Add Save as... and improve preview/edit performance

app/src/main/java/com/wbrawner/simplemarkdown/MarkdownApplication.kt

@@ -15,11 +15,11 @@ class MarkdownApplication : Application() {
                     .detectAll()
                     .penaltyDeath()
                     .build())
-//        StrictMode.setVmPolicy(StrictMode.VmPolicy.Builder()
+            StrictMode.setVmPolicy(StrictMode.VmPolicy.Builder()
-//                .detectAll()
+                    .detectAll()
-//                .penaltyLog()
+                    .penaltyLog()
-//                .penaltyDeath()
+                    .penaltyDeath()
-//                .build())
+                    .build())
         }
         super.onCreate()
     }

app/src/main/java/com/wbrawner/simplemarkdown/view/activity/MainActivity.kt

@@ -131,6 +131,9 @@ class MainActivity : AppCompatActivity(), ActivityCompat.OnRequestPermissionsRes
                     }
                 }
             }
+            R.id.action_save_as -> {
+                requestFileOp(REQUEST_SAVE_FILE)
+            }
             R.id.action_share -> {
                 val shareIntent = Intent(Intent.ACTION_SEND)
                 shareIntent.putExtra(Intent.EXTRA_TEXT, viewModel.markdownUpdates.value)

app/src/main/java/com/wbrawner/simplemarkdown/view/fragment/EditFragment.kt

@@ -35,6 +35,7 @@ class EditFragment : Fragment(), ViewPagerPage, CoroutineScope {
     private var markdownEditorScroller: ScrollView? = null
     private lateinit var viewModel: MarkdownViewModel
     override val coroutineContext: CoroutineContext = Dispatchers.Main
+    private var readabilityWatcher: TextWatcher? = null
 
     @SuppressLint("ClickableViewAccessibility")
     override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
@@ -71,56 +72,6 @@ class EditFragment : Fragment(), ViewPagerPage, CoroutineScope {
             }
 
         })
-        var enableReadability = false
-        launch {
-             enableReadability = withContext(Dispatchers.IO) {
-                 context?.let {
-                     PreferenceManager.getDefaultSharedPreferences(it)
-                             .getBoolean(getString(R.string.readability_enabled), false)
-                 }?: false
-             }
-        }
-        if (enableReadability) {
-            markdownEditor?.addTextChangedListener(object : TextWatcher {
-                private var previousValue = ""
-                private var searchFor = ""
-
-                override fun afterTextChanged(s: Editable?) {
-                    val searchText = s.toString().trim()
-                    if (searchText == searchFor)
-                        return
-
-                    searchFor = searchText
-
-                    launch {
-                        delay(250)
-                        if (searchText != searchFor)
-                            return@launch
-                        val start = System.currentTimeMillis()
-                        if (searchFor.isEmpty()) return@launch
-                        if (previousValue == searchFor) return@launch
-                        val readability = Readability(searchFor)
-                        val span = SpannableString(searchFor)
-                        for (sentence in readability.sentences()) {
-                            var color = Color.TRANSPARENT
-                            if (sentence.syllableCount() > 25) color = Color.argb(100, 229, 232, 42)
-                            if (sentence.syllableCount() > 35) color = Color.argb(100, 193, 66, 66)
-                            span.setSpan(BackgroundColorSpan(color), sentence.start(), sentence.end(), 0)
-                        }
-                        markdownEditor?.setTextKeepState(span, TextView.BufferType.SPANNABLE)
-                        previousValue = searchFor
-                        val timeTakenMs = System.currentTimeMillis() - start
-                        Log.d("SimpleMarkdown", "Handled markdown in " + timeTakenMs + "ms")
-                    }
-                }
-
-                override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
-                }
-
-                override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
-                }
-            })
-        }
 
         var touchDown = 0L
         var oldX = 0f
@@ -157,6 +108,30 @@ class EditFragment : Fragment(), ViewPagerPage, CoroutineScope {
         })
     }
 
