Import source from https://github.com/2dxgujun/Kpan

dependencies_groups.gradle

@@ -240,7 +240,6 @@ ext.groups = [
                 ],
                 group: [
                         'me.dm7.barcodescanner',
-                        'me.gujun.android',
                 ]
         ]
 ]

library/external/jsonviewer/build.gradle

@@ -58,9 +58,7 @@ dependencies {
 
     implementation libs.airbnb.mavericks
     // Span utils
-    implementation('me.gujun.android:span:1.7') {
+    implementation project(":library:external:span")
-        exclude group: 'com.android.support', module: 'support-annotations'
-    }
 
     implementation libs.jetbrains.coroutinesCore
     implementation libs.jetbrains.coroutinesAndroid

library/external/span/build.gradle

@@ -0,0 +1,20 @@
+apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
+
+android {
+    namespace "me.gujun.android.span"
+    compileSdk versions.compileSdk
+
+    defaultConfig {
+        minSdk versions.minSdk
+        targetSdk versions.targetSdk
+    }
+
+    sourceSets {
+        main.java.srcDirs += 'src/main/kotlin'
+    }
+}
+
+dependencies {
+    implementation 'com.android.support:support-annotations:28.0.0'
+}

library/external/span/src/main/kotlin/me/gujun/android/span/span.kt

@@ -0,0 +1,316 @@
+package me.gujun.android.span
+
+import android.graphics.Typeface
+import android.graphics.drawable.Drawable
+import android.text.Layout
+import android.text.Spannable
+import android.text.SpannableStringBuilder
+import android.text.TextUtils
+import android.text.style.AbsoluteSizeSpan
+import android.text.style.AlignmentSpan
+import android.text.style.BackgroundColorSpan
+import android.text.style.ForegroundColorSpan
+import android.text.style.ImageSpan
+import android.text.style.QuoteSpan
+import android.text.style.StyleSpan
+import android.text.style.SubscriptSpan
+import android.text.style.SuperscriptSpan
+import android.text.style.TypefaceSpan
+import android.text.style.URLSpan
+import android.view.View
+import androidx.annotation.ColorInt
+import androidx.annotation.Dimension
+import me.gujun.android.span.style.CustomTypefaceSpan
+import me.gujun.android.span.style.LineSpacingSpan
+import me.gujun.android.span.style.SimpleClickableSpan
+import me.gujun.android.span.style.TextDecorationLineSpan
+import me.gujun.android.span.style.VerticalPaddingSpan
+
+class Span(val parent: Span? = null) : SpannableStringBuilder() {
+
+  companion object {
+    val EMPTY_STYLE = Span()
+
+    var globalStyle: Span = EMPTY_STYLE
+  }
+
+  var text: CharSequence = ""
+
+  @ColorInt var textColor: Int? = parent?.textColor
+
+  @ColorInt var backgroundColor: Int? = parent?.backgroundColor
+
+  @Dimension(unit = Dimension.PX) var textSize: Int? = parent?.textSize
+
+  var fontFamily: String? = parent?.fontFamily
+
+  var typeface: Typeface? = parent?.typeface
+
+  var textStyle: String? = parent?.textStyle
+
+  var alignment: String? = parent?.alignment
+
+  var textDecorationLine: String? = parent?.textDecorationLine
+
+  @Dimension(unit = Dimension.PX) var lineSpacing: Int? = null
+
+  @Dimension(unit = Dimension.PX) var paddingTop: Int? = null
+
+  @Dimension(unit = Dimension.PX) var paddingBottom: Int? = null
+
+  @Dimension(unit = Dimension.PX) var verticalPadding: Int? = null
+
+  var onClick: (() -> Unit)? = null
+
+  var spans: ArrayList<Any> = ArrayList()
+
+  var style: Span = EMPTY_STYLE
+
+  private fun buildCharacterStyle(builder: ArrayList<Any>) {
+    if (textColor != null) {
+      builder.add(ForegroundColorSpan(textColor!!))
+    }
+
+    if (backgroundColor != null) {
+      builder.add(BackgroundColorSpan(backgroundColor!!))
+    }
+
+    if (textSize != null) {
+      builder.add(AbsoluteSizeSpan(textSize!!))
+    }
+
+    if (!TextUtils.isEmpty(fontFamily)) {
+      builder.add(TypefaceSpan(fontFamily))
+    }
+
+    if (typeface != null) {
+      builder.add(CustomTypefaceSpan(typeface!!))
+    }
+
+    if (!TextUtils.isEmpty(textStyle)) {
+      builder.add(StyleSpan(when (textStyle) {
+        "normal" -> Typeface.NORMAL
+        "bold" -> Typeface.BOLD
+        "italic" -> Typeface.ITALIC
+        "bold_italic" -> Typeface.BOLD_ITALIC
+        else -> throw RuntimeException("Unknown text style")
+      }))
+    }
+
+    if (!TextUtils.isEmpty(textDecorationLine)) {
+      builder.add(TextDecorationLineSpan(textDecorationLine!!))
+    }
+
+    if (onClick != null) {
+      builder.add(object : SimpleClickableSpan() {
+        override fun onClick(widget: View) {
+          onClick?.invoke()
+        }
+      })
+    }
+  }
+
+  private fun buildParagraphStyle(builder: ArrayList<Any>) {
+    if (!TextUtils.isEmpty(alignment)) {
+      builder.add(AlignmentSpan.Standard(when (alignment) {
+        "normal" -> Layout.Alignment.ALIGN_NORMAL
+        "opposite" -> Layout.Alignment.ALIGN_OPPOSITE
+        "center" -> Layout.Alignment.ALIGN_CENTER
