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Linked Text

Author: Tad Fisher

Jetpack Compose Component that styles and handles clickable links which are part of the text that's passed to it. Here's how you use it

val text = buildAnnotatedString {
    withLink("https://www.google.com") {
        append("Google")
    }
}

LinkedText(
    text = text,
    onClick = { url -> onBrowseUrl(url) }
)

  
          import androidx.compose.animation.animateColorAsState
        
          import androidx.compose.foundation.gestures.detectTapGestures
        
          import androidx.compose.material.ContentAlpha
        
          import androidx.compose.material.LocalContentAlpha
        
          import androidx.compose.material.LocalContentColor
        
          import androidx.compose.material.LocalTextStyle
        
          import androidx.compose.material.MaterialTheme
        
          import androidx.compose.material.Text
        
          import androidx.compose.material.ripple.LocalRippleTheme
        
          import androidx.compose.runtime.Composable
        
          import androidx.compose.runtime.ExperimentalComposeApi
        
          import androidx.compose.runtime.Immutable
        
          import androidx.compose.runtime.State
        
          import androidx.compose.runtime.getValue
        
          import androidx.compose.runtime.mutableStateOf
        
          import androidx.compose.runtime.remember
        
          import androidx.compose.runtime.setValue
        
          import androidx.compose.ui.Modifier
        
          import androidx.compose.ui.graphics.Color
        
          import androidx.compose.ui.input.pointer.pointerInput
        
          import androidx.compose.ui.semantics.AccessibilityAction
        
          import androidx.compose.ui.semantics.SemanticsPropertyKey
        
          import androidx.compose.ui.semantics.SemanticsPropertyReceiver
        
          import androidx.compose.ui.semantics.semantics
        
          import androidx.compose.ui.text.AnnotatedString
        
          import androidx.compose.ui.text.ExperimentalTextApi
        
          import androidx.compose.ui.text.SpanStyle
        
          import androidx.compose.ui.text.TextLayoutResult
        
          import androidx.compose.ui.text.TextStyle
        
          import androidx.compose.ui.text.style.TextOverflow
        
          import androidx.compose.ui.text.withAnnotation
        
          private const val LinkTag = "Link"
        
          val ClickLink = SemanticsPropertyKey<AccessibilityAction<(index: Int) -> Boolean>>(
        
              name = "ClickLink",
        
              mergePolicy = { parentValue, childValue ->
        
                  AccessibilityAction(
        
                      parentValue?.label ?: childValue.label,
        
                      parentValue?.action ?: childValue.action
        
                  )
        
              }
        
          )
        
          fun SemanticsPropertyReceiver.onClickLink(
        
              label: String? = null,
        
              action: ((Int) -> Boolean)?
        
          ) {
        
              this[ClickLink] = AccessibilityAction(label, action)
        
          }
        
          @Composable
        
          fun LinkedText(
        
              text: AnnotatedString,
        
              modifier: Modifier = Modifier,
        
              enabled: Boolean = true,
        
              color: Color = LocalContentColor.current.copy(LocalContentAlpha.current),
        
              style: TextStyle = LocalTextStyle.current,
        
              softWrap: Boolean = true,
        
              overflow: TextOverflow = TextOverflow.Clip,
        
              maxLines: Int = Int.MAX_VALUE,
        
              onTextLayout: (TextLayoutResult) -> Unit = {},
        
              linkColors: LinkColors = LinkedTextDefaults.linkColors(),
        
              onClick: (String) -> Unit
        
          ) {
        
              var layoutResult: TextLayoutResult? by remember { mutableStateOf(null) }
        
              var pressedIndex: Int by remember { mutableStateOf(-1) }
        
              val annotations = text.getLinkAnnotations(0, text.length)
        
              val styledText = AnnotatedString.Builder(text).apply {
        
                  for ((i, ann) in annotations.withIndex()) {
        
                      val textColor = linkColors.textColor(enabled, i == pressedIndex).value
        
                      val backgroundColor = linkColors.backgroundColor(enabled, i == pressedIndex).value
        
                      addStyle(
        
                          SpanStyle(color = textColor, background = backgroundColor),
        
                          start = ann.start,
        
                          end = ann.end
        
                      )
        
