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gecko/layout/generic/nsImageMap.cpp
L. David Baron 0354744354 Bug 896138 patch 4: Move restyle management code from nsCSSFrameConstructor to RestyleManager. r=heycam 
This moves restyling management out of nsCSSFrameConstructor (thus
reducing its size), and keeps the restyling code closer together.

This is the first of two big chunks of code moved in this patch series.
A later patch in this series will move related code from nsFrameManager
into the same destination file.
2013-07-20 12:14:25 -07:00

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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/. */
/* code for HTML client-side image maps */
#include "nsImageMap.h"
#include "nsString.h"
#include "nsDOMEvent.h"
#include "nsReadableUtils.h"
#include "nsRenderingContext.h"
#include "nsPresContext.h"
#include "nsIURL.h"
#include "nsIServiceManager.h"
#include "nsNetUtil.h"
#include "nsTextFragment.h"
#include "mozilla/dom/Element.h"
#include "nsIDocument.h"
#include "nsINameSpaceManager.h"
#include "nsGkAtoms.h"
#include "nsIPresShell.h"
#include "nsImageFrame.h"
#include "nsCoord.h"
#include "nsIConsoleService.h"
#include "nsIScriptError.h"
#include "nsIStringBundle.h"
#include "nsContentUtils.h"
#ifdef ACCESSIBILITY
#include "nsAccessibilityService.h"
#endif
namespace dom = mozilla::dom;
static NS_DEFINE_CID(kCStringBundleServiceCID, NS_STRINGBUNDLESERVICE_CID);
class Area {
public:
Area(nsIContent* aArea);
virtual ~Area();
virtual void ParseCoords(const nsAString& aSpec);
virtual bool IsInside(nscoord x, nscoord y) const = 0;
virtual void Draw(nsIFrame* aFrame, nsRenderingContext& aRC) = 0;
virtual void GetRect(nsIFrame* aFrame, nsRect& aRect) = 0;
void HasFocus(bool aHasFocus);
nsCOMPtr<nsIContent> mArea;
nscoord* mCoords;
int32_t mNumCoords;
bool mHasFocus;
};
Area::Area(nsIContent* aArea)
: mArea(aArea)
{
MOZ_COUNT_CTOR(Area);
NS_PRECONDITION(mArea, "How did that happen?");
mCoords = nullptr;
mNumCoords = 0;
mHasFocus = false;
}
Area::~Area()
{
MOZ_COUNT_DTOR(Area);
delete [] mCoords;
}
#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) {
nsIDocument* doc = aContent->OwnerDoc();
nsContentUtils::ReportToConsole(
aFlags, "ImageMap", doc,
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 = ToNewCString(aSpec);
if (cp) {
char *tptr;
char *n_str;
int32_t i, cnt;
int32_t *value_list;
/*
* Nothing in an empty list
*/
mNumCoords = 0;
mCoords = nullptr;
if (*cp == '\0')
{
nsMemory::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')
{
nsMemory::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.
*/
value_list = new nscoord[cnt];
if (!value_list)
{
nsMemory::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 = value_list;
nsMemory::Free(cp);
}
}
void Area::HasFocus(bool aHasFocus)
{
mHasFocus = aHasFocus;
}
//----------------------------------------------------------------------
class DefaultArea : public Area {
public:
DefaultArea(nsIContent* aArea);
virtual bool IsInside(nscoord x, nscoord y) const;
virtual void Draw(nsIFrame* aFrame, nsRenderingContext& aRC);
virtual void GetRect(nsIFrame* aFrame, nsRect& aRect);
};
DefaultArea::DefaultArea(nsIContent* aArea)
: Area(aArea)
{
}
bool DefaultArea::IsInside(nscoord x, nscoord y) const
{
return true;
}
void DefaultArea::Draw(nsIFrame* aFrame, nsRenderingContext& aRC)
{
if (mHasFocus) {
nsRect r = aFrame->GetRect();
r.MoveTo(0, 0);
nscoord x1 = r.x;
nscoord y1 = r.y;
const nscoord kOnePixel = nsPresContext::CSSPixelsToAppUnits(1);
nscoord x2 = r.XMost() - kOnePixel;
nscoord y2 = r.YMost() - kOnePixel;
// XXX aRC.DrawRect(r) result is ugly, that's why we use DrawLine.