+        else -> throw RuntimeException("Unknown text alignment")
+      }))
+    }
+
+    if (lineSpacing != null) {
+      builder.add(LineSpacingSpan(lineSpacing!!))
+    }
+
+    paddingTop = when {
+      paddingTop != null -> paddingTop
+      verticalPadding != null -> verticalPadding
+      else -> 0
+    }
+    paddingBottom = when {
+      paddingBottom != null -> paddingBottom
+      verticalPadding != null -> verticalPadding
+      else -> 0
+    }
+    if (paddingTop != 0 || paddingBottom != 0) {
+      builder.add(VerticalPaddingSpan(paddingTop!!, paddingBottom!!))
+    }
+  }
+
+  private fun prebuild() {
+    override(style)
+  }
+
+  fun build(): Span {
+    prebuild()
+    val builder = ArrayList<Any>()
+    if (!TextUtils.isEmpty(text)) {
+      var p = this.parent
+      while (p != null) {
+        if (!TextUtils.isEmpty(p.text)) {
+          throw RuntimeException("Can't nest \"$text\" in spans")
+        }
+        p = p.parent
+      }
+      append(text)
+      buildCharacterStyle(builder)
+      buildParagraphStyle(builder)
+    } else {
+      buildParagraphStyle(builder)
+    }
+
+    builder.addAll(spans)
+    builder.forEach {
+      setSpan(it, 0, length, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
+    }
+    return this
+  }
+
+  fun override(style: Span) {
+    if (textColor == null) {
+      textColor = style.textColor
+    }
+    if (backgroundColor == null) {
+      backgroundColor = style.backgroundColor
+    }
+    if (textSize == null) {
+      textSize = style.textSize
+    }
+    if (fontFamily == null) {
+      fontFamily = style.fontFamily
+    }
+    if (typeface == null) {
+      typeface = style.typeface
+    }
+    if (textStyle == null) {
+      textStyle = style.textStyle
+    }
+    if (alignment == null) {
+      alignment = style.alignment
+    }
+    if (textDecorationLine == null) {
+      textDecorationLine = style.textDecorationLine
+    }
+    if (lineSpacing == null) {
+      lineSpacing = style.lineSpacing
+    }
+    if (paddingTop == null) {
+      paddingTop = style.paddingTop
+    }
+    if (paddingBottom == null) {
+      paddingBottom = style.paddingBottom
+    }
+    if (verticalPadding == null) {
+      verticalPadding = style.verticalPadding
+    }
+    if (onClick == null) {
+      onClick = style.onClick
+    }
+    spans.addAll(style.spans)
+  }
+
+  operator fun CharSequence.unaryPlus(): CharSequence {
+    return append(Span(parent = this@Span).apply {
+      text = this@unaryPlus
+      build()
+    })
+  }
+
+  operator fun Span.plus(other: CharSequence): CharSequence {
+    return append(Span(parent = this).apply {
+      text = other
+      build()
+    })
+  }
+}
+
+fun span(init: Span.() -> Unit): Span = Span().apply {
+  override(Span.globalStyle)
+  init()
+  build()
+}
+
+fun span(text: CharSequence, init: Span.() -> Unit): Span = Span().apply {
+  override(Span.globalStyle)
+  this.text = text
+  init()
+  build()
+}
+
+fun style(init: Span.() -> Unit): Span = Span().apply {
+  init()
+}
+
+fun Span.span(init: Span.() -> Unit = {}): Span = apply {
+  append(Span(parent = this).apply {
+    init()
+    build()
+  })
+}
+
+fun Span.span(text: CharSequence, init: Span.() -> Unit = {}): Span = apply {
+  append(Span(parent = this).apply {
+    this.text = text
+    init()
+    build()
+  })
+}
+
+fun Span.link(url: String, text: CharSequence = "",
+    init: Span.() -> Unit = {}): Span = apply {
+  append(Span(parent = this).apply {
+    this.text = text
+    this.spans.add(URLSpan(url))
+    init()
+    build()
+  })
+}
+
+fun Span.quote(@ColorInt color: Int, text: CharSequence = "",
+    init: Span.() -> Unit = {}): Span = apply {
+  append(Span(parent = this).apply {
+    this.text = text
+    this.spans.add(QuoteSpan(color))
+    init()
+    build()
+  })
+}
+
+fun Span.superscript(text: CharSequence = "", init: Span.() -> Unit = {}): Span = apply {
+  append(Span(parent = this).apply {
+    this.text = text
+    this.spans.add(SuperscriptSpan())
+    init()
+    build()
+  })
+}
+
+fun Span.subscript(text: CharSequence = "", init: Span.() -> Unit = {}): Span = apply {
+  append(Span(parent = this).apply {
+    this.text = text
+    this.spans.add(SubscriptSpan())
+    init()
+    build()
+  })
+}
+
+fun Span.image(drawable: Drawable, alignment: String = "bottom",
+    init: Span.() -> Unit = {}): Span = apply {
+  drawable.setBounds(0, 0, drawable.intrinsicWidth, drawable.intrinsicHeight)
+  append(Span(parent = this).apply {
+    this.text = " "
+    this.spans.add(ImageSpan(drawable, when (alignment) {
+      "bottom" -> ImageSpan.ALIGN_BOTTOM
+      "baseline" -> ImageSpan.ALIGN_BASELINE
+      else -> throw RuntimeException("Unknown image alignment")
+    }))
+    init()
+    build()
+  })
+}
+
+fun Span.addSpan(what: Any) = apply {
+  this.spans.add(what)
+}

