Updated Timer Demos and added 4-line OpenCV demo

DemoPrograms/Demo_Desktop_Widget_Timer.py

@@ -1,13 +1,10 @@
 #!/usr/bin/env python
-import sys
-if sys.version_info[0] >= 3:
 import PySimpleGUI as sg
-else:
-    import PySimpleGUI27 as sg
 import time
 
 """
- Timer Desktop Widget Creates a floating timer that is always on top of other windows You move it by grabbing anywhere on the window Good example of how to do a non-blocking, polling program using SimpleGUI Can be used to poll hardware when running on a Pi
+ Timer Desktop Widget Creates a floating timer that is always on top of other windows You move it by grabbing anywhere on the window Good example of how to do a non-blocking, polling program using PySimpleGUI 
+ Something like this can be used to poll hardware when running on a Pi
 
  While the timer ticks are being generated by PySimpleGUI's "timeout" mechanism, the actual value
   of the timer that is displayed comes from the system timer, time.time().  This guarantees an
@@ -15,57 +12,48 @@ import time
   this design were not used, then the time value displayed would slowly drift by the amount of time
   it takes to execute the PySimpleGUI read and update calls (not good!)
 
- NOTE - you will get a warning message printed when you exit using exit button.
- It will look something like: invalid command name \"1616802625480StopMove\"
 """
 
+def time_as_int():
+    return int(round(time.time() * 100))
 
 # ----------------  Create Form  ----------------
 sg.ChangeLookAndFeel('Black')
-sg.SetOptions(element_padding=(0, 0))
 
 layout = [[sg.Text('')],
          [sg.Text('', size=(8, 2), font=('Helvetica', 20), justification='center', key='text')],
-         [sg.Button('Pause', key='button', button_color=('white', '#001480')),
+         [sg.Button('Pause', key='-RUN-PAUSE-', button_color=('white', '#001480')),
-          sg.Button('Reset', button_color=('white', '#007339'), key='Reset'),
+          sg.Button('Reset', button_color=('white', '#007339'), key='-RESET-'),
           sg.Exit(button_color=('white', 'firebrick4'), key='Exit')]]
 
-window = sg.Window('Running Timer', no_titlebar=True, auto_size_buttons=False, keep_on_top=True, grab_anywhere=True).Layout(layout)
+window = sg.Window('Running Timer', layout, no_titlebar=True, auto_size_buttons=False, keep_on_top=True, grab_anywhere=True, element_padding=(0,0))
 
 # ----------------  main loop  ----------------
-current_time = 0
+current_time, paused_time, paused = 0, 0, False
-paused = False
+start_time = time_as_int()
-start_time = int(round(time.time() * 100))
 while (True):
     # --------- Read and update window --------
     if not paused:
         event, values = window.Read(timeout=10)
-        current_time = int(round(time.time() * 100)) - start_time
+        current_time = time_as_int() - start_time
     else:
         event, values = window.Read()
-    if event == 'button':
-        event = window.FindElement(event).GetText()
     # --------- Do Button Operations --------
     if event in (None, 'Exit'):        # ALWAYS give a way out of program
         break
-    if event == 'Reset':
+    if event == '-RESET-':
-        start_time = int(round(time.time() * 100))
+        paused_time = start_time = time_as_int()
         current_time = 0
-        paused_time = start_time
+    elif event == '-RUN-PAUSE-':
-    elif event == 'Pause':
+        paused = not paused
-        paused = True
+        if paused:
-        paused_time = int(round(time.time() * 100))
+            paused_time = time_as_int()
-        element = window.FindElement('button')
+        else:
-        element.Update(text='Run')
+            start_time = start_time + time_as_int() - paused_time
-    elif event == 'Run':
+        window['-RUN-PAUSE-'].Update('Run' if paused else 'Pause')      # Change button's text
-        paused = False
-        start_time = start_time + int(round(time.time() * 100)) - paused_time
-        element = window.FindElement('button')
-        element.Update(text='Pause')
 
     # --------- Display timer in window --------
-    window.FindElement('text').Update('{:02d}:{:02d}.{:02d}'.format((current_time // 100) // 60,
+    window['text'].Update('{:02d}:{:02d}.{:02d}'.format((current_time // 100) // 60,
                                                                   (current_time // 100) % 60,
                                                                   current_time % 100))
-
+window.close()
-# --------- After loop --------

DemoPrograms/Demo_OpenCV_4_Line_Program.py

@@ -0,0 +1,4 @@
+import cv2, PySimpleGUI as sg
+window, cap = sg.Window('Demo Application - OpenCV Integration', [[sg.Image(filename='', key='image')],], location=(800,400)), cv2.VideoCapture(0)
+while window(timeout=20)[0] is not None:
+    window['image'](data=cv2.imencode('.png', cap.read()[1])[1].tobytes())

DemoPrograms/Demo_Timer.py

@@ -7,37 +7,38 @@ def Timer():
     sg.ChangeLookAndFeel('Dark')
     sg.SetOptions(element_padding=(0,0))
     # Make a form, but don't use context manager
-    form = sg.FlexForm('Running Timer', no_titlebar=True, auto_size_buttons=False)
+    window = sg.Window('Running Timer', no_titlebar=True, auto_size_buttons=False)
     # Create a text element that will be updated with status information on the GUI itself
     # Create the rows
     form_rows = [[sg.Text('')],
                  [sg.Text('', size=(8, 2), font=('Helvetica', 20), justification='center', key='text')],
-                 [sg.ReadFormButton('Pause'), sg.ReadFormButton('Reset'), sg.Exit(button_color=('white','firebrick4'))]]
+                 [sg.Button('Pause', key='-RUN-PAUSE-'), sg.Button('Reset'), sg.Exit(button_color=('white','firebrick4'))]]
     # Layout the rows of the form and perform a read. Indicate the form is non-blocking!
-    form.Layout(form_rows)
+    window.Layout(form_rows)
     #
     # your program's main loop
     i = 0
     paused = False
+    start_time = int(round(time.time() * 100))
     while (True):
         # This is the code that reads and updates your window
-        button, values = form.ReadNonBlocking()
+        button, values = window.read(timeout=0)
-        form.FindElement('text').Update('{:02d}:{:02d}.{:02d}'.format((i // 100) // 60, (i // 100) % 60, i % 100))
+        window.FindElement('text').Update('{:02d}:{:02d}.{:02d}'.format((i // 100) // 60, (i // 100) % 60, i % 100))
 
         if values is None or button == 'Exit':
             break
 
         if button == 'Reset':
             i=0
-        elif button == 'Pause':
+        elif button == '-RUN-PAUSE-':
             paused = not paused
+            window['-RUN-PAUSE-'].Update('Run' if paused else 'Pause')
 
         if not paused:
             i += 1
-        # Your code begins here
+
-        time.sleep(.01)
 
     # Broke out of main loop. Close the window.
-    form.CloseNonBlockingForm()
+    window.close()
 
 Timer()