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Fix text glitches to new line in TypeAnimationTextView #4874

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merged 4 commits into from
Sep 18, 2024
Merged

Fix text glitches to new line in TypeAnimationTextView #4874

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0e0b39b
Fix text glitches to new line in TypeAnimationTextView
Aug 7, 2024
0bfc357
Merge branch 'develop' into bug/andy/fix-TypeAnimationTextView-glitch
Aug 12, 2024
9b4180d
Merge branch 'develop' into bug/andy/fix-TypeAnimationTextView-glitch
Aug 13, 2024
3ebfee9
Fix animation not completing
Aug 13, 2024
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33 changes: 22 additions & 11 deletions common/common-ui/src/main/java/com/duckduckgo/common/ui/view/TypeAnimationTextView.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -17,14 +17,22 @@
package com.duckduckgo.common.ui.view

import android.content.Context
import android.graphics.Color
import android.text.Spannable
import android.text.SpannableString
import android.text.Spanned
import android.text.style.ForegroundColorSpan
import android.util.AttributeSet
import androidx.appcompat.widget.AppCompatTextView
import com.duckduckgo.common.utils.extensions.html
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.Job
import kotlinx.coroutines.delay
import kotlinx.coroutines.launch
import java.text.BreakIterator
import java.text.StringCharacterIterator
import kotlin.coroutines.CoroutineContext
import kotlinx.coroutines.*

@Suppress("NoHardcodedCoroutineDispatcher")
class TypeAnimationTextView @JvmOverloads constructor(
Expand All @@ -38,7 +46,6 @@ class TypeAnimationTextView @JvmOverloads constructor(

private var typingAnimationJob: Job? = null
private var delayAfterAnimationInMs: Long = 300
private val breakIterator = BreakIterator.getCharacterInstance()

var typingDelayInMs: Long = 20
var textInDialog: Spanned? = null
Expand All @@ -48,7 +55,6 @@ class TypeAnimationTextView @JvmOverloads constructor(
isCancellable: Boolean = true,
afterAnimation: () -> Unit = {},
) {
textInDialog = textDialog.html(context)
if (isCancellable) {
setOnClickListener {
if (hasAnimationStarted()) {
Expand All @@ -57,24 +63,29 @@ class TypeAnimationTextView @JvmOverloads constructor(
}
}
}
if (typingAnimationJob?.isActive == true) typingAnimationJob?.cancel()
typingAnimationJob = launch {
textInDialog?.let { spanned ->

breakIterator.text = StringCharacterIterator(spanned.toString())
typingAnimationJob?.cancel()

var nextIndex = breakIterator.next()
while (nextIndex != BreakIterator.DONE) {
text = spanned.subSequence(0, nextIndex)
nextIndex = breakIterator.next()
textInDialog = textDialog.html(context).let(::SpannableString).also { textInDialog ->
typingAnimationJob = launch {
val transparentSpan = ForegroundColorSpan(Color.TRANSPARENT)
breakSequence(textInDialog).forEach { index ->
text = textInDialog.apply { setSpan(transparentSpan, index, length, Spannable.SPAN_INCLUSIVE_EXCLUSIVE) }
delay(typingDelayInMs)
}

delay(delayAfterAnimationInMs)
afterAnimation()
}
}
}

private fun breakSequence(charSequence: CharSequence) =
BreakIterator.getCharacterInstance()
.apply { text = StringCharacterIterator(charSequence.toString()) }
.let { generateSequence { it.next() } }
.takeWhile { it != BreakIterator.DONE }

fun hasAnimationStarted() = typingAnimationJob?.isActive == true

fun hasAnimationFinished() = typingAnimationJob?.isCompleted == true
Expand Down