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Accessibility in Jetpack Compose  |  Android Developers

 2 years ago
source link: https://developer.android.com/codelabs/jetpack-compose-accessibility
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Accessibility in Jetpack Compose  |  Android Developers
$ git clone https://github.com/googlecodelabs/android-compose-codelabs

@Composable
fun PostCardHistory(post: Post, navigateToArticle: (String) -> Unit) {
   // ...

   Row(
       // ...
   ) {
       // ...
       CompositionLocalProvider(LocalContentAlpha provides ContentAlpha.medium) {
           Icon(
               imageVector = Icons.Default.Close,
               contentDescription = stringResource(R.string.cd_show_fewer),
               modifier = Modifier
                   .clickable { openDialog = true }
                   .size(24.dp)
           )
       }
   }
   // ...
}

@Composable
fun PostCardHistory(post: Post, navigateToArticle: (String) -> Unit) {
   // ...
   Row(
       // ...
   ) {
       // ...
       CompositionLocalProvider(LocalContentAlpha provides ContentAlpha.medium) {
           Icon(
               imageVector = Icons.Default.Close,
               contentDescription = stringResource(R.string.cd_show_fewer),
               modifier = Modifier
                   .clickable { openDialog = true }
                   .padding(12.dp)
                   .size(24.dp)
           )
       }
   }
   // ...
}

@Composable
fun PostCardHistory(post: Post, navigateToArticle: (String) -> Unit) {
   // ...
   Row(
       // ...
   ) {
       // ...
       CompositionLocalProvider(LocalContentAlpha provides ContentAlpha.medium) {
           IconButton(onClick = { openDialog = true }) {
               Icon(
                   imageVector = Icons.Default.Close,
                   contentDescription = stringResource(R.string.cd_show_fewer)
               )
           }
       }
   }
   // ...
}

@Composable
fun PostCardHistory(
   // ...
) {
   Row(
       Modifier.clickable { navigateToArticle(post.id) }
   ) {
       // ...
   }
}

@Composable
fun PostCardHistory(
   // ...
) {
   Row(
       Modifier.clickable(
               // R.string.action_read_article = "read article"
               onClickLabel = stringResource(R.string.action_read_article)
           ) {
               navigateToArticle(post.id)
           }
   ) {
       // ...
   }
}

@Composable
fun PostCardPopular(
   // ...
) {
   Card(
       shape = MaterialTheme.shapes.medium,
       modifier = modifier.size(280.dp, 240.dp),
       onClick = { navigateToArticle(post.id) }
   ) {
       // ...
   }
}

@OptIn(ExperimentalMaterialApi::class)
@Composable
fun PostCardPopular(
   post: Post,
   navigateToArticle: (String) -> Unit,
   modifier: Modifier = Modifier
) {
   Card(
       shape = MaterialTheme.shapes.medium,
       modifier = modifier.size(280.dp, 240.dp),
       onClick = { navigateToArticle(post.id) },
       onClickLabel = stringResource(id = R.string.action_read_article)
   ) {
       // ...
   }
}

@Composable
fun PostCardHistory(post: Post, navigateToArticle: (String) -> Unit) {
   // ...
   Row(
       Modifier.clickable(
           onClickLabel = stringResource(R.string.action_read_article)
       ) {
           navigateToArticle(post.id)
       }
   ) {
       // ...
       CompositionLocalProvider(LocalContentAlpha provides ContentAlpha.medium) {
           IconButton(onClick = { openDialog = true }) {
               Icon(
                   imageVector = Icons.Default.Close,
                   contentDescription = stringResource(R.string.cd_show_fewer)
               )
           }
       }
   }
   // ...
}

@Composable
fun PostCardHistory(post: Post, navigateToArticle: (String) -> Unit) {
   // ...
   Row(
       Modifier.clickable(
           onClickLabel = stringResource(R.string.action_read_article)
       ) {
           navigateToArticle(post.id)
       }
   ) {
       // ...
       CompositionLocalProvider(LocalContentAlpha provides ContentAlpha.medium) {
            IconButton(
                modifier = Modifier.clearAndSetSemantics { },
                onClick = { openDialog = true }
            ) {
                Icon(
                    imageVector = Icons.Default.Close,
                    contentDescription = stringResource(R.string.cd_show_fewer)
                )
            }
       }
   }
   // ...
}

@Composable
fun PostCardHistory(post: Post, navigateToArticle: (String) -> Unit) {
   // ...
   val showFewerLabel = stringResource(R.string.cd_show_fewer)
   Row(
        Modifier
            .clickable(
                onClickLabel = stringResource(R.string.action_read_article)
            ) {
                navigateToArticle(post.id)
            }
            .semantics {
                customActions = listOf(
                    CustomAccessibilityAction(
                        label = showFewerLabel,
                        // action returns boolean to indicate success
                        action = { openDialog = true; true }
                    )
                )
            }
   ) {
       // ...
       CompositionLocalProvider(LocalContentAlpha provides ContentAlpha.medium) {
            IconButton(
                modifier = Modifier.clearAndSetSemantics { },
                onClick = { openDialog = true }
            ) {
                Icon(
                    imageVector = Icons.Default.Close,
                    contentDescription = stringResource(R.string.cd_show_fewer)
                )
            }
       }
   }
   // ...
}

