1 files changed, 186 insertions, 0 deletions
diff --git a/accessible/atk/nsMaiInterfaceComponent.cpp b/accessible/atk/nsMaiInterfaceComponent.cpp
new file mode 100644
index 0000000000..81e82a8f53
--- /dev/null
+++ b/accessible/atk/nsMaiInterfaceComponent.cpp
@@ -0,0 +1,186 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* 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 "InterfaceInitFuncs.h"
+
+#include "LocalAccessible-inl.h"
+#include "AccessibleWrap.h"
+#include "nsAccUtils.h"
+#include "nsMai.h"
+#include "nsWindow.h"
+#include "mozilla/Likely.h"
+#include "mozilla/a11y/DocAccessibleParent.h"
+#include "mozilla/a11y/RemoteAccessible.h"
+#include "mozilla/dom/BrowserParent.h"
+#include "mozilla/dom/Document.h"
+#include "nsAccessibilityService.h"
+
+using namespace mozilla;
+using namespace mozilla::a11y;
+
+extern "C" {
+
+static AtkObject* refAccessibleAtPointCB(AtkComponent* aComponent, gint aAccX,
+                                         gint aAccY, AtkCoordType aCoordType) {
+  return refAccessibleAtPointHelper(ATK_OBJECT(aComponent), aAccX, aAccY,
+                                    aCoordType);
+}
+
+static void getExtentsCB(AtkComponent* aComponent, gint* aX, gint* aY,
+                         gint* aWidth, gint* aHeight, AtkCoordType aCoordType) {
+  getExtentsHelper(ATK_OBJECT(aComponent), aX, aY, aWidth, aHeight, aCoordType);
+}
+
+static gboolean grabFocusCB(AtkComponent* aComponent) {
+  AtkObject* atkObject = ATK_OBJECT(aComponent);
+  Accessible* acc = GetInternalObj(atkObject);
+  if (acc) {
+    acc->TakeFocus();
+    return TRUE;
+  }
+  return FALSE;
+}
+
+// ScrollType is compatible
+MOZ_CAN_RUN_SCRIPT_BOUNDARY
+static gboolean scrollToCB(AtkComponent* aComponent, AtkScrollType type) {
+  AtkObject* atkObject = ATK_OBJECT(aComponent);
+  if (Accessible* acc = GetInternalObj(atkObject)) {
+    acc->ScrollTo(type);
+    return TRUE;
+  }
+
+  return FALSE;
+}
+
+// CoordType is compatible
+static gboolean scrollToPointCB(AtkComponent* aComponent, AtkCoordType coords,
+                                gint x, gint y) {
+  AtkObject* atkObject = ATK_OBJECT(aComponent);
+  AccessibleWrap* accWrap = GetAccessibleWrap(atkObject);
+  if (accWrap) {
+    accWrap->ScrollToPoint(coords, x, y);
+    return TRUE;
+  }
+
+  RemoteAccessible* proxy = GetProxy(atkObject);
+  if (proxy) {
+    proxy->ScrollToPoint(coords, x, y);
+    return TRUE;
+  }
+
+  return FALSE;
+}
+}
+
+AtkObject* refAccessibleAtPointHelper(AtkObject* aAtkObj, gint aX, gint aY,
+                                      AtkCoordType aCoordType) {
+  Accessible* acc = GetInternalObj(aAtkObj);
+  if (!acc) {
+    return nullptr;
+  }
+
+  // Accessible::ChildAtPoint(x,y) is in screen pixels.
+  if (aCoordType == ATK_XY_WINDOW) {
+    mozilla::LayoutDeviceIntPoint winCoords =
+        nsAccUtils::GetScreenCoordsForWindow(acc);
+    aX += winCoords.x;
+    aY += winCoords.y;
+  }
+
+  Accessible* accAtPoint =
+      acc->ChildAtPoint(aX, aY, Accessible::EWhichChildAtPoint::DeepestChild);
+  if (!accAtPoint) {
+    return nullptr;
+  }
+  roles::Role role = accAtPoint->Role();
+  if (role == roles::TEXT_LEAF || role == roles::STATICTEXT) {
+    // We don't include text leaf nodes in the ATK tree, so return the parent.
+    accAtPoint = accAtPoint->Parent();
+    MOZ_ASSERT(accAtPoint, "Text leaf should always have a parent");
+  }
+  AtkObject* atkObj = GetWrapperFor(accAtPoint);
+  if (atkObj) {
+    g_object_ref(atkObj);
+  }
+  return atkObj;
+}
+
+static double getScaleFactor(Accessible* aAccessible) {
+  DocAccessible* docAcc = nullptr;
+  if (LocalAccessible* localAcc = aAccessible->AsLocal()) {
+    docAcc = localAcc->Document();
+  } else {
+    RemoteAccessible* remote = aAccessible->AsRemote();
+    LocalAccessible* outerDoc = remote->OuterDocOfRemoteBrowser();
+    if (outerDoc) {
+      docAcc = outerDoc->Document();
+    }
+  }
+
+  if (!docAcc || !docAcc->DocumentNode()) {
+    return 1.0;
+  }
+
+  nsCOMPtr<nsIWidget> rootWidget =
+      nsContentUtils::WidgetForDocument(docAcc->DocumentNode());
+  if (!rootWidget) {
+    return 1.0;
+  }
+
+  if (RefPtr<nsWindow> window =
+          static_cast<nsWindow*>(rootWidget->GetTopLevelWidget())) {
+    return window->FractionalScaleFactor();
+  }
+
+  return 1.0;
+}
+
+void getExtentsHelper(AtkObject* aAtkObj, gint* aX, gint* aY, gint* aWidth,
+                      gint* aHeight, AtkCoordType aCoordType) {
+  *aX = *aY = *aWidth = *aHeight = -1;
+
+  Accessible* acc = GetInternalObj(aAtkObj);
+  if (!acc) {
+    return;
+  }
+
+  mozilla::LayoutDeviceIntRect screenRect = acc->Bounds();
+  if (screenRect.IsEmpty()) {
+    return;
+  }
+
+  if (aCoordType == ATK_XY_WINDOW) {
+    mozilla::LayoutDeviceIntPoint winCoords =
+        nsAccUtils::GetScreenCoordsForWindow(acc);
+    screenRect.x -= winCoords.x;
+    screenRect.y -= winCoords.y;
+  }
+
+  double scaleFactor = getScaleFactor(acc);
+
+  *aX = screenRect.x / scaleFactor;
+  *aY = screenRect.y / scaleFactor;
+  *aWidth = screenRect.width / scaleFactor;
+  *aHeight = screenRect.height / scaleFactor;
+}
+
+void componentInterfaceInitCB(AtkComponentIface* aIface) {
+  NS_ASSERTION(aIface, "Invalid Interface");
+  if (MOZ_UNLIKELY(!aIface)) return;
+
+  /*
+   * Use default implementation in atk for contains, get_position,
+   * and get_size
+   */
+  aIface->ref_accessible_at_point = refAccessibleAtPointCB;
+  aIface->get_extents = getExtentsCB;
+  aIface->grab_focus = grabFocusCB;
+  if (IsAtkVersionAtLeast(2, 30)) {
+    aIface->scroll_to = scrollToCB;
+    aIface->scroll_to_point = scrollToPointCB;
+  }
+}