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gecko-dev/dom/html/HTMLBodyElement.cpp
Kirk Steuber e74f1cd513 Bug 1363481 - Add the old attribute value as a parameter to Element::AfterSetAttr r=bz 
In order to facilitate the movement of code with side-effects called by Element::SetAttr to Element::BeforeSetAttr and Element::AfterSetAttr, Element::AfterSetAttr should have access to the old value of the attribute. This includes information about whether there was previously a value set or not.

Accomplishing this involved passing an additional argument through functions that find and change the old attribute value in order to ensure that we can differentiate between an empty old value and an absent old value (attribute was not set).

Note that while I tried to ensure that accurate values (and their absence) are reported to Element::AfterSetAttr, I largely ignored SVG. While the old value reported for SVG values should be however accurate the value already being reported to SetAttrAndNotify was, SVG elements do not currently report unset values properly because they will never pass a null pointer to SetAttrAndNotify.

MozReview-Commit-ID: K1mha8CNFZP

--HG--
extra : rebase_source : 42776eb01451d371e4aebcc17fe3dd112c8d268b
2017-05-18 14:09:01 -07:00

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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/. */
#include "HTMLBodyElement.h"
#include "mozilla/dom/HTMLBodyElementBinding.h"
#include "mozilla/GenericSpecifiedValuesInlines.h"
#include "nsAttrValueInlines.h"
#include "nsGkAtoms.h"
#include "nsStyleConsts.h"
#include "nsPresContext.h"
#include "nsIPresShell.h"
#include "nsIDocument.h"
#include "nsHTMLStyleSheet.h"
#include "nsIEditor.h"
#include "nsMappedAttributes.h"
#include "nsIDocShell.h"
#include "nsRuleWalker.h"
#include "nsGlobalWindow.h"
NS_IMPL_NS_NEW_HTML_ELEMENT(Body)
namespace mozilla {
namespace dom {
//----------------------------------------------------------------------
HTMLBodyElement::~HTMLBodyElement()
{
}
JSObject*
HTMLBodyElement::WrapNode(JSContext *aCx, JS::Handle<JSObject*> aGivenProto)
{
return HTMLBodyElementBinding::Wrap(aCx, this, aGivenProto);
}
NS_IMPL_ISUPPORTS_INHERITED(HTMLBodyElement, nsGenericHTMLElement,
nsIDOMHTMLBodyElement)
NS_IMPL_ELEMENT_CLONE(HTMLBodyElement)
NS_IMETHODIMP
HTMLBodyElement::SetBackground(const nsAString& aBackground)
{
ErrorResult rv;
SetBackground(aBackground, rv);
return rv.StealNSResult();
}
NS_IMETHODIMP
HTMLBodyElement::GetBackground(nsAString& aBackground)
{
DOMString background;
GetBackground(background);
background.ToString(aBackground);
return NS_OK;
}
NS_IMETHODIMP
HTMLBodyElement::SetVLink(const nsAString& aVLink)
{
ErrorResult rv;
SetVLink(aVLink, rv);
return rv.StealNSResult();
}
NS_IMETHODIMP
HTMLBodyElement::GetVLink(nsAString& aVLink)
{
DOMString vLink;
GetVLink(vLink);
vLink.ToString(aVLink);
return NS_OK;
}
NS_IMETHODIMP
HTMLBodyElement::SetALink(const nsAString& aALink)
{
ErrorResult rv;
SetALink(aALink, rv);
return rv.StealNSResult();
}
NS_IMETHODIMP
HTMLBodyElement::GetALink(nsAString& aALink)
{
DOMString aLink;
GetALink(aLink);
aLink.ToString(aALink);
return NS_OK;
}
NS_IMETHODIMP
HTMLBodyElement::SetLink(const nsAString& aLink)
{
ErrorResult rv;
SetLink(aLink, rv);
return rv.StealNSResult();
}
NS_IMETHODIMP
HTMLBodyElement::GetLink(nsAString& aLink)
{
DOMString link;
GetLink(link);
link.ToString(aLink);
return NS_OK;
}
NS_IMETHODIMP
HTMLBodyElement::SetText(const nsAString& aText)
{
ErrorResult rv;
SetText(aText, rv);
return rv.StealNSResult();
}
NS_IMETHODIMP
HTMLBodyElement::GetText(nsAString& aText)
