adding NiaApp layout preview

app/build.gradle.kts

@@ -86,6 +86,7 @@ dependencies {
     implementation(project(":core:ui"))
     implementation(project(":core:designsystem"))
     implementation(project(":core:navigation"))
+    implementation(project(":core:model"))
 
     implementation(project(":sync:work"))
     implementation(project(":sync:sync-test"))

app/src/main/java/com/google/samples/apps/nowinandroid/ui/NiaApp.kt

@@ -14,8 +14,15 @@
  * limitations under the License.
  */
 
+@file:OptIn(
+    ExperimentalMaterial3Api::class,
+    ExperimentalLayoutApi::class,
+    ExperimentalComposeUiApi::class, ExperimentalMaterial3WindowSizeClassApi::class
+)
+
 package com.google.samples.apps.nowinandroid.ui
 
+import androidx.compose.foundation.layout.BoxWithConstraints
 import androidx.compose.foundation.layout.ExperimentalLayoutApi
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.WindowInsets
@@ -32,15 +39,21 @@ import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Text
+import androidx.compose.material3.windowsizeclass.ExperimentalMaterial3WindowSizeClassApi
 import androidx.compose.material3.windowsizeclass.WindowSizeClass
+import androidx.compose.material3.windowsizeclass.WindowSizeClass.Companion
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.ExperimentalComposeUiApi
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.platform.LocalConfiguration
+import androidx.compose.ui.platform.LocalInspectionMode
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.semantics.testTagsAsResourceId
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.DpSize
 import androidx.navigation.NavDestination
 import androidx.navigation.NavDestination.Companion.hierarchy
 import com.google.samples.apps.nowinandroid.core.designsystem.component.NiaBackground
@@ -52,15 +65,20 @@ import com.google.samples.apps.nowinandroid.core.designsystem.component.NiaNavig
 import com.google.samples.apps.nowinandroid.core.designsystem.icon.Icon.DrawableResourceIcon
 import com.google.samples.apps.nowinandroid.core.designsystem.icon.Icon.ImageVectorIcon
 import com.google.samples.apps.nowinandroid.core.designsystem.theme.NiaTheme
+import com.google.samples.apps.nowinandroid.core.model.data.FollowableAuthor
+import com.google.samples.apps.nowinandroid.core.model.data.FollowableTopic
+import com.google.samples.apps.nowinandroid.core.model.data.SaveableNewsResource
+import com.google.samples.apps.nowinandroid.core.model.data.previewAuthors
+import com.google.samples.apps.nowinandroid.core.model.data.previewNewsResources
+import com.google.samples.apps.nowinandroid.core.model.data.previewTopics
+import com.google.samples.apps.nowinandroid.core.ui.NewsFeedUiState.Success
+import com.google.samples.apps.nowinandroid.core.ui.ReferenceDevicePreviews
+import com.google.samples.apps.nowinandroid.feature.foryou.ForYouInterestsSelectionUiState.WithInterestsSelection
+import com.google.samples.apps.nowinandroid.feature.foryou.ForYouScreen
 import com.google.samples.apps.nowinandroid.feature.foryou.navigation.ForYouDestination
 import com.google.samples.apps.nowinandroid.navigation.NiaNavHost
 import com.google.samples.apps.nowinandroid.navigation.TopLevelDestination
 
-@OptIn(
-    ExperimentalMaterial3Api::class,
-    ExperimentalLayoutApi::class,
-    ExperimentalComposeUiApi::class
-)
 @Composable
 fun NiaApp(
     windowSizeClass: WindowSizeClass,
@@ -109,14 +127,41 @@ fun NiaApp(
                         )
                     }
 