                  }
        
              }.toAnnotatedString()
        
              val pressIndicator = Modifier.pointerInput(onClick) {
        
                  detectTapGestures(
        
                      onPress = { pos ->
        
                          layoutResult?.getOffsetForPosition(pos)?.let { offset ->
        
                              val index = annotations.indexOfFirst {
        
                                  it.start <= offset && it.end >= offset
        
                              }
        
                              pressedIndex = index
        
                              if (index >= 0) {
        
                                  tryAwaitRelease()
        
                                  pressedIndex = -1
        
                              }
        
                          }
        
                      },
        
                      onTap = { pos ->
        
                          layoutResult?.getOffsetForPosition(pos)?.let { offset ->
        
                              annotations.firstOrNull { it.start <= offset && it.end >= offset }
        
                                  ?.item
        
                                  ?.let { url -> onClick(url) }
        
                          }
        
                      }
        
                  )
        
              }
        
              val actionSemantics = Modifier.semantics {
        
                  onClickLink { index ->
        
                      annotations.getOrNull(index)?.let {
        
                          onClick(it.item)
        
                      }
        
                      true
        
                  }
        
              }
        
              Text(
        
                  text = styledText,
        
                  modifier = modifier
        
                      .then(pressIndicator)
        
                      .then(actionSemantics),
        
                  color = color,
        
                  style = style,
        
                  softWrap = softWrap,
        
                  overflow = overflow,
        
                  maxLines = maxLines,
        
                  onTextLayout = { result ->
        
                      layoutResult = result
        
                      onTextLayout(result)
        
                  }
        
              )
        
          }
        
          fun AnnotatedString.getLinkAnnotations(start: Int, end: Int): List<AnnotatedString.Range<String>> =
        
              getStringAnnotations(LinkTag, start, end)
        
          fun AnnotatedString.Builder.addLink(
        
              url: String,
        
              start: Int,
        
              end: Int
        
          ) = addStringAnnotation(LinkTag, url, start, end)
        
          @OptIn(ExperimentalComposeApi::class, ExperimentalTextApi::class)
        
          fun <R : Any> AnnotatedString.Builder.withLink(
        
              url: String,
        
              block: AnnotatedString.Builder.() -> R
        
          ): R = withAnnotation(LinkTag, url, block)
        
          object LinkedTextDefaults {
        
              @Composable
        
              fun linkColors(
        
                  textColor: Color = MaterialTheme.colors.primary,
        
                  disabledTextColor: Color = textColor.copy(ContentAlpha.disabled),
        
                  pressedTextColor: Color = textColor,
        
                  backgroundColor: Color = Color.Unspecified,
        
                  disabledBackgroundColor: Color = backgroundColor,
        
                  pressedBackgroundColor: Color = textColor.copy(
        
                      alpha = LocalRippleTheme.current.rippleAlpha().pressedAlpha
        
                  )
        
              ): LinkColors = DefaultLinkColors(
        
                  textColor = textColor,
        
                  disabledTextColor = disabledTextColor,
        
                  pressedTextColor = pressedTextColor,
        
                  backgroundColor = backgroundColor,
        
                  disabledBackgroundColor = disabledBackgroundColor,
        
                  pressedBackgroundColor = pressedBackgroundColor
        
              )
        
          }
        
          interface LinkColors {
        
              @Composable
        
              fun textColor(enabled: Boolean, isPressed: Boolean): State<Color>
        
              @Composable
        
              fun backgroundColor(enabled: Boolean, isPressed: Boolean): State<Color>
        
          }
        
          @Immutable
        
          private data class DefaultLinkColors(
        
              private val textColor: Color,
        
              private val disabledTextColor: Color,
        
              private val pressedTextColor: Color,
        
              private val backgroundColor: Color,
        
              private val disabledBackgroundColor: Color,
        
              private val pressedBackgroundColor: Color
        
          ) : LinkColors {
        
              @Composable
        
              override fun textColor(enabled: Boolean, isPressed: Boolean): State<Color> =
        
                  animateColorAsState(
        
                      when {
        
                          !enabled -> disabledTextColor
        
                          isPressed -> pressedTextColor
        
                          else -> textColor
        
                      }
        
                  )
        
