Bug 1822004: On Android, use RemoteAccessible (CtW) hit testing instead of a DOM event. r=eeejay

This unifies hit testing across all platforms.
It also removes one of the few remaining uses of virtual cursor change events.

Differential Revision: https://phabricator.services.mozilla.com/D192641

accessible/android/AccessibleWrap.cpp

@@ -173,19 +173,29 @@ bool AccessibleWrap::PivotTo(int32_t aGranularity, bool aForward,
   return false;
 }
 
-void AccessibleWrap::ExploreByTouch(float aX, float aY) {
+Accessible* AccessibleWrap::ExploreByTouch(Accessible* aAccessible, float aX,
-  a11y::Pivot pivot(RootAccessible());
+                                           float aY) {
-  TraversalRule rule;
+  Accessible* root;
-
+  if (LocalAccessible* local = aAccessible->AsLocal()) {
-  Accessible* maybeResult = pivot.AtPoint(aX, aY, rule);
+    root = local->RootAccessible();
-  LocalAccessible* result = maybeResult ? maybeResult->AsLocal() : nullptr;
+  } else {
-
+    // If this is a RemoteAccessible, provide the top level
-  if (result && result != this) {
+    // remote doc as the pivot root for thread safety reasons.
-    RefPtr<AccEvent> event =
+    DocAccessibleParent* doc = aAccessible->AsRemote()->Document();
-        new AccVCChangeEvent(result->Document(), this, result,
+    while (doc && !doc->IsTopLevel()) {
-                             nsIAccessiblePivot::REASON_POINT, eFromUserInput);
+      doc = doc->ParentDoc();
-    nsEventShell::FireEvent(event);
+    }
+    MOZ_ASSERT(doc, "Failed to get top level DocAccessibleParent");
+    root = doc;
   }
+  a11y::Pivot pivot(root);
+  TraversalRule rule(java::SessionAccessibility::HTML_GRANULARITY_DEFAULT,
+                     aAccessible->IsLocal());
+  Accessible* result = pivot.AtPoint(aX, aY, rule);
+  if (result == aAccessible) {
+    return nullptr;
+  }
+  return result;
 }
 
 static TextLeafPoint ToTextLeafPoint(Accessible* aAccessible, int32_t aOffset) {

accessible/android/AccessibleWrap.h

@@ -30,7 +30,8 @@ class AccessibleWrap : public LocalAccessible {
   MOZ_CAN_RUN_SCRIPT_BOUNDARY
   virtual bool PivotTo(int32_t aGranularity, bool aForward, bool aInclusive);
 
-  void ExploreByTouch(float aX, float aY);
+  static Accessible* ExploreByTouch(Accessible* aAccessible, float aX,
+                                    float aY);
 
   static uint32_t GetFlags(role aRole, uint64_t aState, uint8_t aActionCount);
 

accessible/android/Platform.cpp

@@ -186,11 +186,7 @@ void a11y::PlatformVirtualCursorChangeEvent(Accessible* aTarget,
     return;
   }
 
-  if (aReason == nsIAccessiblePivot::REASON_POINT) {
+  sessionAcc->SendAccessibilityFocusedEvent(aNewPosition);
-    sessionAcc->SendHoverEnterEvent(aNewPosition);
-  } else {
-    sessionAcc->SendAccessibilityFocusedEvent(aNewPosition);
-  }
 }
 
 void a11y::PlatformScrollingEvent(Accessible* aTarget, uint32_t aEventType,

accessible/android/RootAccessibleWrap.cpp

@@ -1,69 +0,0 @@
-/* -*- Mode: c++; c-basic-offset: 2; tab-width: 20; indent-tabs-mode: nil; -*-
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "RootAccessibleWrap.h"
-
-#include "LocalAccessible-inl.h"
-
-#include "DocAccessibleParent.h"
-#include "DocAccessible-inl.h"
-#include "SessionAccessibility.h"
-#include "mozilla/PresShell.h"
-#include "mozilla/dom/EventTarget.h"
-#include "mozilla/dom/Event.h"
-#include "mozilla/dom/MouseEvent.h"
-
-using namespace mozilla;
-using namespace mozilla::a11y;
-using namespace mozilla::dom;
-
-RootAccessibleWrap::RootAccessibleWrap(dom::Document* aDoc,
-                                       PresShell* aPresShell)
-    : RootAccessible(aDoc, aPresShell) {}
-
-RootAccessibleWrap::~RootAccessibleWrap() {}
-
-nsresult RootAccessibleWrap::AddEventListeners() {
-  nsPIDOMWindowOuter* window = mDocumentNode->GetWindow();
-  nsCOMPtr<EventTarget> nstarget = window ? window->GetParentTarget() : nullptr;
-
-  if (nstarget) {
-    nstarget->AddEventListener(u"MozMouseExploreByTouch"_ns, this, false, true);
-  }
-
-  return RootAccessible::AddEventListeners();
-}
-
-nsresult RootAccessibleWrap::RemoveEventListeners() {
-  nsPIDOMWindowOuter* window = mDocumentNode->GetWindow();
-  nsCOMPtr<EventTarget> nstarget = window ? window->GetParentTarget() : nullptr;
-  if (nstarget) {
-    nstarget->RemoveEventListener(u"MozMouseExploreByTouch"_ns, this, true);
-  }
-
-  return RootAccessible::RemoveEventListeners();
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// nsIDOMEventListener
-
-NS_IMETHODIMP
-RootAccessibleWrap::HandleEvent(Event* aDOMEvent) {
-  WidgetMouseEvent* widgetEvent = aDOMEvent->WidgetEventPtr()->AsMouseEvent();
-  if (widgetEvent && widgetEvent->mMessage == eMouseExploreByTouch) {
-    if (HasShutdown()) {
-      return NS_OK;
-    }
-
-    if (MouseEvent* mouseEvent = aDOMEvent->AsMouseEvent()) {
-      LayoutDeviceIntPoint point = mouseEvent->ScreenPointLayoutDevicePix();
-      ExploreByTouch(point.x, point.y);
-    }
-
-    return NS_OK;
-  }
-
-  return RootAccessible::HandleEvent(aDOMEvent);
-}

