[Messages/Compose] Add text styling support. (#85)

* [UI/Messages] Add draft text styling support.

* [UI/Messages] Improve mid-word span styling. Restore subscript and superscript styles.

* [UI/Messages] Replace framework spans with custom classes on replying.

* [Messages/Compose] Move UI-related code to separate classes.

* [UI/Messages] Disable text style buttons when not in focus.

* [Messages/Compose] Disable text styling on Vulcan.

* [UI/Messages] Add hint toasts to text style toggles.

* [UI/Messages] Add button to clear text styling.

* [Messages/Compose] Fix XML formatting.

app/src/main/java/pl/szczodrzynski/edziennik/Extensions.kt

@@ -1308,3 +1308,41 @@ fun Profile.getSchoolYearConstrains(): CalendarConstraints {
         .setEnd(dateYearEnd.inMillisUtc)
         .build()
 }
+
+fun CharSequence.getWordBounds(position: Int, onlyInWord: Boolean = false): Pair<Int, Int>? {
+    if (length == 0)
+        return null
+
+    // only if cursor between letters
+    if (onlyInWord) {
+        if (position < 1)
+            return null
+        if (position == length)
+            return null
+
+        val charBefore = this[position - 1]
+        if (!charBefore.isLetterOrDigit())
+            return null
+        val charAfter = this[position]
+        if (!charAfter.isLetterOrDigit())
+            return null
+    }
+
+    var rangeStart = substring(0 until position).indexOfLast { !it.isLetterOrDigit() }
+    if (rangeStart == -1) // no whitespace, set to first index
+        rangeStart = 0
+    else // cut the leading whitespace
+        rangeStart += 1
+
+    var rangeEnd = substring(position).indexOfFirst { !it.isLetterOrDigit() }
+    if (rangeEnd == -1) // no whitespace, set to last index
+        rangeEnd = length
+    else // append the substring offset
+        rangeEnd += position
+
+    if (!onlyInWord && rangeStart == rangeEnd)
+        return null
+    return rangeStart to rangeEnd
+}
+
+infix fun Int.hasSet(what: Int) = this and what == what

app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/messages/compose/MessagesComposeChipCreator.kt

@@ -0,0 +1,141 @@
+/*
+ * Copyright (c) Kuba Szczodrzyński 2021-10-4.
+ */
+
+package pl.szczodrzynski.edziennik.ui.modules.messages.compose
+
+import android.content.Context
+import android.graphics.drawable.BitmapDrawable
+import android.text.style.AbsoluteSizeSpan
+import android.text.style.ForegroundColorSpan
+import android.widget.Toast
+import com.google.android.material.dialog.MaterialAlertDialogBuilder
+import com.hootsuite.nachos.ChipConfiguration
+import com.hootsuite.nachos.NachoTextView
+import com.hootsuite.nachos.chip.ChipInfo
+import com.hootsuite.nachos.chip.ChipSpan
+import com.hootsuite.nachos.chip.ChipSpanChipCreator
+import pl.szczodrzynski.edziennik.*
+import pl.szczodrzynski.edziennik.data.db.entity.Teacher
+import pl.szczodrzynski.edziennik.ui.modules.messages.MessagesUtils
+import pl.szczodrzynski.edziennik.utils.Colors
+import pl.szczodrzynski.edziennik.utils.Themes
+import pl.szczodrzynski.navlib.elevateSurface
+
+class MessagesComposeChipCreator(
+    private val context: Context,
+    private val nacho: NachoTextView,
+    private val teacherList: List<Teacher>,
+) : ChipSpanChipCreator() {
+
+    override fun createChip(context: Context, text: CharSequence, data: Any?): ChipSpan? {
+        if (data == null || data !is Teacher)
+            return null
+        if (data.id !in -24L..0L) {
+            nacho.allChips.forEach {
+                if (it.data == data) {
+                    Toast.makeText(
+                        context,
+                        R.string.messages_compose_recipient_exists,
+                        Toast.LENGTH_SHORT
+                    ).show()
+                    return null
+                }
+            }
+            val chipSpan = ChipSpan(
+                context,
+                data.fullName,
+                BitmapDrawable(context.resources, data.image),
+                data
+            )
+            chipSpan.setIconBackgroundColor(Colors.stringToMaterialColor(data.fullName))
+            return chipSpan
+        }
+
+        val type = (data.id * -1).toInt()
+
+        val textColorPrimary = android.R.attr.textColorPrimary.resolveAttr(context)
+        val textColorSecondary = android.R.attr.textColorSecondary.resolveAttr(context)
+
+        val sortByCategory = type in listOf(
+            Teacher.TYPE_PARENTS_COUNCIL,
+            Teacher.TYPE_EDUCATOR,
+            Teacher.TYPE_STUDENT
+        )
+        val teachers = if (sortByCategory)
+            teacherList.sortedBy { it.typeDescription }
+        else
+            teacherList
+
+        val category = mutableListOf<Teacher>()
+        val categoryNames = mutableListOf<CharSequence>()
+        val categoryCheckedItems = mutableListOf<Boolean>()
+        teachers.forEach { teacher ->
+            if (!teacher.isType(type))
+                return@forEach
+
+            category += teacher
+            val name = teacher.fullName
+            val description = when (type) {
+                Teacher.TYPE_TEACHER -> null
+                Teacher.TYPE_PARENTS_COUNCIL -> teacher.typeDescription
+                Teacher.TYPE_SCHOOL_PARENTS_COUNCIL -> null
+                Teacher.TYPE_PEDAGOGUE -> null
+                Teacher.TYPE_LIBRARIAN -> null
+                Teacher.TYPE_SCHOOL_ADMIN -> null
+                Teacher.TYPE_SUPER_ADMIN -> null
+                Teacher.TYPE_SECRETARIAT -> null
+                Teacher.TYPE_PRINCIPAL -> null
+                Teacher.TYPE_EDUCATOR -> teacher.typeDescription
+                Teacher.TYPE_PARENT -> teacher.typeDescription
+                Teacher.TYPE_STUDENT -> teacher.typeDescription
+                Teacher.TYPE_SPECIALIST -> null
+                else -> teacher.typeDescription
+            }
+            categoryNames += listOfNotNull(
+                name.asSpannable(
+                    ForegroundColorSpan(textColorPrimary)
+                ),
+                description?.asSpannable(
+                    ForegroundColorSpan(textColorSecondary),
+                    AbsoluteSizeSpan(14.dp)
+                )
+            ).concat("\n")
+
+            // check the teacher if already added as a recipient
+            categoryCheckedItems += nacho.allChips.firstOrNull { it.data == teacher } != null
+        }
+
+        MaterialAlertDialogBuilder(context)
+            .setTitle("Dodaj odbiorców - " + Teacher.typeName(context, type))
+            //.setMessage(getString(R.string.messages_compose_recipients_text_format, Teacher.typeName(activity, type)))
+            .setPositiveButton("OK", null)
+            .setNeutralButton("Anuluj", null)
+            .setMultiChoiceItems(
+                categoryNames.toTypedArray(),
+                categoryCheckedItems.toBooleanArray()
+            ) { _, which, isChecked ->
+                val teacher = category[which]
+                if (isChecked) {
+                    val chipInfoList = mutableListOf<ChipInfo>()
+                    teacher.image =
+                        MessagesUtils.getProfileImage(48, 24, 16, 12, 1, teacher.fullName)
+                    chipInfoList.add(ChipInfo(teacher.fullName, teacher))
+                    nacho.addTextWithChips(chipInfoList)
+                } else {
+                    nacho.allChips.forEach {
+                        if (it.data == teacher)
+                            nacho.chipTokenizer?.deleteChipAndPadding(it, nacho.text)
+                    }
+                }
+            }
+            .show()
+        return null
+    }
+
+    override fun configureChip(chip: ChipSpan, chipConfiguration: ChipConfiguration) {
+        super.configureChip(chip, chipConfiguration)
+        chip.setBackgroundColor(elevateSurface(context, 8).toColorStateList())
+        chip.setTextColor(Themes.getPrimaryTextColor(context))
+    }
+}

