kotlinlang #compose

the modal, it expands to only cover half the screen height. I have to swipe-up to pull it to make it expand to cover the entire screen. What did I miss?

Piotr Prus

01/26/2021, 4:10 PM

I am trying to make a bottomSheet that opens over mapView. Very similar to current behaviour of google maps. I have a problem with moving the map to the click location. Probably because BottomSheet opens over the map and not resize the mapview. When I move the map, it moves below. I am using

BottomSheetScaffold

. Is it a right component to use here? I put my detail data in

sheetContent

and mapView in

bodyContent

. Any idea how to deal with it? example behaviour: https://streamable.com/balbx

Dirk Hoffmann

01/26/2021, 10:36 PM

after upgrading lib versions I get weird compiler error on

Icon(Icons.Filled...)

kotlin 1.4.21-2 compose 0.3.0-build143

import androidx.compose.material.Icon
import androidx.compose.material.IconButton
import androidx.compose.material.icons.Icons

...

        IconButton(onClick = { /* doSomething() */ }) {
            Icon(Icons.Filled.Lock)
        }

None of the following functions can be called with the arguments supplied: 
public fun Icon(bitmap: ImageBitmap, contentDescription: String?, modifier: Modifier = ..., tint: Color = ...): Unit defined in androidx.compose.material
public fun Icon(painter: Painter, contentDescription: String?, modifier: Modifier = ..., tint: Color = ...): Unit defined in androidx.compose.material
public fun Icon(imageVector: ImageVector, contentDescription: String?, modifier: Modifier = ..., tint: Color = ...): Unit defined in androidx.compose.material

any ideas?

Kshitij Patil

01/27/2021, 4:44 AM

Is there compose release today?

Chethan

01/27/2021, 4:56 AM

Do we have some thing similar to switch map for mutable state flow . I want to trigger network calls only some values changes ?

Jason Ankers

01/27/2021, 6:53 AM

Is it possible to create animations based on scroll position in compose? I want a background to fade away while the list scrolls

allan.conda

01/27/2021, 7:05 AM

We’re getting crashes only for minified builds… Any idea how I could go about debugging this issue?

Untitled

julioromano

01/27/2021, 7:39 AM

Does compose offer something similar to

android:animateLayoutChanges="true"

allan.conda

01/27/2021, 11:51 AM

Anyone had to debounce onClick lambdas yet in Compose? Or immediately disable a button to prevent multiple clicks. We hoisted the state into the ViewModel and there’s a gap where the user can still click the button again before it gets disabled. Been trying to think of ways to handle this.

Kshitij Patil

01/27/2021, 12:30 PM

Modifier.navigationBarsWithImePadding()

Modifier.imePadding()

from

accompanist-insets

does not apply to

ConstraintLayout

. Is this a bug or am I doing something wrong? Compose:

1.0.0-alpha10

accompanist:

0.4.2

Francois Morvillier

01/27/2021, 2:35 PM

I have a @Composable I want to be called at regular intervals (for instance once a second) to display some debug info. What's the best way to achieve this?

Kshitij Patil

01/27/2021, 2:51 PM

Losing focus from a TextField and refocusing it triggers

OnValueChange

event even with no change in its Text. Is this expected behaviour?

Kshitij Patil

01/27/2021, 4:24 PM

I’ve observed one more issue which I didn’t discuss broadly here. When we change the Text of TextFieldValue from any external effect, say a button click sets some text value for TextField, this doesn’t change the cursor position. Ideally the cursor should be set to end of the set Text. Is there any way I can handle this programmatically? I’m aware of

OffsetMapping

for

VisualTransformation

but this isn’t available for the use-case I mentioned.

Marko Novakovic

01/27/2021, 5:57 PM

what does this error means?

