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gecko-dev/layout/generic/nsImageMap.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
/* code for HTML client-side image maps */
#include "nsImageMap.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/Event.h" // for Event
#include "mozilla/dom/HTMLAreaElement.h"
#include "mozilla/gfx/PathHelpers.h"
#include "mozilla/UniquePtr.h"
#include "nsString.h"
#include "nsReadableUtils.h"
#include "nsPresContext.h"
#include "nsNameSpaceManager.h"
#include "nsGkAtoms.h"
#include "nsImageFrame.h"
#include "nsCoord.h"
#include "nsIContentInlines.h"
#include "nsIScriptError.h"
#include "nsIStringBundle.h"
#include "nsContentUtils.h"
#include "ImageLayers.h"
#ifdef ACCESSIBILITY
# include "nsAccessibilityService.h"
#endif
using namespace mozilla;
using namespace mozilla::gfx;
using namespace mozilla::dom;
class Area {
public:
explicit Area(HTMLAreaElement* aArea);
virtual ~Area();
virtual void ParseCoords(const nsAString& aSpec);
virtual bool IsInside(nscoord x, nscoord y) const = 0;
virtual void Draw(nsIFrame* aFrame, DrawTarget& aDrawTarget,
const ColorPattern& aColor,
const StrokeOptions& aStrokeOptions) = 0;
virtual void GetRect(nsIFrame* aFrame, nsRect& aRect) = 0;
void HasFocus(bool aHasFocus);
RefPtr<HTMLAreaElement> mArea;
UniquePtr<nscoord[]> mCoords;
int32_t mNumCoords;
bool mHasFocus;
};
Area::Area(HTMLAreaElement* aArea) : mArea(aArea) {
MOZ_COUNT_CTOR(Area);
MOZ_ASSERT(mArea, "How did that happen?");
mNumCoords = 0;
mHasFocus = false;
}
Area::~Area() { MOZ_COUNT_DTOR(Area); }
#include <stdlib.h>
inline bool is_space(char c) {
return (c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' ||
c == '\v');
}
static void logMessage(nsIContent* aContent, const nsAString& aCoordsSpec,
int32_t aFlags, const char* aMessageName) {
nsContentUtils::ReportToConsole(
aFlags, NS_LITERAL_CSTRING("Layout: ImageMap"), aContent->OwnerDoc(),
nsContentUtils::eLAYOUT_PROPERTIES, aMessageName, nullptr, /* params */
0, /* params length */
nullptr,
PromiseFlatString(NS_LITERAL_STRING("coords=\"") + aCoordsSpec +
NS_LITERAL_STRING("\""))); /* source line */
}
void Area::ParseCoords(const nsAString& aSpec) {
char* cp = ToNewUTF8String(aSpec);
if (cp) {
char* tptr;
char* n_str;
int32_t i, cnt;
/*
* Nothing in an empty list
*/
mNumCoords = 0;
mCoords = nullptr;
if (*cp == '\0') {
free(cp);
return;
}
/*
* Skip beginning whitespace, all whitespace is empty list.
*/
n_str = cp;
while (is_space(*n_str)) {
n_str++;
}
if (*n_str == '\0') {
free(cp);
return;
}
/*
* Make a pass where any two numbers separated by just whitespace
* are given a comma separator. Count entries while passing.
*/
cnt = 0;
while (*n_str != '\0') {
bool has_comma;
/*
* Skip to a separator
*/
tptr = n_str;
while (!is_space(*tptr) && *tptr != ',' && *tptr != '\0') {
tptr++;
}
n_str = tptr;
/*
* If no more entries, break out here
*/
if (*n_str == '\0') {
break;
}
/*
* Skip to the end of the separator, noting if we have a
* comma.
*/
has_comma = false;
while (is_space(*tptr) || *tptr == ',') {
if (*tptr == ',') {
if (!has_comma) {
has_comma = true;
} else {
break;
}
}
tptr++;
}
/*
* If this was trailing whitespace we skipped, we are done.
*/
if ((*tptr == '\0') && !has_comma) {
break;
}
/*
* Else if the separator is all whitespace, and this is not the
* end of the string, add a comma to the separator.
*/
else if (!has_comma) {
*n_str = ',';
}
/*
* count the entry skipped.
