lets be smarter about displaying the Save button when autosave is off

app/src/main/kotlin/com/simplemobiletools/notes/activities/MainActivity.kt

@@ -43,6 +43,8 @@ class MainActivity : SimpleActivity(), ViewPager.OnPageChangeListener {
     private var noteViewWithTextSelected: MyEditText? = null
     private var wasInit = false
     private var storedUseEnglish = false
+    private var showSaveButton = false
+    private var saveNoteButton: MenuItem? = null
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -111,7 +113,9 @@ class MainActivity : SimpleActivity(), ViewPager.OnPageChangeListener {
             findItem(R.id.open_note).isVisible = shouldBeVisible
             findItem(R.id.delete_note).isVisible = shouldBeVisible
             findItem(R.id.export_all_notes).isVisible = shouldBeVisible
-            findItem(R.id.save_note).isVisible = !config.autosaveNotes
+
+            saveNoteButton = findItem(R.id.save_note)
+            saveNoteButton!!.isVisible = !config.autosaveNotes && showSaveButton
         }
 
         pager_title_strip.beVisibleIf(shouldBeVisible)
@@ -249,6 +253,7 @@ class MainActivity : SimpleActivity(), ViewPager.OnPageChangeListener {
     private fun addNewNote(note: Note) {
         val id = dbHelper.insertNote(note)
         mNotes = dbHelper.getNotes()
+        showSaveButton = false
         invalidateOptionsMenu()
         initViewPager()
         updateSelectedNote(id)
@@ -468,6 +473,8 @@ class MainActivity : SimpleActivity(), ViewPager.OnPageChangeListener {
 
     private fun saveNote() {
         saveCurrentNote()
+        showSaveButton = false
+        invalidateOptionsMenu()
     }
 
     private fun getNoteIndexWithId(id: Int): Int {
@@ -509,6 +516,13 @@ class MainActivity : SimpleActivity(), ViewPager.OnPageChangeListener {
         config.currentNoteId = mCurrentNote.id
     }
 
+    fun currentNoteTextChanged(newText: String) {
+        showSaveButton = newText != mCurrentNote.value
+        if (showSaveButton != saveNoteButton?.isVisible) {
+            invalidateOptionsMenu()
+        }
+    }
+
     private fun checkWhatsNewDialog() {
         arrayListOf<Release>().apply {
             add(Release(25, R.string.release_25))

app/src/main/kotlin/com/simplemobiletools/notes/fragments/NoteFragment.kt

@@ -50,11 +50,61 @@ class NoteFragment : Fragment() {
         return view
     }
 
+    override fun onResume() {
+        super.onResume()
+
+        val config = context!!.config
+        view.notes_view.apply {
+            typeface = if (config.monospacedFont) Typeface.MONOSPACE else Typeface.DEFAULT
+
+            val fileContents = context.getNoteStoredValue(note)
+
+            if (fileContents == null) {
+                (activity as MainActivity).deleteNote(false)
+                return
+            }
+
+            setColors(config.textColor, config.primaryColor, config.backgroundColor)
+            setTextSize(TypedValue.COMPLEX_UNIT_PX, context.getTextSize())
+            gravity = getTextGravity()
+            if (text.toString() != fileContents) {
+                setText(fileContents)
+                setSelection(if (config.placeCursorToEnd) text.length else 0)
+            }
+        }
+
+        if (config.showWordCount) {
+            view.notes_counter.beVisible()
+            view.notes_counter.setTextColor(config.textColor)
+            setWordCounter(view.notes_view.text.toString())
+        } else {
+            view.notes_counter.beGone()
+        }
+
+        if (config.showWordCount || !config.autosaveNotes) {
+            view.notes_view.addTextChangedListener(textWatcher)
+        } else {
+            view.notes_view.addTextChangedListener(null)
+        }
+    }
+
+    override fun onPause() {
+        super.onPause()
+        if (context!!.config.autosaveNotes) {
+            saveText()
+        }
+        view.notes_view.removeTextChangedListener(textWatcher)
+    }
+
     override fun setMenuVisibility(menuVisible: Boolean) {
         super.setMenuVisibility(menuVisible)
-        if (noteId != 0 && context?.config?.autosaveNotes == true) {
+        if (!menuVisible && noteId != 0 && context?.config?.autosaveNotes == true) {
             saveText()
         }
+
+        if (menuVisible && noteId != 0) {
+            (activity as MainActivity).currentNoteTextChanged(getCurrentNoteViewText())
+        }
     }
 
     fun getNotesView() = view.notes_view
@@ -98,50 +148,8 @@ class NoteFragment : Fragment() {
         else -> Gravity.LEFT
     }
 
-    override fun onResume() {
+    private fun setWordCounter(text: String) {
-        super.onResume()
+        val words = text.replace("\n", " ").split(" ")
-
-        val config = context!!.config
-
-        view.notes_view.apply {
-            typeface = if (config.monospacedFont) Typeface.MONOSPACE else Typeface.DEFAULT
-
-            val fileContents = context.getNoteStoredValue(note)
-
-            if (fileContents == null) {
-                (activity as MainActivity).deleteNote(false)
-                return
-            }
-
-            setColors(config.textColor, config.primaryColor, config.backgroundColor)
-            setTextSize(TypedValue.COMPLEX_UNIT_PX, context.getTextSize())
-            gravity = getTextGravity()
-            if (text.toString() != fileContents) {
-                setText(fileContents)
-                setSelection(if (config.placeCursorToEnd) text.length else 0)
-            }
-        }
-
-        if (config.showWordCount) {
-            view.notes_view.addTextChangedListener(textWatcher)
-            view.notes_counter.beVisible()
-            view.notes_counter.setTextColor(config.textColor)
-            setWordCounter(view.notes_view.text)
-        } else {
-            view.notes_counter.beGone()
-        }
-    }
-
-    override fun onPause() {
-        super.onPause()
-        if (context!!.config.autosaveNotes) {
-            saveText()
-        }
-        view.notes_view.removeTextChangedListener(textWatcher)
-    }
-
-    private fun setWordCounter(text: Editable) {
-        val words = text.toString().replace("\n", " ").split(" ")
         notes_counter.text = words.count { it.isNotEmpty() }.toString()
     }
 
@@ -153,7 +161,9 @@ class NoteFragment : Fragment() {
         }
 
         override fun afterTextChanged(editable: Editable) {
-            setWordCounter(editable)
+            val text = editable.toString()
+            setWordCounter(text)
+            (activity as MainActivity).currentNoteTextChanged(text)
         }
     }
 }