palemoon-dev/platform/accessible/html/HTMLImageMapAccessible.h

/* -*- 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_HTMLImageMapAccessible_h__
#define mozilla_a11y_HTMLImageMapAccessible_h__

#include "HTMLLinkAccessible.h"
#include "ImageAccessibleWrap.h"
#include "nsIDOMHTMLMapElement.h"

namespace mozilla {
namespace a11y {

/**
 * Used for HTML image maps.
 */
class HTMLImageMapAccessible final : public ImageAccessibleWrap
{
public:
  HTMLImageMapAccessible(nsIContent* aContent, DocAccessible* aDoc);

  // nsISupports and cycle collector
  NS_DECL_ISUPPORTS_INHERITED

  // Accessible
  virtual a11y::role NativeRole() override;

  // HyperLinkAccessible
  virtual uint32_t AnchorCount() override;
  virtual Accessible* AnchorAt(uint32_t aAnchorIndex) override;
  virtual already_AddRefed<nsIURI> AnchorURIAt(uint32_t aAnchorIndex) override;

  /**
   * Update area children of the image map.
   */
  void UpdateChildAreas(bool aDoFireEvents = true);

  /**
   * Return accessible of child node.
   */
  Accessible* GetChildAccessibleFor(const nsINode* aNode) const;

protected:
  virtual ~HTMLImageMapAccessible() { }
};

/**
 * Accessible for image map areas - must be child of image.
 */
class HTMLAreaAccessible final : public HTMLLinkAccessible
{
public:

  HTMLAreaAccessible(nsIContent* aContent, DocAccessible* aDoc);

  // Accessible
  virtual void Description(nsString& aDescription) override;
  virtual Accessible* ChildAtPoint(int32_t aX, int32_t aY,
                                   EWhichChildAtPoint aWhichChild) override;
  virtual nsRect RelativeBounds(nsIFrame** aBoundingFrame) const override;

  // HyperLinkAccessible
  virtual uint32_t StartOffset() override;
  virtual uint32_t EndOffset() override;

  virtual bool IsAcceptableChild(nsIContent* aEl) const override
    { return false; }

protected:
  // Accessible
  virtual ENameValueFlag NativeName(nsString& aName) override;
};


////////////////////////////////////////////////////////////////////////////////
// Accessible downcasting method

inline HTMLImageMapAccessible*
Accessible::AsImageMap()
{
  return IsImageMap() ? static_cast<HTMLImageMapAccessible*>(this) : nullptr;
}

} // namespace a11y
} // namespace mozilla

#endif