Reading a state that was created after the snapshot was taken or in a snapshot that has not yet been applied

grandstaish

01/27/2021, 6:55 PM

Does anyone have an idea why

detectTapGestures

might not detect taps when there’s an ongoing animation on the screen? I have a separate

pointerInput

modifier that just logs input events, and both the down&up events are being logged. Once the animation completes, taps are detected fine again. I also added a log to check that my composable wasn’t being re-composed on every frame of the animation, but it doesn’t seem to be 🤔

krzysztof

01/27/2021, 7:53 PM

I have a problem getting

Preview

to show up - It worked previously (version

alpha07

), now with

alpha08

from

androidx.compose.ui:ui-tooling

is giving me error:

androidx.ui.tooling.preview.PreviewActivity is not an Activity subclass or alias

Utkarsh Tiwari

01/28/2021, 2:10 AM

I am facing an issue when I am trying to show two different kinds of Modals in the same screen. I need to tap the button twice to show the dialog. Seems like I am not handling the states right. Any suggestions?

Kyant

01/28/2021, 2:55 AM

Are there any examples of transition v2? The new API changes a lot.

chris-horner

01/28/2021, 4:16 AM

Is there a neat way to animate the

weight

of an item in a

Column

down to 0? Seems a little tricky as weights must have a value greater than 0. Am I missing something?

darkmoon_uk

01/28/2021, 4:18 AM

I'm

@Compose

-ing views that are dependent on bundled resources at runtime; so these fail during preview. Is there a way I can check whether I'm running in
@Preview
mode in the composition, so that I can just put colored block instead of the asset?

linus muema

01/28/2021, 7:35 AM

Hi, Is there a way to create a blur on the background of a

Box

like the "Log In" and "Sign Up" buttons below 🤔

rsktash

01/28/2021, 7:57 AM

Hi Is there a better way to prevent double click? disable logic not implemented yet

julioromano

01/28/2021, 8:25 AM

I can’t run a preview on a device anymore: the “Deploy preview” button is greyed out and the similar icons in the gutter are gone too. (Using Arctic Fox Canary 5) I don’t know if some setting is disabling this and which it may be.

✅ 1

Shakil Karim

01/28/2021, 8:34 AM

I have Multiple screens as Composable like HomeScreen, DashboardScreen, etc and all of them has it's own ViewModel e.g HomeViewModel and I'm using ViewModel as

val viewModel: HomeViewModel = viewModel()

in each screen, Do these ViewModels remain in memory all the time because I'm using a Single Activity? and I'm not using Navigation Component

Dejan Predovic

01/28/2021, 9:55 AM

I just updates AS and AGP to alpha05 and Compose compiler throws:

Archie

01/28/2021, 10:10 AM

Is there a way to ensure that a composable would always be square? So that regardless what the size of its content, the Width or Height would always be equal? I tried:

modifier.layout { measurable, constraints ->
    val placeable = measurable.measure(constraints)

    val wrapperWidth = placeable.width.coerceIn(constraints.minWidth, constraints.maxWidth)
    val wrapperHeight = placeable.height.coerceIn(constraints.minHeight, constraints.maxHeight)
    val size = wrapperWidth.coerceAtLeast(wrapperHeight)
    layout(size, size) {
        placeable.placeRelative(0, 0)
    }
}

But I am only altering the position here since I already measured the placeable. Any hints?

pawegio

01/28/2021, 11:33 AM

I’ve noticed that

kotlinCompilerVersion

composeOptions

got deprecated in recent android gradle api, but removing it generates
IncompatibleComposeRuntimeVersionException
. 🤔 ~~What’s the proper way to migrate?~~

@Deprecated("")
var kotlinCompilerVersion: String?

Timo Drick

01/28/2021, 1:13 PM

I think i found a bug. Not sure. But i do have a modifier that swipes away an element in a list and than removes the item from the list. This modifier remembers the state that the element is removed. Than when i remove the element from the list it looks like that the next element gets the state of this modifier. When i use the key() {} code it works fine.