app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/messages/compose/MessagesComposeChipTokenizer.kt

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) Kuba Szczodrzyński 2021-10-4.
+ */
+
+package pl.szczodrzynski.edziennik.ui.modules.messages.compose
+
+import android.content.Context
+import com.hootsuite.nachos.NachoTextView
+import com.hootsuite.nachos.chip.ChipSpan
+import com.hootsuite.nachos.tokenizer.SpanChipTokenizer
+import pl.szczodrzynski.edziennik.data.db.entity.Teacher
+
+class MessagesComposeChipTokenizer(
+    context: Context,
+    nacho: NachoTextView,
+    teacherList: List<Teacher>,
+) : SpanChipTokenizer<ChipSpan>(
+    context,
+    MessagesComposeChipCreator(
+        context = context,
+        nacho = nacho,
+        teacherList = teacherList
+    ),
+    ChipSpan::class.java
+)

app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/messages/compose/MessagesComposeFragment.kt

@@ -5,30 +5,21 @@
 package pl.szczodrzynski.edziennik.ui.modules.messages.compose
 
 import android.annotation.SuppressLint
-import android.content.Context
-import android.graphics.Typeface
-import android.graphics.drawable.BitmapDrawable
 import android.os.Bundle
-import android.text.Spannable
+import android.text.*
-import android.text.SpannableString
+import android.text.Spanned.*
-import android.text.SpannableStringBuilder
+import android.text.style.*
-import android.text.style.AbsoluteSizeSpan
-import android.text.style.ForegroundColorSpan
-import android.text.style.StyleSpan
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import android.widget.AutoCompleteTextView
-import android.widget.Toast
 import androidx.core.text.HtmlCompat
+import androidx.core.view.isVisible
 import androidx.core.widget.addTextChangedListener
 import androidx.fragment.app.Fragment
+import com.google.android.material.button.MaterialButtonToggleGroup
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
-import com.hootsuite.nachos.ChipConfiguration
 import com.hootsuite.nachos.chip.ChipInfo
-import com.hootsuite.nachos.chip.ChipSpan
-import com.hootsuite.nachos.chip.ChipSpanChipCreator
-import com.hootsuite.nachos.tokenizer.SpanChipTokenizer
 import com.mikepenz.iconics.typeface.library.community.material.CommunityMaterial
 import kotlinx.coroutines.*
 import org.greenrobot.eventbus.EventBus
@@ -47,13 +38,15 @@ import pl.szczodrzynski.edziennik.databinding.MessagesComposeFragmentBinding
 import pl.szczodrzynski.edziennik.ui.dialogs.MessagesConfigDialog
 import pl.szczodrzynski.edziennik.ui.modules.messages.MessagesUtils
 import pl.szczodrzynski.edziennik.ui.modules.messages.MessagesUtils.getProfileImage
-import pl.szczodrzynski.edziennik.utils.Colors
 import pl.szczodrzynski.edziennik.utils.Themes
-import pl.szczodrzynski.edziennik.utils.Themes.getPrimaryTextColor
+import pl.szczodrzynski.edziennik.utils.html.BetterHtml
 import pl.szczodrzynski.edziennik.utils.models.Date
 import pl.szczodrzynski.edziennik.utils.models.Time
+import pl.szczodrzynski.edziennik.utils.span.BoldSpan
+import pl.szczodrzynski.edziennik.utils.span.ItalicSpan
+import pl.szczodrzynski.edziennik.utils.span.SubscriptSizeSpan
+import pl.szczodrzynski.edziennik.utils.span.SuperscriptSizeSpan
 import pl.szczodrzynski.navlib.bottomsheet.items.BottomSheetPrimaryItem
-import pl.szczodrzynski.navlib.elevateSurface
 import kotlin.coroutines.CoroutineContext
 import kotlin.text.replace
 
@@ -76,11 +69,16 @@ class MessagesComposeFragment : Fragment(), CoroutineScope {
 
     private var teachers = mutableListOf<Teacher>()
 
+    private var watchFormatChecked = true
+    private var watchSelectionChanged = true
+    private val enableTextStyling
+        get() = app.profile.loginStoreType != LoginStore.LOGIN_TYPE_VULCAN
+
     override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
         activity = (getActivity() as MainActivity?) ?: return null
         context ?: return null
         app = activity.application as App
-        context!!.theme.applyStyle(Themes.appTheme, true)
+        requireContext().theme.applyStyle(Themes.appTheme, true)
         // activity, context and profile is valid
         b = MessagesComposeFragmentBinding.inflate(inflater)
         return b.root
@@ -103,40 +101,12 @@ class MessagesComposeFragment : Fragment(), CoroutineScope {
             // do your job
         }
 
-        /*b.fontStyleBold.icon = IconicsDrawable(activity, CommunityMaterial.Icon.cmd_format_bold)
+        if (App.devMode) {
-                .sizeDp(24)
+            b.textHtml.isVisible = true
-                .colorAttr(activity, R.attr.colorOnPrimary)
+            b.text.addTextChangedListener {
-        b.fontStyleItalic.icon = IconicsDrawable(activity, CommunityMaterial.Icon.cmd_format_italic)
+                b.textHtml.text = getHtmlText()
-                .sizeDp(24)
-                .colorAttr(activity, R.attr.colorOnPrimary)
-        b.fontStyleUnderline.icon = IconicsDrawable(activity, CommunityMaterial.Icon.cmd_format_underline)
-                .sizeDp(24)
-                .colorAttr(activity, R.attr.colorOnPrimary)
-
-        b.fontStyle.addOnButtonCheckedListener { _, checkedId, isChecked ->
-            val span: Any = when (checkedId) {
-                R.id.fontStyleBold -> StyleSpan(Typeface.BOLD)
-                R.id.fontStyleItalic -> StyleSpan(Typeface.ITALIC)
-                R.id.fontStyleUnderline -> UnderlineSpan()
-                else -> StyleSpan(Typeface.NORMAL)
-            }
-
-            if (isChecked) {
-                val flags = if (b.text.selectionStart == b.text.selectionEnd)
-                    SpannableString.SPAN_INCLUSIVE_INCLUSIVE
-                else
-                    SpannableString.SPAN_EXCLUSIVE_INCLUSIVE
-                b.text.text?.setSpan(span, b.text.selectionStart, b.text.selectionEnd, flags)
-            }
-            else {
-                b.text.text?.getSpans(b.text.selectionStart, b.text.selectionEnd, span.javaClass)?.forEach {
-                    if (it is StyleSpan && span is StyleSpan && it.style == span.style)
-                        b.text.text?.removeSpan(it)
-                    else if (it.javaClass == span.javaClass)
-                        b.text.text?.removeSpan(it)
             }
         }
-        }*/
 
