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

@@ -11,6 +11,8 @@ import com.wbrawner.simplemarkdown.utility.PreferenceHelper
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.withLock
@@ -31,6 +33,7 @@ data class EditorState(
      * a new file
      */
     val reloadToggle: Int = 0,
+    val lockSwiping: Boolean = false,
     private val initialMarkdown: String = "",
 ) {
     val dirty: Boolean
@@ -49,6 +52,11 @@ class MarkdownViewModel(
         viewModelScope.launch {
             load(null)
         }
+        preferenceHelper.observe<Boolean>(Preference.LOCK_SWIPING)
+            .onEach {
+                _state.value = _state.value.copy(lockSwiping = it)
+            }
+            .launchIn(viewModelScope)
     }
 
     fun updateMarkdown(markdown: String?) {
@@ -210,11 +218,19 @@ class MarkdownViewModel(
             return
         }
         _state.value =
-            EditorState(fileName = untitledFileName, reloadToggle = _state.value.reloadToggle.inv())
+            EditorState(
+                fileName = untitledFileName,
+                reloadToggle = _state.value.reloadToggle.inv(),
+                lockSwiping = preferenceHelper[Preference.LOCK_SWIPING] as Boolean
+            )
         Timber.i("Removing autosave uri from shared prefs")
         preferenceHelper[Preference.AUTOSAVE_URI] = null
     }
 
+    fun setLockSwiping(enabled: Boolean) {
+        preferenceHelper[Preference.LOCK_SWIPING] = enabled
+    }
+
     companion object {
         fun factory(
             fileHelper: FileHelper,

app/src/main/java/com/wbrawner/simplemarkdown/ui/MainScreen.kt

@@ -86,6 +86,7 @@ fun MainScreen(
     val dirty by viewModel.collectAsState(EditorState::dirty, false)
     val alert by viewModel.collectAsState(EditorState::alert, null)
     val saveCallback by viewModel.collectAsState(EditorState::saveCallback, null)
+    val lockSwiping by viewModel.collectAsState(EditorState::lockSwiping, false)
     LaunchedEffect(enableAutosave) {
         if (!enableAutosave) return@LaunchedEffect
         while (isActive) {
@@ -101,6 +102,8 @@ fun MainScreen(
         initialMarkdown = initialMarkdown,
         markdown = markdown,
         setMarkdown = viewModel::updateMarkdown,
+        lockSwiping = lockSwiping,
+        toggleLockSwiping = viewModel::setLockSwiping,
         message = toast?.stringRes(),
         dismissMessage = viewModel::dismissToast,
         alert = alert,
@@ -137,6 +140,8 @@ private fun MainScreen(
     initialMarkdown: String = "",
     markdown: String = "",
     setMarkdown: (String) -> Unit = {},
+    lockSwiping: Boolean,
+    toggleLockSwiping: (Boolean) -> Unit,
     message: String? = null,
     dismissMessage: () -> Unit = {},
     alert: AlertDialogModel? = null,
@@ -150,7 +155,6 @@ private fun MainScreen(
     enableWideLayout: Boolean = false,
     enableReadability: Boolean = false
 ) {
-    var lockSwiping by remember { mutableStateOf(true) }
     val openFileLauncher =
         rememberLauncherForActivityResult(ActivityResultContracts.OpenDocument()) {
             loadFile(it)
@@ -250,10 +254,11 @@ private fun MainScreen(
                                             Text(stringResource(R.string.action_lock_swipe))
                                             Checkbox(
                                                 checked = lockSwiping,
-                                                onCheckedChange = { lockSwiping = !lockSwiping })
+                                                onCheckedChange = toggleLockSwiping
+                                            )
                                         }
                                     }, onClick = {
-                                        lockSwiping = !lockSwiping
+                                        toggleLockSwiping(!lockSwiping)
                                         menuExpanded = false
                                     })
                                 }

app/src/main/java/com/wbrawner/simplemarkdown/utility/PreferenceHelper.kt

@@ -1,19 +1,14 @@
 package com.wbrawner.simplemarkdown.utility
 
 import android.content.Context
-import android.net.Uri
 import androidx.core.content.edit
 import androidx.preference.PreferenceManager
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.coroutineScope
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.launch
-import kotlinx.coroutines.withContext
-import timber.log.Timber
-import java.io.IOException
 
