Handling keyboard inset for Android sdk < 30

app/src/main/java/org/thoughtcrime/securesms/conversation/start/NewConversationFragment.kt

@@ -27,7 +27,11 @@ import org.thoughtcrime.securesms.groups.JoinCommunityFragment
 @AndroidEntryPoint
 class StartConversationFragment : BottomSheetDialogFragment(), StartConversationDelegate {
 
-    private val defaultPeekHeight: Int by lazy { (Resources.getSystem().displayMetrics.heightPixels * 0.94).toInt() }
+    companion object{
+        const val PEEK_RATIO = 0.94f
+    }
+
+    private val defaultPeekHeight: Int by lazy { (Resources.getSystem().displayMetrics.heightPixels * PEEK_RATIO).toInt() }
 
     override fun onCreateView(
         inflater: LayoutInflater, container: ViewGroup?,

app/src/main/java/org/thoughtcrime/securesms/conversation/start/newmessage/NewMessage.kt

@@ -1,10 +1,13 @@
 package org.thoughtcrime.securesms.conversation.start.newmessage
 
-import androidx.compose.animation.AnimatedVisibility
+import android.graphics.Rect
+import android.os.Build
+import android.view.ViewTreeObserver
 import androidx.compose.foundation.ExperimentalFoundationApi
 import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.consumeWindowInsets
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
@@ -15,23 +18,31 @@ import androidx.compose.foundation.pager.rememberPagerState
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.DisposableEffect
+import androidx.compose.runtime.MutableState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.input.nestedscroll.nestedScroll
+import androidx.compose.ui.platform.LocalDensity
+import androidx.compose.ui.platform.LocalView
+import androidx.compose.ui.platform.rememberNestedScrollInteropConnection
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.tooling.preview.PreviewParameter
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.dp
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.emptyFlow
 import network.loki.messenger.R
-import org.thoughtcrime.securesms.onboarding.ui.ContinuePrimaryOutlineButton
+import org.thoughtcrime.securesms.conversation.start.StartConversationFragment.Companion.PEEK_RATIO
 import org.thoughtcrime.securesms.ui.LoadingArcOr
-import org.thoughtcrime.securesms.ui.theme.LocalDimensions
-import org.thoughtcrime.securesms.ui.theme.PreviewTheme
-import org.thoughtcrime.securesms.ui.theme.SessionColorsParameterProvider
-import org.thoughtcrime.securesms.ui.theme.ThemeColors
-import org.thoughtcrime.securesms.ui.theme.LocalColors
 import org.thoughtcrime.securesms.ui.components.AppBar
 import org.thoughtcrime.securesms.ui.components.BorderlessButtonWithIcon
 import org.thoughtcrime.securesms.ui.components.MaybeScanQrCode
@@ -39,7 +50,13 @@ import org.thoughtcrime.securesms.ui.components.PrimaryOutlineButton
 import org.thoughtcrime.securesms.ui.components.SessionOutlinedTextField
 import org.thoughtcrime.securesms.ui.components.SessionTabRow
 import org.thoughtcrime.securesms.ui.contentDescription
+import org.thoughtcrime.securesms.ui.theme.LocalColors
+import org.thoughtcrime.securesms.ui.theme.LocalDimensions
 import org.thoughtcrime.securesms.ui.theme.LocalType
+import org.thoughtcrime.securesms.ui.theme.PreviewTheme
+import org.thoughtcrime.securesms.ui.theme.SessionColorsParameterProvider
+import org.thoughtcrime.securesms.ui.theme.ThemeColors
+import kotlin.math.max
 
 private val TITLES = listOf(R.string.enter_account_id, R.string.qrScan)
 
@@ -76,11 +93,34 @@ private fun EnterAccountId(
     callbacks: Callbacks,
     onHelp: () -> Unit = {}
 ) {
-    Column(
-        modifier = Modifier
+    // the scaffold is required to provide the contentPadding. That contentPadding is needed
+    // to properly handle the ime padding.
+    Scaffold() { contentPadding ->
+        // we need this extra surface to handle nested scrolling properly,
+        // because this scrollable component is inside a bottomSheet dialog which is itself scrollable
+        Surface(
+            modifier = Modifier.nestedScroll(rememberNestedScrollInteropConnection()),
+            color = LocalColors.current.backgroundSecondary
+        ) {
+
+            var accountModifier = Modifier
                 .fillMaxSize()
                 .verticalScroll(rememberScrollState())
+
+            // There is a known issue with the ime padding on android versions below 30
+            // So we these older versions we need to resort to some manual padding based on the visible height
+            // when the keyboard is up
+            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.R) {
+                val keyboardHeight by keyboardHeight()
+                accountModifier = accountModifier.padding(bottom = keyboardHeight)
+            } else {
+                accountModifier = accountModifier
+                    .consumeWindowInsets(contentPadding)
                     .imePadding()
+            }
+
+            Column(
+                modifier = accountModifier
             ) {
                 Column(
                     modifier = Modifier.padding(vertical = LocalDimensions.current.spacing),
@@ -132,6 +172,33 @@ private fun EnterAccountId(
                 }
             }
         }
+    }
+}
+
+@Composable
+fun keyboardHeight(): MutableState<Dp> {
+    val view = LocalView.current
+    var keyboardHeight = remember { mutableStateOf(0.dp) }
+    val density = LocalDensity.current
+
+    DisposableEffect(view) {
+        val listener = ViewTreeObserver.OnGlobalLayoutListener {
+            val rect = Rect()
+            view.getWindowVisibleDisplayFrame(rect)
+            val screenHeight = view.rootView.height * PEEK_RATIO
+            val keypadHeightPx = max( screenHeight - rect.bottom, 0f)
+
+            keyboardHeight.value = with(density) { keypadHeightPx.toDp() }
+        }
+
+        view.viewTreeObserver.addOnGlobalLayoutListener(listener)
+        onDispose {
+            view.viewTreeObserver.removeOnGlobalLayoutListener(listener)
+        }
+    }
+
+    return keyboardHeight
+}
 
 @Preview
 @Composable