Replaced one multi-window design pattern with new read_all_windows

DemoPrograms/Demo_Design_Pattern_Multiple_Windows.py

@@ -1,54 +1,43 @@
 import PySimpleGUI as sg
 """
-    Demo - Running 2 windows with both being active at the same time
+    Demo - 2 simultaneous windows using read_all_window
-    Three important things to note about this design patter:
+
-        1. The layout for window 2 is inside of the while loop, just before the call to window2=sg.Window
+    Window 1 launches window 2
-        2. The read calls have timeout values of 100 and 0.  You can change the 100 to whatever interval you wish
+    BOTH remain active in parallel
-            but must keep the second window's timeout at 0
+
-        3. There is a safeguard to stop from launching multiple copies of window2.  Only 1 window2 is visible at a time
+    Both windows have buttons to launch popups.  The popups are "modal" and thus no other windows will be active
+
+    Copyright 2020 PySimpleGUI.org
 """
 
-sg.theme('Dark Blue 3')
+def make_win1():
-# Window 1 layout
+    layout = [[sg.Text('This is the FIRST WINDOW'), sg.Text('      ', k='-OUTPUT-')],
-layout = [
-            [sg.Text('This is the FIRST WINDOW'), sg.Text('      ', key='-OUTPUT-')],
               [sg.Text()],
-            [sg.Button('Launch 2nd Window'), sg.Button('Popup'), sg.Button('Exit')]
+              [sg.Button('Launch 2nd Window'), sg.Button('Popup'), sg.Button('Exit')]]
-         ]
+    return sg.Window('Window Title', layout, location=(800,600), finalize=True)
+
+
+def make_win2():
+    layout = [[sg.Text('The second window')],
+              [sg.Input(key='-IN-')],
+              [sg.Text(size=(25,1), k='-OUTPUT-')],
+              [sg.Button('Show'), sg.Button('Popup'), sg.Button('Exit')]]
+    return sg.Window('Second Window', layout, finalize=True)
+
+window1, window2 = make_win1(), None        # start off with 1 window open
 
-window = sg.Window('Window Title', layout, location=(800,600))
-win2_active = False
-i=0
 while True:             # Event Loop
-    event, values = window.read(timeout=100)
+    window, event, values = sg.read_all_windows()
-    if event != sg.TIMEOUT_KEY:
+    if event == sg.WIN_CLOSED or event == 'Exit':
-        print(i, event, values)
+        window.close()
-    if event in (sg.WIN_CLOSED, 'Exit'):
+        if window == window2:       # if closing win 2, mark as closed
+            window2 = None
+        elif window == window1:     # if closing win 1, exit program
             break
     elif event == 'Popup':
         sg.popup('This is a BLOCKING popup','all windows remain inactive while popup active')
-    i+=1
+    elif event == 'Launch 2nd Window' and not window2:
-    if event == 'Launch 2nd Window' and not win2_active:     # only run if not already showing a window2
+        window2 = make_win2()
-        win2_active = True
+    elif event == 'Show':
-        # window 2 layout - note - must be "new" every time a window is created
+        window['-OUTPUT-'].update(f'You enetered {values["-IN-"]}')
-        layout2 = [
-            [sg.Text('The second window')],
-            [sg.Input(key='-IN-')],
-            [sg.Button('Show'), sg.Button('Exit')]
-                ]
-        window2 = sg.Window('Second Window', layout2)
-    # Read window 2's events.  Must use timeout of 0
-    if win2_active:
-        # print("reading 2")
-        event, values = window2.read(timeout=100)
-        # print("win2 ", event)
-        if event != sg.TIMEOUT_KEY:
-            print("win2 ", event)
-        if event == 'Exit' or event == sg.WIN_CLOSED:
-            # print("Closing window 2", event)
-            win2_active = False
-            window2.close()
-        if event == 'Show':
-            sg.popup('You entered ', values['-IN-'])
-
 window.close()

DemoPrograms/Demo_Design_Pattern_Multiple_Windows_OLD METHOD.py

@@ -0,0 +1,55 @@
+import PySimpleGUI as sg
+"""
+    Demo - Running 2 windows with both being active at the same time
+    Three important things to note about this design patter:
+        1. The layout for window 2 is inside of the while loop, just before the call to window2=sg.Window
+        2. The read calls have timeout values of 100 and 0.  You can change the 100 to whatever interval you wish
+            but must keep the second window's timeout at 0
+        3. There is a safeguard to stop from launching multiple copies of window2.  Only 1 window2 is visible at a time
+"""
+
+sg.theme('Dark Blue 3')
+# Window 1 layout
+layout = [
+            [sg.Text('This is the FIRST WINDOW'), sg.Text('      ', key='-OUTPUT-')],
+            [sg.Text()],
+            [sg.Button('Launch 2nd Window'), sg.Button('Popup'), sg.Button('Exit')]
+         ]
+
+window = sg.Window('Window Title', layout, location=(800,600))
+
+win2_active = False
+i=0
+while True:             # Event Loop
+    event, values = window.read(timeout=100)
+    if event != sg.TIMEOUT_KEY:
+        print(i, event, values)
+    if event in (sg.WIN_CLOSED, 'Exit'):
+        break
+    elif event == 'Popup':
+        sg.popup('This is a BLOCKING popup','all windows remain inactive while popup active')
+    i+=1
+    if event == 'Launch 2nd Window' and not win2_active:     # only run if not already showing a window2
+        win2_active = True
+        # window 2 layout - note - must be "new" every time a window is created
+        layout2 = [
+            [sg.Text('The second window')],
+            [sg.Input(key='-IN-')],
+            [sg.Button('Show'), sg.Button('Exit')]
+                ]
+        window2 = sg.Window('Second Window', layout2)
+    # Read window 2's events.  Must use timeout of 0
+    if win2_active:
+        # print("reading 2")
+        event, values = window2.read(timeout=100)
+        # print("win2 ", event)
+        if event != sg.TIMEOUT_KEY:
+            print("win2 ", event)
+        if event == 'Exit' or event == sg.WIN_CLOSED:
+            # print("Closing window 2", event)
+            win2_active = False
+            window2.close()
+        if event == 'Show':
+            sg.popup('You entered ', values['-IN-'])
+
+window.close()