main.py

import viewer # Python Beat C#

# Python WON 🎉🎉🎉

viewer.py

# viewer.py

import PySimpleGUI as sg
import os.path

# First the window layout in 2 columns

file_list_column = [
    [
        sg.Text("Image Folder"),
        sg.In(size=(25, 1), enable_events=True, key="-FOLDER-"),
        sg.FolderBrowse(),
    ],
    [
        sg.Listbox(
            values=[], enable_events=True, size=(40, 20), key="-FILE LIST-"
        )
    ],
]


# For now will only show the name of the file that was chosen
image_viewer_column = [
    [sg.Text("Choose an image from list on left:")],
    [sg.Text(size=(40, 1), key="-TOUT-")],
    [sg.Image(key="-IMAGE-")],
]

# ----- Full layout -----
layout = [
    [
        sg.Column(file_list_column),
        sg.VSeperator(),
        sg.Column(image_viewer_column),
    ]
]

window = sg.Window("Image Viewer", layout)

while True:
    event, values = window.read()
    if event == "Exit" or event == sg.WIN_CLOSED:
        break

    # Folder name was filled in, make a list of files in the folder
    if event == "-FOLDER-":
      folder = values["-FOLDER-"]
      try:
          # Get list of files in folder
          file_list = os.listdir(folder)
      except:
        file_list = []

      fnames = [
        f
        for f in file_list
        if os.path.isfile(os.path.join(folder, f))
        and f.lower().endswith((".png", ".gif"))
    ]
      window["-FILE LIST-"].update(fnames)
    elif event == "-FILE LIST-":  # A file was chosen from the listbox
      try:
        filename = os.path.join(
            values["-FOLDER-"], values["-FILE LIST-"][0]
        )
        window["-TOUT-"].update(filename)
        window["-IMAGE-"].update(filename=filename)
      except:
        pass


window.close()