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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/. */
#include "HTMLImageMapAccessible.h"
#include "ARIAMap.h"
#include "EventTree.h"
#include "mozilla/a11y/Role.h"
#include "nsCoreUtils.h"
#include "nsIFrame.h"
#include "nsImageFrame.h"
#include "nsImageMap.h"
#include "nsLayoutUtils.h"
#include "mozilla/dom/HTMLAreaElement.h"
using namespace mozilla::a11y;
////////////////////////////////////////////////////////////////////////////////
// HTMLImageMapAccessible
////////////////////////////////////////////////////////////////////////////////
HTMLImageMapAccessible::HTMLImageMapAccessible(nsIContent* aContent,
DocAccessible* aDoc)
: ImageAccessible(aContent, aDoc) {
mType = eImageMapType;
UpdateChildAreas(false);
}
////////////////////////////////////////////////////////////////////////////////
// HTMLImageMapAccessible: LocalAccessible public
role HTMLImageMapAccessible::NativeRole() const { return roles::IMAGE_MAP; }
////////////////////////////////////////////////////////////////////////////////
// HTMLImageMapAccessible: public
void HTMLImageMapAccessible::UpdateChildAreas(bool aDoFireEvents) {
if (!mContent || !mContent->GetPrimaryFrame()) {
return;
}
nsImageFrame* imageFrame = do_QueryFrame(mContent->GetPrimaryFrame());
// If image map is not initialized yet then we trigger one time more later.
nsImageMap* imageMapObj = imageFrame->GetExistingImageMap();
if (!imageMapObj) return;
TreeMutation mt(this, TreeMutation::kNoEvents & !aDoFireEvents);
// Remove areas that are not a valid part of the image map anymore.
for (int32_t childIdx = mChildren.Length() - 1; childIdx >= 0; childIdx--) {
LocalAccessible* area = mChildren.ElementAt(childIdx);
if (area->GetContent()->GetPrimaryFrame()) continue;
mt.BeforeRemoval(area);
RemoveChild(area);
}
// Insert new areas into the tree.
uint32_t areaElmCount = imageMapObj->AreaCount();
for (uint32_t idx = 0; idx < areaElmCount; idx++) {
nsIContent* areaContent = imageMapObj->GetAreaAt(idx);
LocalAccessible* area = mChildren.SafeElementAt(idx);
if (!area || area->GetContent() != areaContent) {
RefPtr<LocalAccessible> area = new HTMLAreaAccessible(areaContent, mDoc);
mDoc->BindToDocument(area, aria::GetRoleMap(areaContent->AsElement()));
if (!InsertChildAt(idx, area)) {
mDoc->UnbindFromDocument(area);
break;
}
mt.AfterInsertion(area);
}
}
mt.Done();
}
LocalAccessible* HTMLImageMapAccessible::GetChildAccessibleFor(
const nsINode* aNode) const {
uint32_t length = mChildren.Length();
for (uint32_t i = 0; i < length; i++) {
LocalAccessible* area = mChildren[i];
if (area->GetContent() == aNode) return area;
}
return nullptr;
}
////////////////////////////////////////////////////////////////////////////////
// HTMLAreaAccessible
////////////////////////////////////////////////////////////////////////////////
HTMLAreaAccessible::HTMLAreaAccessible(nsIContent* aContent,
DocAccessible* aDoc)
: HTMLLinkAccessible(aContent, aDoc) {
// Make HTML area DOM element not accessible. HTML image map accessible
// manages its tree itself.
mStateFlags |= eNotNodeMapEntry;
}
////////////////////////////////////////////////////////////////////////////////
// HTMLAreaAccessible: LocalAccessible
role HTMLAreaAccessible::NativeRole() const {
// A link element without an href attribute and without a click listener
// should be reported as a generic.
if (mContent->IsElement()) {
dom::Element* element = mContent->AsElement();
if (!element->HasAttr(nsGkAtoms::href) &&
!nsCoreUtils::HasClickListener(element)) {
return roles::TEXT;
}
}
return HTMLLinkAccessible::NativeRole();
}
ENameValueFlag HTMLAreaAccessible::NativeName(nsString& aName) const {
ENameValueFlag nameFlag = LocalAccessible::NativeName(aName);
if (!aName.IsEmpty()) return nameFlag;
if (!mContent->AsElement()->GetAttr(nsGkAtoms::alt, aName)) {
Value(aName);
}
return eNameOK;
}
void HTMLAreaAccessible::Description(nsString& aDescription) const {
aDescription.Truncate();
// Still to do - follow IE's standard here
RefPtr<dom::HTMLAreaElement> area =
dom::HTMLAreaElement::FromNodeOrNull(mContent);
if (area) area->GetShape(aDescription);
}
////////////////////////////////////////////////////////////////////////////////
// HTMLAreaAccessible: LocalAccessible public
LocalAccessible* HTMLAreaAccessible::LocalChildAtPoint(
int32_t aX, int32_t aY, EWhichChildAtPoint aWhichChild) {
// Don't walk into area accessibles.
return this;
}
////////////////////////////////////////////////////////////////////////////////
// HTMLImageMapAccessible: HyperLinkAccessible
uint32_t HTMLAreaAccessible::StartOffset() {
// Image map accessible is not hypertext accessible therefore
// StartOffset/EndOffset implementations of LocalAccessible doesn't work here.
// We return index in parent because image map contains area links only which
// are embedded objects.
// XXX: image map should be a hypertext accessible.
return IndexInParent();
}
uint32_t HTMLAreaAccessible::EndOffset() { return IndexInParent() + 1; }
nsRect HTMLAreaAccessible::RelativeBounds(nsIFrame** aBoundingFrame) const {
nsIFrame* frame = GetFrame();
if (!frame) return nsRect();
nsImageFrame* imageFrame = do_QueryFrame(frame);
nsImageMap* map = imageFrame->GetImageMap();
nsRect bounds;
nsresult rv = map->GetBoundsForAreaContent(mContent, bounds);
if (NS_FAILED(rv)) return nsRect();
// XXX Areas are screwy; they return their rects as a pair of points, one pair
// stored into the width and height.
*aBoundingFrame = frame;
bounds.SizeTo(bounds.Width() - bounds.X(), bounds.Height() - bounds.Y());
return bounds;
}
nsRect HTMLAreaAccessible::ParentRelativeBounds() {
nsIFrame* boundingFrame = nullptr;
nsRect relativeBoundsRect = RelativeBounds(&boundingFrame);
if (MOZ_UNLIKELY(!boundingFrame)) {
// Area is not attached to an image map?
return nsRect();
}
// The relative bounds returned above are relative to this area's
// image map, which is technically already "parent relative".
// Because area elements are `display:none` to layout, they can't
// have transforms or other styling applied directly, and so we
// don't apply any additional transforms here. Any transform
// at the image map layer will be taken care of when computing bounds
// in the parent process.
return relativeBoundsRect;
}
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