Let launcher to provide its own OverscrollPlugin

If the local OverscrollPlugin provided by the activity is non-null and
FORCE_LOCAL_OVERSCROLL_PLUGIN is true, the local plugin object overrides
the loaded actual plugin.

Test: Manual testing flipping the flag and observing which plugin is
activated.
Bug: 150245271

Change-Id: I0cd5184628c2cb572b5e1c56d6a008dcaa8807fb

quickstep/recents_ui_overrides/src/com/android/quickstep/TaskOverlayFactory.java

@@ -31,6 +31,7 @@ import com.android.launcher3.util.MainThreadInitializedObject;
 import com.android.launcher3.util.ResourceBasedOverride;
 import com.android.quickstep.views.TaskThumbnailView;
 import com.android.quickstep.views.TaskView;
+import com.android.systemui.plugins.OverscrollPlugin;
 import com.android.systemui.shared.recents.model.Task;
 import com.android.systemui.shared.recents.model.ThumbnailData;
 
@@ -67,6 +68,13 @@ public class TaskOverlayFactory implements ResourceBasedOverride {
     public static final MainThreadInitializedObject<TaskOverlayFactory> INSTANCE =
             forOverride(TaskOverlayFactory.class, R.string.task_overlay_factory_class);
 
+    /**
+     * @return a launcher-provided OverscrollPlugin if available, otherwise null
+     */
+    public OverscrollPlugin getLocalOverscrollPlugin() {
+        return null;
+    }
+
     public TaskOverlay createOverlay(TaskThumbnailView thumbnailView) {
         return new TaskOverlay();
     }

quickstep/recents_ui_overrides/src/com/android/quickstep/TouchInteractionService.java

@@ -17,13 +17,7 @@ package com.android.quickstep;
 
 import static android.view.MotionEvent.ACTION_DOWN;
 
-import static com.android.launcher3.config.FeatureFlags.ADAPTIVE_ICON_WINDOW_ANIM;
-import static com.android.launcher3.config.FeatureFlags.APPLY_CONFIG_AT_RUNTIME;
-import static com.android.launcher3.config.FeatureFlags.ENABLE_HINTS_IN_OVERVIEW;
 import static com.android.launcher3.config.FeatureFlags.ENABLE_QUICKSTEP_LIVE_TILE;
-import static com.android.launcher3.config.FeatureFlags.FAKE_LANDSCAPE_UI;
-import static com.android.launcher3.config.FeatureFlags.QUICKSTEP_SPRINGS;
-import static com.android.launcher3.config.FeatureFlags.UNSTABLE_SPRINGS;
 import static com.android.launcher3.util.Executors.MAIN_EXECUTOR;
 import static com.android.launcher3.util.Executors.UI_HELPER_EXECUTOR;
 import static com.android.systemui.shared.system.QuickStepContract.KEY_EXTRA_INPUT_MONITOR;
@@ -507,12 +501,25 @@ public class TouchInteractionService extends Service implements PluginListener<O
                 base = new AssistantInputConsumer(this, newGestureState, base, mInputMonitorCompat);
             }
 
-            if (FeatureFlags.ENABLE_QUICK_CAPTURE_GESTURE.get()
-                    && (mOverscrollPlugin != null)
-                    && mOverscrollPlugin.isActive()) {
-                // Put the overscroll gesture as higher priority than the Assistant or base gestures
-                base = new OverscrollInputConsumer(this, newGestureState, base, mInputMonitorCompat,
-                        mOverscrollPlugin);
+            if (FeatureFlags.ENABLE_QUICK_CAPTURE_GESTURE.get()) {
+                OverscrollPlugin plugin = null;
+                if (FeatureFlags.FORCE_LOCAL_OVERSCROLL_PLUGIN.get()) {
+                    TaskOverlayFactory factory =
+                            TaskOverlayFactory.INSTANCE.get(getApplicationContext());
+                    plugin = factory.getLocalOverscrollPlugin();  // may be null
+                }
+
+                // If not local plugin was forced, use the actual overscroll plugin if available.
+                if (plugin == null && mOverscrollPlugin != null && mOverscrollPlugin.isActive()) {
+                    plugin = mOverscrollPlugin;
+                }
+
+                if (plugin != null) {
+                    // Put the overscroll gesture as higher priority than the Assistant or base
+                    // gestures
+                    base = new OverscrollInputConsumer(this, newGestureState, base,
+                        mInputMonitorCompat, plugin);
+                }
             }
 
             if (mDeviceState.isScreenPinningActive()) {

src/com/android/launcher3/config/FeatureFlags.java

@@ -106,6 +106,10 @@ public final class FeatureFlags {
     public static final BooleanFlag ENABLE_QUICK_CAPTURE_GESTURE = getDebugFlag(
             "ENABLE_QUICK_CAPTURE_GESTURE", true, "Swipe from right to left to quick capture");
 
+    public static final BooleanFlag FORCE_LOCAL_OVERSCROLL_PLUGIN = getDebugFlag(
+            "FORCE_LOCAL_OVERSCROLL_PLUGIN", false,
+            "Use a launcher-provided OverscrollPlugin if available");
+
     public static final BooleanFlag ASSISTANT_GIVES_LAUNCHER_FOCUS = getDebugFlag(
             "ASSISTANT_GIVES_LAUNCHER_FOCUS", false,
             "Allow Launcher to handle nav bar gestures while Assistant is running over it");