Compacted and commented code. Make more efficient by reading non-blocking only when timer is running

Demo_Desktop_Widget_Timer.py

@@ -2,59 +2,68 @@ import PySimpleGUI 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 PySimpleGUI
+    Can be used to poll hardware when running on a Pi
     
+    NOTE - you will get a warning message printed when you exit using exit button.
+    It will look something like:
+            invalid command name "1616802625480StopMove"
 """
 
-
-# form that doen't block
-# good for applications with an loop that polls hardware
 def Timer():
+    # ----------------  Create Form  ----------------
     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, keep_on_top=True, grab_anywhere=True)
-    # Create a text element that will be updated with status information on the GUI itself
-    # Create the rows
+    # Create the form layout
     form_rows = [[sg.Text('')],
                  [sg.Text('', size=(8, 2), font=('Helvetica', 20), justification='center', key='text')],
                  [sg.ReadFormButton('Pause', key='button'), sg.ReadFormButton('Reset'), sg.Exit(button_color=('white','firebrick4'))]]
     # Layout the rows of the form and perform a read. Indicate the form is non-blocking!
+    form = sg.FlexForm('Running Timer', no_titlebar=True, auto_size_buttons=False, keep_on_top=True, grab_anywhere=True)
     form.Layout(form_rows)
     #
-    # your program's main loop
-    i = 0
+    # ----------------  main loop  ----------------
+    current_time = 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()
-        #form.FindElement('text').Update('{:02d}:{:02d}.{:02d}'.format((i // 100) // 60, (i // 100) % 60, i % 100))
-        x = divmod(i, 100)
-        y = divmod(x[0], 60)
-        form.FindElement('text').Update('{:02d}:{:02d}.{:02d}'.format(y[0], y[1], x[1]))
+        # --------- Read and update window --------
+        if not paused:
+            button, values = form.ReadNonBlocking()
+            current_time = int(round(time.time()*100)) - start_time
+        else:
+            button, values = form.Read()
+
+        # --------- Do Button Operations --------
         if values is None or button == 'Exit':
             break
-        #print(button)
         if button is 'Reset':
-            i=0
+            start_time = int(round(time.time()*100))
+            current_time = 0
+            paused_time = start_time
         elif button == 'Pause':
             paused = True
+            paused_time = int(round(time.time()*100))
             element = form.FindElement('button')
             element.Update(new_text='Run')
         elif button == 'Run':
             paused = False
+            start_time = start_time + int(round(time.time()*100)) - paused_time
             element = form.FindElement('button')
             element.Update(new_text='Pause')
 
-        if not paused:
-            i += 1
-        # Your code begins here
+        # --------- Display timer in window --------
+        form.FindElement('text').Update('{:02d}:{:02d}.{:02d}'.format((current_time // 100) // 60,
+                                                                      (current_time // 100) % 60,
+                                                                       current_time % 100))
         time.sleep(.01)
 
+    # --------- After loop --------
+
     # Broke out of main loop. Close the window.
     form.CloseNonBlockingForm()