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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
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