Add example for HorizontalPager to the test application

tests/application/src/main/java/dev/enro/tests/application/compose/HorizontalPager.kt

@@ -0,0 +1,107 @@
+package dev.enro.tests.application.compose
+
+import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.pager.HorizontalPager
+import androidx.compose.foundation.pager.rememberPagerState
+import androidx.compose.material.Button
+import androidx.compose.material.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import dev.enro.annotations.NavigationDestination
+import dev.enro.core.NavigationKey
+import dev.enro.core.compose.container.rememberNavigationContainerGroup
+import dev.enro.core.compose.navigationHandle
+import dev.enro.core.compose.rememberNavigationContainer
+import dev.enro.core.container.EmptyBehavior
+import dev.enro.core.container.accept
+import dev.enro.core.push
+import dev.enro.tests.application.compose.common.TitledColumn
+import kotlinx.parcelize.Parcelize
+
+@Parcelize
+object HorizontalPager : NavigationKey.SupportsPush {
+    @Parcelize
+    internal class PageOne(val name: String) : NavigationKey.SupportsPush
+
+    @Parcelize
+    internal class PageTwo(val name: String) : NavigationKey.SupportsPush
+}
+
+@OptIn(ExperimentalFoundationApi::class)
+@NavigationDestination(HorizontalPager::class)
+@Composable
+fun HorizontalPagerCrossFadeScreen() {
+    val pageOne = rememberNavigationContainer(
+        root = HorizontalPager.PageOne("Root"),
+        emptyBehavior = EmptyBehavior.CloseParent,
+        filter = accept { key<HorizontalPager.PageOne>() }
+    )
+    val pageTwo = rememberNavigationContainer(
+        root = HorizontalPager.PageTwo("Root"),
+        emptyBehavior = EmptyBehavior.CloseParent,
+        filter = accept { key<HorizontalPager.PageTwo>() }
+    )
+    val containerGroup = rememberNavigationContainerGroup(pageOne, pageTwo)
+    val state = rememberPagerState { containerGroup.containers.size }
+    LaunchedEffect(containerGroup.activeContainer) {
+        val target = when (containerGroup.activeContainer) {
+            pageOne -> 0
+            else -> 1
+        }
+        if (target != state.currentPage) {
+            state.animateScrollToPage(target)
+        }
+    }
+    HorizontalPager(state = state) { page ->
+        containerGroup.containers[page].Render()
+    }
+}
+
+@NavigationDestination(HorizontalPager.PageOne::class)
+@Composable
+fun HorizontalPagerCrossFadePageOneScreen() {
+    val navigation = navigationHandle<HorizontalPager.PageOne>()
+    TitledColumn(title = "Page One") {
+        Text(text = "Id: ${navigation.key.name}")
+        Button(
+            onClick = {
+                navigation.push(HorizontalPager.PageOne((navigation.key.name.toIntOrNull() ?: 0).plus(1).toString()))
+            }
+        ) {
+            Text(text = "Next Page (one)")
+        }
+        Button(
+            onClick = {
+                navigation.push(HorizontalPager.PageTwo((navigation.key.name.toIntOrNull() ?: 0).plus(1).toString()))
+            }
+        ) {
+            Text(text = "Next Page (two)")
+        }
+    }
+}
+
+
+@NavigationDestination(HorizontalPager.PageTwo::class)
+@Composable
+fun HorizontalPagerCrossFadePageTwoScreen() {
+    val navigation = navigationHandle<HorizontalPager.PageTwo>()
+    TitledColumn(title = "Page Two") {
+        Text(text = "Id: ${navigation.key.name}")
+        Button(
+            onClick = {
+                navigation.push(HorizontalPager.PageOne((navigation.key.name.toIntOrNull() ?: 0).plus(1).toString()))
+            }
+        ) {
+            Text(text = "Next Page (one)")
+        }
+        Button(
+            onClick = {
+                navigation.push(HorizontalPager.PageTwo((navigation.key.name.toIntOrNull() ?: 0).plus(1).toString()))
+            }
+        ) {
+            Text(text = "Next Page (two)")
+        }
+    }
+}
+
+