New demo - collapsable sections

DemoPrograms/Demo_Column_Collapsable_Sections.py

@@ -0,0 +1,68 @@
+import PySimpleGUI as sg
+
+"""
+    Demo - "Collapsable" sections of windows
+
+    This demo shows one techinique for creating a collapsable section (Column) within your window.
+
+    It uses the "pin" function so you'll need version 4.28.0+
+
+    Copyright 2020 PySimpleGUI.org
+"""
+
+SYMBOL_UP =    '▲'
+SYMBOL_DOWN =  '▼'
+
+def collapse(layout, key):
+    """
+    Helper function that creates a Column that can be later made hidden, thus appearing "collapsed"
+    :param layout: The layout for the section
+    :param key: Key used to make this seciton visible / invisible
+    :return: A pinned column that can be placed directly into your layout
+    :rtype: sg.pin
+    """
+    return sg.pin(sg.Column(layout, key=key))
+
+
+section1 = [[sg.pin(sg.Input('Input sec 1', key='-IN1-'))],
+            [sg.Input(key='-IN11-')],
+            [sg.pin(sg.Button('Button section 1', button_color='yellow on green')), sg.pin(sg.Button('Button2 section 1', button_color='yellow on green')), sg.B('Button3 section 1', button_color='yellow on green')]]
+
+section2 = [[sg.pin(sg.Input('Input sec 2', key='-IN2-'))],
+            [sg.Input(key='-IN21-')],
+            [sg.pin(sg.Button('Button section 2', button_color='yellow on purple')),sg.Button('Button2 section 2', button_color='yellow on purple'), sg.B('Button3 section 2', button_color='yellow on purple')]]
+
+
+layout = [  [sg.Text('Window with 2 collapsable sections')],
+            [sg.pin(sg.Input('Input 1', key='-IN0-'))],
+            [sg.T(SYMBOL_DOWN, enable_events=True, k='-OPEN SEC1-', text_color='yellow'), sg.T('Section 1', enable_events=True, text_color='yellow', k='-OPEN SEC1-0')],
+            [collapse(section1, '-SEC1-')],
+            [sg.T(SYMBOL_DOWN, enable_events=True, k='-OPEN SEC2-', text_color='purple'),
+             sg.T('Section 2', enable_events=True, text_color='purple', k='-OPEN SEC2-0')],
+            [collapse(section2, '-SEC2-')],
+            [sg.pin(sg.Button('Button1')), sg.pin(sg.Button('Button2')), sg.B('Hide/Unhide Input 1', k='-HIDE-IN1-')]]
+
+window = sg.Window('Visible / Invisible Element Demo', layout, finalize=True)
+
+toggle_in, opened1, opened2 = False, True, True
+
+while True:             # Event Loop
+    event, values = window.read()
+    print(event, values)
+    if event == sg.WIN_CLOSED or event == 'Exit':
+        break
+
+    if event.startswith('-OPEN SEC1-'):
+        opened1 = not opened1
+        window['-OPEN SEC1-'].update(SYMBOL_DOWN if opened1 else SYMBOL_UP)
+        window['-SEC1-'].update(visible=opened1)
+
+    if event.startswith('-OPEN SEC2-'):
+        opened2 = not opened2
+        window['-OPEN SEC2-'].update(SYMBOL_DOWN if opened2 else SYMBOL_UP)
+        window['-SEC2-'].update(visible=opened2)
+
+    if event == '-HIDE-IN1-':
+        window['-IN0-'].update(visible=toggle_in)
+        toggle_in = not toggle_in
+window.close()