*/
cnt++;
n_str = tptr;
}
/*
* count the last entry in the list.
*/
cnt++;
/*
* Allocate space for the coordinate array.
*/
UniquePtr<nscoord[]> value_list = MakeUnique<nscoord[]>(cnt);
if (!value_list) {
free(cp);
return;
}
/*
* Second pass to copy integer values into list.
*/
tptr = cp;
for (i = 0; i < cnt; i++) {
char* ptr;
ptr = strchr(tptr, ',');
if (ptr) {
*ptr = '\0';
}
/*
* Strip whitespace in front of number because I don't
* trust atoi to do it on all platforms.
*/
while (is_space(*tptr)) {
tptr++;
}
if (*tptr == '\0') {
value_list[i] = 0;
} else {
value_list[i] = (nscoord)::atoi(tptr);
}
if (ptr) {
*ptr = ',';
tptr = ptr + 1;
}
}
mNumCoords = cnt;
mCoords = std::move(value_list);
free(cp);
}
}
void Area::HasFocus(bool aHasFocus) { mHasFocus = aHasFocus; }
//----------------------------------------------------------------------
class DefaultArea final : public Area {
public:
explicit DefaultArea(HTMLAreaElement* aArea);
virtual bool IsInside(nscoord x, nscoord y) const override;
virtual void Draw(nsIFrame* aFrame, DrawTarget& aDrawTarget,
const ColorPattern& aColor,
const StrokeOptions& aStrokeOptions) override;
virtual void GetRect(nsIFrame* aFrame, nsRect& aRect) override;
};
DefaultArea::DefaultArea(HTMLAreaElement* aArea) : Area(aArea) {}
bool DefaultArea::IsInside(nscoord x, nscoord y) const { return true; }
void DefaultArea::Draw(nsIFrame* aFrame, DrawTarget& aDrawTarget,
const ColorPattern& aColor,
const StrokeOptions& aStrokeOptions) {
if (mHasFocus) {
nsRect r(nsPoint(0, 0), aFrame->GetSize());
const nscoord kOnePixel = nsPresContext::CSSPixelsToAppUnits(1);
r.width -= kOnePixel;
r.height -= kOnePixel;
Rect rect = ToRect(nsLayoutUtils::RectToGfxRect(
r, aFrame->PresContext()->AppUnitsPerDevPixel()));
StrokeSnappedEdgesOfRect(rect, aDrawTarget, aColor, aStrokeOptions);
}
}
void DefaultArea::GetRect(nsIFrame* aFrame, nsRect& aRect) {
aRect = aFrame->GetRect();
aRect.MoveTo(0, 0);
}
//----------------------------------------------------------------------
class RectArea final : public Area {
public:
explicit RectArea(HTMLAreaElement* aArea);
virtual void ParseCoords(const nsAString& aSpec) override;
virtual bool IsInside(nscoord x, nscoord y) const override;
virtual void Draw(nsIFrame* aFrame, DrawTarget& aDrawTarget,
const ColorPattern& aColor,
const StrokeOptions& aStrokeOptions) override;
virtual void GetRect(nsIFrame* aFrame, nsRect& aRect) override;
};
RectArea::RectArea(HTMLAreaElement* aArea) : Area(aArea) {}
void RectArea::ParseCoords(const nsAString& aSpec) {
Area::ParseCoords(aSpec);
bool saneRect = true;
int32_t flag = nsIScriptError::warningFlag;
if (mNumCoords >= 4) {
if (mCoords[0] > mCoords[2]) {
// x-coords in reversed order
nscoord x = mCoords[2];
mCoords[2] = mCoords[0];
mCoords[0] = x;
saneRect = false;
}
if (mCoords[1] > mCoords[3]) {
// y-coords in reversed order
nscoord y = mCoords[3];
mCoords[3] = mCoords[1];
mCoords[1] = y;
saneRect = false;
}
if (mNumCoords > 4) {
// Someone missed the concept of a rect here
saneRect = false;
}
} else {
saneRect = false;
flag = nsIScriptError::errorFlag;
}
if (!saneRect) {
logMessage(mArea, aSpec, flag, "ImageMapRectBoundsError");
}
}
bool RectArea::IsInside(nscoord x, nscoord y) const {
if (mNumCoords >= 4) { // Note: > is for nav compatibility