         activity.bottomSheet.prependItem(
             BottomSheetPrimaryItem(true)
@@ -156,6 +126,50 @@ class MessagesComposeFragment : Fragment(), CoroutineScope {
         }
     }
 
+    private fun getHtmlText(): String {
+        val text = b.text.text ?: return ""
+
+        // apparently setting the spans to a different Spannable calls the original EditText's
+        // onSelectionChanged with selectionStart=-1, which in effect unchecks the format toggles
+        watchSelectionChanged = false
+        var textHtml = if (enableTextStyling) {
+            val spanned = SpannableString(text)
+            // remove zero-length spans, as they seem to affect
+            // the whole line when converted to HTML
+            spanned.getSpans(0, spanned.length, Any::class.java).forEach {
+                val spanStart = spanned.getSpanStart(it)
+                val spanEnd = spanned.getSpanEnd(it)
+                if (spanStart == spanEnd && it::class.java in BetterHtml.customSpanClasses)
+                    spanned.removeSpan(it)
+            }
+            HtmlCompat.toHtml(spanned, HtmlCompat.TO_HTML_PARAGRAPH_LINES_INDIVIDUAL)
+                .replace("\n", "")
+                .replace(" dir=\"ltr\"", "")
+                .replace("</b><b>", "")
+                .replace("</i><i>", "")
+                .replace("</u><u>", "")
+                .replace("</sub><sub>", "")
+                .replace("</sup><sup>", "")
+                .replace("p style=\"margin-top:0; margin-bottom:0;\"", "p")
+        } else {
+            text.toString()
+        }
+        watchSelectionChanged = true
+
+        if (app.profile.loginStoreType == LoginStore.LOGIN_TYPE_MOBIDZIENNIK) {
+            textHtml = textHtml
+                .replace("<br>", "<p>&nbsp;</p>")
+                .replace("<b>", "<strong>")
+                .replace("</b>", "</strong>")
+                .replace("<i>", "<em>")
+                .replace("</i>", "</em>")
+                .replace("<u>", "<span style=\"text-decoration: underline;\">")
+                .replace("</u>", "</span>")
+        }
+
+        return textHtml
+    }
+
     private fun getRecipientList() {
         if (System.currentTimeMillis() - app.profile.lastReceiversSync > 1 * DAY * 1000 && app.profile.loginStoreType != LoginStore.LOGIN_TYPE_VULCAN) {
             activity.snackbar("Pobieranie listy odbiorców...")
@@ -171,6 +185,80 @@ class MessagesComposeFragment : Fragment(), CoroutineScope {
         }
     }
 
+    @Suppress("UNUSED_PARAMETER")
+    private fun onFormatChecked(
+        group: MaterialButtonToggleGroup,
+        checkedId: Int,
+        isChecked: Boolean
+    ) {
+        if (!watchFormatChecked)
+            return
+        val span = when (checkedId) {
+            R.id.fontStyleBold -> BoldSpan()
+            R.id.fontStyleItalic -> ItalicSpan()
+            R.id.fontStyleUnderline -> UnderlineSpan()
+            R.id.fontStyleStrike -> StrikethroughSpan()
+            R.id.fontStyleSubscript -> SubscriptSizeSpan(10, dip = true)
+            R.id.fontStyleSuperscript -> SuperscriptSizeSpan(10, dip = true)
+            else -> return
+        }
+
+        // see comments in getHtmlText()
+        watchSelectionChanged = false
+        if (isChecked)
+            BetterHtml.applyFormat(span = span, editText = b.text)
+        else
+            BetterHtml.removeFormat(span = span, editText = b.text)
+        watchSelectionChanged = true
+
+        if (App.devMode)
+            b.textHtml.text = getHtmlText()
+    }
+
+    @Suppress("UNUSED_PARAMETER")
+    private fun onFormatClear(view: View) {
+        // shortened version on onFormatChecked(), removing all spans
+        watchSelectionChanged = false
+        BetterHtml.removeFormat(span = null, editText = b.text)
+        watchSelectionChanged = true
+        if (App.devMode)
+            b.textHtml.text = getHtmlText()
+        // force update of text style toggle states
+        onSelectionChanged(b.text.selectionStart, b.text.selectionEnd)
+    }
+
+    private fun onSelectionChanged(selectionStart: Int, selectionEnd: Int) {
+        if (!watchSelectionChanged)
+            return
+        val spanned = b.text.text ?: return
+        val spans = spanned.getSpans(selectionStart, selectionEnd, Any::class.java).mapNotNull {
+            if (it::class.java !in BetterHtml.customSpanClasses)
+                return@mapNotNull null
+            val spanStart = spanned.getSpanStart(it)
+            val spanEnd = spanned.getSpanEnd(it)
+            // remove 0-length spans after navigating out of them
+            if (spanStart == spanEnd)
+                spanned.removeSpan(it)
+            else if (spanned.getSpanFlags(it) hasSet SPAN_EXCLUSIVE_EXCLUSIVE)
+                spanned.setSpan(it, spanStart, spanEnd, SPAN_EXCLUSIVE_INCLUSIVE)
+
+            // names are helpful here
+            val isNotAfterWord = selectionEnd <= spanEnd
+            val isSelectionInWord = selectionStart != selectionEnd && selectionStart >= spanStart
+            val isCursorInWord = selectionStart == selectionEnd && selectionStart > spanStart
+            val isChecked = (isCursorInWord || isSelectionInWord) && isNotAfterWord
+            if (isChecked) it::class.java else null
+        }
+        watchFormatChecked = false
+        b.fontStyleBold.isChecked = BoldSpan::class.java in spans
+        b.fontStyleItalic.isChecked = ItalicSpan::class.java in spans
+        b.fontStyleUnderline.isChecked = UnderlineSpan::class.java in spans
+        b.fontStyleStrike.isChecked = StrikethroughSpan::class.java in spans
+        b.fontStyleSubscript.isChecked = SubscriptSizeSpan::class.java in spans
+        b.fontStyleSuperscript.isChecked = SuperscriptSizeSpan::class.java in spans
+        watchFormatChecked = true
+    }
+
     private fun createView() {
         b.recipientsLayout.setBoxCornerRadii(0f, 0f, 0f, 0f)
         b.subjectLayout.setBoxCornerRadii(0f, 0f, 0f, 0f)
@@ -203,107 +291,7 @@ class MessagesComposeFragment : Fragment(), CoroutineScope {
             else -> -1
         }
 