              @Composable
        
              override fun backgroundColor(enabled: Boolean, isPressed: Boolean): State<Color> =
        
                  animateColorAsState(
        
                      when {
        
                          !enabled -> disabledBackgroundColor
        
                          isPressed -> pressedBackgroundColor
        
                          else -> backgroundColor
        
                      }
        
                  )
        
          }

view raw LinkedText.kt hosted with ❤ by GitHub

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Compose Code Snippets

	import androidx.compose.animation.animateColorAsState
	import androidx.compose.foundation.gestures.detectTapGestures
	import androidx.compose.material.ContentAlpha
	import androidx.compose.material.LocalContentAlpha
	import androidx.compose.material.LocalContentColor
	import androidx.compose.material.LocalTextStyle
	import androidx.compose.material.MaterialTheme
	import androidx.compose.material.Text
	import androidx.compose.material.ripple.LocalRippleTheme
	import androidx.compose.runtime.Composable
	import androidx.compose.runtime.ExperimentalComposeApi
	import androidx.compose.runtime.Immutable
	import androidx.compose.runtime.State
	import androidx.compose.runtime.getValue
	import androidx.compose.runtime.mutableStateOf
	import androidx.compose.runtime.remember
	import androidx.compose.runtime.setValue
	import androidx.compose.ui.Modifier
	import androidx.compose.ui.graphics.Color
	import androidx.compose.ui.input.pointer.pointerInput
	import androidx.compose.ui.semantics.AccessibilityAction
	import androidx.compose.ui.semantics.SemanticsPropertyKey
	import androidx.compose.ui.semantics.SemanticsPropertyReceiver
	import androidx.compose.ui.semantics.semantics
	import androidx.compose.ui.text.AnnotatedString
	import androidx.compose.ui.text.ExperimentalTextApi
	import androidx.compose.ui.text.SpanStyle
	import androidx.compose.ui.text.TextLayoutResult
	import androidx.compose.ui.text.TextStyle
	import androidx.compose.ui.text.style.TextOverflow
	import androidx.compose.ui.text.withAnnotation

	private const val LinkTag = "Link"

	val ClickLink = SemanticsPropertyKey<AccessibilityAction<(index: Int) -> Boolean>>(
	name = "ClickLink",
	mergePolicy = { parentValue, childValue ->
	AccessibilityAction(
	parentValue?.label ?: childValue.label,
	parentValue?.action ?: childValue.action
	)
	}
	)

	fun SemanticsPropertyReceiver.onClickLink(
	label: String? = null,
	action: ((Int) -> Boolean)?
	) {
	this[ClickLink] = AccessibilityAction(label, action)
	}

	@Composable
	fun LinkedText(
	text: AnnotatedString,
	modifier: Modifier = Modifier,
	enabled: Boolean = true,
	color: Color = LocalContentColor.current.copy(LocalContentAlpha.current),
	style: TextStyle = LocalTextStyle.current,
	softWrap: Boolean = true,
	overflow: TextOverflow = TextOverflow.Clip,
	maxLines: Int = Int.MAX_VALUE,
	onTextLayout: (TextLayoutResult) -> Unit = {},
	linkColors: LinkColors = LinkedTextDefaults.linkColors(),
	onClick: (String) -> Unit
	) {
	var layoutResult: TextLayoutResult? by remember { mutableStateOf(null) }

	var pressedIndex: Int by remember { mutableStateOf(-1) }

	val annotations = text.getLinkAnnotations(0, text.length)

