咨询PySimpleGUI中实现位置层级嵌套下拉菜单的可行方案

Does PySimpleGUI Support Freely Placed Nested Dropdowns? #

PySimpleGUI doesn’t have a built-in, freely placeable nested dropdown component. The standard Menu is fixed to the window top, and Combo can’t natively render hierarchical structures (it flattens all entries into a single list). Below are practical workarounds to implement your location hierarchy.

Solution 1: Cascading PopupMenus (Click-to-Reveal Nested Options) #

Use buttons that trigger popup_menu with nested entries. This mimics a dropdown structure that can be placed anywhere in your layout.

import PySimpleGUI as sg

layout = [
    [sg.Button('Select Location', key='-LOCATION_BTN-')]
]

window = sg.Window('Nested Location Selector', layout)

while True:
    event, values = window.read()
    if event == sg.WIN_CLOSED:
        break
    elif event == '-LOCATION_BTN-':
        # Define your hierarchical menu structure
        location_menu = [
            ['Rack 1', 
                ['Shelf 1', ['Bin A', 'Bin B', 'Bin C', 'Bin D', 'Bin E']],
                ['Shelf 2', ['Bin F', 'Bin G']],
                'Shelf 3'
            ],
            ['Rack 2', ['Shelf 1', ['Bin H']]]
        ]
        # Show menu at the button's screen position
        button_pos = window['-LOCATION_BTN-'].get_screen_rect()[0:2]
        selected = sg.popup_menu(location_menu, title='Pick a Location', location=button_pos)
        if selected:
            sg.popup(f'Selected: {selected}')

window.close()

Solution 2: Linked Cascading Combos (Step-by-Step Selection) #

Use a series of Combo components that update dynamically based on previous selections. This breaks the hierarchy into sequential, dependent dropdowns.

import PySimpleGUI as sg

# Define your hierarchical location data
location_data = {
    'Main Location': {
        'Rack 1': {
            'Shelf 1': ['Bin A', 'Bin B', 'Bin C'],
            'Shelf 2': ['Bin D', 'Bin E']
        },
        'Rack 2': {
            'Shelf 1': ['Bin F']
        }
    },
    'Secondary Location': {
        'Rack 3': {
            'Shelf 3': ['Bin G']
        }
    }
}

layout = [
    [sg.Text('Location:'), sg.Combo(list(location_data.keys()), key='-LOC-', enable_events=True)],
    [sg.Text('Rack:'), sg.Combo([], key='-RACK-', enable_events=True, disabled=True)],
    [sg.Text('Shelf:'), sg.Combo([], key='-SHELF-', enable_events=True, disabled=True)],
    [sg.Text('Bin:'), sg.Combo([], key='-BIN-', disabled=True)]
]

window = sg.Window('Linked Cascading Combos', layout)

while True:
    event, values = window.read()
    if event == sg.WIN_CLOSED:
        break
    # Update rack options when location is selected
    elif event == '-LOC-':
        selected_loc = values['-LOC-']
        window['-RACK-'].update(values=list(location_data[selected_loc].keys()), disabled=False)
        window['-SHELF-'].update(values=[], disabled=True)
        window['-BIN-'].update(values=[], disabled=True)
    # Update shelf options when rack is selected
    elif event == '-RACK-':
        selected_loc = values['-LOC-']
        selected_rack = values['-RACK-']
        window['-SHELF-'].update(values=list(location_data[selected_loc][selected_rack].keys()), disabled=False)
        window['-BIN-'].update(values=[], disabled=True)
    # Update bin options when shelf is selected
    elif event == '-SHELF-':
        selected_loc = values['-LOC-']
        selected_rack = values['-RACK-']
        selected_shelf = values['-SHELF-']
        window['-BIN-'].update(values=location_data[selected_loc][selected_rack][selected_shelf], disabled=False)

window.close()

Solution 3: TreeView Component (Visual Hierarchy Display) #

Use TreeView to render the entire hierarchy in a collapsible, visual format. Users can expand nodes and select any level of the location structure.

import PySimpleGUI as sg

# Build tree structure from your location data
tree_data = sg.TreeData()

# Add root location nodes
tree_data.Insert('', 'loc1', 'Main Location', [])
tree_data.Insert('', 'loc2', 'Secondary Location', [])

# Add racks and shelves under Main Location
tree_data.Insert('loc1', 'rack1', 'Rack 1', [])
tree_data.Insert('rack1', 'shelf1', 'Shelf 1', [])
# Add bins to Shelf 1
for bin_name in ['Bin A', 'Bin B', 'Bin C', 'Bin D', 'Bin E']:
    tree_data.Insert('shelf1', bin_name.lower(), bin_name, [])
tree_data.Insert('rack1', 'shelf2', 'Shelf 2', [])
tree_data.Insert('loc1', 'rack2', 'Rack 2', [])

# Add nodes for Secondary Location
tree_data.Insert('loc2', 'rack3', 'Rack 3', [])

layout = [
    [sg.Tree(tree_data, headings=[''], auto_size_columns=True, num_rows=10, key='-TREE-', enable_events=True)],
    [sg.Text('Selected Item:'), sg.Text('', key='-SELECTED-')]
]

window = sg.Window('TreeView Location Hierarchy', layout)

while True:
    event, values = window.read()
    if event == sg.WIN_CLOSED:
        break
    elif event == '-TREE-':
        selected_item = values['-TREE-'][0] if values['-TREE-'] else ''
        window['-SELECTED-'].update(selected_item)

window.close()

内容的提问来源于stack exchange，提问作者Robert Munroe