Phuket2
Sep 25, 2016 - 18:52
Hmm, Sunday nights 😱 Ok, this is a function to create a vertical list of views. Granted, it's not difficult, but can be a pain. The below is pretty flexible if you want to get started quickly with a vertical layout. It's also orientation and size friendly. If you take out the comments and test code, it's pretty tiny I think. Anyway, I know I will be able to use something like this. I will tweak it a bit to be able to use a scrollview and clean it up.
# Pythonista Forum - @Phuket2
import ui, editor
def simple_vert_view(parent, v_list, cv_margin=(0, 0),
v_margin=(0,0), *args, **kwargs):
'''
simple_h_view:
Description - creates a number of ui.Views vertically. A root ui.View
named 'cv' is created first. The vertical views are subviews of 'cv'
params -
1. parent = the parent view that this view will be a subview of
2. v_list = a list of numbers. each number represents the height
of the view. as follows
0 = fill the free space, if more than one, its divided
<1 = is a percentage if the overall height avail
>1 = is a abs points value
3. cv_margin, is used when creating the rect fir the 'cv' view.
the 'cv' is equal to the parent.bounds.inset(*cv_margin).
4. v_margin = is called on the ui.rect that is used to create
the view. The view is already sized as per the v_list.
so this will change the dimensions of the view. not trying to
go the other way, meaning adusting the abs values in the v_list,
would not be hard to do, but this way makes more sense i think.
5. **kwargs = kwargs are evaluated for every view, including the
'cv' view. just a choice.
returns:
a ui.View. The view returned is named 'cv', contains the views
created from v_list as subviews. each subview is named p0..pn
'''
r = ui.Rect(*parent.bounds).inset(*cv_margin)
cv = ui.View(name='cv', frame=r)
cv.bg_color = 'pink'
cv.flex = 'wh'
def translate_height(ph, h):
# i know can be done better... but thinking will expand this
if h == 0 or h > 1:
return h
elif h == -1:
return ph
elif h < 1.0:
return ph * h
def apply_kwargs(kwargs, obj):
for k, v in kwargs.items():
if hasattr(obj, k):
setattr(obj, k, v)
# translate the numbers in v_list to absolute numbers
v_list = [translate_height(r.height, x) if x else x for x in v_list]
# var is the space left over in the view after the absolute heights
# have been subtracted divided by the number if items that are
# equal to 0
zero_count = v_list.count(0)
# aviod divide by zero error
var = (r.height - sum(v_list)) / zero_count if zero_count else\
(r.height - sum(v_list))
# replaces 0 in v_list with var.
v_list = [var if x == 0 else x for x in v_list]
y = 0 # keep track of the height
# go through v_list, create the views as subviews of cv, and apply
# some attrs to the created views
for i, h in enumerate(v_list):
frame = ui.Rect(0, y, r.width, h).inset(*v_margin)
v = ui.View(name='p' + str(i), frame=frame)
v.flex = 'whlrtb'
apply_kwargs(kwargs, v)
cv.add_subview(v)
y += h
# hmmm, to do or not do?
apply_kwargs(kwargs, cv)
return cv
class MyClass(ui.View):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.make_view()
def make_view(self):
v_list = [44, 0, 0, 0, 44, .5, 60]
#v_list = [44, 0, 60]
#v_list = [.5, .4, 0, 0]
#v_list = [44, .2, 0, 60]
#v_list = [.5, .5]
#v_list = [48, .4, 0, 64]
v = simple_vert_view(self, v_list, cv_margin=(10, 10),
v_margin=(5, 5), corner_radius=5, border_width=.5)
self.add_subview(v)
if __name__ == '__main__':
_use_theme = True
w, h = 600, 800
f = (0, 0, w, h)
style = 'sheet'
mc = MyClass(frame=f, bg_color='white')
if not _use_theme:
mc.present(style=style, animated=False)
else:
editor.present_themed(mc, theme_name='Oceanic', style=style, animated=False)
# accessing a view, different ways
mc['cv']['p0'].bg_color = 'crimson'
cv = mc['cv']
cv.subviews[len(cv.subviews)-1].bg_color = 'cornflowerblue'
