dtlaunch: remember page between dtlaunch instances

[thyttan]

@bobrippling interested what you think about this!

Available on https://thyttan.github.io/BangleApps/?id=dtlaunch

• test for ram leaks

[thyttan]

hm, the linter doesn't seem to handle ?? well.

[thyttan]

It feels like this adds just enough milliseconds to be noticable when switching back and forth to the clock. Feels a little less snappy.

Might do some timings to compare.

[bobrippling]

I like the idea! Just a few questions about where we store variables

[bobrippling]

Similarly to the this thing above, do we want to chuck this onto Bangle, or perhaps we just have an unrelated global object we use instead?

[thyttan]

Maybe that's better!

Should I do it by e.g. global.dtlaunch = {}; global.dtlaunch.handlePagePersist = ()=>{...}?

[bobrippling]

Nice, yeah I think that'll work great - and if you make it

global.dtlaunch.handlePagePersist = function() {...}
//                                  ^~~~~~~~

then when you call it as dtlaunch.handlePagePersist(), then you can use this exactly as you intended (as this == dtlaunch)

[bobrippling]

Nice - perhaps we want to camelCase the function to keep with the existing pattern? (handlePagePersist instead of HandlePagePersist)

[thyttan]

Yes - just noticed that as well 👍

[thyttan]

Nice, yeah I think that'll work great - and if you make it

global.dtlaunch.handlePagePersist = function() {...}
//                                  ^~~~~~~~

then when you call it as dtlaunch.handlePagePersist(), then you can use this exactly as you intended (as this == dtlaunch)

Interesting! So that's a difference between function() {...} and () => {...} ?

[thyttan]

... also is the global at the beginning in your suggestion required as well?

[bobrippling]

Yes exactly - () => ... won't have its own this, it just uses one from up a level, whereas functions always have their own this. Also no, the global at the start of my suggestion isn't needed, nice spot

What you have now looks great btw!

[thyttan]

Measuring performance on non-pretokenized code:

Time to first draw: 438 ms -> 441 ms (shouldn't be noticable, I guess I placeboed myself)

Time until the whole file has run: 600 ms -> 615 ms

[bobrippling]

Here we go!