nscoord x1 = mCoords[0];
nscoord y1 = mCoords[1];
nscoord x2 = mCoords[2];
nscoord y2 = mCoords[3];
NS_ASSERTION(x1 <= x2 && y1 <= y2,
"Someone screwed up RectArea::ParseCoords");
if ((x >= x1) && (x <= x2) && (y >= y1) && (y <= y2)) {
return true;
}
}
return false;
}
void RectArea::Draw(nsIFrame* aFrame, DrawTarget& aDrawTarget,
const ColorPattern& aColor,
const StrokeOptions& aStrokeOptions) {
if (mHasFocus) {
if (mNumCoords >= 4) {
nscoord x1 = nsPresContext::CSSPixelsToAppUnits(mCoords[0]);
nscoord y1 = nsPresContext::CSSPixelsToAppUnits(mCoords[1]);
nscoord x2 = nsPresContext::CSSPixelsToAppUnits(mCoords[2]);
nscoord y2 = nsPresContext::CSSPixelsToAppUnits(mCoords[3]);
NS_ASSERTION(x1 <= x2 && y1 <= y2,
"Someone screwed up RectArea::ParseCoords");
nsRect r(x1, y1, x2 - x1, y2 - y1);
Rect rect = ToRect(nsLayoutUtils::RectToGfxRect(
r, aFrame->PresContext()->AppUnitsPerDevPixel()));
StrokeSnappedEdgesOfRect(rect, aDrawTarget, aColor, aStrokeOptions);
}
}
}
void RectArea::GetRect(nsIFrame* aFrame, nsRect& aRect) {
if (mNumCoords >= 4) {
nscoord x1 = nsPresContext::CSSPixelsToAppUnits(mCoords[0]);
nscoord y1 = nsPresContext::CSSPixelsToAppUnits(mCoords[1]);
nscoord x2 = nsPresContext::CSSPixelsToAppUnits(mCoords[2]);
nscoord y2 = nsPresContext::CSSPixelsToAppUnits(mCoords[3]);
NS_ASSERTION(x1 <= x2 && y1 <= y2,
"Someone screwed up RectArea::ParseCoords");
aRect.SetRect(x1, y1, x2, y2);
}
}
//----------------------------------------------------------------------
class PolyArea final : public Area {
public:
explicit PolyArea(HTMLAreaElement* aArea);
virtual void ParseCoords(const nsAString& aSpec) override;
virtual bool IsInside(nscoord x, nscoord y) const override;
virtual void Draw(nsIFrame* aFrame, DrawTarget& aDrawTarget,
const ColorPattern& aColor,
const StrokeOptions& aStrokeOptions) override;
virtual void GetRect(nsIFrame* aFrame, nsRect& aRect) override;
};
PolyArea::PolyArea(HTMLAreaElement* aArea) : Area(aArea) {}
void PolyArea::ParseCoords(const nsAString& aSpec) {
Area::ParseCoords(aSpec);
if (mNumCoords >= 2) {
if (mNumCoords & 1U) {
logMessage(mArea, aSpec, nsIScriptError::warningFlag,
"ImageMapPolyOddNumberOfCoords");
}
} else {
logMessage(mArea, aSpec, nsIScriptError::errorFlag,
"ImageMapPolyWrongNumberOfCoords");
}
}
bool PolyArea::IsInside(nscoord x, nscoord y) const {
if (mNumCoords >= 6) {
int32_t intersects = 0;
nscoord wherex = x;
nscoord wherey = y;
int32_t totalv = mNumCoords / 2;
int32_t totalc = totalv * 2;
nscoord xval = mCoords[totalc - 2];
nscoord yval = mCoords[totalc - 1];
int32_t end = totalc;
int32_t pointer = 1;
if ((yval >= wherey) != (mCoords[pointer] >= wherey)) {
if ((xval >= wherex) == (mCoords[0] >= wherex)) {
intersects += (xval >= wherex) ? 1 : 0;
} else {
intersects += ((xval - (yval - wherey) * (mCoords[0] - xval) /
(mCoords[pointer] - yval)) >= wherex)
? 1
: 0;
}
}
// XXX I wonder what this is doing; this is a translation of ptinpoly.c
while (pointer < end) {
yval = mCoords[pointer];
pointer += 2;
if (yval >= wherey) {
while ((pointer < end) && (mCoords[pointer] >= wherey)) pointer += 2;
if (pointer >= end) break;
if ((mCoords[pointer - 3] >= wherex) ==
(mCoords[pointer - 1] >= wherex)) {
intersects += (mCoords[pointer - 3] >= wherex) ? 1 : 0;
