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fune/layout/generic/nsImageMap.cpp
Ting-Yu Lin 03683daeeb Bug 1751473 Part 2 - Use CSSIntPoint instead of nsIntPoint in image event handling code. r=emilio 
The old code operates in the CSS pixel coordinate, so we should use the type
system to express that. With this patch, nsImageControlFrame, nsImageFrame, and
nsImageMap now have no usage of nsIntPoint.

Differential Revision: https://phabricator.services.mozilla.com/D136647
2022-01-22 01:07:19 +00:00

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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 "nsContentUtils.h"
#include "nsLayoutUtils.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, "Layout: ImageMap"_ns, aContent->OwnerDoc(),
nsContentUtils::eLAYOUT_PROPERTIES, aMessageName,
nsTArray<nsString>(), /* params */
nullptr,
PromiseFlatString(u"coords=\""_ns + aCoordsSpec +
u"\""_ns)); /* 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->GetPrimaryFrame() == mImageFrame) {
aArea->SetPrimaryFrame(nullptr);
}
aArea->RemoveSystemEventListener(u"focus"_ns, this, false);
aArea->RemoveSystemEventListener(u"blur"_ns, 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(u"focus"_ns, this, false, false);
aArea->AddSystemEventListener(u"blur"_ns, 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));
}
HTMLAreaElement* nsImageMap::GetArea(const CSSIntPoint& aPt) const {
NS_ASSERTION(mMap, "Not initialized");
for (const auto& area : mAreas) {
if (area->IsInside(aPt.x, aPt.y)) {
return area->mArea;
}
}
return nullptr;
}
HTMLAreaElement* 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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