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Can get current styling from RichTextString.Builder #45

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Can get current styling from RichTextString.Builder #45

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4d75ccd
Can get active string styling from RichTextString.Builder
bjdodson-openai Sep 10, 2025
4708794
Efficient tracking
bjdodson-openai Sep 10, 2025
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46 changes: 43 additions & 3 deletions richtext-ui/src/commonMain/kotlin/com/halilibo/richtext/ui/string/RichTextString.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -361,6 +361,9 @@ public class RichTextString internal constructor(
public class Builder(capacity: Int = 16) {
private val builder = AnnotatedString.Builder(capacity)
private val formatObjects = mutableMapOf<String, Any>()
// Tracks formats pushed via pushFormat along with the underlying builder index,
// so we can compute the current SpanStyle without materializing an AnnotatedString.
private val activeFormatStack = mutableListOf<Pair<Int, Format>>()

public fun addFormat(
format: Format,
Expand All @@ -373,12 +376,27 @@ public class RichTextString internal constructor(

public fun pushFormat(format: Format): Int {
val tag = format.registerTag(formatObjects)
return builder.pushStringAnnotation(FormatAnnotationScope, tag)
val idx = builder.pushStringAnnotation(FormatAnnotationScope, tag)
activeFormatStack.add(idx to format)
return idx
}

public fun pop(): Unit = builder.pop()
public fun pop(): Unit {
builder.pop()
if (activeFormatStack.isNotEmpty()) activeFormatStack.removeAt(activeFormatStack.lastIndex)
}

public fun pop(index: Int): Unit {
builder.pop(index)

public fun pop(index: Int): Unit = builder.pop(index)
if (activeFormatStack.isNotEmpty()) {
var i = activeFormatStack.lastIndex
while (i >= 0 && activeFormatStack[i].first >= index) {
activeFormatStack.removeAt(i)
i--
}
}
}

public fun append(text: String): Unit = builder.append(text)

Expand Down Expand Up @@ -407,6 +425,28 @@ public class RichTextString internal constructor(
builder.toAnnotatedString(),
formatObjects.toMap()
)

/**
* Returns the [SpanStyle] that would currently apply to newly appended text, based on
* the formats that are pushed (but not yet popped) on this builder.
*
* Only formats added via [pushFormat] are considered; any direct operations performed
* via [withAnnotatedString] or [addFormat] are not reflected in the result by design.
*/
public fun getCurrentSpanStyle(
style: RichTextStringStyle,
contentColor: Color
): SpanStyle {
val resolvedStyle = style.resolveDefaults()
var current = SpanStyle()
// Only consider formats that are currently pushed (and not yet popped).
// Ignore formats added via addFormat, by design.
for ((_, format) in activeFormatStack) {
val annotation = format.getAnnotation(resolvedStyle, contentColor)
if (annotation is SpanStyle) current = current.merge(annotation)
}
return current
}
}
}

Expand Down