Use the NEW Timeout capability for timing... no more sleeps

Demo_Desktop_Widget_CPU_Utilization.py

@@ -49,7 +49,7 @@ def main():
                        justification='center', key='text')],
                  [sg.Text('', size=(30, 8), font=('Courier New', 12),text_color='white', justification='left', key='processes')],
                  [sg.Exit(button_color=('white', 'firebrick4'), pad=((15,0), 0), size=(9,1)),
-                  sg.Spin([x+1 for x in range(10)], 1, key='spin')],]
+                  sg.Spin([x+1 for x in range(10)], 3, key='spin')],]
 
     window = sg.Window('CPU Utilization',
                        no_titlebar=True,
@@ -59,25 +59,19 @@ def main():
     # start cpu measurement thread
     thread = Thread(target=CPU_thread,args=(None,))
     thread.start()
+    timeout_value = 1             # make first read really quick
+    g_interval = 1
     # ----------------  main loop  ----------------
     while (True):
         # --------- Read and update window --------
-        event, values = window.ReadNonBlocking()
+        event, values = window.Read(timeout=timeout_value, timeout_key='Timeout')
-
         # --------- Do Button Operations --------
-        if values is None or event == 'Exit':
+        if event is None or event == 'Exit':
             break
-        try:
-            g_interval = int(values['spin'])
-        except:
-            g_interval = 1
 
-        # cpu_percent = psutil.cpu_percent(interval=interval)       # if don't wan to use a task
+        timeout_value = int(values['spin']) * 1000
+
         cpu_percent = g_cpu_percent
-
-        # let the GUI run ever 700ms regardless of CPU polling time. makes window be more responsive
-        time.sleep(.7)
-
         display_string = ''
         if g_procs:
             # --------- Create list of top % CPU porocesses --------
@@ -93,13 +87,10 @@ def main():
             for proc, cpu in top_sorted:
                 display_string += '{:2.2f} {}\n'.format(cpu/10, proc)
 
-
+        # --------- Display timer and proceses in window --------
-        # --------- Display timer in window --------
         window.FindElement('text').Update('CPU {}'.format(cpu_percent))
         window.FindElement('processes').Update(display_string)
 
-    # Broke out of main loop. Close the window.
-    window.CloseNonBlocking()
     g_exit = True
     thread.join()
 

Demo_Desktop_Widget_CPU_Utilization_Simple.py

@@ -14,28 +14,28 @@ sg.ChangeLookAndFeel('Black')
 layout = [[sg.Text('CPU Utilization')],
           [sg.Text('', size=(8, 2), font=('Helvetica', 20), justification='center', key='_text_')],
           [sg.Exit(button_color=('white', 'firebrick4'), pad=((15, 0), 0), size=(9,1)),
-           sg.Spin([x + 1 for x in range(10)], 1, key='_spin_')]]
+           sg.Spin([x + 1 for x in range(10)], 3, key='_spin_')]]
 
 # Layout the rows of the Window
 window = sg.Window('CPU Meter',
                    no_titlebar=True,
                    keep_on_top=True,
-                   grab_anywhere=True).Layout(layout)
+                   grab_anywhere=True).Layout(layout).Finalize()
 
 # ----------------  main loop  ----------------
+interval = 10            # For the first one, make it quick
 while (True):
     # --------- Read and update window --------
-    event, values = window.ReadNonBlocking()
+    event, values = window.Read(timeout=interval)
-
     # --------- Do Button Operations --------
-    if values is None or event == 'Exit':
+    if event is None or event == 'Exit':
         break
-    try:
-        interval = int(values['_spin_'])
-    except:
-        interval = 1
 
-    cpu_percent = psutil.cpu_percent(interval=interval)
+    interval = int(values['_spin_'])*1000
+
+
+
+    cpu_percent = psutil.cpu_percent(interval=1)
 
     # --------- Display timer in window --------
 

Demo_Desktop_Widget_Timer.py

@@ -1,6 +1,5 @@
 #!/usr/bin/env python
 import sys
-import sys
 if sys.version_info[0] >= 3:
     import PySimpleGUI as sg
 else:
@@ -8,7 +7,15 @@ else:
 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.
+ 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
+ 
+ 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
+  accurate time value is displayed regardless of the accuracy of the PySimpleGUI timer tick. If
+  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\"
 """
 
@@ -32,14 +39,14 @@ start_time = int(round(time.time() * 100))
 while (True):
     # --------- Read and update window --------
     if not paused:
-        event, values = window.ReadNonBlocking()
+        event, values = window.Read(timeout=10)
         current_time = int(round(time.time() * 100)) - start_time
     else:
         event, values = window.Read()
     if event == 'button':
         event = window.FindElement(event).GetText()
     # --------- Do Button Operations --------
-    if values is None or event == 'Exit':
+    if event is None or event == 'Exit':        # ALWAYS give a way out of program
         break
     if event is 'Reset':
         start_time = int(round(time.time() * 100))
@@ -60,9 +67,5 @@ while (True):
     window.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.
-window.CloseNonBlocking()