def reload_body(self, raster):
"""dynamically change the body of the widget according to the raster file"""
# empty the tbody children
self.tbody.children = []
# get the file features :
features = cs.unique(raster)
# create 1 line for each feature
tmp_children = []
for i in features:
# create a textField
field = v.TextField(placeholder="any value in [0, 256[",
type='number',
v_model=None,
value=i)
# js link to the global widget
field.observe(self._on_change, 'v_model')
# wrap it in a row
row = v.Html(tag='tr',
children=[
v.Html(tag='td', children=[str(i)]),
v.Html(tag='td', children=[field])
])
# add the row to the tbody
tmp_children += [row]
self.tbody.children += tmp_children
return self
def _on_change(self, change):
"""update the list according to the file selection"""
# get the nb_class
nb_class = len(self.classes)
# empty all select
for i in range(nb_class):
self.classes[i].v_model = None
# get all unique values from the image
features = cs.unique(change['new'])
# add the new list as items
for i in range(nb_class):
self.classes[i].items = features
return self
def _on_valid_band(self, change):
# switch band status
# cannot be done in the switch decorator as there number is
# undertermined at class creation
for w in self.classes:
w.loading = True
# exit if none
if change["new"] is None:
return self
# get the unique features
features = cs.unique(self.file.v_model, self.band.v_model)
for w in self.classes:
w.items = features
# switch back the states
for w in self.classes:
w.loading = False
return self