v1.0.4 as published

composeApp/src/commonMain/kotlin/net/sergeych/toread/ReaderContent.kt

@@ -46,6 +46,7 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.draw.drawWithContent
 import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.geometry.Rect
 import androidx.compose.ui.geometry.Size
 import androidx.compose.ui.graphics.BlendMode
 import androidx.compose.ui.graphics.Brush
@@ -1097,7 +1098,14 @@ private fun Modifier.readerLinkTapHandler(
 ): Modifier = pointerInput(annotatedText, textLayout, onLinkOpen) {
     awaitEachGesture {
         val down = awaitFirstDown(requireUnconsumed = false, pass = PointerEventPass.Main)
-        val link = textLayout?.readerLinkAt(annotatedText, down.position)
+        val link = textLayout?.readerLinkAt(
+            text = annotatedText,
+            position = down.position,
+            minimumTouchWidthPx = ReaderLinkMinimumTouchWidth.toPx(),
+            minimumTouchHeightPx = ReaderLinkMinimumTouchHeight.toPx(),
+            horizontalPaddingPx = ReaderLinkHorizontalTouchPadding.toPx(),
+            verticalPaddingPx = ReaderLinkVerticalTouchPadding.toPx(),
+        )
         if (link == null) {
             waitForUpOrCancellation(pass = PointerEventPass.Main)
             return@awaitEachGesture
@@ -1112,11 +1120,78 @@ private fun Modifier.readerLinkTapHandler(
     }
 }
 
-private fun TextLayoutResult.readerLinkAt(text: AnnotatedString, position: Offset): String? {
-    val offset = getOffsetForPosition(position)
-    return text.getStringAnnotations(ReaderLinkAnnotationTag, offset, offset)
-        .firstOrNull()
+private fun TextLayoutResult.readerLinkAt(
+    text: AnnotatedString,
+    position: Offset,
+    minimumTouchWidthPx: Float,
+    minimumTouchHeightPx: Float,
+    horizontalPaddingPx: Float,
+    verticalPaddingPx: Float,
+): String? =
+    text.getStringAnnotations(ReaderLinkAnnotationTag, 0, text.length)
+        .firstOrNull { annotation ->
+            readerLinkTouchBounds(
+                start = annotation.start,
+                end = annotation.end,
+                minimumTouchWidthPx = minimumTouchWidthPx,
+                minimumTouchHeightPx = minimumTouchHeightPx,
+                horizontalPaddingPx = horizontalPaddingPx,
+                verticalPaddingPx = verticalPaddingPx,
+            ).any { it.contains(position) }
+        }
         ?.item
+
+private fun TextLayoutResult.readerLinkTouchBounds(
+    start: Int,
+    end: Int,
+    minimumTouchWidthPx: Float,
+    minimumTouchHeightPx: Float,
+    horizontalPaddingPx: Float,
+    verticalPaddingPx: Float,
+): List<Rect> {
+    if (start >= end) return emptyList()
+
+    val boundsByLine = linkedMapOf<Int, Rect>()
+    val safeEnd = min(end, layoutInput.text.length)
+    for (offset in start until safeEnd) {
+        val line = getLineForOffset(offset)
+        val bounds = getBoundingBox(offset)
+        boundsByLine[line] = boundsByLine[line]?.union(bounds) ?: bounds
+    }
+
+    return boundsByLine.values.map { bounds ->
+        bounds.withCenteredTouchPadding(
+            minimumWidth = minimumTouchWidthPx,
+            minimumHeight = minimumTouchHeightPx,
+            horizontalPadding = horizontalPaddingPx,
+            verticalPadding = verticalPaddingPx,
+        )
+    }
+}
+
+private fun Rect.union(other: Rect): Rect =
+    Rect(
+        left = min(left, other.left),
+        top = min(top, other.top),
+        right = max(right, other.right),
+        bottom = max(bottom, other.bottom),
+    )
+
+private fun Rect.withCenteredTouchPadding(
+    minimumWidth: Float,
+    minimumHeight: Float,
+    horizontalPadding: Float,
+    verticalPadding: Float,
+): Rect {
+    val touchWidth = max(width + horizontalPadding * 2f, minimumWidth)
+    val touchHeight = max(height + verticalPadding * 2f, minimumHeight)
+    val center = center
+    return Rect(
+        left = center.x - touchWidth / 2f,
+        top = center.y - touchHeight / 2f,
+        right = center.x + touchWidth / 2f,
+        bottom = center.y + touchHeight / 2f,
+    )
 }
 
 private fun AnnotatedString.hasReaderLinks(): Boolean =
@@ -1537,6 +1612,10 @@ private const val CombiningAcuteAccent = '\u0301'
 private const val ReadAloudStressableLetters = "аеёиоуыэюяАЕЁИОУЫЭЮЯaeiouyAEIOUY"
 private const val ReaderLinkAnnotationTag = "fb2-link"
 private val LinkTextColor = Color(0xFF0B57D0)
+private val ReaderLinkMinimumTouchWidth = 44.dp
+private val ReaderLinkMinimumTouchHeight = 40.dp
+private val ReaderLinkHorizontalTouchPadding = 10.dp
+private val ReaderLinkVerticalTouchPadding = 6.dp
 
 private val ReadAloudHardcodedTextReplacements = listOf(
     ReadAloudTextReplacement(from = "Господа,", to = "Господ/а,", caseSensitive = true),