{
DOMString text;
GetText(text);
text.ToString(aText);
return NS_OK;
}
NS_IMETHODIMP
HTMLBodyElement::SetBgColor(const nsAString& aBgColor)
{
ErrorResult rv;
SetBgColor(aBgColor, rv);
return rv.StealNSResult();
}
NS_IMETHODIMP
HTMLBodyElement::GetBgColor(nsAString& aBgColor)
{
DOMString bgColor;
GetBgColor(bgColor);
bgColor.ToString(aBgColor);
return NS_OK;
}
bool
HTMLBodyElement::ParseAttribute(int32_t aNamespaceID,
nsIAtom* aAttribute,
const nsAString& aValue,
nsAttrValue& aResult)
{
if (aNamespaceID == kNameSpaceID_None) {
if (aAttribute == nsGkAtoms::bgcolor ||
aAttribute == nsGkAtoms::text ||
aAttribute == nsGkAtoms::link ||
aAttribute == nsGkAtoms::alink ||
aAttribute == nsGkAtoms::vlink) {
return aResult.ParseColor(aValue);
}
if (aAttribute == nsGkAtoms::marginwidth ||
aAttribute == nsGkAtoms::marginheight ||
aAttribute == nsGkAtoms::topmargin ||
aAttribute == nsGkAtoms::bottommargin ||
aAttribute == nsGkAtoms::leftmargin ||
aAttribute == nsGkAtoms::rightmargin) {
return aResult.ParseIntWithBounds(aValue, 0);
}
}
return nsGenericHTMLElement::ParseBackgroundAttribute(aNamespaceID,
aAttribute, aValue,
aResult) ||
nsGenericHTMLElement::ParseAttribute(aNamespaceID, aAttribute, aValue,
aResult);
}
void
HTMLBodyElement::MapAttributesIntoRule(const nsMappedAttributes* aAttributes,
GenericSpecifiedValues* aData)
{
if (aData->mSIDs & NS_STYLE_INHERIT_BIT(Margin)) {
// This is the one place where we try to set the same property
// multiple times in presentation attributes. Servo does not support
// querying if a property is set (because that is O(n) behavior
// in ServoSpecifiedValues). Instead, we use the below values to keep
// track of whether we have already set a property, and if so, what value
// we set it to (which is used when handling margin
// attributes from the containing frame element)
int32_t bodyMarginWidth = -1;
int32_t bodyMarginHeight = -1;
int32_t bodyTopMargin = -1;
int32_t bodyBottomMargin = -1;
int32_t bodyLeftMargin = -1;
int32_t bodyRightMargin = -1;
// check the mode (fortunately, the GenericSpecifiedValues has a presContext for us to use!)
NS_ASSERTION(aData->mPresContext, "null presContext in MapAttributesIntoRule was unexpected");
nsCompatibility mode = aData->mPresContext->CompatibilityMode();
const nsAttrValue* value;
// if marginwidth/marginheight are set, reflect them as 'margin'
value = aAttributes->GetAttr(nsGkAtoms::marginwidth);
if (value && value->Type() == nsAttrValue::eInteger) {
bodyMarginWidth = value->GetIntegerValue();
if (bodyMarginWidth < 0) {
bodyMarginWidth = 0;
}
aData->SetPixelValueIfUnset(eCSSProperty_margin_left, (float)bodyMarginWidth);
aData->SetPixelValueIfUnset(eCSSProperty_margin_right, (float)bodyMarginWidth);
}
value = aAttributes->GetAttr(nsGkAtoms::marginheight);
if (value && value->Type() == nsAttrValue::eInteger) {
bodyMarginHeight = value->GetIntegerValue();
if (bodyMarginHeight < 0) {
bodyMarginHeight = 0;
}
aData->SetPixelValueIfUnset(eCSSProperty_margin_top, (float)bodyMarginHeight);
aData->SetPixelValueIfUnset(eCSSProperty_margin_bottom, (float)bodyMarginHeight);
}
// topmargin (IE-attribute)
if (bodyMarginHeight == -1) {
value = aAttributes->GetAttr(nsGkAtoms::topmargin);
if (value && value->Type() == nsAttrValue::eInteger) {
bodyTopMargin = value->GetIntegerValue();
if (bodyTopMargin < 0) {
bodyTopMargin = 0;
}
aData->SetPixelValueIfUnset(eCSSProperty_margin_top, (float)bodyTopMargin);
}
}
// bottommargin (IE-attribute)
if (bodyMarginHeight == -1) {
value = aAttributes->GetAttr(nsGkAtoms::bottommargin);
if (value && value->Type() == nsAttrValue::eInteger) {
