UIC-761 : Added a debounce logic for sample app

Author: pacific-ring

app/src/main/java/com/auth0/android/sample/ui/components/SampleTopBar.kt

@@ -18,6 +18,7 @@ import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.painter.Painter
 import androidx.compose.ui.text.TextStyle
 import androidx.compose.ui.unit.dp
+import com.auth0.android.sample.ui.util.rememberDebouncedOnClick
 import com.auth0.universalcomponents.theme.Auth0Theme
 
 @OptIn(ExperimentalMaterial3Api::class)
@@ -50,7 +51,8 @@ fun SampleTopBar(
             },
             navigationIcon = {
                 if (showBackNavigation) {
-                    IconButton(onClick = onBackClick) {
+                    val debouncedOnBackClick = rememberDebouncedOnClick(onClick = onBackClick)
+                    IconButton(onClick = debouncedOnBackClick) {
                         Icon(
                             imageVector = Icons.AutoMirrored.Filled.ArrowBack,
                             contentDescription = "Navigate back",

app/src/main/java/com/auth0/android/sample/ui/screens/EmbeddedLoginScreen.kt

@@ -41,6 +41,7 @@ import com.auth0.android.sample.ui.components.OrDivider
 import com.auth0.android.sample.ui.theme.auth0ScreenBackground
 import com.auth0.android.sample.ui.theme.isAuth0DarkTheme
 import com.auth0.android.sample.ui.components.SampleGradientButton
+import com.auth0.android.sample.ui.util.rememberDebouncedOnClick
 import com.auth0.universalcomponents.theme.Auth0Theme
 
 /**
@@ -82,7 +83,8 @@ fun EmbeddedLoginScreen(
         horizontalAlignment = Alignment.CenterHorizontally
     ) {
         Row(modifier = Modifier.fillMaxWidth()) {
-            IconButton(onClick = onBack) {
+            val debouncedOnBack = rememberDebouncedOnClick(onClick = onBack)
+            IconButton(onClick = debouncedOnBack) {
                 Icon(
                     imageVector = Icons.AutoMirrored.Filled.ArrowBack,
                     contentDescription = "Back",

app/src/main/java/com/auth0/android/sample/ui/util/ClickDebounce.kt

@@ -0,0 +1,30 @@
+package com.auth0.android.sample.ui.util
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberUpdatedState
+
+/**
+ * Wraps [onClick] so it fires at most once per [windowMs]. Compose can dispatch several queued taps
+ * within the same frame, before recomposition removes the composable; for back navigation that
+ * over-pops past the start destination and leaves an empty NavHost (blank screen). Letting only the
+ * first tap of a burst through avoids that.
+ */
+@Composable
+internal fun rememberDebouncedOnClick(
+    windowMs: Long = 500L,
+    onClick: () -> Unit
+): () -> Unit {
+    val latestOnClick by rememberUpdatedState(onClick)
+    return remember(windowMs) {
+        var lastClickMs = 0L
+        {
+            val now = System.currentTimeMillis()
+            if (now - lastClickMs >= windowMs) {
+                lastClickMs = now
+                latestOnClick()
+            }
+        }
+    }
+}