} else {
intersects +=
((mCoords[pointer - 3] -
(mCoords[pointer - 2] - wherey) *
(mCoords[pointer - 1] - mCoords[pointer - 3]) /
(mCoords[pointer] - mCoords[pointer - 2])) >= wherex)
? 1
: 0;
}
} else {
while ((pointer < end) && (mCoords[pointer] < wherey)) pointer += 2;
if (pointer >= end) break;
if ((mCoords[pointer - 3] >= wherex) ==
(mCoords[pointer - 1] >= wherex)) {
intersects += (mCoords[pointer - 3] >= wherex) ? 1 : 0;
} else {
intersects +=
((mCoords[pointer - 3] -
(mCoords[pointer - 2] - wherey) *
(mCoords[pointer - 1] - mCoords[pointer - 3]) /
(mCoords[pointer] - mCoords[pointer - 2])) >= wherex)
? 1
: 0;
}
}
}
if ((intersects & 1) != 0) {
return true;
}
}
return false;
}
void PolyArea::Draw(nsIFrame* aFrame, DrawTarget& aDrawTarget,
const ColorPattern& aColor,
const StrokeOptions& aStrokeOptions) {
if (mHasFocus) {
if (mNumCoords >= 6) {
// Where possible, we want all horizontal and vertical lines to align on
// pixel rows or columns, and to start at pixel boundaries so that one
// pixel dashing neatly sits on pixels to give us neat lines. To achieve
// that we draw each line segment as a separate path, snapping it to
// device pixels if applicable.
nsPresContext* pc = aFrame->PresContext();
Point p1(pc->CSSPixelsToDevPixels(mCoords[0]),
pc->CSSPixelsToDevPixels(mCoords[1]));
Point p2, p1snapped, p2snapped;
for (int32_t i = 2; i < mNumCoords; i += 2) {
p2.x = pc->CSSPixelsToDevPixels(mCoords[i]);
p2.y = pc->CSSPixelsToDevPixels(mCoords[i + 1]);
p1snapped = p1;
p2snapped = p2;
SnapLineToDevicePixelsForStroking(p1snapped, p2snapped, aDrawTarget,
aStrokeOptions.mLineWidth);
aDrawTarget.StrokeLine(p1snapped, p2snapped, aColor, aStrokeOptions);
p1 = p2;
}
p2.x = pc->CSSPixelsToDevPixels(mCoords[0]);
p2.y = pc->CSSPixelsToDevPixels(mCoords[1]);
p1snapped = p1;
p2snapped = p2;
SnapLineToDevicePixelsForStroking(p1snapped, p2snapped, aDrawTarget,
aStrokeOptions.mLineWidth);
aDrawTarget.StrokeLine(p1snapped, p2snapped, aColor, aStrokeOptions);
}
}
}
void PolyArea::GetRect(nsIFrame* aFrame, nsRect& aRect) {
if (mNumCoords >= 6) {
nscoord x1, x2, y1, y2, xtmp, ytmp;
x1 = x2 = nsPresContext::CSSPixelsToAppUnits(mCoords[0]);
y1 = y2 = nsPresContext::CSSPixelsToAppUnits(mCoords[1]);
for (int32_t i = 2; i < mNumCoords; i += 2) {
xtmp = nsPresContext::CSSPixelsToAppUnits(mCoords[i]);
ytmp = nsPresContext::CSSPixelsToAppUnits(mCoords[i + 1]);
x1 = x1 < xtmp ? x1 : xtmp;
y1 = y1 < ytmp ? y1 : ytmp;
x2 = x2 > xtmp ? x2 : xtmp;
y2 = y2 > ytmp ? y2 : ytmp;
}
aRect.SetRect(x1, y1, x2, y2);
}
}
//----------------------------------------------------------------------
class CircleArea final : public Area {
public:
explicit CircleArea(HTMLAreaElement* aArea);
virtual void ParseCoords(const nsAString& aSpec) override;
virtual bool IsInside(nscoord x, nscoord y) const override;
virtual void Draw(nsIFrame* aFrame, DrawTarget& aDrawTarget,
const ColorPattern& aColor,
const StrokeOptions& aStrokeOptions) override;
virtual void GetRect(nsIFrame* aFrame, nsRect& aRect) override;
};
CircleArea::CircleArea(HTMLAreaElement* aArea) : Area(aArea) {}
void CircleArea::ParseCoords(const nsAString& aSpec) {
Area::ParseCoords(aSpec);
bool wrongNumberOfCoords = false;
int32_t flag = nsIScriptError::warningFlag;
