Python script with tkinter GUI to capture images from Raspberry Pi Camera Module 3, with Toggling AF mode function.

This exercise work on last exercise "Python script with tkinter GUI to capture images from Raspberry Pi Camera Module 3", added function to toggle AfMode between Continuous and Manual.

It works on Raspberry Pi 4B running 32-bit Raspberry Pi OS (Bookworm), with Camera Module 3.

cam_tkinter_capture.py (2023-10-15)

from tkinter import *
from tkinter import messagebox
from picamera2 import Picamera2, Preview
from libcamera import controls
import time
import sys
import importlib.metadata

picam2 = Picamera2()
camera_config = picam2.create_preview_configuration()
picam2.configure(camera_config)
picam2.start_preview(Preview.QTGL)
picam2.set_controls({"AfMode": controls.AfModeEnum.Continuous})
picam2.start()

root = Tk()
root.title(sys.argv[0])
root.geometry("550x450")
# center on screen
root.eval('tk::PlaceWindow . center')

label_picam_ver = Label(root,
                        text="picamera2 ver: " + importlib.metadata.version('picamera2'),
                        anchor="e",
                        )
label_picam_ver.pack(fill = "x", padx=(10, 10), pady=10)

labelframe = LabelFrame(root, text="Click button to capture image")
labelframe.pack(fill = "both", expand = "yes")

def capture_button_CallBack():
    print("- Capture image -")
    timeStamp = time.strftime("%Y%m%d-%H%M%S")
    targetPath="/home/pi/Desktop/img_"+timeStamp+".jpg"
    picam2.capture_file(targetPath)
    print("image save:", targetPath)
    print("----------------------------------------------------")

capture_button = Button(labelframe, text ="Capture", command = capture_button_CallBack)
capture_button.pack()

def AF_button_tpggled():
    if AF_button.config('relief')[-1] == 'sunken':
        AF_button.config(relief='raised')
        picam2.set_controls({"AfMode": controls.AfModeEnum.Manual})
    else:
        AF_button.config(relief='sunken')
        picam2.set_controls({"AfMode": controls.AfModeEnum.Continuous})
        
    print(picam2.controls.AfMode)
    
AF_button = Button(labelframe, text="Continuous Focus", relief="sunken", command=AF_button_tpggled)
AF_button.pack()

def on_closing():
    if messagebox.askokcancel("Quit", "Do you want to quit?"):
        
        # if preview window cloased before,
        # will raise RuntimeError of No preview specified.
        try:
            picam2.stop_preview()
        except RuntimeError as e:
            print(e)
        root.destroy()
        
root.protocol("WM_DELETE_WINDOW", on_closing)

root.mainloop()

Exercises run on Raspberry Pi 5 running 64-bit Raspberry Pi OS (bookworm) with Camera Module 3:
~ Using the Raspberry Pi Camera in Python3/PyQt5 applications using picamera2 lib