-                    NiaNavHost(
-                        navController = appState.navController,
-                        onBackClick = appState::onBackClick,
-                        onNavigateToDestination = appState::navigate,
-                        modifier = Modifier
-                            .padding(padding)
-                            .consumedWindowInsets(padding)
-                    )
+                    if(!LocalInspectionMode.current)
+                    {
+                        NiaNavHost(
+                            navController = appState.navController,
+                            onBackClick = appState::onBackClick,
+                            onNavigateToDestination = appState::navigate,
+                            modifier = Modifier
+                                .padding(padding)
+                                .consumedWindowInsets(padding)
+                        )
+                    }
+                    else
+                    {
+                        BoxWithConstraints {
+                            NiaTheme {
+                                ForYouScreen(
+                                    isOffline = false,
+                                    isSyncing = false,
+                                    interestsSelectionState = WithInterestsSelection(
+                                        topics = previewTopics.map { FollowableTopic(it, false) },
+                                        authors = previewAuthors.map { FollowableAuthor(it, false) }
+                                    ),
+                                    feedState = Success(
+                                        feed = previewNewsResources.map {
+                                            SaveableNewsResource(it, false)
+                                        }
+                                    ),
+                                    onTopicCheckedChanged = { _, _ -> },
+                                    onAuthorCheckedChanged = { _, _ -> },
+                                    saveFollowedTopics = {},
+                                    onNewsResourcesCheckedChanged = { _, _ -> }
+                                )
+                            }
+                        }
+                    }
                 }
             }
         }
@@ -195,3 +240,11 @@ private fun NiaBottomBar(
         }
     }
 }
+@ReferenceDevicePreviews
+@Composable
+fun NiaAppLayoutPreview(){
+    val widthDp = Dp(LocalConfiguration.current.screenWidthDp.toFloat())
+    val heightDp = Dp(LocalConfiguration.current.screenHeightDp.toFloat())
+    val windowSizeClass = WindowSizeClass.calculateFromSize(DpSize(widthDp, heightDp))
+    NiaApp(windowSizeClass = windowSizeClass)
+}

core/ui/src/main/java/com/google/samples/apps/nowinandroid/core/ui/DevicePreviews.kt

@@ -18,6 +18,15 @@ package com.google.samples.apps.nowinandroid.core.ui
 
 import androidx.compose.ui.tooling.preview.Preview
 
+/**
+ * Multipreview annotation the maps to the Android Studio reference devices.
+ */
+@Preview(name = "1_phone", device = Devices.PHONE)
+@Preview(name = "2_foldable", device = Devices.FOLDABLE)
+@Preview(name = "3_tablet", device = Devices.TABLET)
+@Preview(name = "4_desktop", device = Devices.DESKTOP)
+annotation class ReferenceDevicePreviews
+
 /**
  * Multipreview annotation that represents various device sizes. Add this annotation to a composable
  * to render various devices.

core/ui/src/main/java/com/google/samples/apps/nowinandroid/core/ui/ReferenceDevices.kt

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ *   Licensed under the Apache License, Version 2.0 (the "License");
+ *   you may not use this file except in compliance with the License.
+ *   You may obtain a copy of the License at
+ *
+ *       https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *   Unless required by applicable law or agreed to in writing, software
+ *   distributed under the License is distributed on an "AS IS" BASIS,
+ *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *   See the License for the specific language governing permissions and
+ *   limitations under the License.
+ */
+
+package com.google.samples.apps.nowinandroid.core.ui
+
+import androidx.compose.ui.tooling.preview.Preview
+
+import androidx.annotation.StringDef
+
+/**
+ * List with the pre-defined devices available to be used in the preview.
+ */
+object Devices {
+
+    // Reference devices
+    const val PHONE = "spec:shape=Normal,width=411,height=891,unit=dp,dpi=420"
+    const val FOLDABLE = "spec:shape=Normal,width=673,height=841,unit=dp,dpi=420"
+    const val TABLET = "spec:shape=Normal,width=1280,height=800,unit=dp,dpi=420"
+    const val DESKTOP = "spec:shape=Normal,width=1920,height=1080,unit=dp,dpi=420"
+}
+
+/**
+ * Annotation for defining the [Preview] device to use.
+ * @suppress
+ */
+@Retention(AnnotationRetention.SOURCE)
+@StringDef(
+    open = true,
+    value = [
+        Devices.PHONE,
+        Devices.FOLDABLE,
+        Devices.TABLET,
+        Devices.DESKTOP,
+    ]
+)
+annotation class Device