-        b.recipients.chipTokenizer = SpanChipTokenizer<ChipSpan>(activity, object : ChipSpanChipCreator() {
+        b.recipients.chipTokenizer = MessagesComposeChipTokenizer(activity, b.recipients, teachers)
-            override fun createChip(context: Context, text: CharSequence, data: Any?): ChipSpan? {
-                if (data == null || data !is Teacher)
-                    return null
-                if (data.id !in -24L..0L) {
-                    b.recipients.allChips.forEach {
-                        if (it.data == data) {
-                            Toast.makeText(activity, R.string.messages_compose_recipient_exists, Toast.LENGTH_SHORT).show()
-                            return null
-                        }
-                    }
-                    val chipSpan = ChipSpan(context, data.fullName, BitmapDrawable(context.resources, data.image), data)
-                    chipSpan.setIconBackgroundColor(Colors.stringToMaterialColor(data.fullName))
-                    return chipSpan
-                }
-
-                val type = (data.id * -1).toInt()
-
-                val textColorPrimary = android.R.attr.textColorPrimary.resolveAttr(activity)
-                val textColorSecondary = android.R.attr.textColorSecondary.resolveAttr(activity)
-
-                val sortByCategory = type in listOf(
-                        Teacher.TYPE_PARENTS_COUNCIL,
-                        Teacher.TYPE_EDUCATOR,
-                        Teacher.TYPE_STUDENT
-                )
-                val teachers = if (sortByCategory)
-                    teachers.sortedBy { it.typeDescription }
-                else
-                    teachers
-
-                val category = mutableListOf<Teacher>()
-                val categoryNames = mutableListOf<CharSequence>()
-                val categoryCheckedItems = mutableListOf<Boolean>()
-                teachers.forEach { teacher ->
-                    if (!teacher.isType(type))
-                        return@forEach
-
-                    category += teacher
-                    val name = teacher.fullName
-                    val description = when (type) {
-                        Teacher.TYPE_TEACHER -> null
-                        Teacher.TYPE_PARENTS_COUNCIL -> teacher.typeDescription
-                        Teacher.TYPE_SCHOOL_PARENTS_COUNCIL -> null
-                        Teacher.TYPE_PEDAGOGUE -> null
-                        Teacher.TYPE_LIBRARIAN -> null
-                        Teacher.TYPE_SCHOOL_ADMIN -> null
-                        Teacher.TYPE_SUPER_ADMIN -> null
-                        Teacher.TYPE_SECRETARIAT -> null
-                        Teacher.TYPE_PRINCIPAL -> null
-                        Teacher.TYPE_EDUCATOR -> teacher.typeDescription
-                        Teacher.TYPE_PARENT -> teacher.typeDescription
-                        Teacher.TYPE_STUDENT -> teacher.typeDescription
-                        Teacher.TYPE_SPECIALIST -> null
-                        else -> teacher.typeDescription
-                    }
-                    categoryNames += listOfNotNull(
-                            name.asSpannable(
-                                    ForegroundColorSpan(textColorPrimary)
-                            ),
-                            description?.asSpannable(
-                                    ForegroundColorSpan(textColorSecondary),
-                                    AbsoluteSizeSpan(14.dp)
-                            )
-                    ).concat("\n")
-
-                    // check the teacher if already added as a recipient
-                    categoryCheckedItems += b.recipients.allChips.firstOrNull { it.data == teacher } != null
-                }
-
-                MaterialAlertDialogBuilder(activity)
-                        .setTitle("Dodaj odbiorców - "+ Teacher.typeName(activity, type))
-                        //.setMessage(getString(R.string.messages_compose_recipients_text_format, Teacher.typeName(activity, type)))
-                        .setPositiveButton("OK", null)
-                        .setNeutralButton("Anuluj", null)
-                        .setMultiChoiceItems(categoryNames.toTypedArray(), categoryCheckedItems.toBooleanArray()) { _, which, isChecked ->
-                            val teacher = category[which]
-                            if (isChecked) {
-                                val chipInfoList = mutableListOf<ChipInfo>()
-                                teacher.image = getProfileImage(48, 24, 16, 12, 1, teacher.fullName)
-                                chipInfoList.add(ChipInfo(teacher.fullName, teacher))
-                                b.recipients.addTextWithChips(chipInfoList)
-                            }
-                            else {
-                                b.recipients.allChips.forEach {
-                                    if (it.data == teacher)
-                                        b.recipients.chipTokenizer?.deleteChipAndPadding(it, b.recipients.text)
-                                }
-                            }
-                        }
-                        .show()
-                return null
-            }
-
-            override fun configureChip(chip: ChipSpan, chipConfiguration: ChipConfiguration) {
-                super.configureChip(chip, chipConfiguration)
-                chip.setBackgroundColor(elevateSurface(activity, 8).toColorStateList())
-                chip.setTextColor(getPrimaryTextColor(activity))
-            }
-        }, ChipSpan::class.java)
-
         b.recipients.setIllegalCharacterIdentifier { c ->
             c.toString().matches("[\\n;:_ ]".toRegex())
         }
@@ -330,6 +318,55 @@ class MessagesComposeFragment : Fragment(), CoroutineScope {
         b.subjectLayout.isEnabled = false
         b.textLayout.isEnabled = false
 
