def render(self, size, focus):
bottom_c = self.bottom_w.render(size, False)
if not bottom_c.cols() or not bottom_c.rows():
return urwid.CompositeCanvas(bottom_c)
top_size, _ = self._top_size(size, focus)
top_c = self.top_w.render(top_size, focus)
top_c = urwid.CompositeCanvas(top_c)
left = (size[0] - top_size[0]) // 2
top = (size[1] - top_size[1]) // 2
return urwid.CanvasOverlay(top_c, bottom_c, left, top)
def render(self, size, focus=False):
maxcol, maxrow = size
bottom_c = self.bottom_w.render(size, focus)
cursor = bottom_c.cursor
if not cursor:
# Hide the tooltip if there is no cursor.
return bottom_c
cursor_x, cursor_y = cursor
if cursor_y * 2 < maxrow:
# Cursor is in the top half. Tooltip goes below it:
y = cursor_y + 1
rows = maxrow - y
else:
# Cursor is in the bottom half. Tooltip fills the area above:
y = 0
rows = cursor_y
# HACK: shrink-wrap the tooltip. This is ugly in multiple ways:
# - It only works on a listbox.
# - It assumes the wrapping LineBox eats one char on each edge.
# - It is a loop.
# (ideally it would check how much free space there is,
# instead of repeatedly trying smaller sizes)
while 'bottom' in self.listbox.ends_visible((maxcol - 2, rows - 3)):
rows -= 1
# If we're displaying above the cursor move the top edge down:
if not y:
y = cursor_y - rows
# Render *both* windows focused. This is probably not normal in urwid,
# but it works nicely.
top_c = self.top_w.render((maxcol, rows),
focus and self.tooltip_focus)
combi_c = urwid.CanvasOverlay(top_c, bottom_c, 0, y)
# Use the cursor coordinates from the bottom canvas.
canvas = urwid.CompositeCanvas(combi_c)
canvas.cursor = cursor
return canvas
