Ok. I'm deep into urwid (not so deep). Initially I made some changes to
urwid sources, then back to original and implemented some widgets to have
same behaviours.
To get the widget size is easy, it could be implemented for each basic
widget. To implement into library add *_size* property and *get_size* method
to urwid.Widget. The *_size* property is a tuple of 2 values: row count and
column count. The *get_size* method simply return *self._size*. Each basic
widget implementation (Frame, Filler, Text, ListBox, etc.) update its own
*_size* property as last operation in *render* method, the *_size* tuple is
updated with the canvas object created: self._size = (canv.rows (),
canv.cols ()).
Initially I made chages to the library sources (only for Frame, Filler, Text
and ListBox) then restored original sources and implemented a new set of
widget inherited from basic library widgets.
Here are the NewFrame and NewText widgets
# Class: NewFrame
class NewFrame (urwid.Frame):
_size = (0, 0)
def render (self, size, focus = False):
canvas = super (NewFrame, self).render (size, focus)
new_size = (canvas.rows (), canvas.cols ())
old_size = self._size
# check if to raise *on_resize* event
if new_size != old_size:
self.on_resize (new_size)
self._size = new_size
return canvas
def get_size (self):
return self._size
def on_resize (self, new_size):
pass
# Calss: NewText
class NewText (urwid.Text):
_size = (0, 0)
def render (self, size, focus = False):
canvas = super (NewText, self).render (size, focus)
new_size = (canvas.rows (), canvas.cols ())
old_size = self._size
# check if to raise *on_resize* event
if new_size != old_size:
self.on_resize (new_size)
self._size = new_size
return canvas
def get_size (self):
return self._size
def on_resize (self, new_size):
pass
I'm new to Python, so I guess there is a better way to implement them. The
widget size is basically solved and works with 'liquid layout' widgets, it
is valid after the *render* method is called and will be updated at each
(implicit or explicit) *render* calls. The event *on_resize* is called only
if the widget change size.
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