if (mNumCoords >= 3) {
if (mCoords[2] < 0) {
logMessage(mArea, aSpec, nsIScriptError::errorFlag,
"ImageMapCircleNegativeRadius");
}
if (mNumCoords > 3) {
wrongNumberOfCoords = true;
}
} else {
wrongNumberOfCoords = true;
flag = nsIScriptError::errorFlag;
}
if (wrongNumberOfCoords) {
logMessage(mArea, aSpec, flag, "ImageMapCircleWrongNumberOfCoords");
}
}
bool CircleArea::IsInside(nscoord x, nscoord y) const {
// Note: > is for nav compatibility
if (mNumCoords >= 3) {
nscoord x1 = mCoords[0];
nscoord y1 = mCoords[1];
nscoord radius = mCoords[2];
if (radius < 0) {
return false;
}
nscoord dx = x1 - x;
nscoord dy = y1 - y;
nscoord dist = (dx * dx) + (dy * dy);
if (dist <= (radius * radius)) {
return true;
}
}
return false;
}
void CircleArea::Draw(nsIFrame* aFrame, DrawTarget& aDrawTarget,
const ColorPattern& aColor,
const StrokeOptions& aStrokeOptions) {
if (mHasFocus) {
if (mNumCoords >= 3) {
Point center(aFrame->PresContext()->CSSPixelsToDevPixels(mCoords[0]),
aFrame->PresContext()->CSSPixelsToDevPixels(mCoords[1]));
Float diameter =
2 * aFrame->PresContext()->CSSPixelsToDevPixels(mCoords[2]);
if (diameter <= 0) {
return;
}
RefPtr<PathBuilder> builder = aDrawTarget.CreatePathBuilder();
AppendEllipseToPath(builder, center, Size(diameter, diameter));
RefPtr<Path> circle = builder->Finish();
aDrawTarget.Stroke(circle, aColor, aStrokeOptions);
}
}
}
void CircleArea::GetRect(nsIFrame* aFrame, nsRect& aRect) {
if (mNumCoords >= 3) {
nscoord x1 = nsPresContext::CSSPixelsToAppUnits(mCoords[0]);
nscoord y1 = nsPresContext::CSSPixelsToAppUnits(mCoords[1]);
nscoord radius = nsPresContext::CSSPixelsToAppUnits(mCoords[2]);
if (radius < 0) {
return;
}
aRect.SetRect(x1 - radius, y1 - radius, x1 + radius, y1 + radius);
}
}
//----------------------------------------------------------------------
nsImageMap::nsImageMap() : mImageFrame(nullptr), mConsiderWholeSubtree(false) {}
nsImageMap::~nsImageMap() {
NS_ASSERTION(mAreas.Length() == 0, "Destroy was not called");
}
NS_IMPL_ISUPPORTS(nsImageMap, nsIMutationObserver, nsIDOMEventListener)
nsresult nsImageMap::GetBoundsForAreaContent(nsIContent* aContent,
nsRect& aBounds) {
NS_ENSURE_TRUE(aContent && mImageFrame, NS_ERROR_INVALID_ARG);
// Find the Area struct associated with this content node, and return bounds
for (auto& area : mAreas) {
if (area->mArea == aContent) {
aBounds = nsRect();
area->GetRect(mImageFrame, aBounds);
return NS_OK;
}
}
return NS_ERROR_FAILURE;
}
void nsImageMap::AreaRemoved(HTMLAreaElement* aArea) {
if (aArea->IsInUncomposedDoc()) {
NS_ASSERTION(aArea->GetPrimaryFrame() == mImageFrame,
"Unexpected primary frame");
aArea->SetPrimaryFrame(nullptr);
}
aArea->RemoveSystemEventListener(NS_LITERAL_STRING("focus"), this, false);
aArea->RemoveSystemEventListener(NS_LITERAL_STRING("blur"), this, false);
}
void nsImageMap::FreeAreas() {
for (UniquePtr<Area>& area : mAreas) {
AreaRemoved(area->mArea);
}
mAreas.Clear();
}
void nsImageMap::Init(nsImageFrame* aImageFrame, nsIContent* aMap) {
MOZ_ASSERT(aMap);
MOZ_ASSERT(aImageFrame);
mImageFrame = aImageFrame;
mMap = aMap;
mMap->AddMutationObserver(this);
// "Compile" the areas in the map into faster access versions
UpdateAreas();
}
void nsImageMap::SearchForAreas(nsIContent* aParent) {
// Look for <area> elements.
