Quelle HTMLBodyElement.cpp Sprache: C

/* -*- 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/AttributeStyles.h"
#include "mozilla/EditorBase.h"
#include "mozilla/HTMLEditor.h"
#include "mozilla/MappedDeclarationsBuilder.h"
#include "mozilla/TextEditor.h"
#include "mozilla/dom/BindContext.h"
#include "mozilla/dom/Document.h"
#include "nsAttrValueInlines.h"
#include "nsGkAtoms.h"
#include "nsStyleConsts.h"
#include "nsPresContext.h"
#include "DocumentInlines.h"
#include "nsDocShell.h"
#include "nsIDocShell.h"
#include "nsGlobalWindowInner.h"

NS_IMPL_NS_NEW_HTML_ELEMENT(Body)

namespace mozilla::dom {

//----------------------------------------------------------------------

HTMLBodyElement::~HTMLBodyElement() = default;

JSObject* HTMLBodyElement::WrapNode(JSContext* aCx,
                                    JS::Handle<JSObject*> aGivenProto) {
  return HTMLBodyElement_Binding::Wrap(aCx, this, aGivenProto);
}

NS_IMPL_ELEMENT_CLONE(HTMLBodyElement)

bool HTMLBodyElement::ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute,
                                     const nsAString& aValue,
                                     nsIPrincipal* aMaybeScriptedPrincipal,
                                     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.ParseNonNegativeIntValue(aValue);
    }
  }

  return nsGenericHTMLElement::ParseBackgroundAttribute(
             aNamespaceID, aAttribute, aValue, aResult) ||
         nsGenericHTMLElement::ParseAttribute(aNamespaceID, aAttribute, aValue,
                                              aMaybeScriptedPrincipal, aResult);
}

void HTMLBodyElement::MapAttributesIntoRule(
    MappedDeclarationsBuilder& aBuilder) {
  // 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;

  const nsAttrValue* value;
  // if marginwidth/marginheight are set, reflect them as 'margin'
  value = aBuilder.GetAttr(nsGkAtoms::marginwidth);
  if (value && value->Type() == nsAttrValue::eInteger) {
    bodyMarginWidth = value->GetIntegerValue();
    if (bodyMarginWidth < 0) {
      bodyMarginWidth = 0;
    }
    aBuilder.SetPixelValueIfUnset(eCSSProperty_margin_left,
                                  (float)bodyMarginWidth);
    aBuilder.SetPixelValueIfUnset(eCSSProperty_margin_right,
                                  (float)bodyMarginWidth);
  }

  value = aBuilder.GetAttr(nsGkAtoms::marginheight);
  if (value && value->Type() == nsAttrValue::eInteger) {
    bodyMarginHeight = value->GetIntegerValue();
    if (bodyMarginHeight < 0) {
      bodyMarginHeight = 0;
    }
    aBuilder.SetPixelValueIfUnset(eCSSProperty_margin_top,
                                  (float)bodyMarginHeight);
    aBuilder.SetPixelValueIfUnset(eCSSProperty_margin_bottom,
                                  (float)bodyMarginHeight);
  }

  // topmargin (IE-attribute)
  if (bodyMarginHeight == -1) {
    value = aBuilder.GetAttr(nsGkAtoms::topmargin);
    if (value && value->Type() == nsAttrValue::eInteger) {
      bodyTopMargin = value->GetIntegerValue();
      if (bodyTopMargin < 0) {
        bodyTopMargin = 0;
      }
      aBuilder.SetPixelValueIfUnset(eCSSProperty_margin_top,
                                    (float)bodyTopMargin);
    }
  }
  // bottommargin (IE-attribute)

  if (bodyMarginHeight == -1) {
    value = aBuilder.GetAttr(nsGkAtoms::bottommargin);
    if (value && value->Type() == nsAttrValue::eInteger) {
      bodyBottomMargin = value->GetIntegerValue();
      if (bodyBottomMargin < 0) {
        bodyBottomMargin = 0;
      }
      aBuilder.SetPixelValueIfUnset(eCSSProperty_margin_bottom,
                                    (float)bodyBottomMargin);
    }
  }

