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fill3: Optionally limit scroll of portals

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This commit is contained in:
Andrew Hamilton 2022-01-24 23:06:42 +10:00
parent e13d470d82
commit 923a72fef6
2 changed files with 34 additions and 1 deletions
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26
fill3/fill3/__init__.py
View file

@ -202,10 +202,14 @@ class ScrollBar:
class Portal:
def __init__(self, widget, position=(0, 0), background_char=" "):
def __init__(self, widget, position=(0, 0), background_char=" ",
is_scroll_limited=False, is_left_aligned=True, is_top_aligned=True):
self.widget = widget
self.position = position
self.background_char = background_char
self.is_scroll_limited = is_scroll_limited
self.is_left_aligned = is_left_aligned
self.is_top_aligned = is_top_aligned
self.last_dimensions = 0, 0
def _scroll_half_pages(self, dx, dy):
@ -225,6 +229,24 @@ class Portal:
def scroll_right(self):
self._scroll_half_pages(1, 0)
def limit_scroll(self, portal_dimensions, appearance_dimensions):
portal_width, portal_height = portal_dimensions
widget_width, widget_height = appearance_dimensions
x, y = self.position
if widget_width <= portal_width:
x = 0 if self.is_left_aligned else (widget_width - portal_width)
elif x < 0:
x = 0
elif x > (widget_width - portal_width):
x = widget_width - portal_width
if widget_height <= portal_height:
y = 0 if self.is_top_aligned else (widget_height - portal_height)
elif y < 0:
y = 0
elif y > (widget_height - portal_height):
y = widget_height - portal_height
return x, y
def appearance_for(self, dimensions):
width, height = dimensions
x, y = self.position
@ -232,6 +254,8 @@ class Portal:
appearance = self.widget.appearance_interval((max(y, 0), y+height))
except AttributeError:
appearance = self.widget.appearance()[max(y, 0):y+height]
if self.is_scroll_limited:
x, y = self.limit_scroll(dimensions, appearance_dimensions(appearance))
self.last_dimensions = dimensions
top = [self.background_char * width] * -y if y < 0 else []
bottom = appearance_resize([row[max(x, 0):x+width] for row in appearance],

9
fill3/tests/fill3_test.py
View file

@ -45,6 +45,15 @@ class WidgetTests(unittest.TestCase):
self.assert_string(portal.appearance_for((8, 3)), " \n foobar \n ")
portal.position = (5, 0)
self.assert_string(portal.appearance_for((2, 1)), "r ")
# limit scroll
portal.position = (0, 0)
self.assertEqual(portal.limit_scroll((1, 1), (1, 1)), (0, 0))
portal.position = (-1, 0)
self.assertEqual(portal.limit_scroll((1, 1), (1, 1)), (0, 0))
portal.position = (1, 0)
self.assertEqual(portal.limit_scroll((6, 1), (1, 1)), (0, 0))
portal.is_left_aligned = False
self.assertEqual(portal.limit_scroll((6, 1), (1, 1)), (-5, 0))
def test_border_widget(self):
contents = fill3.Filler(self.TEXT_A)