for (nsIContent* child = aParent->GetFirstChild(); child;
child = child->GetNextSibling()) {
if (auto* area = HTMLAreaElement::FromNode(child)) {
AddArea(area);
// Continue to next child. This stops mConsiderWholeSubtree from
// getting set. It also makes us ignore children of <area>s which
// is consistent with how we react to dynamic insertion of such
// children.
continue;
}
if (child->IsElement()) {
mConsiderWholeSubtree = true;
SearchForAreas(child);
}
}
}
void nsImageMap::UpdateAreas() {
// Get rid of old area data
FreeAreas();
mConsiderWholeSubtree = false;
SearchForAreas(mMap);
#ifdef ACCESSIBILITY
if (nsAccessibilityService* accService = GetAccService()) {
accService->UpdateImageMap(mImageFrame);
}
#endif
}
void nsImageMap::AddArea(HTMLAreaElement* aArea) {
static Element::AttrValuesArray strings[] = {
nsGkAtoms::rect, nsGkAtoms::rectangle,
nsGkAtoms::circle, nsGkAtoms::circ,
nsGkAtoms::_default, nsGkAtoms::poly,
nsGkAtoms::polygon, nullptr};
UniquePtr<Area> area;
switch (aArea->FindAttrValueIn(kNameSpaceID_None, nsGkAtoms::shape, strings,
eIgnoreCase)) {
case Element::ATTR_VALUE_NO_MATCH:
case Element::ATTR_MISSING:
case 0:
case 1:
area = MakeUnique<RectArea>(aArea);
break;
case 2:
case 3:
area = MakeUnique<CircleArea>(aArea);
break;
case 4:
area = MakeUnique<DefaultArea>(aArea);
break;
case 5:
case 6:
area = MakeUnique<PolyArea>(aArea);
break;
default:
area = nullptr;
MOZ_ASSERT_UNREACHABLE("FindAttrValueIn returned an unexpected value.");
break;
}
// Add focus listener to track area focus changes
aArea->AddSystemEventListener(NS_LITERAL_STRING("focus"), this, false, false);
aArea->AddSystemEventListener(NS_LITERAL_STRING("blur"), this, false, false);
// This is a nasty hack. It needs to go away: see bug 135040. Once this is
// removed, the code added to RestyleManager::RestyleElement,
// nsCSSFrameConstructor::ContentRemoved (both hacks there), and
// RestyleManager::ProcessRestyledFrames to work around this issue can
// be removed.