	val styledText = AnnotatedString.Builder(text).apply {
	for ((i, ann) in annotations.withIndex()) {
	val textColor = linkColors.textColor(enabled, i == pressedIndex).value
	val backgroundColor = linkColors.backgroundColor(enabled, i == pressedIndex).value
	addStyle(
	SpanStyle(color = textColor, background = backgroundColor),
	start = ann.start,
	end = ann.end
	)
	}
	}.toAnnotatedString()

	val pressIndicator = Modifier.pointerInput(onClick) {
	detectTapGestures(
	onPress = { pos ->
	layoutResult?.getOffsetForPosition(pos)?.let { offset ->
	val index = annotations.indexOfFirst {
	it.start <= offset && it.end >= offset
	}
	pressedIndex = index
	if (index >= 0) {
	tryAwaitRelease()
	pressedIndex = -1
	}
	}
	},
	onTap = { pos ->
	layoutResult?.getOffsetForPosition(pos)?.let { offset ->
	annotations.firstOrNull { it.start <= offset && it.end >= offset }
	?.item
	?.let { url -> onClick(url) }
	}
	}
	)
	}

	val actionSemantics = Modifier.semantics {
	onClickLink { index ->
	annotations.getOrNull(index)?.let {
	onClick(it.item)
	}
	true
	}
	}

	Text(
	text = styledText,
	modifier = modifier
	.then(pressIndicator)
	.then(actionSemantics),
	color = color,
	style = style,
	softWrap = softWrap,
	overflow = overflow,
	maxLines = maxLines,
	onTextLayout = { result ->
	layoutResult = result
	onTextLayout(result)
	}
	)
	}

	fun AnnotatedString.getLinkAnnotations(start: Int, end: Int): List<AnnotatedString.Range<String>> =
	getStringAnnotations(LinkTag, start, end)

	fun AnnotatedString.Builder.addLink(
	url: String,
	start: Int,
	end: Int
	) = addStringAnnotation(LinkTag, url, start, end)

	@OptIn(ExperimentalComposeApi::class, ExperimentalTextApi::class)
	fun <R : Any> AnnotatedString.Builder.withLink(
	url: String,
	block: AnnotatedString.Builder.() -> R
	): R = withAnnotation(LinkTag, url, block)

	object LinkedTextDefaults {
	@Composable
	fun linkColors(
	textColor: Color = MaterialTheme.colors.primary,
	disabledTextColor: Color = textColor.copy(ContentAlpha.disabled),
	pressedTextColor: Color = textColor,
	backgroundColor: Color = Color.Unspecified,
	disabledBackgroundColor: Color = backgroundColor,
	pressedBackgroundColor: Color = textColor.copy(
	alpha = LocalRippleTheme.current.rippleAlpha().pressedAlpha
	)
	): LinkColors = DefaultLinkColors(
	textColor = textColor,
	disabledTextColor = disabledTextColor,
	pressedTextColor = pressedTextColor,
	backgroundColor = backgroundColor,
	disabledBackgroundColor = disabledBackgroundColor,
	pressedBackgroundColor = pressedBackgroundColor
	)
	}

	interface LinkColors {
	@Composable
	fun textColor(enabled: Boolean, isPressed: Boolean): State<Color>

	@Composable
	fun backgroundColor(enabled: Boolean, isPressed: Boolean): State<Color>
	}

	@Immutable
	private data class DefaultLinkColors(
	private val textColor: Color,
	private val disabledTextColor: Color,
	private val pressedTextColor: Color,
	private val backgroundColor: Color,
	private val disabledBackgroundColor: Color,
	private val pressedBackgroundColor: Color
	) : LinkColors {

	@Composable
	override fun textColor(enabled: Boolean, isPressed: Boolean): State<Color> =
	animateColorAsState(
	when {
	!enabled -> disabledTextColor
	isPressed -> pressedTextColor
	else -> textColor
	}
	)

	@Composable
	override fun backgroundColor(enabled: Boolean, isPressed: Boolean): State<Color> =
	animateColorAsState(
	when {
	!enabled -> disabledBackgroundColor
	isPressed -> pressedBackgroundColor
	else -> backgroundColor
	}
	)
	}