main.py

"""
Python QR Code Generator

Author: ImEasooon
License: MIT
GitHub: https://github.com/ImEasooon

Description:
A simple GUI-based QR code generator built with Python that allows users to generate QR codes from text and save them as image files.
"""

import sys
import tkinter as tk
from tkinter import ttk, messagebox, filedialog
import qrcode
import qrcode.constants
from PIL import ImageTk

class QRGenerator(tk.Tk):
    def __init__(self):
        super().__init__()
        self.inputValue = None
        # QR Object
        self.qr = None
        # OR Code PIL
        self.code = None
        # Tkinter Image (Showing)
        self.image = None

        # Title
        self.title("QR Code Generator")
        self.CenterWindowPosition(400, 500)
        self.resizable(False, False)
        self.protocol("WM_DELETE_WINDOW", self.ExitApplication)

        # Input Frame
        self.contentFrame = ttk.LabelFrame(self, text="Content Input")
        self.contentFrame.pack(padx=10, pady=10, fill="both")
        self.contentFrame.grid_anchor("center")

        # Source input
        ttk.Label(self.contentFrame, text="Data/ URL: ").grid(row=0, column=0, padx=5, pady=10)
        self.userInput = ttk.Entry(self.contentFrame, width=30)
        self.userInput.grid(row=0, column=1, padx=5, pady=10)
        
        # Generate button
        self.generateButton = ttk.Button(self.contentFrame, text="Generate", command=self.GenerateQR)
        self.generateButton.grid(row=0, column=2, padx=10, pady=10)
        
        # QR frame
        self.outputFrame = ttk.LabelFrame(self, text="Generated QR Code")
        self.outputFrame.pack(padx=10, pady=10, fill="both")
        self.outputFrame.grid_anchor("center")

        # Show the generated QR Code
        self.output = tk.Canvas(self.outputFrame, width=300, height=300)
        self.output.grid(row=0, column=0, padx=10, pady=10)

        # Save button
        self.saveButton = ttk.Button(self.outputFrame, text="Save", width=25, command=self.SaveQR)
        self.saveButton.grid(row=1, column=0, padx=10, pady=10)
        self.saveButton.grid_anchor("center")
    
    def CenterWindowPosition(self, width, height):
        windowWidth = self.winfo_screenwidth()
        windowHeight = self.winfo_screenheight()

        positionX = (windowWidth // 2) - (width // 2)
        positionY = (windowHeight // 2) - (height // 2)

        self.geometry(f"{width}x{height}+{positionX}+{positionY}")

    def GenerateQR(self):        
        self.inputValue = self.userInput.get()

        if not self.inputValue:
            messagebox.showwarning("Warning", "Please input any value before generating!")
            return
        
        self.qr = qrcode.QRCode(version=4, error_correction=qrcode.constants.ERROR_CORRECT_M, box_size=10, border=4)
        self.qr.add_data(self.inputValue)
        self.qr.make(fit=True)

        self.code = self.qr.make_image(fill_color="black", back_color="white")
        self.code = self.code.convert("RGB")
        self.code = self.code.resize((300, 300))

        self.image = ImageTk.PhotoImage(self.code)

        self.output.create_image(0, 0, anchor="nw", image=self.image)

    def SaveQR(self):
        if not self.qr:
            messagebox.showwarning("Warning", "Please generate a qr code before downloading!")
            return
        
        filePath = filedialog.asksaveasfilename(defaultextension="png", initialfile="qrcode", filetypes=[("PNG", "*.png"), ("JPEG", "*.jpeg"), ("JPG", "*.jpg")], title="Save As")

        if filePath:
            self.code.save(filePath)
            messagebox.showinfo("Success", f"QR code has been saved to {filePath}")
        else:
            messagebox.showerror("Error", "Failed to save the qr code! Please try again.")


    def ExitApplication(self):
        self.quit()
        sys.exit()

if __name__ == "__main__":
    App = QRGenerator()
    App.mainloop()