@Composable
fun ArticleScreen(
   // ...
) {
   // ...
   Scaffold(
       topBar = {
           InsetAwareTopAppBar(
               title = {
                   // ...
               },
               navigationIcon = {
                   IconButton(onClick = onBack) {
                       Icon(
                           imageVector = Icons.Filled.ArrowBack,
                           contentDescription = null
                       )
                   }
               }
           )
       }
   ) { 
       // ...
   }
}

@Composable
fun ArticleScreen(
   // ...
) {
   // ...
   Scaffold(
       topBar = {
           InsetAwareTopAppBar(
               title = {
                   // ...
               },
               navigationIcon = {
                   IconButton(onClick = onBack) {
                       Icon(
                           imageVector = Icons.Filled.ArrowBack,
                           contentDescription = stringResource(
                               R.string.cd_navigate_up
                           )
                       )
                   }
               }
           )
       }
   ) { 
       // ...
   }
}

@Composable
private fun Paragraph(paragraph: Paragraph) {
   // ...
   Box(modifier = Modifier.padding(bottom = trailingPadding)) {
       when (paragraph.type) {
           // ...
           ParagraphType.Header -> {
               Text(
                   modifier = Modifier.padding(4.dp),
                   text = annotatedString,
                   style = textStyle.merge(paragraphStyle)
               )
           }
           // ...
       }
   }
}

@Composable
private fun Paragraph(paragraph: Paragraph) {
   // ...
   Box(modifier = Modifier.padding(bottom = trailingPadding)) {
       when (paragraph.type) {
           // ...
           ParagraphType.Header -> {
               Text(
                   modifier = Modifier.padding(4.dp)
                     .semantics { heading() },
                   text = annotatedString,
                   style = textStyle.merge(paragraphStyle)
               )
           }
           // ...
       }
   }
}

@Composable
private fun PostMetadata(metadata: Metadata) {
   // ...
   Row {
       Image(
           // ...
       )
       Spacer(Modifier.width(8.dp))
       Column {
           Text(
               // ...
           )

           CompositionLocalProvider(LocalContentAlpha provides ContentAlpha.medium) {
               Text(
                   // ..
               )
           }
       }
   }
}

@Composable
private fun PostMetadata(metadata: Metadata) {
   // ...
   Row(Modifier.semantics(mergeDescendants = true) {}) {
       Image(
           // ...
       )
       Spacer(Modifier.width(8.dp))
       Column {
           Text(
               // ...
           )

           CompositionLocalProvider(LocalContentAlpha provides ContentAlpha.medium) {
               Text(
                   // ..
               )
           }
       }
   }
}

@Composable
private fun TopicItem(itemTitle: String, selected: Boolean, onToggle: () -> Unit) {
   // ...
   Row(
       modifier = Modifier
           .padding(horizontal = 16.dp, vertical = 8.dp)
   ) {
       // ...
       Checkbox(
           checked = selected,
           onCheckedChange = { onToggle() },
           modifier = Modifier.align(Alignment.CenterVertically)
       )
   }
}

@Composable
private fun TopicItem(itemTitle: String, selected: Boolean, onToggle: () -> Unit) {
   // ...
   Row(
       modifier = Modifier
           .toggleable(
               value = selected,
               onValueChange = { _ -> onToggle() },
               role = Role.Checkbox
           )
           .padding(horizontal = 16.dp, vertical = 8.dp)
   ) {
       // ...
       Checkbox(
           checked = selected,
           onCheckedChange = null,
           modifier = Modifier.align(Alignment.CenterVertically)
       )
   }
}

@Composable
private fun TopicItem(itemTitle: String, selected: Boolean, onToggle: () -> Unit) {
   // ...
   Row(
       modifier = Modifier
           .toggleable(
               value = selected,
               onValueChange = { _ -> onToggle() },
               role = Role.Checkbox
           )
           .padding(horizontal = 16.dp, vertical = 8.dp)
   ) {
       // ...
       Checkbox(
           checked = selected,
           onCheckedChange = null,
           modifier = Modifier.align(Alignment.CenterVertically)
       )
   }
}

@Composable
private fun TopicItem(itemTitle: String, selected: Boolean, onToggle: () -> Unit) {
   // ...
   val stateNotSubscribed = stringResource(R.string.state_not_subscribed)
   val stateSubscribed = stringResource(R.string.state_subscribed)
   Row(
       modifier = Modifier
           .semantics {
               stateDescription = if (selected) {
                   stateSubscribed
               } else {
                   stateNotSubscribed
               }
           }
           .toggleable(
               value = selected,
               onValueChange = { _ -> onToggle() },
               role = Role.Checkbox
           )
           .padding(horizontal = 16.dp, vertical = 8.dp)
   ) {
       // ...
       Checkbox(
           checked = selected,
           onCheckedChange = null,
           modifier = Modifier.align(Alignment.CenterVertically)
       )
   }
}

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