bodyBottomMargin = value->GetIntegerValue();
if (bodyBottomMargin < 0) {
bodyBottomMargin = 0;
}
aData->SetPixelValueIfUnset(eCSSProperty_margin_bottom, (float)bodyBottomMargin);
}
}
// leftmargin (IE-attribute)
if (bodyMarginWidth == -1) {
value = aAttributes->GetAttr(nsGkAtoms::leftmargin);
if (value && value->Type() == nsAttrValue::eInteger) {
bodyLeftMargin = value->GetIntegerValue();
if (bodyLeftMargin < 0) {
bodyLeftMargin = 0;
}
aData->SetPixelValueIfUnset(eCSSProperty_margin_left, (float)bodyLeftMargin);
}
}
// rightmargin (IE-attribute)
if (bodyMarginWidth == -1) {
value = aAttributes->GetAttr(nsGkAtoms::rightmargin);
if (value && value->Type() == nsAttrValue::eInteger) {
bodyRightMargin = value->GetIntegerValue();
if (bodyRightMargin < 0) {
bodyRightMargin = 0;
}
aData->SetPixelValueIfUnset(eCSSProperty_margin_right, (float)bodyRightMargin);
}
}
// if marginwidth or marginheight is set in the <frame> and not set in the <body>
// reflect them as margin in the <body>
if (bodyMarginWidth == -1 || bodyMarginHeight == -1) {
nsCOMPtr<nsIDocShell> docShell(aData->mPresContext->GetDocShell());
if (docShell) {
nscoord frameMarginWidth=-1; // default value
nscoord frameMarginHeight=-1; // default value
docShell->GetMarginWidth(&frameMarginWidth); // -1 indicates not set
docShell->GetMarginHeight(&frameMarginHeight);
if (frameMarginWidth >= 0 && bodyMarginWidth == -1) { // set in <frame> & not in <body>
if (eCompatibility_NavQuirks == mode) {
if (bodyMarginHeight == -1 && 0 > frameMarginHeight) { // nav quirk
frameMarginHeight = 0;
}
}
}
if (frameMarginHeight >= 0 && bodyMarginHeight == -1) { // set in <frame> & not in <body>
if (eCompatibility_NavQuirks == mode) {
if (bodyMarginWidth == -1 && 0 > frameMarginWidth) { // nav quirk
frameMarginWidth = 0;
}
}
}
if (bodyMarginWidth == -1 && frameMarginWidth >= 0) {
if (bodyLeftMargin == -1) {
aData->SetPixelValueIfUnset(eCSSProperty_margin_left, (float)frameMarginWidth);
}
if (bodyRightMargin == -1) {
aData->SetPixelValueIfUnset(eCSSProperty_margin_right, (float)frameMarginWidth);
}
}
if (bodyMarginHeight == -1 && frameMarginHeight >= 0) {
if (bodyTopMargin == -1) {
aData->SetPixelValueIfUnset(eCSSProperty_margin_top, (float)frameMarginHeight);
}
if (bodyBottomMargin == -1) {
aData->SetPixelValueIfUnset(eCSSProperty_margin_bottom, (float)frameMarginHeight);
}
}
}
}
}
if (aData->ShouldComputeStyleStruct(NS_STYLE_INHERIT_BIT(Display))) {
// When display if first asked for, go ahead and get our colors set up.
nsIPresShell *presShell = aData->PresContext()->GetPresShell();
if (presShell) {
nsIDocument *doc = presShell->GetDocument();
if (doc) {
nsHTMLStyleSheet* styleSheet = doc->GetAttributeStyleSheet();
if (styleSheet) {
const nsAttrValue* value;
nscolor color;
value = aAttributes->GetAttr(nsGkAtoms::link);
if (value && value->GetColorValue(color)) {
styleSheet->SetLinkColor(color);
}
value = aAttributes->GetAttr(nsGkAtoms::alink);
if (value && value->GetColorValue(color)) {
styleSheet->SetActiveLinkColor(color);
}
value = aAttributes->GetAttr(nsGkAtoms::vlink);
if (value && value->GetColorValue(color)) {
styleSheet->SetVisitedLinkColor(color);
}
}
}
}
}
if (aData->ShouldComputeStyleStruct(NS_STYLE_INHERIT_BIT(Color))) {
if (!aData->PropertyIsSet(eCSSProperty_color) &&
aData->PresContext()->UseDocumentColors()) {
// color: color
nscolor color;
const nsAttrValue* value = aAttributes->GetAttr(nsGkAtoms::text);
if (value && value->GetColorValue(color))
aData->SetColorValue(eCSSProperty_color, color);
}
}
nsGenericHTMLElement::MapBackgroundAttributesInto(aAttributes, aData);
nsGenericHTMLElement::MapCommonAttributesInto(aAttributes, aData);
