1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/accessible/src/generic/ImageAccessible.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,93 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#ifndef mozilla_a11y_ImageAccessible_h__
1.10 +#define mozilla_a11y_ImageAccessible_h__
1.11 +
1.12 +#include "BaseAccessibles.h"
1.13 +#include "nsIAccessibleImage.h"
1.14 +
1.15 +class nsGenericHTMLElement;
1.16 +
1.17 +namespace mozilla {
1.18 +namespace a11y {
1.19 +
1.20 +/* Accessible for supporting images
1.21 + * supports:
1.22 + * - gets name, role
1.23 + * - support basic state
1.24 + */
1.25 +class ImageAccessible : public LinkableAccessible,
1.26 + public nsIAccessibleImage
1.27 +{
1.28 +public:
1.29 + ImageAccessible(nsIContent* aContent, DocAccessible* aDoc);
1.30 +
1.31 + // nsISupports
1.32 + NS_DECL_ISUPPORTS_INHERITED
1.33 +
1.34 + // nsIAccessible
1.35 + NS_IMETHOD GetActionName(uint8_t aIndex, nsAString& aName);
1.36 + NS_IMETHOD DoAction(uint8_t index);
1.37 +
1.38 + // nsIAccessibleImage
1.39 + NS_DECL_NSIACCESSIBLEIMAGE
1.40 +
1.41 + // Accessible
1.42 + virtual a11y::role NativeRole();
1.43 + virtual uint64_t NativeState();
1.44 + virtual already_AddRefed<nsIPersistentProperties> NativeAttributes() MOZ_OVERRIDE;
1.45 +
1.46 + // ActionAccessible
1.47 + virtual uint8_t ActionCount();
1.48 +
1.49 +protected:
1.50 + // Accessible
1.51 + virtual ENameValueFlag NativeName(nsString& aName) MOZ_OVERRIDE;
1.52 +
1.53 +private:
1.54 + /**
1.55 + * Return whether the element has a longdesc URI.
1.56 + */
1.57 + bool HasLongDesc() const
1.58 + {
1.59 + nsCOMPtr<nsIURI> uri = GetLongDescURI();
1.60 + return uri;
1.61 + }
1.62 +
1.63 + /**
1.64 + * Return an URI for showlongdesc action if any.
1.65 + */
1.66 + already_AddRefed<nsIURI> GetLongDescURI() const;
1.67 +
1.68 + /**
1.69 + * Used by GetActionName and DoAction to ensure the index for opening the
1.70 + * longdesc URL is valid.
1.71 + * It is always assumed that the highest possible index opens the longdesc.
1.72 + * This doesn't check that there is actually a longdesc, just that the index
1.73 + * would be correct if there was one.
1.74 + *
1.75 + * @param aIndex The 0-based index to be tested.
1.76 + *
1.77 + * @returns true if index is valid for longdesc action.
1.78 + */
1.79 + inline bool IsLongDescIndex(uint8_t aIndex);
1.80 +
1.81 +};
1.82 +
1.83 +////////////////////////////////////////////////////////////////////////////////
1.84 +// Accessible downcasting method
1.85 +
1.86 +inline ImageAccessible*
1.87 +Accessible::AsImage()
1.88 +{
1.89 + return IsImage() ? static_cast<ImageAccessible*>(this) : nullptr;
1.90 +}
1.91 +
1.92 +} // namespace a11y
1.93 +} // namespace mozilla
1.94 +
1.95 +#endif
1.96 +
