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@alorma
Created September 19, 2018 14:23
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import android.graphics.Typeface.BOLD
import android.graphics.Typeface.ITALIC
import android.support.annotation.ColorInt
import android.text.Spannable.SPAN_INCLUSIVE_EXCLUSIVE
import android.text.SpannableStringBuilder
import android.text.SpannedString
import android.text.style.*
fun spannable(block: SpannableStringBuilder.() -> Unit): SpannableStringBuilder = SpannableStringBuilder().apply(block)
fun SpannableStringBuilder.appendSpace(): SpannableStringBuilder = append(" ")
fun SpannableStringBuilder.appendWithSpace(charSequence: CharSequence): SpannableStringBuilder {
append(charSequence)
appendSpace()
return this
}
/**
* Builds new string by populating a newly created [SpannableStringBuilder] using the provided
* [builderAction] and then converting it to [SpannedString].
*/
inline fun buildSpannedString(builderAction: SpannableStringBuilder.() -> Unit): SpannedString {
val builder = SpannableStringBuilder()
builder.builderAction()
return SpannedString(builder)
}
/**
* Wrap appended text in [builderAction] in [spans].
*
* Note: the spans will only have the correct position if the [builderAction] only appends or
* replaces text. Inserting, deleting, or clearing the text will cause the span to be placed at
* an incorrect position.
*/
inline fun SpannableStringBuilder.inSpans(
vararg spans: Any,
builderAction: SpannableStringBuilder.() -> Unit
): SpannableStringBuilder {
val start = length
builderAction()
for (span in spans) setSpan(span, start, length, SPAN_INCLUSIVE_EXCLUSIVE)
return this
}
/**
* Wrap appended text in [builderAction] in [span].
*
* Note: the span will only have the correct position if the `builderAction` only appends or
* replaces text. Inserting, deleting, or clearing the text will cause the span to be placed at
* an incorrect position.
*/
inline fun SpannableStringBuilder.inSpans(
span: Any,
builderAction: SpannableStringBuilder.() -> Unit
): SpannableStringBuilder {
val start = length
builderAction()
setSpan(span, start, length, SPAN_INCLUSIVE_EXCLUSIVE)
return this
}
/**
* Wrap appended text in [builderAction] in a @Style [TextAppearanceSpan].
*
* @see SpannableStringBuilder.inSpans
*/
inline fun SpannableStringBuilder.style(
styleSpan: Any,
builderAction: SpannableStringBuilder.() -> Unit) =
inSpans(styleSpan, builderAction = builderAction)
/**
* Wrap appended text in [builderAction] in a bold [StyleSpan].
*
* @see SpannableStringBuilder.inSpans
*/
inline fun SpannableStringBuilder.bold(builderAction: SpannableStringBuilder.() -> Unit) =
inSpans(StyleSpan(BOLD), builderAction = builderAction)
/**
* Wrap appended text in [builderAction] in an italic [StyleSpan].
*
* @see SpannableStringBuilder.inSpans
*/
inline fun SpannableStringBuilder.italic(builderAction: SpannableStringBuilder.() -> Unit) =
inSpans(StyleSpan(ITALIC), builderAction = builderAction)
/**
* Wrap appended text in [builderAction] in an [UnderlineSpan].
*
* @see SpannableStringBuilder.inSpans
*/
inline fun SpannableStringBuilder.underline(builderAction: SpannableStringBuilder.() -> Unit) =
inSpans(UnderlineSpan(), builderAction = builderAction)
/**
* Wrap appended text in [builderAction] in a [ForegroundColorSpan].
*
* @see SpannableStringBuilder.inSpans
*/
inline fun SpannableStringBuilder.color(
@ColorInt color: Int,
builderAction: SpannableStringBuilder.() -> Unit
) = inSpans(ForegroundColorSpan(color), builderAction = builderAction)
/**
* Wrap appended text in [builderAction] in a [BackgroundColorSpan].
*
* @see SpannableStringBuilder.inSpans
*/
inline fun SpannableStringBuilder.backgroundColor(
@ColorInt color: Int,
builderAction: SpannableStringBuilder.() -> Unit
) = inSpans(BackgroundColorSpan(color), builderAction = builderAction)
/**
* Wrap appended text in [builderAction] in a [StrikethroughSpan].
*
* @see SpannableStringBuilder.inSpans
*/
inline fun SpannableStringBuilder.strikeThrough(builderAction: SpannableStringBuilder.() -> Unit) =
inSpans(StrikethroughSpan(), builderAction = builderAction)
/**
* Wrap appended text in [builderAction] in a [RelativeSizeSpan].
*
* @see SpannableStringBuilder.inSpans
*/
inline fun SpannableStringBuilder.scale(
proportion: Float,
builderAction: SpannableStringBuilder.() -> Unit
) = inSpans(RelativeSizeSpan(proportion), builderAction = builderAction)
/**
* Wrap appended text in [builderAction] in a [SuperscriptSpan].
*
* @see SpannableStringBuilder.inSpans
*/
inline fun SpannableStringBuilder.superscript(builderAction: SpannableStringBuilder.() -> Unit) =
inSpans(SuperscriptSpan(), builderAction = builderAction)
/**
* Wrap appended text in [builderAction] in a [SubscriptSpan].
*
* @see SpannableStringBuilder.inSpans
*/
inline fun SpannableStringBuilder.subscript(builderAction: SpannableStringBuilder.() -> Unit) =
inSpans(SubscriptSpan(), builderAction = builderAction)
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