fix: Ui not visible if Control Panel show

app/src/main/kotlin/org/koitharu/kotatsu/reader/ui/ReaderActivity.kt

@@ -374,6 +374,9 @@ class ReaderActivity :
 			viewBinding.infoBar.isTimeVisible = isFullscreen
 			updateScrollTimerButton()
 			systemUiController.setSystemUiVisible(isUiVisible || !isFullscreen)
+			val topOffset = if (isUiVisible) viewBinding.appbarTop.height else 0
+			val bottomOffset = if (isUiVisible) (viewBinding.toolbarDocked?.height ?: 0) else 0
+			viewModel.setReaderUiOffsets(topOffset, bottomOffset)
 		}
 	}
 
@@ -395,6 +398,10 @@ class ReaderActivity :
 		viewBinding.infoBar.updatePadding(
 			top = systemBars.top,
 		)
+		viewModel.setReaderUiOffsets(
+			(if (viewBinding.appbarTop.isVisible) viewBinding.appbarTop.height else 0) + systemBars.top,
+			(if (viewBinding.toolbarDocked?.isVisible == true) (viewBinding.toolbarDocked?.height ?: 0) else 0) + systemBars.bottom,
+		)
 		return WindowInsetsCompat.Builder(insets)
 			.setInsets(WindowInsetsCompat.Type.systemBars(), Insets.NONE)
 			.build()

app/src/main/kotlin/org/koitharu/kotatsu/reader/ui/ReaderViewModel.kt

@@ -120,6 +120,9 @@ class ReaderViewModel @Inject constructor(
 	val onAskNsfwIncognito = MutableEventFlow<Unit>()
 	val uiState = MutableStateFlow<ReaderUiState?>(null)
 
+	val readerUiTopOffset = MutableStateFlow(0)
+	val readerUiBottomOffset = MutableStateFlow(0)
+
 	val isIncognitoMode = MutableStateFlow(savedStateHandle.get<Boolean>(ReaderIntent.EXTRA_INCOGNITO))
 
 	val content = MutableStateFlow(ReaderContent(emptyList(), null))
@@ -227,6 +230,11 @@ class ReaderViewModel @Inject constructor(
 		discordRpc.setIdle()
 	}
 
+	fun setReaderUiOffsets(top: Int, bottom: Int) {
+		readerUiTopOffset.value = top
+		readerUiBottomOffset.value = bottom
+	}
+
 	fun switchMode(newMode: ReaderMode) {
 		launchJob {
 			val manga = checkNotNull(getMangaOrNull())

app/src/main/kotlin/org/koitharu/kotatsu/reader/ui/pager/webtoon/WebtoonReaderFragment.kt

@@ -49,6 +49,12 @@ class WebtoonReaderFragment : BaseReaderFragment<FragmentReaderWebtoonBinding>()
 		super.onViewBindingCreated(binding, savedInstanceState)
 		var canGoPrev = true
 		var canGoNext = true
+		viewModel.readerUiTopOffset.observe(viewLifecycleOwner) { top ->
+			binding.feedbackTop.translationY = top.toFloat()
+		}
+		viewModel.readerUiBottomOffset.observe(viewLifecycleOwner) { bottom ->
+			binding.feedbackBottom.translationY = -bottom.toFloat()
+		}
 		with(binding.recyclerView) {
 			setHasFixedSize(true)
 			adapter = readerAdapter
@@ -59,17 +65,17 @@ class WebtoonReaderFragment : BaseReaderFragment<FragmentReaderWebtoonBinding>()
 			setOnPullGestureListener(object : WebtoonRecyclerView.OnPullGestureListener {
 				override fun onPullProgressTop(progress: Float) {
 					if (canGoPrev) {
-						binding.feedbackTop.setText(R.string.pull_to_prev_chapter)
+						setFeedbackText(binding.feedbackTop, getString(R.string.pull_to_prev_chapter))
 					} else {
-						binding.feedbackTop.setText(R.string.pull_top_no_prev)
+						setFeedbackText(binding.feedbackTop, getString(R.string.pull_top_no_prev))
 					}
 					updateFeedback(binding.feedbackTop, progress)
 				}
 				override fun onPullProgressBottom(progress: Float) {
 					if (canGoNext) {
-						binding.feedbackBottom.setText(R.string.pull_to_next_chapter)
+						setFeedbackText(binding.feedbackBottom, getString(R.string.pull_to_next_chapter))
 					} else {
-						binding.feedbackBottom.setText(R.string.pull_bottom_no_next)
+						setFeedbackText(binding.feedbackBottom, getString(R.string.pull_bottom_no_next))
 					}
 					updateFeedback(binding.feedbackBottom, progress)
 				}
@@ -241,3 +247,13 @@ private fun updateFeedback(tv: TextView, progress: Float) {
 private fun fadeOut(tv: TextView) {
 	tv.animate().alpha(0f).setDuration(150L).start()
 }
+
+private fun setFeedbackText(tv: TextView, text: CharSequence) {
+	if (tv.alpha <= 0f && text.isNotEmpty()) {
+		tv.alpha = 0f
+		tv.text = text
+		tv.animate().alpha(1f).setDuration(120L).start()
+	} else {
+		tv.text = text
+	}
+}