+        b.fontStyleLayout.isVisible = enableTextStyling
+        b.fontStyleBold.isEnabled = false
+        b.fontStyleItalic.isEnabled = false
+        b.fontStyleUnderline.isEnabled = false
+        b.fontStyleStrike.isEnabled = false
+        b.fontStyleSubscript.isEnabled = false
+        b.fontStyleSuperscript.isEnabled = false
+        b.fontStyleClear.isEnabled = false
+        b.text.setOnFocusChangeListener { _, hasFocus ->
+            b.fontStyleBold.isEnabled = hasFocus
+            b.fontStyleItalic.isEnabled = hasFocus
+            b.fontStyleUnderline.isEnabled = hasFocus
+            b.fontStyleStrike.isEnabled = hasFocus
+            b.fontStyleSubscript.isEnabled = hasFocus
+            b.fontStyleSuperscript.isEnabled = hasFocus
+            b.fontStyleClear.isEnabled = hasFocus
+        }
+
+        b.fontStyleBold.text = CommunityMaterial.Icon2.cmd_format_bold.character.toString()
+        b.fontStyleItalic.text = CommunityMaterial.Icon2.cmd_format_italic.character.toString()
+        b.fontStyleUnderline.text = CommunityMaterial.Icon2.cmd_format_underline.character.toString()
+        b.fontStyleStrike.text = CommunityMaterial.Icon2.cmd_format_strikethrough.character.toString()
+        b.fontStyleSubscript.text = CommunityMaterial.Icon2.cmd_format_subscript.character.toString()
+        b.fontStyleSuperscript.text = CommunityMaterial.Icon2.cmd_format_superscript.character.toString()
+        b.fontStyleBold.attachToastHint(R.string.hint_style_bold)
+        b.fontStyleItalic.attachToastHint(R.string.hint_style_italic)
+        b.fontStyleUnderline.attachToastHint(R.string.hint_style_underline)
+        b.fontStyleStrike.attachToastHint(R.string.hint_style_strike)
+        b.fontStyleSubscript.attachToastHint(R.string.hint_style_subscript)
+        b.fontStyleSuperscript.attachToastHint(R.string.hint_style_superscript)
+
+        /*b.fontStyleBold.shapeAppearanceModel = b.fontStyleBold.shapeAppearanceModel
+            .toBuilder()
+            .setBottomLeftCornerSize(0f)
+            .build()
+        b.fontStyleSuperscript.shapeAppearanceModel = b.fontStyleBold.shapeAppearanceModel
+            .toBuilder()
+            .setBottomRightCornerSize(0f)
+            .build()
+        b.fontStyleClear.shapeAppearanceModel = b.fontStyleClear.shapeAppearanceModel
+            .toBuilder()
+            .setTopLeftCornerSize(0f)
+            .setTopRightCornerSize(0f)
+            .build()*/
+
+        b.fontStyle.addOnButtonCheckedListener(this::onFormatChecked)
+        b.fontStyleClear.setOnClickListener(this::onFormatClear)
+        b.text.setSelectionChangedListener(this::onSelectionChanged)
+
         activity.navView.bottomBar.apply {
             fabEnable = true
             fabExtendedText = getString(R.string.messages_compose_send)
@@ -382,11 +419,11 @@ class MessagesComposeFragment : Fragment(), CoroutineScope {
                 val dateString = getString(R.string.messages_date_time_format, Date.fromMillis(msg.addedDate).formattedStringShort, Time.fromMillis(msg.addedDate).stringHM)
                 // add original message info
                 span.appendText("W dniu ")
-                span.appendSpan(dateString, StyleSpan(Typeface.ITALIC), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
+                span.appendSpan(dateString, ItalicSpan(), SPAN_EXCLUSIVE_EXCLUSIVE)
                 span.appendText(", ")
-                span.appendSpan(msg.senderName.fixName(), StyleSpan(Typeface.ITALIC), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
+                span.appendSpan(msg.senderName.fixName(), ItalicSpan(), SPAN_EXCLUSIVE_EXCLUSIVE)
                 span.appendText(" napisał(a):")
-                span.setSpan(StyleSpan(Typeface.BOLD), 0, span.length, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
+                span.setSpan(BoldSpan(), 0, span.length, SPAN_EXCLUSIVE_EXCLUSIVE)
                 span.appendText("\n\n")
 
                 if (arguments?.getString("type") == "reply") {
@@ -422,6 +459,8 @@ class MessagesComposeFragment : Fragment(), CoroutineScope {
             b.subject.setText(subject)
             b.text.apply {
                 text = span.appendText(body)
+                if (!enableTextStyling)
+                    setText(text?.toString())
                 setSelection(0)
             }
             b.root.scrollTo(0, 0)
@@ -494,30 +533,7 @@ class MessagesComposeFragment : Fragment(), CoroutineScope {
         if (b.textLayout.counterMaxLength != -1 && b.text.length() > b.textLayout.counterMaxLength)
             return
 
-        var textHtml = if (app.profile.loginStoreType != LoginStore.LOGIN_TYPE_VULCAN) {
+        val textHtml = getHtmlText()
-            HtmlCompat.toHtml(SpannableString(text), HtmlCompat.TO_HTML_PARAGRAPH_LINES_INDIVIDUAL)
-                    .replace("\n", "")
-                    .replace(" dir=\"ltr\"", "")
-        }
-        else {
-            text.toString()
-        }
-
-        textHtml = textHtml
-            .replace("</b><b>", "")
-            .replace("</i><i>", "")
-            .replace("p style=\"margin-top:0; margin-bottom:0;\"", "p")
-
-        if (app.profile.loginStoreType == LoginStore.LOGIN_TYPE_MOBIDZIENNIK) {
-            textHtml = textHtml
-                    .replace("</p><br>", "</p>")
-                    .replace("<b>", "<strong>")
-                    .replace("</b>", "</strong>")
-                    .replace("<i>", "<em>")
-                    .replace("</i>", "</em>")
-                    .replace("<u>", "<span style=\"text-decoration: underline;\">")
-                    .replace("</u>", "</span>")
-        }
 
         activity.bottomSheet.hideKeyboard()
 
@@ -525,7 +541,7 @@ class MessagesComposeFragment : Fragment(), CoroutineScope {
                 .setTitle(R.string.messages_compose_confirm_title)
                 .setMessage(R.string.messages_compose_confirm_text)
                 .setPositiveButton(R.string.send) { _, _ ->
-                    EdziennikTask.messageSend(App.profileId, recipients, subject.trim(), textHtml.trim()).enqueue(activity)
+                    EdziennikTask.messageSend(App.profileId, recipients, subject.trim(), textHtml).enqueue(activity)
                 }
                 .setNegativeButton(R.string.cancel, null)
                 .show()

app/src/main/java/pl/szczodrzynski/edziennik/utils/TextInputKeyboardEdit.kt

@@ -18,6 +18,7 @@ class TextInputKeyboardEdit : AppCompatEditText {
      * Keyboard Listener
      */
     internal var listener: KeyboardListener? = null
+    private var selectionListener: ((Int, Int) -> Unit)? = null
 
     constructor(context: Context) : super(context)
 
@@ -27,14 +28,12 @@ class TextInputKeyboardEdit : AppCompatEditText {
 
     override fun onFocusChanged(focused: Boolean, direction: Int, previouslyFocusedRect: Rect?) {
         super.onFocusChanged(focused, direction, previouslyFocusedRect)
-        if (listener != null)
+        listener?.onStateChanged(this, true)
-            listener!!.onStateChanged(this, true)
     }
 
     override fun onKeyPreIme(keyCode: Int, @NonNull event: KeyEvent): Boolean {
         if (event.keyCode == KEYCODE_BACK && event.action == KeyEvent.ACTION_UP) {
-            if (listener != null)
+            listener?.onStateChanged(this, false)
-                listener!!.onStateChanged(this, false)
 
             // Hide cursor
             isFocusable = false
@@ -50,6 +49,15 @@ class TextInputKeyboardEdit : AppCompatEditText {
         this.listener = listener
     }
 