aRC.DrawLine(x1, y1, x1, y2);
aRC.DrawLine(x1, y2, x2, y2);
aRC.DrawLine(x1, y1, x2, y1);
aRC.DrawLine(x2, y1, x2, y2);
}
}
void DefaultArea::GetRect(nsIFrame* aFrame, nsRect& aRect)
{
aRect = aFrame->GetRect();
aRect.MoveTo(0, 0);
}
//----------------------------------------------------------------------
class RectArea : public Area {
public:
RectArea(nsIContent* aArea);
virtual void ParseCoords(const nsAString& aSpec);
virtual bool IsInside(nscoord x, nscoord y) const;
virtual void Draw(nsIFrame* aFrame, nsRenderingContext& aRC);
virtual void GetRect(nsIFrame* aFrame, nsRect& aRect);
};
RectArea::RectArea(nsIContent* 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, nsRenderingContext& aRC)
{
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");
aRC.DrawLine(x1, y1, x1, y2);
aRC.DrawLine(x1, y2, x2, y2);
aRC.DrawLine(x1, y1, x2, y1);
aRC.DrawLine(x2, y1, x2, y2);
}
}
}
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 : public Area {
public:
PolyArea(nsIContent* aArea);
virtual void ParseCoords(const nsAString& aSpec);
virtual bool IsInside(nscoord x, nscoord y) const;
virtual void Draw(nsIFrame* aFrame, nsRenderingContext& aRC);
virtual void GetRect(nsIFrame* aFrame, nsRect& aRect);
};
PolyArea::PolyArea(nsIContent* 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, nsRenderingContext& aRC)
{
if (mHasFocus) {
if (mNumCoords >= 6) {
nscoord x0 = nsPresContext::CSSPixelsToAppUnits(mCoords[0]);
nscoord y0 = nsPresContext::CSSPixelsToAppUnits(mCoords[1]);
nscoord x1, y1;
for (int32_t i = 2; i < mNumCoords; i += 2) {
x1 = nsPresContext::CSSPixelsToAppUnits(mCoords[i]);
y1 = nsPresContext::CSSPixelsToAppUnits(mCoords[i+1]);
aRC.DrawLine(x0, y0, x1, y1);
x0 = x1;
y0 = y1;
}
x1 = nsPresContext::CSSPixelsToAppUnits(mCoords[0]);
y1 = nsPresContext::CSSPixelsToAppUnits(mCoords[1]);
aRC.DrawLine(x0, y0, x1, y1);
}
}
}
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 : public Area {
public:
CircleArea(nsIContent* aArea);
virtual void ParseCoords(const nsAString& aSpec);
virtual bool IsInside(nscoord x, nscoord y) const;
virtual void Draw(nsIFrame* aFrame, nsRenderingContext& aRC);
virtual void GetRect(nsIFrame* aFrame, nsRect& aRect);
};
CircleArea::CircleArea(nsIContent* 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, nsRenderingContext& aRC)
{
if (mHasFocus) {
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;
}
nscoord x = x1 - radius;
nscoord y = y1 - radius;
nscoord w = 2 * radius;
aRC.DrawEllipse(x, y, w, w);
}
}
}
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),
mContainsBlockContents(false)
{
}
nsImageMap::~nsImageMap()
{
NS_ASSERTION(mAreas.Length() == 0, "Destroy was not called");
}
NS_IMPL_ISUPPORTS2(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
uint32_t i, n = mAreas.Length();
for (i = 0; i < n; i++) {
Area* area = mAreas.ElementAt(i);
if (area->mArea == aContent) {
aBounds = nsRect();
area->GetRect(mImageFrame, aBounds);
return NS_OK;
}
}
return NS_ERROR_FAILURE;
}
void
nsImageMap::FreeAreas()
{
uint32_t i, n = mAreas.Length();
for (i = 0; i < n; i++) {
Area* area = mAreas.ElementAt(i);
if (area->mArea->IsInDoc()) {
NS_ASSERTION(area->mArea->GetPrimaryFrame() == mImageFrame,
"Unexpected primary frame");
area->mArea->SetPrimaryFrame(nullptr);
}
area->mArea->RemoveSystemEventListener(NS_LITERAL_STRING("focus"), this,
false);
area->mArea->RemoveSystemEventListener(NS_LITERAL_STRING("blur"), this,
false);
delete area;
}
mAreas.Clear();
}
nsresult
nsImageMap::Init(nsImageFrame* aImageFrame, nsIContent* aMap)
{
NS_PRECONDITION(aMap, "null ptr");
if (!aMap) {
return NS_ERROR_NULL_POINTER;
}
mImageFrame = aImageFrame;
mMap = aMap;
mMap->AddMutationObserver(this);
// "Compile" the areas in the map into faster access versions
return UpdateAreas();
}
nsresult
nsImageMap::SearchForAreas(nsIContent* aParent, bool& aFoundArea,
bool& aFoundAnchor)
{
nsresult rv = NS_OK;
uint32_t i, n = aParent->GetChildCount();
// Look for <area> or <a> elements. We'll use whichever type we find first.
for (i = 0; i < n; i++) {
nsIContent *child = aParent->GetChildAt(i);
if (child->IsHTML()) {
// If we haven't determined that the map element contains an
// <a> element yet, then look for <area>.