+    override fun onStart() {
+        super.onStart()
+        launch {
+            val enableReadability = withContext(Dispatchers.IO) {
+                context?.let {
+                    PreferenceManager.getDefaultSharedPreferences(it)
+                            .getBoolean(getString(R.string.readability_enabled), false)
+                }?: false
+            }
+            if (enableReadability) {
+                if (readabilityWatcher == null) {
+                    readabilityWatcher = ReadabilityTextWatcher()
+                }
+                markdownEditor?.addTextChangedListener(readabilityWatcher)
+            } else {
+                readabilityWatcher?.let {
+                    markdownEditor?.removeTextChangedListener(it)
+                }
+                readabilityWatcher = null
+            }
+
+        }
+    }
+
     override fun onDestroy() {
         coroutineContext[Job]?.let {
             cancel()
@@ -171,4 +146,45 @@ class EditFragment : Fragment(), ViewPagerPage, CoroutineScope {
     override fun onDeselected() {
         markdownEditor?.hideKeyboard()
     }
+
+    inner class ReadabilityTextWatcher : TextWatcher {
+        private var previousValue = ""
+        private var searchFor = ""
+
+        override fun afterTextChanged(s: Editable?) {
+            val searchText = s.toString().trim()
+            if (searchText == searchFor)
+                return
+
+            searchFor = searchText
+
+            launch {
+                delay(250)
+                if (searchText != searchFor)
+                    return@launch
+                val start = System.currentTimeMillis()
+                if (searchFor.isEmpty()) return@launch
+                if (previousValue == searchFor) return@launch
+                val readability = Readability(searchFor)
+                val span = SpannableString(searchFor)
+                for (sentence in readability.sentences()) {
+                    var color = Color.TRANSPARENT
+                    if (sentence.syllableCount() > 25) color = Color.argb(100, 229, 232, 42)
+                    if (sentence.syllableCount() > 35) color = Color.argb(100, 193, 66, 66)
+                    Log.d("SimpleMarkdown", "Sentence start: ${sentence.start()} end: ${sentence.end()}")
+                    span.setSpan(BackgroundColorSpan(color), sentence.start(), sentence.end(), 0)
+                }
+                markdownEditor?.setTextKeepState(span, TextView.BufferType.SPANNABLE)
+                previousValue = searchFor
+                val timeTakenMs = System.currentTimeMillis() - start
+                Log.d("SimpleMarkdown", "Handled markdown in $timeTakenMs ms")
+            }
+        }
+
+        override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
+        }
+
+        override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
+        }
+    }
 }

app/src/main/java/com/wbrawner/simplemarkdown/view/fragment/PreviewFragment.kt

@@ -24,6 +24,7 @@ class PreviewFragment : Fragment(), CoroutineScope {
     override val coroutineContext: CoroutineContext = Dispatchers.Main
     lateinit var viewModel: MarkdownViewModel
     private var markdownPreview: WebView? = null
+    private var style: String = ""
 
     override fun onCreateView(
             inflater: LayoutInflater,
@@ -42,8 +43,7 @@ class PreviewFragment : Fragment(), CoroutineScope {
                 this,
                 (requireActivity().application as MarkdownApplication).viewModelFactory
         ).get(MarkdownViewModel::class.java)
-        viewModel.markdownUpdates.observe(this, Observer<String> {
+        launch {
-            markdownPreview?.post {
             val isNightMode = AppCompatDelegate.getDefaultNightMode() ==
                     AppCompatDelegate.MODE_NIGHT_YES
                     || context!!.resources.configuration.uiMode and UI_MODE_NIGHT_MASK == UI_MODE_NIGHT_YES
@@ -52,7 +52,6 @@ class PreviewFragment : Fragment(), CoroutineScope {
             } else {
                 R.string.pref_custom_css_default
             }
-                launch {
             val css = withContext(Dispatchers.IO) {
                 @Suppress("ConstantConditionIf")
                 if (!BuildConfig.ENABLE_CUSTOM_CSS) {
@@ -65,15 +64,24 @@ class PreviewFragment : Fragment(), CoroutineScope {
                             ) ?: ""
                 }
             }
-                    val style = String.format(FORMAT_CSS, css)
+            style = String.format(FORMAT_CSS, css)
+            updateWebContent(viewModel.markdownUpdates.value ?: "")
+            viewModel.markdownUpdates.observe(this@PreviewFragment, Observer<String> {
+                updateWebContent(it)
+            })
+        }
+    }
+
+    private fun updateWebContent(markdown: String) {
+        markdownPreview?.post {
+            launch {
                 markdownPreview?.loadDataWithBaseURL(null,
-                            style + it.toHtml(),
+                        style + markdown.toHtml(),
                         "text/html",
                         "UTF-8", null
                 )
             }
         }
-        })
     }
 
     override fun onDestroyView() {

app/src/main/res/menu/menu_edit.xml

@@ -17,6 +17,9 @@
     <item
         android:id="@+id/action_save"
         android:title="@string/action_save" />
+    <item
+        android:id="@+id/action_save_as"
+        android:title="@string/action_save_as" />
     <item
         android:id="@+id/action_lock_swipe"
         android:checkable="true"

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

@@ -64,6 +64,7 @@
     <string name="save_changes">Save Changes</string>
     <string name="prompt_save_changes">Would you like to save your changes?</string>
     <string name="action_discard">Discard</string>
+    <string name="action_save_as">Save as...</string>
     <string-array name="pref_entries_dark_mode">
         <item>@string/pref_value_light</item>
         <item>@string/pref_value_dark</item>