[Jetnews] Showcase PreviewParameterProvider usage.

Author: JolandaVerhoef

JetNews/app/src/debug/java/com/example/jetnews/PostPreviewParameterProvider.kt

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2021 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.example.jetnews
+
+import androidx.compose.ui.tooling.preview.PreviewParameterProvider
+import com.example.jetnews.data.posts.impl.post1
+import com.example.jetnews.data.posts.impl.post2
+import com.example.jetnews.data.posts.impl.post3
+import com.example.jetnews.data.posts.impl.post4
+import com.example.jetnews.data.posts.impl.post5
+import com.example.jetnews.model.Post
+
+class PostPreviewParameterProvider : PreviewParameterProvider<Post> {
+ override val values = sequenceOf(
+ post1, post2, post3, post4, post5
+ )
+}

JetNews/app/src/main/java/com/example/jetnews/ui/home/PostCardYourNetwork.kt

@@ -35,9 +35,10 @@ import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.tooling.preview.PreviewParameter
 import androidx.compose.ui.unit.dp
+import com.example.jetnews.PostPreviewParameterProvider
 import com.example.jetnews.R
-import com.example.jetnews.data.posts.impl.post1
 import com.example.jetnews.model.Post
 import com.example.jetnews.model.PostAuthor
 import com.example.jetnews.ui.theme.JetnewsTheme
@@ -95,17 +96,17 @@ fun PostCardPopular(
 @Preview("Regular colors")
 @Preview("Dark colors", uiMode = UI_MODE_NIGHT_YES)
 @Composable
-fun PreviewPostCardPopular() {
+fun PreviewPostCardPopular(@PreviewParameter(PostPreviewParameterProvider::class, limit = 1) post: Post) {
  JetnewsTheme {
  Surface {
- PostCardPopular(post1, {})
+ PostCardPopular(post, {})
  }
  }
 }
 
 @Preview("Regular colors, long text")
 @Composable
-fun PreviewPostCardPopularLongText() {
+fun PreviewPostCardPopularLongText(@PreviewParameter(PostPreviewParameterProvider::class, limit = 1) post: Post) {
  val loremIpsum =
  """
  Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras ullamcorper pharetra massa,
@@ -118,9 +119,9 @@ fun PreviewPostCardPopularLongText() {
  JetnewsTheme {
  Surface {
  PostCardPopular(
- post1.copy(
+ post.copy(
  title = "Title$loremIpsum",
- metadata = post1.metadata.copy(
+ metadata = post.metadata.copy(
  author = PostAuthor("Author: $loremIpsum"),
  readTimeMinutes = Int.MAX_VALUE
  )