if (!aFoundAnchor && child->Tag() == nsGkAtoms::area) {
aFoundArea = true;
rv = AddArea(child);
NS_ENSURE_SUCCESS(rv, rv);
// Continue to next child. This stops mContainsBlockContents 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 we haven't determined that the map element contains an
// <area> element yet, then look for <a>.
if (!aFoundArea && child->Tag() == nsGkAtoms::a) {
aFoundAnchor = true;
rv = AddArea(child);
NS_ENSURE_SUCCESS(rv, rv);
}
}
if (child->IsElement()) {
mContainsBlockContents = true;
rv = SearchForAreas(child, aFoundArea, aFoundAnchor);
NS_ENSURE_SUCCESS(rv, rv);
}
}
return NS_OK;
}
nsresult
nsImageMap::UpdateAreas()
{
// Get rid of old area data
FreeAreas();
bool foundArea = false;
bool foundAnchor = false;
mContainsBlockContents = false;
nsresult rv = SearchForAreas(mMap, foundArea, foundAnchor);
#ifdef ACCESSIBILITY
if (NS_SUCCEEDED(rv)) {
nsAccessibilityService* accService = GetAccService();
if (accService) {
accService->UpdateImageMap(mImageFrame);
}
}
#endif
return rv;
}
nsresult
nsImageMap::AddArea(nsIContent* aArea)
{
static nsIContent::AttrValuesArray strings[] =
{&nsGkAtoms::rect, &nsGkAtoms::rectangle,
&nsGkAtoms::circle, &nsGkAtoms::circ,
&nsGkAtoms::_default,
&nsGkAtoms::poly, &nsGkAtoms::polygon,
nullptr};
Area* area;
switch (aArea->FindAttrValueIn(kNameSpaceID_None, nsGkAtoms::shape,
strings, eIgnoreCase)) {
case nsIContent::ATTR_VALUE_NO_MATCH:
case nsIContent::ATTR_MISSING:
case 0:
case 1:
area = new RectArea(aArea);
break;
case 2:
case 3:
area = new CircleArea(aArea);
break;
case 4:
area = new DefaultArea(aArea);
break;
case 5:
case 6:
area = new PolyArea(aArea);
break;
default:
area = nullptr;
NS_NOTREACHED("FindAttrValueIn returned an unexpected value.");
break;
}
if (!area)
return NS_ERROR_OUT_OF_MEMORY;
//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(area);
return NS_OK;
}
nsIContent*
nsImageMap::GetArea(nscoord aX, nscoord aY) const
{
NS_ASSERTION(mMap, "Not initialized");
uint32_t i, n = mAreas.Length();
for (i = 0; i < n; i++) {
Area* area = mAreas.ElementAt(i);
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, nsRenderingContext& aRC)
{
uint32_t i, n = mAreas.Length();
for (i = 0; i < n; i++) {
Area* area = mAreas.ElementAt(i);
area->Draw(aFrame, aRC);
}
}
void
nsImageMap::MaybeUpdateAreas(nsIContent *aContent)
{
if (aContent == mMap || mContainsBlockContents) {
UpdateAreas();
}
}
void
nsImageMap::AttributeChanged(nsIDocument* aDocument,
dom::Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
// 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->IsHTML() &&
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(nsIDocument *aDocument,
nsIContent* aContainer,
nsIContent* aFirstNewContent,
int32_t /* unused */)
{
MaybeUpdateAreas(aContainer);
}
void
nsImageMap::ContentInserted(nsIDocument *aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t /* unused */)
{
MaybeUpdateAreas(aContainer);
}
void
nsImageMap::ContentRemoved(nsIDocument *aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer,
nsIContent* aPreviousSibling)
{
MaybeUpdateAreas(aContainer);
}
void
nsImageMap::ParentChainChanged(nsIContent* aContent)
{
NS_ASSERTION(aContent == mMap,
"Unexpected ParentChainChanged notification!");
if (mImageFrame) {
mImageFrame->DisconnectMap();
}
}
nsresult
nsImageMap::HandleEvent(nsIDOMEvent* aEvent)
{
nsAutoString eventType;
aEvent->GetType(eventType);
bool focus = eventType.EqualsLiteral("focus");
NS_ABORT_IF_FALSE(focus == !eventType.EqualsLiteral("blur"),
"Unexpected event type");
//Set which one of our areas changed focus
nsCOMPtr<nsIContent> targetContent = do_QueryInterface(
aEvent->InternalDOMEvent()->GetTarget());
if (!targetContent) {
return NS_OK;
}
uint32_t i, n = mAreas.Length();
for (i = 0; i < n; i++) {
Area* area = mAreas.ElementAt(i);
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(void)
{
FreeAreas();
mImageFrame = nullptr;
mMap->RemoveMutationObserver(this);
}
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