library/external/span/src/main/kotlin/me/gujun/android/span/style/CustomTypefaceSpan.kt

@@ -0,0 +1,36 @@
+package me.gujun.android.span.style
+
+import android.graphics.Paint
+import android.graphics.Typeface
+import android.text.TextPaint
+import android.text.style.MetricAffectingSpan
+
+class CustomTypefaceSpan(private val tf: Typeface) : MetricAffectingSpan() {
+
+  override fun updateMeasureState(paint: TextPaint) {
+    apply(paint, tf)
+  }
+
+  override fun updateDrawState(ds: TextPaint) {
+    apply(ds, tf)
+  }
+
+  private fun apply(paint: Paint, tf: Typeface) {
+    val oldStyle: Int
+
+    val old = paint.typeface
+    oldStyle = old?.style ?: 0
+
+    val fake = oldStyle and tf.style.inv()
+
+    if (fake and Typeface.BOLD != 0) {
+      paint.isFakeBoldText = true
+    }
+
+    if (fake and Typeface.ITALIC != 0) {
+      paint.textSkewX = -0.25f
+    }
+
+    paint.typeface = tf
+  }
+}

library/external/span/src/main/kotlin/me/gujun/android/span/style/LineSpacingSpan.kt

@@ -0,0 +1,31 @@
+package me.gujun.android.span.style
+
+import android.graphics.Paint.FontMetricsInt
+import android.text.Spanned
+import android.text.style.LineHeightSpan
+
+class LineSpacingSpan(private val add: Int) : LineHeightSpan {
+
+  override fun chooseHeight(text: CharSequence, start: Int, end: Int, spanstartv: Int, v: Int,
+      fm: FontMetricsInt) {
+    text as Spanned
+    /*val spanStart =*/ text.getSpanStart(this)
+    val spanEnd = text.getSpanEnd(this)
+
+//    Log.d("DEBUG", "Text: start=$start end=$end v=$v") // end may include the \n character
+//    Log.d("DEBUG", "${text.slice(start until end)}".replace("\n", "#"))
+//    Log.d("DEBUG", "LineSpacingSpan: spanStart=$spanStart spanEnd=$spanEnd spanstartv=$spanstartv")
+//    Log.d("DEBUG", "$fm")
+//    Log.d("DEBUG", "-----------------------")
+
+    if (spanstartv == v) {
+      fm.descent += add
+    } else if (text[start - 1] == '\n') {
+      fm.descent += add
+    }
+
+    if (end == spanEnd || end - 1 == spanEnd) {
+      fm.descent -= add
+    }
+  }
+}

library/external/span/src/main/kotlin/me/gujun/android/span/style/SimpleClickableSpan.kt

