Merge pull request #749 from MikeTheWatchGuy/Dev-latest

New Demos - Multiple windows design patterns

DemoPrograms/Demo_Design_Pattern_Multiple_Windows.py

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+import sys
+if sys.version_info[0] >= 3:
+    import PySimpleGUIQt as sg
+else:
+    import PySimpleGUI27 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
+"""
+
+# 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', location=(800,600)).Layout(layout)
+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 is None or event == '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.Text('', key='_OUTPUT_')],
+            [sg.Input(do_not_clear=True, key='_IN_')],
+            [sg.Button('Show'), sg.Button('Exit')]
+                ]
+        window2 = sg.Window('Second Window').Layout(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 is None:
+            # 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_Windows1.py

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+"""
+    PySimpleGUI The Complete Course
+    Lesson 7 - Multiple Windows
+"""
+import PySimpleGUI as sg
+
+# Design pattern 1 - First window does not remain active
+
+layout = [[ sg.Text('Window 1'),],
+          [sg.Input(do_not_clear=True)],
+          [sg.Text('', key='_OUTPUT_')],
+          [sg.Button('Launch 2')]]
+
+win1 = sg.Window('Window 1').Layout(layout)
+win2_active=False
+while True:
+    ev1, vals1 = win1.Read(timeout=100)
+    if ev1 is None:
+        break
+    win1.FindElement('_OUTPUT_').Update(vals1[0])
+
+    if ev1 == 'Launch 2' and not win2_active:
+        win2_active = True
+        win1.Hide()
+        layout2 = [[sg.Text('Window 2')],
+                   [sg.Button('Exit')]]
+
+        win2 = sg.Window('Window 2').Layout(layout2)
+        while True:
+            ev2, vals2 = win2.Read()
+            if ev2 is None or ev2 == 'Exit':
+                win2.Close()
+                win2_active = False
+                win1.UnHide()
+                break

DemoPrograms/Demo_Design_Pattern_Multiple_Windows2.py

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+"""
+    PySimpleGUI The Complete Course
+    Lesson 7 - Multiple Windows
+"""
+import PySimpleGUI as sg
+
+# Design pattern 2 - First window remains active
+
+layout = [[ sg.Text('Window 1'),],
+          [sg.Input(do_not_clear=True)],
+          [sg.Text('', key='_OUTPUT_')],
+          [sg.Button('Launch 2'), sg.Button('Exit')]]
+
+win1 = sg.Window('Window 1').Layout(layout)
+
+win2_active = False
+while True:
+    ev1, vals1 = win1.Read(timeout=100)
+    win1.FindElement('_OUTPUT_').Update(vals1[0])
+    if ev1 is None or ev1 == 'Exit':
+        break
+
+    if not win2_active and ev1 == 'Launch 2':
+        win2_active = True
+        layout2 = [[sg.Text('Window 2')],
+                   [sg.Button('Exit')]]
+
+        win2 = sg.Window('Window 2').Layout(layout2)
+
+    if win2_active:
+        ev2, vals2 = win2.Read(timeout=100)
+        if ev2 is None or ev2 == 'Exit':
+            win2_active  = False
+            win2.Close()