1 files changed, 94 insertions, 0 deletions
diff --git a/accessible/generic/ImageAccessible.h b/accessible/generic/ImageAccessible.h
new file mode 100644
index 0000000000..1a072c5f90
--- /dev/null
+++ b/accessible/generic/ImageAccessible.h
@@ -0,0 +1,94 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#ifndef mozilla_a11y_ImageAccessible_h__
+#define mozilla_a11y_ImageAccessible_h__
+
+#include "BaseAccessibles.h"
+#include "imgINotificationObserver.h"
+
+namespace mozilla {
+namespace a11y {
+
+/* LocalAccessible for supporting images
+ * supports:
+ * - gets name, role
+ * - support basic state
+ */
+class ImageAccessible : public LinkableAccessible,
+                        public imgINotificationObserver {
+ public:
+  ImageAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_IMGINOTIFICATIONOBSERVER
+
+  // LocalAccessible
+  virtual void Shutdown() override;
+  virtual a11y::role NativeRole() const override;
+  virtual uint64_t NativeState() const override;
+  virtual already_AddRefed<AccAttributes> NativeAttributes() override;
+
+  // ActionAccessible
+  virtual uint8_t ActionCount() const override;
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+  virtual bool DoAction(uint8_t aIndex) const override;
+
+  // ImageAccessible
+  LayoutDeviceIntPoint Position(uint32_t aCoordType);
+  LayoutDeviceIntSize Size();
+
+  /**
+   * Return whether the element has a longdesc URI.
+   */
+  bool HasLongDesc() const {
+    nsCOMPtr<nsIURI> uri = GetLongDescURI();
+    return uri;
+  }
+
+ protected:
+  virtual ~ImageAccessible();
+
+  // LocalAccessible
+  virtual ENameValueFlag NativeName(nsString& aName) const override;
+
+  virtual void DOMAttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
+                                   int32_t aModType,
+                                   const nsAttrValue* aOldValue,
+                                   uint64_t aOldState) override;
+
+ private:
+  /**
+   * Return an URI for showlongdesc action if any.
+   */
+  already_AddRefed<nsIURI> GetLongDescURI() const;
+
+  /**
+   * Used by ActionNameAt and DoAction to ensure the index for opening the
+   * longdesc URL is valid.
+   * It is always assumed that the highest possible index opens the longdesc.
+   * This doesn't check that there is actually a longdesc, just that the index
+   * would be correct if there was one.
+   *
+   * @param aIndex  The 0-based index to be tested.
+   *
+   * @returns  true if index is valid for longdesc action.
+   */
+  inline bool IsLongDescIndex(uint8_t aIndex) const;
+
+  uint32_t mImageRequestStatus;
+};
+
+////////////////////////////////////////////////////////////////////////////////
+// LocalAccessible downcasting method
+
+inline ImageAccessible* LocalAccessible::AsImage() {
+  return IsImage() ? static_cast<ImageAccessible*>(this) : nullptr;
+}
+
+}  // namespace a11y
+}  // namespace mozilla
+
+#endif