@@ -0,0 +1,10 @@
+package me.gujun.android.span.style
+
+import android.text.TextPaint
+import android.text.style.ClickableSpan
+
+abstract class SimpleClickableSpan : ClickableSpan() {
+  override fun updateDrawState(ds: TextPaint) {
+    // no-op
+  }
+}

library/external/span/src/main/kotlin/me/gujun/android/span/style/TextDecorationLineSpan.kt

@@ -0,0 +1,29 @@
+package me.gujun.android.span.style
+
+import android.text.TextPaint
+import android.text.style.CharacterStyle
+
+class TextDecorationLineSpan(private val textDecorationLine: String) : CharacterStyle() {
+
+  override fun updateDrawState(tp: TextPaint) {
+    when (textDecorationLine) {
+      "none" -> {
+        tp.isUnderlineText = false
+        tp.isStrikeThruText = false
+      }
+      "underline" -> {
+        tp.isUnderlineText = true
+        tp.isStrikeThruText = false
+      }
+      "line-through" -> {
+        tp.isUnderlineText = false
+        tp.isStrikeThruText = true
+      }
+      "underline line-through" -> {
+        tp.isUnderlineText = true
+        tp.isStrikeThruText = true
+      }
+      else -> throw RuntimeException("Unknown text decoration line")
+    }
+  }
+}

library/external/span/src/main/kotlin/me/gujun/android/span/style/VerticalPaddingSpan.kt

@@ -0,0 +1,41 @@
+package me.gujun.android.span.style
+
+import android.graphics.Paint.FontMetricsInt
+import android.text.Spanned
+import android.text.style.LineHeightSpan
+
+class VerticalPaddingSpan(private val paddingTop: Int,
+    private val paddingBottom: Int) : LineHeightSpan {
+
+  private var flag: Boolean = true
+
+  override fun chooseHeight(text: CharSequence, start: Int, end: Int, spanstartv: Int, v: Int,
+      fm: FontMetricsInt) {
+    text as Spanned
+    /*val spanStart =*/ text.getSpanStart(this)
+    val spanEnd = text.getSpanEnd(this)
+
+//    Log.d("DEBUG", "Text: start=$start end=$end v=$v") // end may include the \n character
+//    Log.d("DEBUG", "${text.slice(start until end)}".replace("\n", "#"))
+//    Log.d("DEBUG", "VerticalPadding: spanStart=$spanStart spanEnd=$spanEnd spanstartv=$spanstartv")
+//    Log.d("DEBUG", "$fm")
+//    Log.d("DEBUG", "-----------------------")
+
+    if (spanstartv == v) {
+      fm.top -= paddingTop
+      fm.ascent -= paddingTop
+      flag = true
+    } else if (flag && text[start - 1] != '\n') {
+      fm.top += paddingTop
+      fm.ascent += paddingTop
+      flag = false
+    } else {
+      flag = false
+    }
+
+    if (end == spanEnd || end - 1 == spanEnd) {
+      fm.descent += paddingBottom
+      fm.bottom += paddingBottom
+    }
+  }
+}

settings.gradle

@@ -14,6 +14,7 @@ include ':library:external:dialpad'
 include ':library:external:textdrawable'
 include ':library:external:autocomplete'
 include ':library:external:realmfieldnameshelper'
+include ':library:external:span'
 
 include ':library:rustCrypto'
 include ':matrix-sdk-android'

vector-app/build.gradle

@@ -396,6 +396,7 @@ dependencies {
     implementation project(':vector')
     implementation project(':vector-config')
     implementation project(':library:core-utils')
+    debugImplementation project(':library:external:span')
     debugImplementation project(':library:ui-styles')
     implementation libs.dagger.hilt
     implementation 'androidx.multidex:multidex:2.0.1'

vector/build.gradle

@@ -187,9 +187,7 @@ dependencies {
 
     // UI
     implementation libs.google.material
-    api('me.gujun.android:span:1.7') {
+    implementation project(":library:external:span")
-        exclude group: 'com.android.support', module: 'support-annotations'
-    }
     implementation libs.markwon.core
     implementation libs.markwon.extLatex
     implementation libs.markwon.imageGlide