Add an preference to disable the blur effect on Android 12+

ui/src/main/java/de/mm20/launcher2/ui/launcher/LauncherScaffoldVM.kt

@@ -2,6 +2,7 @@ package de.mm20.launcher2.ui.launcher
 
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
+import androidx.lifecycle.asLiveData
 import androidx.lifecycle.viewModelScope
 import de.mm20.launcher2.preferences.LauncherDataStore
 import kotlinx.coroutines.flow.first
@@ -47,4 +48,6 @@ class LauncherScaffoldVM : ViewModel(), KoinComponent {
         isSearchOpen.value = false
         isWidgetEditMode.value = editMode
     }
+
+    val wallpaperBlur = dataStore.data.map { it.appearance.blurWallpaper }.asLiveData()
 }

ui/src/main/java/de/mm20/launcher2/ui/launcher/PagerScaffold.kt

@@ -126,11 +126,14 @@ fun PagerScaffold(
         }
     }
 
+    val blurEnabled by viewModel.wallpaperBlur.observeAsState(false)
+
     val blurWallpaper by remember {
         derivedStateOf {
-            isSearchOpen || swipeableState.progress.to == Page.Widgets && swipeableState.progress.fraction <= 0.5f ||
-                    swipeableState.progress.to == Page.Search && swipeableState.progress.fraction > 0.5f ||
-                    !isWidgetsScrollZero
+            blurEnabled && (
+                    isSearchOpen || swipeableState.progress.to == Page.Widgets && swipeableState.progress.fraction <= 0.5f ||
+                            swipeableState.progress.to == Page.Search && swipeableState.progress.fraction > 0.5f ||
+                            !isWidgetsScrollZero)
         }
     }
 

ui/src/main/java/de/mm20/launcher2/ui/launcher/PullDownScaffold.kt

@@ -131,9 +131,11 @@ fun PullDownScaffold(
 
     val maxSearchBarOffset = with(density) { 128.dp.toPx() }
 
+    val blurEnabled by viewModel.wallpaperBlur.observeAsState(false)
+
     val blurWallpaper by remember {
         derivedStateOf {
-            isSearchOpen || offsetY.value > toggleSearchThreshold || widgetsScrollState.value > 0
+            blurEnabled && (isSearchOpen || offsetY.value > toggleSearchThreshold || widgetsScrollState.value > 0)
         }
     }
 

ui/src/main/java/de/mm20/launcher2/ui/settings/appearance/AppearanceSettingsScreen.kt

@@ -2,7 +2,6 @@ package de.mm20.launcher2.ui.settings.appearance
 
 import android.graphics.drawable.ColorDrawable
 import androidx.appcompat.app.AppCompatActivity
-import androidx.compose.foundation.ExperimentalFoundationApi
 import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.*
 import androidx.compose.foundation.lazy.grid.GridCells
@@ -28,9 +27,9 @@ import com.google.accompanist.pager.ExperimentalPagerApi
 import com.google.accompanist.pager.HorizontalPager
 import com.google.accompanist.pager.HorizontalPagerIndicator
 import com.google.accompanist.pager.rememberPagerState
-import de.mm20.launcher2.icons.ColorLayer
 import de.mm20.launcher2.icons.StaticIconLayer
 import de.mm20.launcher2.icons.StaticLauncherIcon
+import de.mm20.launcher2.ktx.isAtLeastApiLevel
 import de.mm20.launcher2.preferences.Settings.*
 import de.mm20.launcher2.preferences.Settings.AppearanceSettings.ColorScheme
 import de.mm20.launcher2.preferences.Settings.AppearanceSettings.Theme
@@ -155,6 +154,22 @@ fun AppearanceSettingsScreen() {
                         viewModel.setDimWallpaper(it)
                     }
                 )
+                if (isAtLeastApiLevel(31)) {
+                    val isBlurSupported = remember { viewModel.isBlurAvailable(context) }
+                    val blurWallpaper by viewModel.blurWallpaper.observeAsState()
+                    SwitchPreference(
+                        title = stringResource(R.string.preference_blur_wallpaper),
+                        summary = stringResource(
+                            if (isBlurSupported) R.string.preference_blur_wallpaper_summary
+                            else R.string.preference_blur_wallpaper_unsupported
+                        ),
+                        value = blurWallpaper == true && isBlurSupported,
+                        onValueChanged = {
+                            viewModel.setBlurWallpaper(it)
+                        },
+                        enabled = isBlurSupported
+                    )
+                }
             }
             PreferenceCategory(stringResource(R.string.preference_category_icons)) {
                 val iconShape by viewModel.iconShape.observeAsState(IconSettings.IconShape.PlatformDefault)

ui/src/main/java/de/mm20/launcher2/ui/settings/appearance/AppearanceSettingsScreenVM.kt

@@ -1,10 +1,14 @@
 package de.mm20.launcher2.ui.settings.appearance
 
+import android.content.Context
 import android.content.Intent
+import android.view.WindowManager
 import androidx.appcompat.app.AppCompatActivity
+import androidx.core.content.getSystemService
 import androidx.lifecycle.*
 import de.mm20.launcher2.icons.IconPack
 import de.mm20.launcher2.icons.IconRepository
+import de.mm20.launcher2.ktx.isAtLeastApiLevel
 import de.mm20.launcher2.preferences.LauncherDataStore
 import de.mm20.launcher2.preferences.Settings
 import de.mm20.launcher2.preferences.Settings.AppearanceSettings.*
@@ -85,6 +89,22 @@ class AppearanceSettingsScreenVM : ViewModel(), KoinComponent {
         }
     }
 
+    fun isBlurAvailable(context: Context): Boolean {
+        if (!isAtLeastApiLevel(31)) return false
+        return context.getSystemService<WindowManager>()?.isCrossWindowBlurEnabled == true
+    }
+
+    val blurWallpaper = dataStore.data.map { it.appearance.blurWallpaper }.asLiveData()
+    fun setBlurWallpaper(blurWallpaper: Boolean) {
+        viewModelScope.launch {
+            dataStore.updateData {
+                it.toBuilder()
+                    .setAppearance(it.appearance.toBuilder().setBlurWallpaper(blurWallpaper))
+                    .build()
+            }
+        }
+    }
+
     fun openWallpaperChooser(context: AppCompatActivity) {
         context.startActivity(Intent.createChooser(Intent(Intent.ACTION_SET_WALLPAPER), null))
     }