Reworked the demo

DemoPrograms/Demo_Column_Collapsible_Sections.py

@@ -5,37 +5,36 @@ import PySimpleGUI as sg
 
     This demo shows one techinique for creating a collapsible section (Column) within your window.
 
-    It uses the "pin" function so you'll need version 4.28.0+
-
-    A number of "shortcut aliases" are used in the layouts to compact things a bit.
-    In case you've not encountered these shortcuts, the meaning are:
-    B = Button, T = Text, I = Input = InputText, k = key
-    Also, both methods for specifying Button colors were used (tuple / single string)
-    Section #2 uses them the most to show you what it's like to use more compact names.
-
     To open/close a section, click on the arrow or name of the section.
     Section 2 can also be controlled using the checkbox at the top of the window just to
     show that there are multiple way to trigger events such as these.
     
-    Copyright 2020 PySimpleGUI.org
+    Feel free to modify to use the fonts and sizes of your choosing.  It's 1 line of code to make the section.
+    It could have been done directly in the layout.
+
+    Copyright 2021 PySimpleGUI.org
 """
 
 
-SYMBOL_UP =    '▲'
+def Collapsible(layout, key, title='', arrows=(sg.SYMBOL_DOWN, sg.SYMBOL_UP), collapsed=False):
-SYMBOL_DOWN =  '▼'
-
-
-def collapse(layout, key):
     """
-    Helper function that creates a Column that can be later made hidden, thus appearing "collapsed"
+    User Defined Element
-    :param layout: The layout for the section
+    A "collapsable section" element. Like a container element that can be collapsed and brought back
-    :param key: Key used to make this seciton visible / invisible
+    :param layout:Tuple[List[sg.Element]]: The layout for the section
-    :return: A pinned column that can be placed directly into your layout
+    :param key:Any: Key used to make this section visible / invisible
-    :rtype: sg.pin
+    :param title:str: Title to show next to arrow
+    :param arrows:Tuple[str, str]: The strings to use to show the section is (Open, Closed).
+    :param collapsed:bool: If True, then the section begins in a collapsed state
+    :return:sg.Column: Column including the arrows, title and the layout that is pinned
     """
-    return sg.pin(sg.Column(layout, key=key))
+    return sg.Column([[sg.T((arrows[1] if collapsed else arrows[0]), enable_events=True, k=key+'-BUTTON-'),
+                       sg.T(title, enable_events=True, key=key+'-TITLE-')],
+                      [sg.pin(sg.Column(layout, key=key, visible=not collapsed, metadata=arrows))]], pad=(0,0))
 
 
+SEC1_KEY = '-SECTION1-'
+SEC2_KEY = '-SECTION2-'
+
 section1 = [[sg.Input('Input sec 1', key='-IN1-')],
             [sg.Input(key='-IN11-')],
             [sg.Button('Button section 1',  button_color='yellow on green'),
@@ -48,38 +47,29 @@ section2 = [[sg.I('Input sec 2', k='-IN2-')],
              sg.B('Button2 section 2', button_color=('yellow', 'purple')),
              sg.B('Button3 section 2', button_color=('yellow', 'purple'))]]
 
-
 layout =   [[sg.Text('Window with 2 collapsible sections')],
-            [sg.Checkbox('Blank checkbox'), sg.Checkbox('Hide Section 2', enable_events=True, key='-OPEN SEC2-CHECKBOX')],
+            [sg.Checkbox('Blank checkbox'), sg.Checkbox('Hide Section 2', enable_events=True, key='-OPEN SEC2-CHECKBOX-')],
             #### Section 1 part ####
-            [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-TEXT')],
+            [Collapsible(section1, SEC1_KEY,  'Section 1', collapsed=True)],
-            [collapse(section1, '-SEC1-')],
             #### Section 2 part ####
-            [sg.T(SYMBOL_DOWN, enable_events=True, k='-OPEN SEC2-', text_color='purple'),
+            [Collapsible(section2, SEC2_KEY, 'Section 2', arrows=( sg.SYMBOL_TITLEBAR_MINIMIZE, sg.SYMBOL_TITLEBAR_MAXIMIZE))],
-             sg.T('Section 2', enable_events=True, text_color='purple', k='-OPEN SEC2-TEXT')],
-            [collapse(section2, '-SEC2-')],
-            #### Buttons at bottom ####
             [sg.Button('Button1'),sg.Button('Button2'), sg.Button('Exit')]]
 
 window = sg.Window('Visible / Invisible Element Demo', layout)
 
-opened1, opened2 = 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-'):
+    if event.startswith(SEC1_KEY):
-        opened1 = not opened1
+        window[SEC1_KEY].update(visible=not window[SEC1_KEY].visible)
-        window['-OPEN SEC1-'].update(SYMBOL_DOWN if opened1 else SYMBOL_UP)
+        window[SEC1_KEY+'-BUTTON-'].update(window[SEC1_KEY].metadata[0] if window[SEC1_KEY].visible else window[SEC1_KEY].metadata[1])
-        window['-SEC1-'].update(visible=opened1)
 
-    if event.startswith('-OPEN SEC2-'):
+    if event.startswith(SEC2_KEY) or event == '-OPEN SEC2-CHECKBOX-':
-        opened2 = not opened2
+        window[SEC2_KEY].update(visible=not window[SEC2_KEY].visible)
-        window['-OPEN SEC2-'].update(SYMBOL_DOWN if opened2 else SYMBOL_UP)
+        window[SEC2_KEY+'-BUTTON-'].update(window[SEC2_KEY].metadata[0] if window[SEC2_KEY].visible else window[SEC2_KEY].metadata[1])
-        window['-OPEN SEC2-CHECKBOX'].update(not opened2)
+        window['-OPEN SEC2-CHECKBOX-'].update(not window[SEC2_KEY].visible)
-        window['-SEC2-'].update(visible=opened2)
 
 window.close()