New when-able when. #2224
New when-able when. #2224
Conversation
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I can't quite work out if these unit tests will work if the handler is in a class. So I have added an example of that style. (the below is really pseudocode, as not run at all) from pyscript.web import page, body, div
class Mycontrol(object):
"""
This control creates a bit of UI and defines what to do when that bit of UI is interacted with
"""
def __init__(self, initial_values, parent=None):
self.parent = parent # so we can reach up to a parent structure to effect more complex actions
self.values = initial_values
self.widget = None # placeholder
def act(self,event):
"""
the UI got 'clicked' do something. called by @when
Probably replaced by the parent structure so more complex stuff can be done
"""
page.find("p").html("user clicked")
def get_widget(self):
" return the element to put in the UI "
mydiv = div("some title", classes="a-css-class", id="maindiv")
myp = p("click me", id="myp")
mydiv.append(myp)
# we could put the when in here but the element doesn't exist in the dom yet...
self.widget = mydiv
return mydiv
a = Mycontrol("stuff")
body.append(a.get_widget()) # can we add the when here ?
# or maybe a method of Mycontrol to add it once it exists ?
when(body.find("myp"), "click", a.act())In an 'ideal' world the widget class would probably have been imported from a sep file (allowing more component like structuring) |
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One common use case might be to use when for modelling objects with possibly "events" e.g. Traits, Traitlets, Param in Python, and EventTarget in JS). e.g. If I have some object that represents a car, I might have events for "started", "stopped" and "backfired" :) Maybe I could also had a listener for all events on the car? I'm not worried too much about the syntax |
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Description
DO NOT MERGE YET
A branch in which we work on the technical outcomes of the discussion over on #2203.
Changes
Checklist
make buildworks locally.