I have an ExposedDropDownMenu that is extremely ~laggy~ delayed when opening. It takes like a good 4...

# compose

[Colton Idle]

I have an ExposedDropDownMenu that is extremely laggy delayed when opening. It takes like a good 4 seconds (and yes this happens in release builds too). I have a bunch of items (it's a country picker actually). My idea was "I know lets make it Lazy" but that leads to a crash. Any ideas from anyone?

[Colton Idle]

I'm basically using the example here. But once I wrap it in a Lazy, I get a crash
https://developer.android.com/reference/kotlin/androidx/compose/material/package-summary#DropdownMenu(kotlin.Boolean,[…]Properties,kotlin.Function1)

[Colton Idle]

Untitled.txt

[ryan.fonzi]

Not a perfect solution, but as a workaround you can just keep the dropdown closed on blank inputs. Once they start typing, the list of countries you're dealing with is already massively reduced by filtering.

[Colton Idle]

Ooh. We don't actually support filtering. Just a plain old drop down right now

[Francesc]

I haven't tried this, but what if you specify a height to the ExposedDropDownMenu to satisfy the lazy list requirement?

[Albert Chang]

Use lazy list and give it a fixed width.

[Colton Idle]

Interesting. Can I just use the default width for these things? Or is that the point (that the width changes depending on the item)?

[Albert Chang]

There is no default width. See this thread.

[saket]

I'm curious: do you see any perf difference if you try out cascade?

[Colton Idle]

oooh. I thought cascade was only for like action overflow, not necessarily for your "standard" drop down selector list. If it is in fact for a normal drop down, then I'd love to give it a whirl. love the smooth anims ❤️

[saket]

It's actually not designed to be used as an exposed dropdown but I'm interested in seeing if it's perf is any different 😄.

[Colton Idle]

will give it a try later on!

[Colton Idle]

Circled back to this today and I get the same crash. If I add a height to the lazy column, then I dont crash... but then it doesn't scroll. 😄

Thoughts?

ExposedDropdownMenu(expanded = expanded, onDismissRequest = { expanded = false }) {
    LazyColumn(Modifier.width(100.dp)){
        itemsIndexed(list) { index, selectionOption ->
            DropdownMenuItem(
                onClick = {
                    selected(index)
                    expanded = false
                }) {
                    Text(text = selectionOption)

[ryan.fonzi]

Yep, same here. I wonder if the nested scrolling is doing something weird.

The only other thing I can think of which probably works (but is overkill) is copying the implementation of ExposedDropdownMenu and replacing the use of Column internally with LazyColumn.

[Colton Idle]

@Adam Powell sorry for the ping, but you commented on the previous thread that Albert dropped in here. Do you have any idea how to use an ExposedDropDownMenu with LazyColumn.