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#compose
Title
# compose
d

dimsuz

11/12/2021, 11:13 AM
How do I prevent 
PlotColors
being recreated on each composable function call here? I can't put this in "remember", because 
MyTheme.colors.someColor
is a 
Composable
getter:
Copy code
fun MyComposable() {
  val colors = PlotColors(
    positiveColor = MyTheme.colors.indicatorContentGreen,
    negativeColor = MyTheme.colors.indicatorBackgroundRed,
  )
}
Oh. I suppose I could do
Copy code
val positiveColor = MyTheme.colors.indicatorContentGreen,
  val negativeColor = MyTheme.colors.indicatorContentGreen,
  val colors by remember { PlotColors(positiveColor, negativeColor) }
but that would get very verbose in presence of many colors
c

Csaba Kozák

11/12/2021, 11:17 AM
Seems to be an unnecessary optimisation. You end up creating a lot more objects when using compose anyways. Compose will skip recomposition if your input does not change.
d

dimsuz

11/12/2021, 11:18 AM
Thought so too, asked just in case I sometime will need something like this in a performance critical path with a lot of updates.
c

Csaba Kozák

11/12/2021, 12:11 PM
If you have expensive calculations, you can use 
derivedStateOf
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