Custom GlanceAppWidgetHostPreview for ExperimentalPagerApi

GlanceAppWidgetHostPreview.kt

import android.appwidget.AppWidgetProviderInfo
import androidx.compose.foundation.clickable
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.rememberCoroutineScope
import androidx.compose.ui.Modifier
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.unit.DpSize
import androidx.glance.appwidget.ExperimentalGlanceRemoteViewsApi
import androidx.glance.appwidget.GlanceAppWidget
import com.google.android.glance.appwidget.host.AppWidgetHost
import com.google.android.glance.appwidget.host.glance.compose
import com.google.android.glance.appwidget.host.rememberAppWidgetHostState
import kotlinx.coroutines.delay
import kotlinx.coroutines.launch

@ExperimentalGlanceRemoteViewsApi
@Composable
fun GlanceAppWidgetHostPreview(
    glanceAppWidget: GlanceAppWidget,
    modifier: Modifier = Modifier,
    state: Any? = null,
    displaySize: DpSize = DpSize.Unspecified,
    provider: AppWidgetProviderInfo? = null
) {
    val hostState = rememberAppWidgetHostState(provider)
    val scope = rememberCoroutineScope()
    val context = LocalContext.current

    suspend fun updateContent() {
        hostState.updateAppWidget(glanceAppWidget.compose(context, displaySize, state, provider))
    }

    if (hostState.isReady) {
        LaunchedEffect(hostState.value) {
            delay(100)
            updateContent()
        }
    }

    AppWidgetHost(
        modifier = Modifier.clickable {
            scope.launch {
                updateContent()
            }
        }.then(modifier),
        displaySize = displaySize,
        state = hostState
    )
}

see also google/glance-experimental-tools#7