listbox-crasher-386.py

# -*- coding: utf-8 -*-
import urwid
from urwid import MainLoop, ExitMainLoop
from urwid import Text, Edit, Button
from urwid import Frame, Pile, Padding, Filler, LineBox, Columns, Divider
from urwid import SolidFill, BoxAdapter

LOREM_IPSUM = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua."

def on_keypress(key):
    if key == 'q':
        raise ExitMainLoop()

def lorem_toggle(button):
    lorem_holder.edit_text = '' if lorem_holder.edit_text else LOREM_IPSUM


leftpane = Frame(
    body=Filler(Pile([
        Text("Steps to reproduce:"),
        Divider(" "),
        Text("1. Size down the terminal window so that Top Label in the right pane scrolls over the top."),
        Divider(" "),
        Text("2. Hit → (the right arrow key), then ↑↑↑↑ until Top Label is visible again. The Hmmm button is hidden now."),
        Divider(" "),
        Text("3. Hit ← and press Toggle Lorem Ipsum"),
        Divider(" "),
        Text("4. Hit → and ↓↓↓↓. Boom!"),
        Divider(" "),
        Padding(Button("Toggle Lorem Ipsum", on_press=lorem_toggle), width=22),
    ])),
    header=Text("ListBox #386 crash demo -- no Terminal used!"),
    footer=Text("Hit Q to exit")
)
lorem_holder = Edit()
lorem_holder._selectable = False
rightpane = urwid.ListBox(urwid.SimpleListWalker([
    Padding(LineBox(Text("Top Label")), left=5, right=5),
    Padding(BoxAdapter(SolidFill('.'), height=20), left=5, right=5),
    Padding(lorem_holder, left=5, right=5),

    Padding(urwid.Button("Hmmm..."), width=11),
    ]))

mainframe = Columns([
    LineBox(leftpane),
    LineBox(rightpane),
], dividechars=1)

urwid.set_encoding('utf-8')
MainLoop(mainframe, unhandled_input=on_keypress) \
    .run()