Question - how to pass input from one window to another

Type of Issues (Enhancement, Error, Bug, Question)

Question (basic)

Operating System

Win10-64

Python version

3.7.6

PySimpleGUI Port and Version

tkinter

PySimpleGUI Version: 4.29.0

tkinter version: 8.6.9

You can get these by adding this to the top of your file and running it:

import PySimpleGUI as sg

print(sg)             # Location of your PySimpleGUI.py file
print(sg.version)     # PySimpleGUI version number
print(sg.tclversion_detailed)   # tkinter detailed version number (in PySimpleGUI version 4.29.0+)
print(sg.sys.version) # Python version number

The tkinter version number can be obtained using above code in version 4.29.0+. If your code is prior:

print(sg.tkinter.Tcl().eval('info patchlevel'))

Your Experience Levels In Months or Years

6 mo__ Python programming experience
2 yrs__ Programming experience overall
n___ Have used another Python GUI Framework (tkinter, Qt, etc) previously (yes/no is fine)?

You have completed these steps:

• Read instructions on how to file an Issue
• Searched through main docs http://www.PySimpleGUI.org for your problem
• Searched through the readme for your specific port if not PySimpleGUI (Qt, WX, Remi)
• Looked for Demo Programs that are similar to your goal http://www.PySimpleGUI.com
• Note that there are also Demo Programs under each port on GitHub
• Run your program outside of your debugger (from a command line)
• Searched through Issues (open and closed) to see if already reported
• Try again by upgrading your PySimpleGUI.py file to use the current one on GitHub. Your problem may have already been fixed but is not yet on PyPI.

Description of Problem / Question / Details

How to pass input from one window into another in multi-window.

Details:
I copied the multi-window demo. Works great.
What I'm missing is how to move captured data from the 2nd window into the first.

Code To Duplicate

A short program that isolates and demonstrates the problem (i.e. please don't paste a link to your 400 line program.... instead paste your 10 line program in full).

Yes, it is a pain to narrow down problems, but it's part of the debugging process. Help me help you by providing something that can be executed so that work on getting you a fix or a workaround can immediately begin.

This pre-formatted code block is all set for you to paste in your bit of code:

import PySimpleGUI as sg

# Design pattern 2 - First window does remain active
layout = [[ sg.Text('Window 1'),],
          [sg.Input(do_not_clear=True)], # I want the output of win2 to show up here, so value of "chosenWell" str
          [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 ev1 == 'Launch 2' and not win2_active:
        cols=7
        sg.theme('BluePurple')
        win2_active = True
        layout2 = [[sg.Text('Window 2 - for diagram/selection of spot on consumable')],
                   [sg.B('\u20DD',size=(6,2),button_color=('orange','#223344'),key=(1,f'{i+1}'),pad=(0,0)) for i in range(cols)]+[sg.T(' ')],
                   [sg.T(' ')]+[sg.B('\u20DD',size=(6,2),button_color=('orange','#223344'),key=(2,f'{i+1}'),pad=(0,0)) for i in range(cols)],
                   [sg.B('\u20DD',size=(6,2),button_color=('orange','#223344'),key=(3,f'{i+1}'),pad=(0,0)) for i in range(cols)]+[sg.T(' ')],
                   [sg.T(' ')]+[sg.B('\u20DD',size=(6,2),button_color=('orange','#223344'),key=(4,f'{i+1}'),pad=(0,0)) for i in range(cols)],
                   [sg.B('\u20DD',size=(6,2),button_color=('orange','#223344'),key=(5,f'{i+1}'),pad=(0,0)) for i in range(cols)]+[sg.T(' ')]
                  ]
        win2 = sg.Window('',no_titlebar=True,alpha_channel=.9,grab_anywhere=True,element_justification='c').Layout(layout2)

    if win2_active:
        ev2, vals2 = win2.Read()
        if ev2 is None or ev2 == 'Exit':
            win2.Close()
            win2_active = False
        chosenWell=ev2
        print(chosenWell)
        win2.close()     

win1.close()

Start with the multi-window demo referenced in the issue and trace the win1/win2 event loops, especially win2.Read and the chosenWell value. Compare that flow with the main documentation's multi-window guidance; done means a minimal example clearly shows the selected value appearing in Window 1.