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Merge pull request #3241 from PySimpleGUI/Dev-latest 

Demo of element pinning capability
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PySimpleGUI 2020-08-03 15:59:28 -04:00 committed by GitHub
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DemoPrograms/Demo_Invisible_Elements_Pinning.py
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@ -3,45 +3,44 @@ import PySimpleGUI as sg
""" """
Demo - "Pinning" an element into a location in a layout Demo - "Pinning" an element into a location in a layout
Requires PySimpleGUI version 4.28.0 and greater
When using the tkinter port of PySimpleGUI, if you make an element invisible and then visible again, When using the tkinter port of PySimpleGUI, if you make an element invisible and then visible again,
rather than the element appearing where it was originally located, it will be moved to the bottom rather than the element appearing where it was originally located, it will be moved to the bottom
of whatever it was contained within (a window or a container element (column, frame, tab)) of whatever it was contained within (a window or a container element (column, frame, tab))
This demo adds a function "pin" which will place the element inside of a Column element. This will This demo uses a new "pin" function which will place the element inside of a Column element. This will
reserve a location for the element to be returned. reserve a location for the element to be returned.
Additionally, there will be a 1 pixel Canvas element inside the "pin".
This will cause the area to shrink when the element is made invisible. It's a weird tkinter thing. Not sure
exactly why it works, but it works.
For other ports of PySimpleGUI such as the Qt port, the position is remembered by Qt and as a For other ports of PySimpleGUI such as the Qt port, the position is remembered by Qt and as a
result this technique using Columns is not needed. result this technique using Columns is not needed.
Copyright 2020 PySimpleGUI.org Copyright 2020 PySimpleGUI.org
""" """
def pin(elem):
'''
Pin's an element provided into a layout so that when it's made invisible and visible again, it will
be in the correct place. Otherwise it will be placed at the end of its containing window/column.
:param elem: the element to put into the layout layout = [ [sg.Text('Hide Button or Input. Button3 hides Input. Buttons 1 & 2 hide Button 2')],
:return: A column element containing the provided element [sg.pin(sg.Input(key='-IN-'))],
''' [sg.pin(sg.Button('Button1')), sg.pin(sg.Button('Button2')), sg.B('Button3')],
return sg.Column([[elem, sg.Canvas(size=(0,0), pad=(0,0))]], pad=(0,0))
layout = [ [sg.Text('Window with Hidden Button')],
[sg.Input(key='-IN-')],
[pin(sg.Button('Button1')), pin(sg.Button('Button2')), sg.B('Button3')],
] ]
window = sg.Window('Window Title', layout) window = sg.Window('Visible / Invisible Element Demo', layout)
toggle = False toggle = toggle_in = False
while True: # Event Loop while True: # Event Loop
event, values = window.read() event, values = window.read()
print(event, values) print(event, values)
if event == sg.WIN_CLOSED or event == 'Exit': if event == sg.WIN_CLOSED or event == 'Exit':
break break
if event in ('Button1', 'Button2'):
window['Button2'].update(visible=toggle) window['Button2'].update(visible=toggle)
toggle = not toggle toggle = not toggle
if event == 'Button3':
window['-IN-'].update(visible=toggle_in)
toggle_in = not toggle_in
window.close() window.close()