88 lines
2.2 KiB
C++
88 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_a11y_ImageAccessible_h__
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#define mozilla_a11y_ImageAccessible_h__
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#include "BaseAccessibles.h"
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namespace mozilla {
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namespace a11y {
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/* Accessible for supporting images
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* supports:
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* - gets name, role
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* - support basic state
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*/
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class ImageAccessible : public LinkableAccessible
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{
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public:
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ImageAccessible(nsIContent* aContent, DocAccessible* aDoc);
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// Accessible
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virtual a11y::role NativeRole() override;
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virtual uint64_t NativeState() override;
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virtual already_AddRefed<nsIPersistentProperties> NativeAttributes() override;
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// ActionAccessible
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virtual uint8_t ActionCount() override;
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virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
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virtual bool DoAction(uint8_t aIndex) override;
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// ImageAccessible
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nsIntPoint Position(uint32_t aCoordType);
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nsIntSize Size();
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protected:
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virtual ~ImageAccessible();
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// Accessible
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virtual ENameValueFlag NativeName(nsString& aName) override;
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private:
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/**
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* Return whether the element has a longdesc URI.
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*/
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bool HasLongDesc() const
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{
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nsCOMPtr<nsIURI> uri = GetLongDescURI();
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return uri;
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}
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/**
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* Return an URI for showlongdesc action if any.
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*/
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already_AddRefed<nsIURI> GetLongDescURI() const;
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/**
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* Used by ActionNameAt and DoAction to ensure the index for opening the
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* longdesc URL is valid.
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* It is always assumed that the highest possible index opens the longdesc.
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* This doesn't check that there is actually a longdesc, just that the index
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* would be correct if there was one.
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*
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* @param aIndex The 0-based index to be tested.
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*
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* @returns true if index is valid for longdesc action.
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*/
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inline bool IsLongDescIndex(uint8_t aIndex);
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};
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////////////////////////////////////////////////////////////////////////////////
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// Accessible downcasting method
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inline ImageAccessible*
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Accessible::AsImage()
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{
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return IsImage() ? static_cast<ImageAccessible*>(this) : nullptr;
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}
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} // namespace a11y
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} // namespace mozilla
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#endif
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