Add option to disable wallpaper scrolling (#2197)

Signed-off-by: Till Kottmann <me@deletescape.ch>

Co-authored-by: Till Kottmann <me@deletescape.ch>

lawnchair/res/values/strings.xml

@@ -108,5 +108,6 @@
     <string name="custom">Custom</string>
     <string name="custom_color">Custom Color</string>
     <string name="quickstep_description">Clear All Button, Corner Radius</string>
+    <string name="wallpaper_scrolling_label">Wallpaper scrolling</string>
     <string name="show_sys_ui_scrim">Show Top Shadow</string>
 </resources>

lawnchair/src/app/lawnchair/preferences/PreferenceManager.kt

@@ -88,6 +88,7 @@ class PreferenceManager private constructor(private val context: Context) : Base
     val autoLaunchRoot = BoolPref("pref_autoLaunchRoot", false)
     val useSystemAccent = BoolPref("pref_useSystemAccent", Utilities.ATLEAST_S, recreate)
     val accentColor = IntPref("pref_accentColor", LAWNCHAIR_BLUE.toInt(), recreate)
+    val wallpaperScrolling = BoolPref("pref_wallpaperScrolling", true)
     val showSysUiScrim = BoolPref("pref_showSysUiScrim", true)
 
     init {

lawnchair/src/app/lawnchair/ui/preferences/HomeScreenPreferences.kt

@@ -58,6 +58,10 @@ fun HomeScreenPreferences() {
                 prefs.smartSpaceEnable.getAdapter(),
                 label = stringResource(id = R.string.smart_space_enable),
             )
+            SwitchPreference(
+                prefs.wallpaperScrolling.getAdapter(),
+                label = stringResource(id = R.string.wallpaper_scrolling_label),
+            )
             SwitchPreference(
                 prefs.workspaceDt2s.getAdapter(),
                 label = stringResource(id = R.string.workspace_dt2s),

src/com/android/launcher3/util/WallpaperOffsetInterpolator.java

@@ -14,6 +14,8 @@ import android.os.SystemClock;
 import android.util.Log;
 import android.view.animation.Interpolator;
 
+import app.lawnchair.preferences.PreferenceManager;
+
 import com.android.launcher3.Utilities;
 import com.android.launcher3.Workspace;
 import com.android.launcher3.anim.Interpolators;
@@ -41,10 +43,13 @@ public class WallpaperOffsetInterpolator extends BroadcastReceiver {
     private boolean mLockedToDefaultPage;
     private int mNumScreens;
 
+    private PreferenceManager prefs;
+
     public WallpaperOffsetInterpolator(Workspace workspace) {
         mWorkspace = workspace;
         mIsRtl = Utilities.isRtl(workspace.getResources());
         mHandler = new OffsetHandler(workspace.getContext());
+        prefs = PreferenceManager.getInstance(workspace.getContext());
     }
 
     /**
@@ -68,7 +73,7 @@ public class WallpaperOffsetInterpolator extends BroadcastReceiver {
 
         // To match the default wallpaper behavior in the system, we default to either the left
         // or right edge on initialization
-        if (mLockedToDefaultPage || numScrollingPages <= 1) {
+        if (!prefs.getWallpaperScrolling().get() || mLockedToDefaultPage || numScrollingPages <= 1) {
             out[0] =  mIsRtl ? 1 : 0;
             return;
         }
@@ -273,4 +278,4 @@ public class WallpaperOffsetInterpolator extends BroadcastReceiver {
             }
         }
     }
-}
+}