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Merge pull request #5058 from PySimpleGUI/Dev-latest 

Design Pattern 2B - point out the update calls are not shown in the w…
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PySimpleGUI 2022-01-01 13:00:02 -05:00 committed by GitHub
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@ -288,7 +288,12 @@ window['-OUTPUT-'].update(values['-IN-'])
`window['-OUTPUT-']` returns the element that has the key `'-OUTPUT-'`. Then the `update` method for that element is called so that the value of the Text Element is modified. Be sure you have supplied a `size` that is large enough to display your output. If the size is too small, the output will be truncated.
If you need to interact with elements prior to calling `window.read()` you will need to "finalize" your window first using the `finalize` parameter when you create your `Window`. "Interacting" means calling that element's methods such as `update`, `draw_line`, etc.
There are **two important concepts when updating elements!**
1. If you need to interact with elements prior to calling `window.read()` you will need to "finalize" your window first using the `finalize` parameter when you create your `Window`. "Interacting" means calling that element's methods such as `update`, `expand`, `draw_line`, etc.
2. Your change ***will not be visible in the window until*** you either:
A. Call `window.read()` again
B. Call `window.refresh()
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