accessible/android/RootAccessibleWrap.h

@@ -14,22 +14,7 @@ class PresShell;
 
 namespace a11y {
 
-/**
+using RootAccessibleWrap = RootAccessible;
- * Android specific functionality for the node at a root of the accessibility
- * tree: see the RootAccessible superclass for further details.
- */
-class RootAccessibleWrap : public RootAccessible {
- public:
-  RootAccessibleWrap(dom::Document* aDocument, PresShell* aPresShell);
-  virtual ~RootAccessibleWrap();
-
-  // nsIDOMEventListener
-  NS_DECL_NSIDOMEVENTLISTENER
-
- protected:
-  virtual nsresult AddEventListeners() override;
-  virtual nsresult RemoveEventListeners() override;
-};
 
 }  // namespace a11y
 }  // namespace mozilla

accessible/android/SessionAccessibility.cpp

@@ -12,8 +12,8 @@
 #include "nsThreadUtils.h"
 #include "AccAttributes.h"
 #include "AccessibilityEvent.h"
+#include "DocAccessibleWrap.h"
 #include "JavaBuiltins.h"
-#include "RootAccessibleWrap.h"
 #include "nsAccessibilityService.h"
 #include "nsAccUtils.h"
 #include "nsViewManager.h"
@@ -192,15 +192,30 @@ bool SessionAccessibility::Pivot(int32_t aID, int32_t aGranularity,
 }
 
 void SessionAccessibility::ExploreByTouch(int32_t aID, float aX, float aY) {
-  auto gvAccessor(mWindow.Access());
+  MOZ_ASSERT(AndroidBridge::IsJavaUiThread());
-  if (gvAccessor) {
+  MonitorAutoLock mal(nsAccessibilityService::GetAndroidMonitor());
-    if (nsWindow* gkWindow = gvAccessor->GetNsWindow()) {
+  RefPtr<SessionAccessibility> self(this);
-      WidgetMouseEvent hittest(true, eMouseExploreByTouch, gkWindow,
+  if (Accessible* origin = GetAccessibleByID(aID)) {
-                               WidgetMouseEvent::eReal);
+    if (origin->IsLocal()) {
-      hittest.mRefPoint = LayoutDeviceIntPoint::Floor(aX, aY);
+      nsAppShell::PostEvent([this, self, aID, aX, aY] {
-      hittest.mInputSource = dom::MouseEvent_Binding::MOZ_SOURCE_TOUCH;
+        MonitorAutoLock mal(nsAccessibilityService::GetAndroidMonitor());
-      hittest.mFlags.mOnlyChromeDispatch = true;
+        if (Accessible* origin = GetAccessibleByID(aID)) {
-      gkWindow->DispatchInputEvent(&hittest);
+          if (Accessible* result =
+                  AccessibleWrap::ExploreByTouch(origin, aX, aY)) {
+            SendHoverEnterEvent(result);
+          }
+        }
+      });
+    } else {
+      if (Accessible* result = AccessibleWrap::ExploreByTouch(origin, aX, aY)) {
+        int32_t resultID = AccessibleWrap::GetVirtualViewID(result);
+        nsAppShell::PostEvent([this, self, resultID] {
+          MonitorAutoLock mal(nsAccessibilityService::GetAndroidMonitor());
+          if (Accessible* result = GetAccessibleByID(resultID)) {
+            SendHoverEnterEvent(result);
+          }
+        });
+      }
     }
   }
 }

accessible/android/SessionAccessibility.h

@@ -11,17 +11,11 @@
 #include "nsAppShell.h"
 #include "nsThreadUtils.h"
 #include "nsWindow.h"
-#include "AccessibleWrap.h"
 
 namespace mozilla {
 namespace a11y {
 
-class AccessibleWrap;
-class AccAttributes;
 class Accessible;
-class RemoteAccessible;
-class RootAccessibleWrap;
-class BatchData;
 
 class SessionAccessibility final
     : public java::SessionAccessibility::NativeProvider::Natives<

accessible/android/moz.build

@@ -14,7 +14,6 @@ SOURCES += [
     "AccessibleWrap.cpp",
     "DocAccessibleWrap.cpp",
     "Platform.cpp",
-    "RootAccessibleWrap.cpp",
     "SessionAccessibility.cpp",
     "TraversalRule.cpp",
 ]

accessible/interfaces/nsIAccessiblePivot.idl

@@ -26,7 +26,6 @@ interface nsIAccessiblePivot : nsISupports
   const PivotMoveReason REASON_PREV = 2;
   const PivotMoveReason REASON_FIRST = 3;
   const PivotMoveReason REASON_LAST = 4;
-  const PivotMoveReason REASON_POINT = 5;
 
   /**
    * Move pivot to next object, from current position or given anchor,