Allow TouchControllers to override shouldDisableGestures

Currently only StatusBarTouchController overrides this to always return
false, so that you can swipe down for notifications during transition to
home screen from an app (in gesture nav).

Bug: 137161198
Change-Id: I803c37937d5294810cbe0c1bbffcd5dddcc5ca3b

quickstep/src/com/android/launcher3/uioverrides/touchcontrollers/StatusBarTouchController.java

@@ -166,4 +166,10 @@ public class StatusBarTouchController implements TouchController {
         mSysUiProxy = RecentsModel.INSTANCE.get(mLauncher).getSystemUiProxy();
         return mSysUiProxy != null;
     }
+
+    @Override
+    public boolean allowWhenGesturesDisabled() {
+        // Always allow intercepting touches for this controller.
+        return true;
+    }
 }

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

@@ -32,5 +32,9 @@ public interface TouchController {
      */
     boolean onControllerInterceptTouchEvent(MotionEvent ev);
 
+    default boolean allowWhenGesturesDisabled() {
+        return false;
+    }
+
     default void dump(String prefix, PrintWriter writer) { }
 }

src/com/android/launcher3/views/BaseDragLayer.java

@@ -21,7 +21,6 @@ import static android.view.MotionEvent.ACTION_DOWN;
 import static android.view.MotionEvent.ACTION_UP;
 
 import static com.android.launcher3.Utilities.SINGLE_FRAME_MS;
-import static com.android.launcher3.Utilities.shouldDisableGestures;
 
 import android.annotation.TargetApi;
 import android.content.Context;
@@ -30,7 +29,6 @@ import android.graphics.Rect;
 import android.graphics.RectF;
 import android.os.Build;
 import android.util.AttributeSet;
-import android.util.Log;
 import android.util.Property;
 import android.view.MotionEvent;
 import android.view.View;
@@ -152,15 +150,17 @@ public abstract class BaseDragLayer<T extends Context & ActivityContext>
     }
 
     private TouchController findControllerToHandleTouch(MotionEvent ev) {
-        if (shouldDisableGestures(ev)) return null;
+        boolean gesturesEnabled = !Utilities.shouldDisableGestures(ev);
 
         AbstractFloatingView topView = AbstractFloatingView.getTopOpenView(mActivity);
-        if (topView != null && topView.onControllerInterceptTouchEvent(ev)) {
+        if (topView != null && (gesturesEnabled || topView.allowWhenGesturesDisabled())
+                && topView.onControllerInterceptTouchEvent(ev)) {
             return topView;
         }
 
         for (TouchController controller : mControllers) {
-            if (controller.onControllerInterceptTouchEvent(ev)) {
+            if ((gesturesEnabled || controller.allowWhenGesturesDisabled())
+                    && controller.onControllerInterceptTouchEvent(ev)) {
                 return controller;
             }
         }