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-rw-r--r--accessible/generic/ImageAccessible.h94
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+/* -*- 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