+    fun setSelectionChangedListener(listener: ((selectionStart: Int, selectionEnd: Int) -> Unit)?) {
+        this.selectionListener = listener
+    }
+
+    override fun onSelectionChanged(selStart: Int, selEnd: Int) {
+        super.onSelectionChanged(selStart, selEnd)
+        selectionListener?.invoke(selStart, selEnd)
+    }
+
     interface KeyboardListener {
         fun onStateChanged(keyboardEditText: TextInputKeyboardEdit, showing: Boolean)
     }

app/src/main/java/pl/szczodrzynski/edziennik/utils/html/BetterHtml.kt

@@ -6,17 +6,32 @@ package pl.szczodrzynski.edziennik.utils.html
 
 import android.content.Context
 import android.graphics.Color
+import android.graphics.Typeface
+import android.text.Editable
 import android.text.SpannableStringBuilder
 import android.text.Spanned
-import android.text.style.BulletSpan
+import android.text.Spanned.*
+import android.text.style.*
+import androidx.appcompat.widget.AppCompatEditText
 import androidx.core.graphics.ColorUtils
 import androidx.core.text.HtmlCompat
 import pl.szczodrzynski.edziennik.dp
+import pl.szczodrzynski.edziennik.getWordBounds
 import pl.szczodrzynski.edziennik.resolveAttr
+import pl.szczodrzynski.edziennik.utils.span.*
 import pl.szczodrzynski.navlib.blendColors
 
 object BetterHtml {
 
+    val customSpanClasses = listOf(
+        BoldSpan::class.java,
+        ItalicSpan::class.java,
+        UnderlineSpan::class.java,
+        StrikethroughSpan::class.java,
+        SubscriptSizeSpan::class.java,
+        SuperscriptSizeSpan::class.java,
+    )
+
     @JvmStatic
     fun fromHtml(context: Context, html: String): Spanned {
         val hexPattern = "(#[a-fA-F0-9]{6})"
@@ -39,7 +54,11 @@ object BetterHtml {
             var blendAmount = 1
             var numIterations = 0
 
-            while (numIterations < 100 && ColorUtils.calculateContrast(colorBackground, newColor) < 4.5f) {
+            while (numIterations < 100 && ColorUtils.calculateContrast(
+                    colorBackground,
+                    newColor
+                ) < 4.5f
+            ) {
                 blendAmount += 2
                 newColor = blendColors(color, blendAmount shl 24 or textColorPrimary)
                 numIterations++
@@ -65,20 +84,103 @@ object BetterHtml {
             LiTagHandler()
         )
 
-        val spannableBuilder = SpannableStringBuilder(htmlSpannable)
+        val spanned = SpannableStringBuilder(htmlSpannable)
-        val bulletSpans = spannableBuilder.getSpans(0, spannableBuilder.length, BulletSpan::class.java)
+        spanned.getSpans(0, spanned.length, Any::class.java).forEach {
-        bulletSpans.forEach {
+            val spanStart = spanned.getSpanStart(it)
-            val start = spannableBuilder.getSpanStart(it)
+            val spanEnd = spanned.getSpanEnd(it)
-            val end = spannableBuilder.getSpanEnd(it)
+            val spanFlags = spanned.getSpanFlags(it)
-            spannableBuilder.removeSpan(it)
+
-            spannableBuilder.setSpan(
+            val newSpan: Any? = when (it) {
-                    ImprovedBulletSpan(bulletRadius = 3.dp, startWidth = 24.dp, gapWidth = 8.dp),
+                is BulletSpan -> ImprovedBulletSpan(
-                    start,
+                    bulletRadius = 3.dp,
-                    end,
+                    startWidth = 24.dp,
-                    Spanned.SPAN_INCLUSIVE_EXCLUSIVE
+                    gapWidth = 8.dp
                 )
+                is StyleSpan -> when (it.style) {
+                    Typeface.BOLD -> BoldSpan()
+                    Typeface.ITALIC -> ItalicSpan()
+                    else -> null
+                }
+                is SubscriptSpan -> SubscriptSizeSpan(size = 10, dip = true)
+                is SuperscriptSpan -> SuperscriptSizeSpan(size = 10, dip = true)
+                else -> null
             }
 
-        return spannableBuilder
+            if (newSpan != null) {
+                spanned.removeSpan(it)
+                spanned.setSpan(newSpan, spanStart, spanEnd, spanFlags)
+            }
+        }
+
+        return spanned
+    }
+
+    fun applyFormat(span: Any, editText: AppCompatEditText) {
+        applyFormat(span, editText.text ?: return, editText.selectionStart, editText.selectionEnd)
+    }
+
+    fun removeFormat(span: Any?, editText: AppCompatEditText) {
+        removeFormat(span, editText.text ?: return, editText.selectionStart, editText.selectionEnd)
+    }
+
+    fun applyFormat(span: Any, spanned: Editable, selectionStart: Int, selectionEnd: Int) {
+        if (selectionStart == -1 || selectionEnd == -1) return
+        val cursorOnly = selectionStart == selectionEnd
+
+        val wordBounds = spanned.getWordBounds(selectionStart, onlyInWord = true)
+        if (cursorOnly && wordBounds != null) {
+            // use the detected word bounds instead of cursor/selection
+            val (start, end) = wordBounds
+            spanned.setSpan(span, start, end, SPAN_EXCLUSIVE_INCLUSIVE)
+        } else {
+            val spanFlags = if (cursorOnly)
+                SPAN_INCLUSIVE_INCLUSIVE
+            else
+                SPAN_EXCLUSIVE_INCLUSIVE
+            spanned.setSpan(span, selectionStart, selectionEnd, spanFlags)
+        }
+    }
+
+    fun removeFormat(span: Any?, spanned: Editable, selectionStart: Int, selectionEnd: Int) {
+        if (selectionStart == -1 || selectionEnd == -1) return
+        val cursorOnly = selectionStart == selectionEnd
+
+        val spanClass = span?.javaClass ?: Any::class.java
+        spanned.getSpans(selectionStart, selectionEnd, spanClass).forEach {
+            if (span == null && it::class.java !in customSpanClasses)
+                return@forEach
+            val spanStart = spanned.getSpanStart(it)
+            val spanEnd = spanned.getSpanEnd(it)
+            val wordBounds = spanned.getWordBounds(selectionStart, onlyInWord = true)
+
+            val (newSpanStart, newSpanEnd, newSpanFlags) = when {
+                !cursorOnly -> {
+                    // cut the selected range out of the span
+                    Triple(selectionStart, selectionEnd, SPAN_EXCLUSIVE_INCLUSIVE)
+                }
+                wordBounds == null -> {
+                    // this allows to change spans mid-word - EXCLUSIVE so the style does
+                    // not apply to characters typed later
+                    // it's set back to INCLUSIVE when the cursor enters the word again
+                    // (onSelectionChanged)
+                    Triple(selectionStart, selectionEnd, SPAN_EXCLUSIVE_EXCLUSIVE)
+                }
+                else /* wordBounds != null */ -> {
+                    // a word is selected, slice the span in two
+                    Triple(wordBounds.first, wordBounds.second, SPAN_EXCLUSIVE_INCLUSIVE)
+                }
+            }
+
+            // remove the existing span
+            spanned.removeSpan(it)
+            // "clone" the span so it can be applied twice, if needed
+            // (can't use 'span' from the parameters as it's nullable)
+            val itClone = it::class.java.newInstance()
+            // reapply the span wherever needed
+            if (spanStart < newSpanStart)
+                spanned.setSpan(it, spanStart, newSpanStart, newSpanFlags)
+            if (spanEnd > newSpanEnd)
+                spanned.setSpan(itClone, newSpanEnd, spanEnd, newSpanFlags)
+        }
     }
 }