LazyColumn {
    items(modelList) { item ->
        //key(item) { // with key it works fine
            Box(Modifier.swipeToRemove(onRemoved = {
                modelList.remove(item)
            })) {
                Item(item = item)
            }
        //}
    }
}

device-2021-01-28-140519.mp4

Timo Drick

01/28/2021, 3:04 PM

I do want to filter a SnapshotStateList and than use the filtered list in a LazyColumn. How can i do it? Using this code does not work because it does not detect changes in the list and do not filter the list again:

val list = remember(snapshotStateList) {
    snapshotStateList.filter { removed.contains(it).not() }
}

Zach Klippenstein (he/him) [MOD]

01/28/2021, 4:59 PM

I see that

AbstractComposeView

, when creating its composition, looks up the view tree for a

CompositionReference

using

findViewTreeCompositionReference()

. This seems really neat, since it could enable

ComposeView -> AndroidView -> … -> ComposeView

hierarchies to automatically link their compositions. However, as far as I can tell,

AndroidView

never actually sets the view tree

CompositionReference

from the calling composition on its

View

, and this whole mechanism seems to currently only be used to find the

WindowRecomposer

. Would it be feasible for every

AndroidView

call to get a

CompositionReference

and set it on its

View

to support this? Is this sort of automatic linking of compositions across android view subtrees even something that would make sense? If yes, is the

AndroidView

wiring planned? https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:compose/ui/ui/src/androidMain/kotlin/androidx/compose/ui/platform/ComposeView.kt;drc=a32c0003449e3ca6141ef497f0ee2759b41943ba;l=176

Title

Zach Klippenstein (he/him) [MOD]

01/28/2021, 4:59 PM

I see that

AbstractComposeView

, when creating its composition, looks up the view tree for a

CompositionReference

using

findViewTreeCompositionReference()

. This seems really neat, since it could enable

ComposeView -> AndroidView -> … -> ComposeView

hierarchies to automatically link their compositions. However, as far as I can tell,

AndroidView

never actually sets the view tree

CompositionReference

from the calling composition on its

View

, and this whole mechanism seems to currently only be used to find the

WindowRecomposer

. Would it be feasible for every

AndroidView

call to get a

CompositionReference

and set it on its

View

to support this? Is this sort of automatic linking of compositions across android view subtrees even something that would make sense? If yes, is the

AndroidView

IIRC, at least a couple releases ago, for subcomposition to work the subcomposition had to be manually composed every time the

CompositionReference

was composed, and so if that’s still the case then this simple view tree mechanism lacks the ability to push those recompose events down and this wouldn’t work.

I’m asking because I work on a navigation library where we currently manually implement this sort of nested composition linking through our own, non-view-tag-based mechanism, and it works but it only works if the boundary between compose and android views is controlled by the library. This is a restriction I think we’re ok living with, but if this were something that Compose just supported automatically, it would be great for two reasons: we could delete a bunch of code, and it would work across any Compose/Android view boundaries, not just the ones we control.

Adam Powell

01/28/2021, 5:33 PM

hmm, yeah we could do that

🎉 2

Leland Richardson [G]

01/28/2021, 5:42 PM

thanks for the idea zach!

🙏 1

➕ 1

Zach Klippenstein (he/him) [MOD]

01/28/2021, 7:01 PM

I think it should be pretty straightforward, i can try to get a CL up probably next week

Adam Powell

01/28/2021, 7:31 PM

oh I'm halfway through it now, I'm just writing a test for it

🎉 3

https://android-review.googlesource.com/c/platform/frameworks/support/+/1564002

🙏 1

Vinay Gaba

01/28/2021, 9:27 PM

I only read Zach’s comments once (and maybe I should read it a few times) but if I understood this correctly, does this change enable the possibility of introducing a mechanism to propagate recompositions through AndroidView such that ComposeView -> AndroidView -> ComposeView hierarchies have “interlinked” compositions. Does this also come with any performance wins?

Zach Klippenstein (he/him) [MOD]

01/28/2021, 9:29 PM

It doesn’t just enable the possibility of introducing such a mechanism, it is the mechanism.

😄 2

☝️ 1

zsperske

02/01/2021, 1:01 AM

great stuff! it's so cool to see such an interactive dev team/community relationship

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