Suggestions

[MFlisar]

1. Use ViewBinding

I'd like to use ViewBinding instead of View in the viewBoundCallbacks - I would integrate this. What do you think about that?
This would remove the need for putting findViewById(...) calls into the callbacks.

As a side note, this callback could be used to easily replace all text/color adjustments but this would totally break backwards compatibility. But it would minimize the library functions...

2. Support more gravities

I'd like to add support for top/left/right/bottom and center here:

MaterialPopupMenu/material-popup-menu/src/main/java/androidx/appcompat/widget/MaterialRecyclerViewPopupWindow.kt

Lines 263 to 265 in 777bb86

	if ((dropDownGravity and Gravity.BOTTOM) == Gravity.BOTTOM) {
	dropDownVerticalOffset += anchorView!!.height
	}

3. Height calculation optimisation

I think following can be optimised for large menus:

MaterialPopupMenu/material-popup-menu/src/main/java/androidx/appcompat/widget/MaterialRecyclerViewPopupWindow.kt

Line 296 in 777bb86

private fun measureHeightOfChildrenCompat(maxHeight: Int): Int {

I think it would be save to stop iterating over the adapter items as soon as the total height has reached screen height, am I right?

[zawadz88]

Hi @MFlisar,
Sorry for not replying earlier.

1. Use ViewBinding

I'm rather reluctant in putting that in the SDK so that the library does not add a lot of transitive dependencies to the project's using it. The "view accessor" libraries also have a tendency to change over time, we also have Kotlin extensions, DataBinding, Compose on its way... I would like to avoid that in the SDK so that we don't need to modify it whenever a new version comes up.

2. Support more gravities

Center makes sense but I'm not sure how left/right or rather start/end affect dropDownVerticalOffset?

3. Height calculation optimisation

Makes sense. How do you plan to achieve that? I think we might want to check maxHeight if it's not larger then the current window (that's having multi-window on N+ and multiple screen devices)?

[MFlisar]

1. Use ViewBinding

I'm rather reluctant in putting that in the SDK so that the library does not add a lot of transitive dependencies to the project's using it. The "view accessor" libraries also have a tendency to change over time, we also have Kotlin extensions, DataBinding, Compose on its way... I would like to avoid that in the SDK so that we don't need to modify it whenever a new version comes up.

How about providing a small helper class instead? Instead of exposing a view expose a simple class like following, then you do not need to use ViewBinding inside your library:

class ViewData(
    val view: View,
    val textView: TextView,
    ....
)

2. Support more gravities

Center makes sense but I'm not sure how left/right or rather start/end affect dropDownVerticalOffset?

Actually in my own popup I've ended with following anchor types:

enum class Anchor {
    TopLeft, BottomLeft, TopRight, BottomRight, Center
}

Left, right alone does not make much sense probably...

3. Height calculation optimisation

Makes sense. How do you plan to achieve that? I think we might want to check maxHeight if it's not larger then the current window (that's having multi-window on N+ and multiple screen devices)?

I thought you can stop if you reached the current screens height - I did not think about multi window or multiple screen devices... Maybe something like stopping when reaching the root views height does the trick as well.