[urwid] understanding Piles

Keith Dart

2017-06-17 01:54:45 UTC

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Post by rustyhowell
I'm trying to understand how containers work in the overall layout of the
widgets. I have a simple example where I want two columns of widgets at the
top of the screen, and then a single column of widgets at the beneath that.
import urwid
cols = urwid.Columns([urwid.Text('Column1'), urwid.Text('Column2')])
pile = urwid.Pile([cols, urwid.Text("Merged Column")])
loop = urwid.MainLoop(pile)
loop.run()
The code above crashes with the stack trace below. I'm not sure what to
make of the error. What is the correct way to do what I'm wanting?
File "./testapp.py", line 8, in <module>
loop.run()
File "/home/rhowell/python3_venv/lib/python3.5/site-packages/urwid/main_loop.py",
line 278, in run
self._run()
File "/home/rhowell/python3_venv/lib/python3.5/site-packages/urwid/main_loop.py",
line 376, in _run
self.event_loop.run()
File "/home/rhowell/python3_venv/lib/python3.5/site-packages/urwid/main_loop.py",
line 682, in run
self._loop()
File "/home/rhowell/python3_venv/lib/python3.5/site-packages/urwid/main_loop.py",
line 710, in _loop
self._entering_idle()
File "/home/rhowell/python3_venv/lib/python3.5/site-packages/urwid/main_loop.py",
line 671, in _entering_idle
callback()
File "/home/rhowell/python3_venv/lib/python3.5/site-packages/urwid/main_loop.py",
line 564, in entering_idle
self.draw_screen()
File "/home/rhowell/python3_venv/lib/python3.5/site-packages/urwid/main_loop.py",
line 578, in draw_screen
canvas = self._topmost_widget.render(self.screen_size, focus=True)
File "/home/rhowell/python3_venv/lib/python3.5/site-packages/urwid/widget.py",
line 141, in cached_render
canv = fn(self, size, focus=focus)
File "/home/rhowell/python3_venv/lib/python3.5/site-packages/urwid/container.py",
line 1526, in render
canv = w.render((maxcol, rows), focus=focus and item_focus)
File "/home/rhowell/python3_venv/lib/python3.5/site-packages/urwid/widget.py",
line 141, in cached_render
canv = fn(self, size, focus=focus)
File "/home/rhowell/python3_venv/lib/python3.5/site-packages/urwid/container.py",
line 2085, in render
focus = focus and self.focus_position == i)
File "/home/rhowell/python3_venv/lib/python3.5/site-packages/urwid/widget.py",
line 141, in cached_render
canv = fn(self, size, focus=focus)
File "/home/rhowell/python3_venv/lib/python3.5/site-packages/urwid/widget.py",
line 1003, in render
(maxcol,) = size
ValueError: too many values to unpack (expected 1)
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