Fix widget page lag and add touch listener to grid layout

app/src/main/java/foundation/e/blisslauncher/core/customviews/LauncherPagedView.java

@@ -285,7 +285,7 @@ public class LauncherPagedView extends PagedView<PageIndicatorDots> implements V
     }
 
     public void bindAndInitFirstScreen(View view) {
-        // Do nothing here.
+
     }
 
     public void removeAllWorkspaceScreens() {

app/src/main/java/foundation/e/blisslauncher/features/test/CellLayout.kt

@@ -174,6 +174,10 @@ open class CellLayout @JvmOverloads constructor(
             })
             mDragOutlineAnims[i] = anim
         }
+
+        setOnClickListener {
+            launcher.getLauncherPagedView().setWobbleExpirationAlarm(0) // Stop wobbling immediately if empty space is touched.
+        }
     }
 
     override fun onMeasure(widthSpec: Int, heightSpec: Int) {

app/src/main/java/foundation/e/blisslauncher/features/widgets/WidgetsRootView.java

@@ -19,6 +19,10 @@ public class WidgetsRootView extends HorizontalScrollView {
 
     private boolean shouldScrollWorkspace = true;
 
+    // The following constants need to be scaled based on density. The scaled versions will be
+    // assigned to the corresponding member variables below.
+    private static final int FLING_THRESHOLD_VELOCITY = 500;
+
     public WidgetsRootView(Context context) {
         super(context);
         init();
@@ -55,6 +59,16 @@ public class WidgetsRootView extends HorizontalScrollView {
         }
     }
 
+    @Override
+    public void fling(int velocityX) {
+        super.fling(velocityX);
+        float density = getResources().getDisplayMetrics().density;
+        if (Math.abs(velocityX) > FLING_THRESHOLD_VELOCITY * density) {
+            shouldScrollWorkspace = !shouldScrollWorkspace;
+            overlay.onScrollInteractionEnd();
+        }
+    }
+
     @Override
     protected boolean overScrollBy(
         int deltaX,

app/src/quickstep/recents_ui_overrides/src/foundation/e/blisslauncher/uioverrides/OverlayCallbackImpl.java

@@ -15,6 +15,9 @@ public class OverlayCallbackImpl implements TestActivity.LauncherOverlay {
 
     private TestActivity.LauncherOverlayCallbacks mLauncherOverlayCallbacks;
 
+    // The page is moved more than halfway, automatically move to the next page on touch up.
+    private static final float SIGNIFICANT_MOVE_THRESHOLD = 0.4f;
+
     public OverlayCallbackImpl(TestActivity launcher) {
         this.mLauncher = launcher;
     }
@@ -27,10 +30,10 @@ public class OverlayCallbackImpl implements TestActivity.LauncherOverlay {
     @Override
     public void onScrollInteractionEnd() {
         if(scrollFromWorkspace) {
-            if(mProgress >= 0.5f) mLauncherOverlayCallbacks.onScrollEnd(1f, true);
+            if(mProgress >= SIGNIFICANT_MOVE_THRESHOLD) mLauncherOverlayCallbacks.onScrollEnd(1f, true);
             else mLauncherOverlayCallbacks.onScrollEnd(0f, true);
         } else {
-            if(mProgress < 0.5f) mLauncherOverlayCallbacks.onScrollEnd(0f, false);
+            if(mProgress < SIGNIFICANT_MOVE_THRESHOLD) mLauncherOverlayCallbacks.onScrollEnd(0f, false);
             else mLauncherOverlayCallbacks.onScrollEnd(1f, false);
         }
     }