Demo of PNG file viewer

Demo_PNG_Viewer.py

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+import PySimpleGUI as sg
+import os
+
+# Simple Image Browser based on PySimpleGUI
+
+# sg.ChangeLookAndFeel('GreenTan')
+
+# Get the folder containing the images from the user
+rc, folder = sg.GetPathBox('Image Browser', 'Image folder to open', default_path='A:/TEMP/PDFs')
+if rc is False or folder is '':
+    sg.MsgBoxCancel('Cancelling')
+    exit(0)
+
+# get list of PNG files in folder
+png_files = [folder + '\\' + f for f in os.listdir(folder) if '.png' in f]
+
+if len(png_files) == 0:
+    sg.MsgBox('No PNG images in folder')
+    exit(0)
+
+# create the form
+form = sg.FlexForm('Image Browser', return_keyboard_events=True)
+
+# make these 2 elements outside the layout because want to "update" them later
+image_elem = sg.Image(filename=png_files[0])
+text_elem = sg.Text(png_files[0], size=(80,3))
+
+# define layout, show and read the form
+layout = [[text_elem],
+          [image_elem],
+          [sg.ReadFormButton('Next', size=(8,2)), sg.ReadFormButton('Prev', size=(8,2))]]
+
+form.LayoutAndRead(layout)
+
+# loop reading the user input and display each image and the filename
+i=0
+while True:
+    f = png_files[i]
+    # update window with new image
+    image_elem.Update(filename=f)
+    # update window with filename
+    text_elem.Update(f)
+    # read the form
+    button, values = form.Read()
+
+    # perform button operations
+    if button is None:
+        break
+    elif button in ('Next', 'MouseWheel:Down', 'Down:40', 'Next:34') and i < len(png_files):
+        i += 1
+    elif button in ('Prev', 'MouseWheel:Up', 'Up:38', 'Prior:33') and i > 0:
+        i -= 1
+    # else:
+    #     print(button)
+
+