aArea->SetPrimaryFrame(mImageFrame);
nsAutoString coords;
aArea->GetAttr(kNameSpaceID_None, nsGkAtoms::coords, coords);
area->ParseCoords(coords);
mAreas.AppendElement(std::move(area));
}
nsIContent* nsImageMap::GetArea(nscoord aX, nscoord aY) const {
NS_ASSERTION(mMap, "Not initialized");
for (const auto& area : mAreas) {
if (area->IsInside(aX, aY)) {
return area->mArea;
}
}
return nullptr;
}
nsIContent* nsImageMap::GetAreaAt(uint32_t aIndex) const {
return mAreas.ElementAt(aIndex)->mArea;
}
void nsImageMap::Draw(nsIFrame* aFrame, DrawTarget& aDrawTarget,
const ColorPattern& aColor,
const StrokeOptions& aStrokeOptions) {
for (auto& area : mAreas) {
area->Draw(aFrame, aDrawTarget, aColor, aStrokeOptions);
}
}
void nsImageMap::MaybeUpdateAreas(nsIContent* aContent) {
if (aContent == mMap || mConsiderWholeSubtree) {
UpdateAreas();
}
}
void nsImageMap::AttributeChanged(dom::Element* aElement, int32_t aNameSpaceID,
nsAtom* aAttribute, int32_t aModType,
const nsAttrValue* aOldValue) {
// If the parent of the changing content node is our map then update
// the map. But only do this if the node is an HTML <area> or <a>
// and the attribute that's changing is "shape" or "coords" -- those
// are the only cases we care about.
if ((aElement->NodeInfo()->Equals(nsGkAtoms::area) ||
aElement->NodeInfo()->Equals(nsGkAtoms::a)) &&
aElement->IsHTMLElement() && aNameSpaceID == kNameSpaceID_None &&
(aAttribute == nsGkAtoms::shape || aAttribute == nsGkAtoms::coords)) {
MaybeUpdateAreas(aElement->GetParent());
} else if (aElement == mMap && aNameSpaceID == kNameSpaceID_None &&
(aAttribute == nsGkAtoms::name || aAttribute == nsGkAtoms::id) &&
mImageFrame) {
// ID or name has changed. Let ImageFrame recreate ImageMap.
mImageFrame->DisconnectMap();
}
}
void nsImageMap::ContentAppended(nsIContent* aFirstNewContent) {
MaybeUpdateAreas(aFirstNewContent->GetParent());
}
void nsImageMap::ContentInserted(nsIContent* aChild) {
MaybeUpdateAreas(aChild->GetParent());
}
static UniquePtr<Area> TakeArea(nsImageMap::AreaList& aAreas,
HTMLAreaElement* aArea) {
UniquePtr<Area> result;
size_t index = 0;
for (UniquePtr<Area>& area : aAreas) {
if (area->mArea == aArea) {
result = std::move(area);
break;
}
index++;
}
if (result) {
aAreas.RemoveElementAt(index);
}
return result;
}
void nsImageMap::ContentRemoved(nsIContent* aChild,
nsIContent* aPreviousSibling) {
if (aChild->GetParent() != mMap && !mConsiderWholeSubtree) {
return;
}
auto* areaElement = HTMLAreaElement::FromNode(aChild);
if (!areaElement) {
return;
}
UniquePtr<Area> area = TakeArea(mAreas, areaElement);
if (!area) {
return;
}
AreaRemoved(area->mArea);
#ifdef ACCESSIBILITY
if (nsAccessibilityService* accService = GetAccService()) {
accService->UpdateImageMap(mImageFrame);
}
#endif
}
void nsImageMap::ParentChainChanged(nsIContent* aContent) {
NS_ASSERTION(aContent == mMap, "Unexpected ParentChainChanged notification!");
if (mImageFrame) {
mImageFrame->DisconnectMap();
}
}
nsresult nsImageMap::HandleEvent(Event* aEvent) {
nsAutoString eventType;
aEvent->GetType(eventType);
bool focus = eventType.EqualsLiteral("focus");
MOZ_ASSERT(focus == !eventType.EqualsLiteral("blur"),
"Unexpected event type");
// Set which one of our areas changed focus
nsCOMPtr<nsIContent> targetContent = do_QueryInterface(aEvent->GetTarget());
if (!targetContent) {
return NS_OK;
}
for (auto& area : mAreas) {
if (area->mArea == targetContent) {
// Set or Remove internal focus
area->HasFocus(focus);
// Now invalidate the rect
if (mImageFrame) {
mImageFrame->InvalidateFrame();
}
break;
}
}
return NS_OK;
}
void nsImageMap::Destroy() {
FreeAreas();
mImageFrame = nullptr;
mMap->RemoveMutationObserver(this);
}
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