 interface PreferenceHelper {
     operator fun get(preference: Preference): Any?
@@ -25,15 +20,7 @@ interface PreferenceHelper {
 
 class AndroidPreferenceHelper(context: Context, private val coroutineScope: CoroutineScope = CoroutineScope(Dispatchers.IO)): PreferenceHelper {
     private val sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context)
-    private val states = mapOf(
+    private val states = Preference.entries.associateWith { MutableStateFlow(get(it)) }
-        Preference.ANALYTICS_ENABLED to MutableStateFlow(get(Preference.ANALYTICS_ENABLED)),
-        Preference.AUTOSAVE_ENABLED to MutableStateFlow(get(Preference.AUTOSAVE_ENABLED)),
-        Preference.AUTOSAVE_URI to MutableStateFlow(get(Preference.AUTOSAVE_URI)),
-        Preference.CUSTOM_CSS to MutableStateFlow(get(Preference.CUSTOM_CSS)),
-        Preference.DARK_MODE to MutableStateFlow(get(Preference.DARK_MODE)),
-        Preference.ERROR_REPORTS_ENABLED to MutableStateFlow(get(Preference.ERROR_REPORTS_ENABLED)),
-        Preference.READABILITY_ENABLED to MutableStateFlow(get(Preference.READABILITY_ENABLED)),
-    )
 
     override fun get(preference: Preference): Any? = sharedPreferences.all[preference.key]?: preference.default
 
@@ -63,5 +50,6 @@ enum class Preference(val key: String, val default: Any?) {
     CUSTOM_CSS("pref.custom_css", null),
     DARK_MODE("darkMode", "Auto"),
     ERROR_REPORTS_ENABLED("acra.enable", true),
+    LOCK_SWIPING("lockSwiping", false),
     READABILITY_ENABLED("readability.enable", false)
 }

app/src/test/java/com/wbrawner/simplemarkdown/FakePreferenceHelper.kt

@@ -2,17 +2,27 @@ package com.wbrawner.simplemarkdown
 
 import com.wbrawner.simplemarkdown.utility.Preference
 import com.wbrawner.simplemarkdown.utility.PreferenceHelper
+import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 
 class FakePreferenceHelper: PreferenceHelper {
     val preferences = mutableMapOf<Preference, Any?>()
-    override fun get(preference: Preference): Any? = preferences[preference]?: preference.default
+    private val preferenceFlows = mutableMapOf<Preference, MutableStateFlow<Any?>>()
+
+    private fun preferenceFlow(preference: Preference) = preferenceFlows.getOrPut(preference) {
+        MutableStateFlow(preference.default)
+    }
+
+    override fun get(preference: Preference): Any? =
+        (preferences[preference] ?: preference.default).also {
+            preferenceFlow(preference)
+        }
 
     override fun set(preference: Preference, value: Any?) {
+        preferenceFlow(preference).value = value
         preferences[preference] = value
     }
 
-    override fun <T> observe(preference: Preference): StateFlow<T> {
+    override fun <T> observe(preference: Preference): StateFlow<T> =
-        TODO("Not yet implemented")
+        preferenceFlow(preference) as StateFlow<T>
-    }
 }

app/src/test/java/com/wbrawner/simplemarkdown/MarkdownViewModelTest.kt

@@ -288,4 +288,18 @@ class MarkdownViewModelTest {
         viewModel.autosave()
         assertEquals(2, fileHelper.savedData.count())
     }
+
+    @Test
+    fun testSetLockSwiping() = runTest {
+        preferenceHelper[Preference.LOCK_SWIPING] = false
+        assertFalse(viewModel.state.value.lockSwiping)
+        viewModel.setLockSwiping(true)
+        viewModelScope.advanceUntilIdle()
+        assertTrue(preferenceHelper.preferences[Preference.LOCK_SWIPING] as Boolean)
+        assertTrue(viewModel.state.value.lockSwiping)
+        viewModel.setLockSwiping(false)
+        viewModelScope.advanceUntilIdle()
+        assertFalse(preferenceHelper.preferences[Preference.LOCK_SWIPING] as Boolean)
+        assertFalse(viewModel.state.value.lockSwiping)
+    }
 }