expand=1)
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def make_image(self):
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width, height = 200, 200
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image = Image.new("RGB", (width, height), "white")
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# Create a drawing context
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draw = ImageDraw.Draw(image)
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# Draw a circle
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radius = 80
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center = (width // 2, height // 2)
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draw.ellipse(
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[
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(center[0] - radius, center[1] - radius),
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(center[0] + radius, center[1] + radius),
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],
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fill="red",
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outline="black",
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width=3,
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)
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return image
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# Usage:
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root = App()
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root.mainloop()
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```
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---
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title: Hello, World!
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description: Creates a basic Tkinter window with a "Hello, World!" label.
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author: Legopitstop
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tags: app,hello-world,object-oriented
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---
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```py
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from tkinter import Tk, Label
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class App(Tk):
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def __init__(self):
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Tk.__init__(self)
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self.geometry("200x200")
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self.lbl = Label(self, text='Hello, World!')
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self.lbl.pack(expand=1)
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# Usage:
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root = App()
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root.mainloop()
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```
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---
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title: Allow Alphanumeric
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description: A validation function to allow alphanumeric characters.
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author: Legopitstop
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tags: validation,alphanumeric
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---
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```py
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from tkinter import Tk, Entry
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def allow_alphanumeric(value):
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return value.isalnum() or value == ""
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# Usage:
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root = Tk()
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root.geometry("200x200")
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reg = root.register(allow_alphanumeric)
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Entry(root, validate="key", validatecommand=(reg, "%P")).pack()
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root.mainloop()
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```
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---
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title: Allow Decimal
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description: A validation function to allow only decimal numbers.
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author: Legopitstop
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tags: validation,decimals
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---
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```py
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from tkinter import Tk, Entry
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def allow_decimal(action, value):
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if action == "1":
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if value == "":
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return True
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try:
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float(value)
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return True
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except ValueError:
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return False
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return True
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# Usage:
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root = Tk()
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root.geometry("200x200")
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reg = root.register(allow_decimal)
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Entry(root, validate="key", validatecommand=(reg, "%d", "%P")).pack()
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root.mainloop()
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```
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---
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title: Allow Digits with A Max Length
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description: A validation function to allow only digits with a specified maximum length.
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author: Legopitstop
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tags: validation,max,length
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---
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```py
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from tkinter import Tk, Entry
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def allow_digits_with_max_length(action, value, max_length):
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if action == "1":
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return value == "" or (value.isdigit() and len(value) <= int(max_length))
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return True
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# Usage:
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root = Tk()
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root.geometry("200x200")
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reg = root.register(allow_digits_with_max_length)
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# 4 is the max length
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Entry(root, validate="key", validatecommand=(reg, "%d", "%P", 4)).pack()
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root.mainloop()
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```
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---
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title: Allow Lowercase
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description: A validation function to allow only lowercase alphabetic characters.
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author: Legopitstop
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tags: validation,lowercase
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---
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```py
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from tkinter import Tk, Entry
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def allow_lowercase(value):
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return value.islower() or value == ""
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# Usage:
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root = Tk()
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root.geometry("200x200")
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reg = root.register(allow_lowercase)
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Entry(root, validate="key", validatecommand=(reg, "%P")).pack()
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root.mainloop()
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```
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---
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title: Allow Negative Integers
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description: A validation function to allow only negative integers.
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author: Legopitstop
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tags: validation,negative,integers
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---
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```py
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from tkinter import Tk, Entry
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def allow_negative_integers(value):
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return (
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value in ("", "-") or value.startswith("-") and value[1:].isdigit()
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if value
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else True
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)
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# Usage:
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root = Tk()
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root.geometry("200x200")
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reg = root.register(allow_negative_integers)
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Entry(root, validate="key", validatecommand=(reg, "%P")).pack()
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root.mainloop()
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```
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---
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title: Allow Numbers in Range
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description: A validation function to allow only numbers within a specified range.
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author: Legopitstop
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tags: validation,number,range
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---
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```py
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from tkinter import Tk, Entry
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def allow_numbers_in_range(action, value, min_value, max_value):
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if action == "1":
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try:
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num = float(value)
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return float(min_value) <= num <= float(max_value)
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except ValueError:
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return False
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return True
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# Usage:
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root = Tk()
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root.geometry("200x200")
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reg = root.register(allow_numbers_in_range)
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# 0 is the minimum value
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# 10 is the maximum value
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Entry(root, validate="key", validatecommand=(reg, "%d", "%P", 0, 10)).pack()
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root.mainloop()
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```
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---
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title: Allow Only Alphabets
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description: A validation function to allow only alphabetic characters.
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author: Legopitstop
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tags: validation,alphabets
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---
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```py
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from tkinter import Tk, Entry
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def allow_only_alphabets(value):
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return value.isalpha() or value == ""
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# Usage:
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root = Tk()
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root.geometry("200x200")
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reg = root.register(allow_only_alphabets)
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Entry(root, validate="key", validatecommand=(reg, "%P")).pack()
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root.mainloop()
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```
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---
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title: Allow Only Digits
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description: A validation function to allow only digits.
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author: Legopitstop
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tags: validation,digits
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---
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```py
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from tkinter import Tk, Entry
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def allow_only_digits(value):
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return value.isdigit() or value == ""
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# Usage:
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root = Tk()
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root.geometry("200x200")
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reg = root.register(allow_only_digits)
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Entry(root, validate="key", validatecommand=(reg, "%P")).pack()
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root.mainloop()
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```

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