app/src/main/java/pl/szczodrzynski/edziennik/utils/span/BoldSpan.kt

@@ -0,0 +1,10 @@
+/*
+ * Copyright (c) Kuba Szczodrzyński 2021-10-3.
+ */
+
+package pl.szczodrzynski.edziennik.utils.span
+
+import android.graphics.Typeface
+import android.text.style.StyleSpan
+
+class BoldSpan : StyleSpan(Typeface.BOLD)

app/src/main/java/pl/szczodrzynski/edziennik/utils/span/ImprovedBulletSpan.kt

@@ -6,7 +6,7 @@
  * https://github.com/davidbilik/bullet-span-sample/blob/master/app/src/main/java/cz/davidbilik/bulletsample/ImprovedBulletSpan.kt
  */
 
-package pl.szczodrzynski.edziennik.utils.html
+package pl.szczodrzynski.edziennik.utils.span
 
 import android.graphics.Canvas
 import android.graphics.Paint

app/src/main/java/pl/szczodrzynski/edziennik/utils/span/ItalicSpan.kt

@@ -0,0 +1,10 @@
+/*
+ * Copyright (c) Kuba Szczodrzyński 2021-10-3.
+ */
+
+package pl.szczodrzynski.edziennik.utils.span
+
+import android.graphics.Typeface
+import android.text.style.StyleSpan
+
+class ItalicSpan : StyleSpan(Typeface.ITALIC)

app/src/main/java/pl/szczodrzynski/edziennik/utils/span/SubscriptSizeSpan.kt

@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) Kuba Szczodrzyński 2021-10-3.
+ */
+
+package pl.szczodrzynski.edziennik.utils.span
+
+import android.text.TextPaint
+import android.text.style.SubscriptSpan
+
+class SubscriptSizeSpan(
+    private val size: Int,
+    private val dip: Boolean,
+) : SubscriptSpan() {
+
+    override fun updateDrawState(textPaint: TextPaint) {
+        super.updateDrawState(textPaint)
+        if (dip) {
+            textPaint.textSize = size * textPaint.density
+        } else {
+            textPaint.textSize = size.toFloat()
+        }
+    }
+
+    override fun updateMeasureState(textPaint: TextPaint) {
+        super.updateMeasureState(textPaint)
+        if (dip) {
+            textPaint.textSize = size * textPaint.density
+        } else {
+            textPaint.textSize = size.toFloat()
+        }
+    }
+}

app/src/main/java/pl/szczodrzynski/edziennik/utils/span/SuperscriptSizeSpan.kt

@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) Kuba Szczodrzyński 2021-10-3.
+ */
+
+package pl.szczodrzynski.edziennik.utils.span
+
+import android.text.TextPaint
+import android.text.style.SuperscriptSpan
+
+class SuperscriptSizeSpan(
+    private val size: Int,
+    private val dip: Boolean,
+) : SuperscriptSpan() {
+
+    override fun updateDrawState(textPaint: TextPaint) {
+        super.updateDrawState(textPaint)
+        if (dip) {
+            textPaint.textSize = size * textPaint.density
+        } else {
+            textPaint.textSize = size.toFloat()
+        }
+    }
+
+    override fun updateMeasureState(textPaint: TextPaint) {
+        super.updateMeasureState(textPaint)
+        if (dip) {
+            textPaint.textSize = size * textPaint.density
+        } else {
+            textPaint.textSize = size.toFloat()
+        }
+    }
+}

app/src/main/res/layout/messages_compose_fragment.xml

@@ -6,15 +6,21 @@
 <layout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools">
+
+    <data>
+
+        <import type="com.mikepenz.iconics.typeface.library.community.material.CommunityMaterial" />
+    </data>
+
     <ScrollView
         android:layout_width="match_parent"
         android:layout_height="match_parent">
+
         <LinearLayout
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:paddingBottom="40dp"
+            android:orientation="vertical"
-            android:orientation="vertical"><!-- half of the FAB's size -->
+            android:paddingBottom="40dp"><!-- half of the FAB's size -->
-
             <com.google.android.material.textfield.TextInputLayout
                 android:id="@+id/recipientsLayout"
                 style="@style/Widget.MaterialComponents.TextInputLayout.FilledBox.Dense"
@@ -22,8 +28,8 @@
                 android:layout_height="wrap_content"
                 app:boxBackgroundColor="@android:color/transparent"
                 app:boxBackgroundMode="filled"
-                app:endIconMode="custom"
+                app:endIconDrawable="@drawable/dropdown_arrow"
-                app:endIconDrawable="@drawable/dropdown_arrow">
+                app:endIconMode="custom">
 
                 <com.hootsuite.nachos.NachoTextView
                     android:id="@+id/recipients"
@@ -34,7 +40,6 @@
                     android:focusableInTouchMode="true"
                     android:focusedByDefault="true"
                     android:hint="@string/messages_compose_to_hint" />
-
             </com.google.android.material.textfield.TextInputLayout>
 
             <com.google.android.material.textfield.TextInputLayout
@@ -55,10 +60,9 @@
                     android:focusable="true"
                     android:focusableInTouchMode="true"
                     android:hint="@string/messages_compose_subject_hint"
+                    android:inputType="textCapSentences|textAutoCorrect|textShortMessage|textAutoComplete|textEmailSubject"
                     android:singleLine="true"
-                    tools:text="kachoomba"
+                    tools:text="kachoomba" />
-                    android:inputType="textCapSentences|textAutoCorrect|textShortMessage|textAutoComplete|textEmailSubject"/>
-
             </com.google.android.material.textfield.TextInputLayout>
 