  // leftmargin (IE-attribute)
  if (bodyMarginWidth == -1) {
    value = aBuilder.GetAttr(nsGkAtoms::leftmargin);
    if (value && value->Type() == nsAttrValue::eInteger) {
      bodyLeftMargin = value->GetIntegerValue();
      if (bodyLeftMargin < 0) {
        bodyLeftMargin = 0;
      }
      aBuilder.SetPixelValueIfUnset(eCSSProperty_margin_left,
                                    (float)bodyLeftMargin);
    }
  }
  // rightmargin (IE-attribute)
  if (bodyMarginWidth == -1) {
    value = aBuilder.GetAttr(nsGkAtoms::rightmargin);
    if (value && value->Type() == nsAttrValue::eInteger) {
      bodyRightMargin = value->GetIntegerValue();
      if (bodyRightMargin < 0) {
        bodyRightMargin = 0;
      }
      aBuilder.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) {
    if (nsDocShell* ds = nsDocShell::Cast(aBuilder.Document().GetDocShell())) {
      CSSIntSize margins = ds->GetFrameMargins();
      int32_t frameMarginWidth = margins.width;
      int32_t frameMarginHeight = margins.height;

      if (bodyMarginWidth == -1 && frameMarginWidth >= 0) {
        if (bodyLeftMargin == -1) {
          aBuilder.SetPixelValueIfUnset(eCSSProperty_margin_left,
                                        (float)frameMarginWidth);
        }
        if (bodyRightMargin == -1) {
          aBuilder.SetPixelValueIfUnset(eCSSProperty_margin_right,
                                        (float)frameMarginWidth);
        }
      }

      if (bodyMarginHeight == -1 && frameMarginHeight >= 0) {
        if (bodyTopMargin == -1) {
          aBuilder.SetPixelValueIfUnset(eCSSProperty_margin_top,
                                        (float)frameMarginHeight);
        }
        if (bodyBottomMargin == -1) {
          aBuilder.SetPixelValueIfUnset(eCSSProperty_margin_bottom,
                                        (float)frameMarginHeight);
        }
      }
    }
  }

  // When display if first asked for, go ahead and get our colors set up.
  if (AttributeStyles* attrStyles = aBuilder.Document().GetAttributeStyles()) {
    nscolor color;
    value = aBuilder.GetAttr(nsGkAtoms::link);
    if (value && value->GetColorValue(color)) {
      attrStyles->SetLinkColor(color);
    }

    value = aBuilder.GetAttr(nsGkAtoms::alink);
    if (value && value->GetColorValue(color)) {
      attrStyles->SetActiveLinkColor(color);
    }

    value = aBuilder.GetAttr(nsGkAtoms::vlink);
    if (value && value->GetColorValue(color)) {
      attrStyles->SetVisitedLinkColor(color);
    }
  }

  if (!aBuilder.PropertyIsSet(eCSSProperty_color)) {
    // color: color
    nscolor color;
    value = aBuilder.GetAttr(nsGkAtoms::text);
    if (value && value->GetColorValue(color)) {
      aBuilder.SetColorValue(eCSSProperty_color, color);
    }
  }

  nsGenericHTMLElement::MapBackgroundAttributesInto(aBuilder);
  nsGenericHTMLElement::MapCommonAttributesInto(aBuilder);
}

nsMapRuleToAttributesFunc HTMLBodyElement::GetAttributeMappingFunction() const {
  return &MapAttributesIntoRule;
}

NS_IMETHODIMP_(bool)
HTMLBodyElement::IsAttributeMapped(const nsAtom* 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<EditorBase> HTMLBodyElement::GetAssociatedEditor() {
  MOZ_ASSERT(!GetTextEditorInternal());

  // Make sure this is the actual body of the document
  if (this != OwnerDoc()->GetBodyElement()) {
    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;
  }

  RefPtr<HTMLEditor> htmlEditor = docShell->GetHTMLEditor();
  return htmlEditor.forget();
}

bool HTMLBodyElement::IsEventAttributeNameInternal(nsAtom* aName) {
  return nsContentUtils::IsEventAttributeName(
      aName, EventNameType_HTML | EventNameType_HTMLBodyOrFramesetOnly);
}

nsresult HTMLBodyElement::BindToTree(BindContext& aContext, nsINode& aParent) {
  mAttrs.MarkAsPendingPresAttributeEvaluation();
  return nsGenericHTMLElement::BindToTree(aContext, aParent);
}

void HTMLBodyElement::FrameMarginsChanged() {
  MOZ_ASSERT(IsInComposedDoc());
  if (IsPendingMappedAttributeEvaluation()) {
    return;
  }
  if (mAttrs.MarkAsPendingPresAttributeEvaluation()) {
    OwnerDoc()->ScheduleForPresAttrEvaluation(this);
  }
}

#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()) {      \
      nsGlobalWindowInner* globalWin = nsGlobalWindowInner::Cast(win); \
      return globalWin->GetOn##name_();                                \
    }                                                                  \
    return nullptr;                                                    \
  }                                                                    \
  void HTMLBodyElement::SetOn##name_(type_* handler) {                 \
    nsPIDOMWindowInner* win = OwnerDoc()->GetInnerWindow();            \
    if (!win) {                                                        \
      return;                                                          \
    }                                                                  \
                                                                       \
    nsGlobalWindowInner* globalWin = nsGlobalWindowInner::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 mozilla::dom

quality100%

¤ Dauer der Verarbeitung: 0.1 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.