}
nsMapRuleToAttributesFunc
HTMLBodyElement::GetAttributeMappingFunction() const
{
return &MapAttributesIntoRule;
}
NS_IMETHODIMP_(bool)
HTMLBodyElement::IsAttributeMapped(const nsIAtom* aAttribute) const
{
static const MappedAttributeEntry attributes[] = {
{ &nsGkAtoms::link },
{ &nsGkAtoms::vlink },
{ &nsGkAtoms::alink },
{ &nsGkAtoms::text },
{ &nsGkAtoms::marginwidth },
{ &nsGkAtoms::marginheight },
{ &nsGkAtoms::topmargin },
{ &nsGkAtoms::rightmargin },
{ &nsGkAtoms::bottommargin },
{ &nsGkAtoms::leftmargin },
{ nullptr },
};
static const MappedAttributeEntry* const map[] = {
attributes,
sCommonAttributeMap,
sBackgroundAttributeMap,
};
return FindAttributeDependence(aAttribute, map);
}
already_AddRefed<nsIEditor>
HTMLBodyElement::GetAssociatedEditor()
{
nsCOMPtr<nsIEditor> editor = GetEditorInternal();
if (editor) {
return editor.forget();
}
// Make sure this is the actual body of the document
if (!IsCurrentBodyElement()) {
return nullptr;
}
// For designmode, try to get document's editor
nsPresContext* presContext = GetPresContext(eForComposedDoc);
if (!presContext) {
return nullptr;
}
nsCOMPtr<nsIDocShell> docShell = presContext->GetDocShell();
if (!docShell) {
return nullptr;
}
docShell->GetEditor(getter_AddRefs(editor));
return editor.forget();
}
bool
HTMLBodyElement::IsEventAttributeName(nsIAtom *aName)
{
return nsContentUtils::IsEventAttributeName(aName,
EventNameType_HTML |
EventNameType_HTMLBodyOrFramesetOnly);
}
nsresult
HTMLBodyElement::BindToTree(nsIDocument* aDocument, nsIContent* aParent,
nsIContent* aBindingParent,
bool aCompileEventHandlers)
{
nsresult rv = nsGenericHTMLElement::BindToTree(aDocument, aParent,
aBindingParent,
aCompileEventHandlers);
NS_ENSURE_SUCCESS(rv, rv);
return mAttrsAndChildren.ForceMapped(this, OwnerDoc());
}
nsresult
HTMLBodyElement::AfterSetAttr(int32_t aNameSpaceID, nsIAtom* aName,
const nsAttrValue* aValue,
const nsAttrValue* aOldValue, bool aNotify)
{
nsresult rv = nsGenericHTMLElement::AfterSetAttr(aNameSpaceID,
aName, aValue, aOldValue,
aNotify);
NS_ENSURE_SUCCESS(rv, rv);
// if the last mapped attribute was removed, don't clear the
// nsMappedAttributes, our style can still depend on the containing frame element
if (!aValue && IsAttributeMapped(aName)) {
nsresult rv = mAttrsAndChildren.ForceMapped(this, OwnerDoc());
NS_ENSURE_SUCCESS(rv, rv);
}
return NS_OK;
}
#define EVENT(name_, id_, type_, struct_) /* nothing; handled by the superclass */
// nsGenericHTMLElement::GetOnError returns
// already_AddRefed<EventHandlerNonNull> while other getters return
// EventHandlerNonNull*, so allow passing in the type to use here.
#define WINDOW_EVENT_HELPER(name_, type_) \
type_* \
HTMLBodyElement::GetOn##name_() \
{ \
if (nsPIDOMWindowInner* win = OwnerDoc()->GetInnerWindow()) { \
nsGlobalWindow* globalWin = nsGlobalWindow::Cast(win); \
return globalWin->GetOn##name_(); \
} \
return nullptr; \
} \
void \
HTMLBodyElement::SetOn##name_(type_* handler) \
{ \
nsPIDOMWindowInner* win = OwnerDoc()->GetInnerWindow(); \
if (!win) { \
return; \
} \
\
nsGlobalWindow* globalWin = nsGlobalWindow::Cast(win); \
return globalWin->SetOn##name_(handler); \
}
#define WINDOW_EVENT(name_, id_, type_, struct_) \
WINDOW_EVENT_HELPER(name_, EventHandlerNonNull)
#define BEFOREUNLOAD_EVENT(name_, id_, type_, struct_) \
WINDOW_EVENT_HELPER(name_, OnBeforeUnloadEventHandlerNonNull)
#include "mozilla/EventNameList.h" // IWYU pragma: keep
#undef BEFOREUNLOAD_EVENT
#undef WINDOW_EVENT
#undef WINDOW_EVENT_HELPER
#undef EVENT
} // namespace dom
} // namespace mozilla
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