0.12.0, restructure folders, multi-window design patterns

PySimpleGUIQt/Demo Programs/Qt_Demo_OpenCV_Webcam.py

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+#!/usr/bin/env python
+import sys
+if sys.version_info[0] >= 3:
+    import PySimpleGUIQt as sg
+else:
+    import PySimpleGUI27 as sg
+import cv2
+import numpy as np
+from sys import exit as exit
+
+"""
+Demo program that displays a webcam using OpenCV
+"""
+def main():
+
+    sg.ChangeLookAndFeel('LightGreen')
+
+    # define the window layout
+    layout = [[sg.Text('OpenCV Demo', size=(40, 1), justification='center', font='Helvetica 20')],
+              [sg.Image(filename='', key='image')],
+              [sg.Button('Record', size=(10, 1), font='Helvetica 14'),
+               sg.Button('Stop', size=(10, 1), font='Any 14'),
+              sg.Button('Exit', size=(10, 1), font='Helvetica 14'),
+               sg.Button('About', size=(10,1), font='Any 14')]]
+
+    # create the window and show it without the plot
+    window = sg.Window('Demo Application - OpenCV Integration',
+                       location=(800,400))
+    window.Layout(layout)
+
+    # ---===--- Event LOOP Read and display frames, operate the GUI --- #
+    cap = cv2.VideoCapture(0)
+    recording = False
+    while True:
+        event, values = window.Read(timeout=0, timeout_key='timeout')
+        if event == 'Exit' or event is None:
+            sys.exit(0)
+            pass
+        elif event == 'Record':
+            recording = True
+        elif event == 'Stop':
+            recording = False
+            # img = np.full((480, 640),255)
+            # imgbytes=cv2.imencode('.png', img)[1].tobytes() #this is faster, shorter and needs less includes
+            # window.FindElement('image').Update(data=imgbytes)
+        elif event == 'About':
+            sg.PopupNoWait('Made with PySimpleGUI',
+                           'www.PySimpleGUI.org',
+                           'Check out how the video keeps playing behind this window.',
+                           'I finally figured out how to display frames from a webcam.',
+                           'ENJOY!  Go make something really cool with this... please!',
+                           keep_on_top=True)
+        if recording:
+            ret, frame = cap.read()
+            imgbytes=cv2.imencode('.png', frame)[1].tobytes() #ditto
+            window.FindElement('image').Update(data=imgbytes)
+
+main()
+exit()