[DO NOT MERGE] Fix sometime couldn't trigger A11y button with 3-finger

We inject the down events from where we detect the 3-finger swipe
gesture. It may not trigger the A11y Button if the event is not inside
the system gesture detection area.

We inject the original down location to injection all down events.

Bug: 166187595
Test: manually test
Change-Id: I0c0f84047fc24e40724332d51d7e3dc414bd0186

2 files changed, 76 insertions, 1 deletions

diff --git a/services/accessibility/java/com/android/server/accessibility/gestures/EventDispatcher.java b/services/accessibility/java/com/android/server/accessibility/gestures/EventDispatcher.java
index 070626be9f80..c70dfcc93e49 100644
--- a/services/accessibility/java/com/android/server/accessibility/gestures/EventDispatcher.java
+++ b/services/accessibility/java/com/android/server/accessibility/gestures/EventDispatcher.java
@@ -256,6 +256,7 @@ class EventDispatcher {
                 return actionMasked;
         }
     }
+
     /**
      * Sends down events to the view hierarchy for all pointers which are not already being
      * delivered i.e. pointers that are not yet injected.
@@ -285,6 +286,74 @@ class EventDispatcher {
     }
 
     /**
+     * Sends down events to the view hierarchy for all pointers which are not already being
+     * delivered with original down location. i.e. pointers that are not yet injected.
+     *
+     * @param prototype The prototype from which to create the injected events.
+     * @param policyFlags The policy flags associated with the event.
+     */
+    void sendDownForAllNotInjectedPointersWithOriginalDown(MotionEvent prototype, int policyFlags) {
+        // Inject the injected pointers.
+        int pointerIdBits = 0;
+        final int pointerCount = prototype.getPointerCount();
+        final MotionEvent event = computeEventWithOriginalDown(prototype);
+        for (int i = 0; i < pointerCount; i++) {
+            final int pointerId = prototype.getPointerId(i);
+            // Do not send event for already delivered pointers.
+            if (!mState.isInjectedPointerDown(pointerId)) {
+                pointerIdBits |= (1 << pointerId);
+                final int action = computeInjectionAction(MotionEvent.ACTION_DOWN, i);
+                sendMotionEvent(
+                        event,
+                        action,
+                        mState.getLastReceivedEvent(),
+                        pointerIdBits,
+                        policyFlags);
+            }
+        }
+    }
+
+    private MotionEvent computeEventWithOriginalDown(MotionEvent prototype) {
+        final int pointerCount = prototype.getPointerCount();
+        if (pointerCount != mState.getReceivedPointerTracker().getReceivedPointerDownCount()) {
+            Slog.w(LOG_TAG, "The pointer count doesn't match the received count.");
+            return MotionEvent.obtain(prototype);
+        }
+        MotionEvent.PointerCoords[] coords = new MotionEvent.PointerCoords[pointerCount];
+        MotionEvent.PointerProperties[] properties =
+                new MotionEvent.PointerProperties[pointerCount];
+        for (int i = 0; i < pointerCount; ++i) {
+            final int pointerId = prototype.getPointerId(i);
+            final float x = mState.getReceivedPointerTracker().getReceivedPointerDownX(pointerId);
+            final float y = mState.getReceivedPointerTracker().getReceivedPointerDownY(pointerId);
+            coords[i] = new MotionEvent.PointerCoords();
+            coords[i].x = x;
+            coords[i].y = y;
+            properties[i] = new MotionEvent.PointerProperties();
+            properties[i].id = pointerId;
+            properties[i].toolType = MotionEvent.TOOL_TYPE_FINGER;
+        }
+        MotionEvent event =
+                MotionEvent.obtain(
+                        prototype.getDownTime(),
+                        prototype.getEventTime(),
+                        prototype.getAction(),
+                        pointerCount,
+                        properties,
+                        coords,
+                        prototype.getMetaState(),
+                        prototype.getButtonState(),
+                        prototype.getXPrecision(),
+                        prototype.getYPrecision(),
+                        prototype.getDeviceId(),
+                        prototype.getEdgeFlags(),
+                        prototype.getSource(),
+                        prototype.getFlags());
+        return event;
+    }
+
+    /**
+     *
      * Sends up events to the view hierarchy for all pointers which are already being delivered i.e.
      * pointers that are injected.
      *
diff --git a/services/accessibility/java/com/android/server/accessibility/gestures/TouchExplorer.java b/services/accessibility/java/com/android/server/accessibility/gestures/TouchExplorer.java
index abde43076c4e..2b1e872420bc 100644
--- a/services/accessibility/java/com/android/server/accessibility/gestures/TouchExplorer.java
+++ b/services/accessibility/java/com/android/server/accessibility/gestures/TouchExplorer.java
@@ -629,7 +629,13 @@ public class TouchExplorer extends BaseEventStreamTransformation
                                     Slog.d(LOG_TAG, "Three-finger edge swipe detected.");
                                 }
                                 mState.startDelegating();
-                                mDispatcher.sendDownForAllNotInjectedPointers(event, policyFlags);
+                                if (mState.isTouchExploring()) {
+                                    mDispatcher.sendDownForAllNotInjectedPointers(event,
+                                            policyFlags);
+                                } else {
+                                    mDispatcher.sendDownForAllNotInjectedPointersWithOriginalDown(
+                                            event, policyFlags);
+                                }
                             }
                         }
                     }