Major update of all demo programs to use new PEP8 bindings, etc

DemoPrograms old/Demo_Desktop_Widget_Timer.py

@@ -0,0 +1,59 @@
+#!/usr/bin/env python
+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 
+ 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
+  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!)
+
+"""
+
+def time_as_int():
+    return int(round(time.time() * 100))
+
+# ----------------  Create Form  ----------------
+sg.ChangeLookAndFeel('Black')
+
+layout = [[sg.Text('')],
+         [sg.Text('', size=(8, 2), font=('Helvetica', 20), justification='center', key='text')],
+         [sg.Button('Pause', key='-RUN-PAUSE-', button_color=('white', '#001480')),
+          sg.Button('Reset', button_color=('white', '#007339'), key='-RESET-'),
+          sg.Exit(button_color=('white', 'firebrick4'), key='Exit')]]
+
+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, paused_time, paused = 0, 0, False
+start_time = time_as_int()
+while (True):
+    # --------- Read and update window --------
+    if not paused:
+        event, values = window.Read(timeout=10)
+        current_time = time_as_int() - start_time
+    else:
+        event, values = window.Read()
+    # --------- Do Button Operations --------
+    if event in (None, 'Exit'):        # ALWAYS give a way out of program
+        break
+    if event == '-RESET-':
+        paused_time = start_time = time_as_int()
+        current_time = 0
+    elif event == '-RUN-PAUSE-':
+        paused = not paused
+        if paused:
+            paused_time = time_as_int()
+        else:
+            start_time = start_time + time_as_int() - paused_time
+        window['-RUN-PAUSE-'].Update('Run' if paused else 'Pause')      # Change button's text
+
+    # --------- Display timer in window --------
+    window['text'].Update('{:02d}:{:02d}.{:02d}'.format((current_time // 100) // 60,
+                                                                  (current_time // 100) % 60,
+                                                                  current_time % 100))
+window.close()