             <com.google.android.material.textfield.TextInputLayout
@@ -69,66 +73,131 @@
                 app:boxBackgroundMode="filled"
                 app:counterEnabled="true"
                 tools:counterMaxLength="1983">
+
                 <pl.szczodrzynski.edziennik.utils.TextInputKeyboardEdit
                     android:id="@+id/text"
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
+                    android:ems="10"
                     android:focusable="true"
                     android:focusableInTouchMode="true"
-                    android:minLines="3"
-                    android:hint="@string/messages_compose_text_hint"
-                    android:ems="10"
                     android:gravity="start|top"
-                    tools:text="Witam,\n\nchciałem przekazać bardzo ważną wiadomość.\nJest to cytat znanej osoby.\n\n&quot;To jest tak, ale nie. Pamiętaj żeby oczywiście&quot;\n\nCytat ma bardzo duże przesłanie i ogromny wpływ na dzisiejszą kulturę i rozwój współczesnej cywilizacji.\n\nJako zadanie domowe, należy wypisać 5 pierwszych liczb pierwszych. Uzasadnij decyzję, odwołując się do cytatu i 3 innych przykładów z literatury lub filmu.\n\nPozdrawiam,\nJa."
+                    android:hint="@string/messages_compose_text_hint"
-                    android:inputType="textMultiLine|textAutoCorrect|textLongMessage|textAutoComplete|textCapSentences" />
+                    android:inputType="textMultiLine|textAutoCorrect|textLongMessage|textAutoComplete|textCapSentences"
+                    android:minLines="3"
+                    tools:text="Witam,\n\nchciałem przekazać bardzo ważną wiadomość.\nJest to cytat znanej osoby.\n\n&quot;To jest tak, ale nie. Pamiętaj żeby oczywiście&quot;\n\nCytat ma bardzo duże przesłanie i ogromny wpływ na dzisiejszą kulturę i rozwój współczesnej cywilizacji.\n\nJako zadanie domowe, należy wypisać 5 pierwszych liczb pierwszych. Uzasadnij decyzję, odwołując się do cytatu i 3 innych przykładów z literatury lub filmu.\n\nPozdrawiam,\nJa." />
             </com.google.android.material.textfield.TextInputLayout>
 
-            <!--<com.google.android.material.button.MaterialButtonToggleGroup
+            <LinearLayout
+                android:id="@+id/fontStyleLayout"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center_horizontal"
+                android:orientation="vertical">
+
+                <com.google.android.material.button.MaterialButtonToggleGroup
                     android:id="@+id/fontStyle"
                     android:layout_width="wrap_content"
                     android:layout_height="wrap_content"
-                android:layout_marginHorizontal="8dp"
+                    android:layout_marginHorizontal="8dp">
-                android:layout_marginTop="4dp">
 
                     <com.google.android.material.button.MaterialButton
                         android:id="@+id/fontStyleBold"
                         style="@style/Widget.MaterialComponents.Button.OutlinedButton"
                         android:layout_width="wrap_content"
                         android:layout_height="wrap_content"
+                        android:fontFamily="@font/community_material_font_v5_8_55"
                         android:minWidth="48dp"
-                    tools:icon="@sample/format-bold"
+                        android:textSize="20sp"
-                    app:iconPadding="0dp"/>
+                        app:iconPadding="0dp"
+                        tools:text="\uf674" />
 
                     <com.google.android.material.button.MaterialButton
                         android:id="@+id/fontStyleItalic"
                         style="@style/Widget.MaterialComponents.Button.OutlinedButton"
                         android:layout_width="wrap_content"
                         android:layout_height="wrap_content"
+                        android:fontFamily="@font/community_material_font_v5_8_55"
                         android:minWidth="48dp"
-                    tools:icon="@sample/format-bold"
+                        android:textSize="20sp"
-                    app:iconPadding="0dp"/>
+                        app:iconPadding="0dp"
+                        tools:text="\uf691" />
 
                     <com.google.android.material.button.MaterialButton
                         android:id="@+id/fontStyleUnderline"
                         style="@style/Widget.MaterialComponents.Button.OutlinedButton"
                         android:layout_width="wrap_content"
                         android:layout_height="wrap_content"
+                        android:fontFamily="@font/community_material_font_v5_8_55"
                         android:minWidth="48dp"
-                    tools:icon="@sample/format-bold"
+                        android:textSize="20sp"
-                    app:iconPadding="0dp"/>
+                        app:iconPadding="0dp"
+                        tools:text="\uf6c5" />
 
-            </com.google.android.material.button.MaterialButtonToggleGroup>-->
+                    <com.google.android.material.button.MaterialButton
+                        android:id="@+id/fontStyleStrike"
+                        style="@style/Widget.MaterialComponents.Button.OutlinedButton"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:fontFamily="@font/community_material_font_v5_8_55"
+                        android:minWidth="48dp"
+                        android:textSize="20sp"
+                        app:iconPadding="0dp"
+                        tools:text="\uf6b1" />
+
+                    <com.google.android.material.button.MaterialButton
+                        android:id="@+id/fontStyleSubscript"
+                        style="@style/Widget.MaterialComponents.Button.OutlinedButton"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:fontFamily="@font/community_material_font_v5_8_55"
+                        android:minWidth="48dp"
+                        android:textSize="20sp"
+                        app:iconPadding="0dp"
+                        tools:text="\uf6b2" />
+
+                    <com.google.android.material.button.MaterialButton
+                        android:id="@+id/fontStyleSuperscript"
+                        style="@style/Widget.MaterialComponents.Button.OutlinedButton"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:fontFamily="@font/community_material_font_v5_8_55"
+                        android:minWidth="48dp"
+                        android:textSize="20sp"
+                        app:iconPadding="0dp"
+                        tools:text="\uf6b3" />
+                </com.google.android.material.button.MaterialButtonToggleGroup>
+
+                <!-- TODO 2021-10-05: stack the group and button on top -->
+                <!-- android:layout_marginTop="-13dp" -->
+                <com.google.android.material.button.MaterialButton
+                    android:id="@+id/fontStyleClear"
+                    style="@style/Widget.MaterialComponents.Button.OutlinedButton"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:layout_marginHorizontal="8dp"
+                    android:text="@string/messages_compose_style_clear" />
+            </LinearLayout>
 
             <Button
                 android:id="@+id/breakpoints"
+                style="@style/Widget.MaterialComponents.Button.OutlinedButton"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
-                style="@style/Widget.MaterialComponents.Button.OutlinedButton"
                 android:layout_marginHorizontal="8dp"
                 android:text="Breakpoints!"
-                android:visibility="gone"/>
+                android:visibility="gone"
-
+                tools:visibility="visible" />
 
+            <TextView
+                android:id="@+id/textHtml"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_margin="8dp"
+                android:fontFamily="monospace"
+                android:visibility="gone"
+                tools:text="&lt;p&gt;Witam,&lt;/p&gt;To jest bardzo długi tekst żeby sprawdzić ok działa"
+                tools:visibility="visible" />
         </LinearLayout>
     </ScrollView>
 </layout>

app/src/main/res/values/strings.xml

@@ -1464,4 +1464,11 @@
     <string name="contributors_subtext_format" translatable="false">\@%s - %s</string>
     <string name="contributors_headline">Najłatwiejszy sposób na korzystanie z e-dziennika.</string>
     <string name="dialog_lesson_attendance_details">Szczegóły</string>
+    <string name="hint_style_bold">Pogrubienie</string>
+    <string name="hint_style_italic">Pochylenie</string>
+    <string name="hint_style_underline">Podkreślenie</string>
+    <string name="hint_style_strike">Przekreślenie</string>
+    <string name="hint_style_subscript">Indeks dolny</string>
+    <string name="hint_style_superscript">Indeks górny</string>
+    <string name="messages_compose_style_clear">Wyczyść format</string>
 </resources>