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nsHTMLSharedObjectElement.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// vim:set et sw=2 sts=2 cin:
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
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 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Communicator client code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
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 * in which case the provisions of the GPL or the LGPL are applicable instead
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#include "nsGenericHTMLElement.h"
#include "nsObjectLoadingContent.h"
#include "nsGkAtoms.h"
#include "nsDOMError.h"
#include "nsIDocument.h"
#include "nsIDOMDocument.h"
#include "nsIDOMHTMLAppletElement.h"
#include "nsIDOMHTMLEmbedElement.h"
#ifdef MOZ_SVG
#include "nsIDOMGetSVGDocument.h"
#include "nsIDOMSVGDocument.h"
#endif

// XXX this is to get around conflicts with windows.h defines
// introduced through jni.h
#if defined (XP_WIN) && ! defined (WINCE)
#undef GetClassName
#undef GetObject
#endif

class nsHTMLSharedObjectElement : public nsGenericHTMLElement,
                                  public nsObjectLoadingContent,
                                  public nsIDOMHTMLAppletElement,
                                  public nsIDOMHTMLEmbedElement
#ifdef MOZ_SVG
                                  , public nsIDOMGetSVGDocument
#endif
{
public:
  nsHTMLSharedObjectElement(nsINodeInfo *aNodeInfo,
                            PRBool aFromParser = PR_FALSE);
  virtual ~nsHTMLSharedObjectElement();

  // nsISupports
  NS_DECL_ISUPPORTS_INHERITED

  // nsIDOMNode
  NS_FORWARD_NSIDOMNODE(nsGenericHTMLElement::)

  // nsIDOMElement
  NS_FORWARD_NSIDOMELEMENT(nsGenericHTMLElement::)

  // nsIDOMHTMLElement
  NS_FORWARD_NSIDOMHTMLELEMENT(nsGenericHTMLElement::)

  // nsIDOMHTMLAppletElement
  NS_DECL_NSIDOMHTMLAPPLETELEMENT

  // Can't use macro for nsIDOMHTMLEmbedElement because it has conflicts with
  // NS_DECL_NSIDOMHTMLAPPLETELEMENT.

  // nsIDOMHTMLEmbedElement
  NS_IMETHOD GetSrc(nsAString &aSrc);
  NS_IMETHOD SetSrc(const nsAString &aSrc);
  NS_IMETHOD GetType(nsAString &aType);
  NS_IMETHOD SetType(const nsAString &aType);

#ifdef MOZ_SVG
  // nsIDOMGetSVGDocument
  NS_DECL_NSIDOMGETSVGDOCUMENT
#endif

  virtual nsresult BindToTree(nsIDocument *aDocument, nsIContent *aParent,
                              nsIContent *aBindingParent,
                              PRBool aCompileEventHandlers);
  virtual void UnbindFromTree(PRBool aDeep = PR_TRUE,
                              PRBool aNullParent = PR_TRUE);
  virtual nsresult SetAttr(PRInt32 aNameSpaceID, nsIAtom *aName,
                           nsIAtom *aPrefix, const nsAString &aValue,
                           PRBool aNotify);

  NS_IMETHOD GetTabIndex(PRInt32 *aTabIndex);
  NS_IMETHOD SetTabIndex(PRInt32 aTabIndex);
  virtual PRBool IsFocusable(PRInt32 *aTabIndex = nsnull);
  virtual PRUint32 GetDesiredIMEState();

  virtual nsresult DoneAddingChildren(PRBool aHaveNotified);
  virtual PRBool IsDoneAddingChildren();

  virtual PRBool ParseAttribute(PRInt32 aNamespaceID,
                                nsIAtom *aAttribute,
                                const nsAString &aValue,
                                nsAttrValue &aResult);
  virtual nsMapRuleToAttributesFunc GetAttributeMappingFunction() const;
  NS_IMETHOD_(PRBool) IsAttributeMapped(const nsIAtom *aAttribute) const;
  virtual PRInt32 IntrinsicState() const;

  // nsObjectLoadingContent
  virtual PRUint32 GetCapabilities() const;

  virtual nsresult Clone(nsINodeInfo *aNodeInfo, nsINode **aResult) const;

  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED_NO_UNLINK(nsHTMLSharedObjectElement,
                                                     nsGenericHTMLElement)

private:
  /**
   * Calls LoadObject with the correct arguments to start the plugin load.
   */
  NS_HIDDEN_(void) StartObjectLoad(PRBool aNotify);

  void GetTypeAttrValue(nsCString &aValue) const
  {
    if (mNodeInfo->Equals(nsGkAtoms::applet)) {
      aValue.AppendLiteral("application/x-java-vm");
    }
    else {
      nsAutoString type;
      GetAttr(kNameSpaceID_None, nsGkAtoms::type, type);

      CopyUTF16toUTF8(type, aValue);
    }
  }

  nsIAtom *URIAttrName() const
  {
    return mNodeInfo->Equals(nsGkAtoms::applet) ?
           nsGkAtoms::code :
           nsGkAtoms::src;
  }

  // mIsDoneAddingChildren is only really used for <applet>.  This boolean is
  // always true for <embed>, per the documentation in nsIContent.h.
  PRPackedBool mIsDoneAddingChildren;
};


NS_IMPL_NS_NEW_HTML_ELEMENT_CHECK_PARSER(SharedObject)


nsHTMLSharedObjectElement::nsHTMLSharedObjectElement(nsINodeInfo *aNodeInfo,
                                                     PRBool aFromParser)
  : nsGenericHTMLElement(aNodeInfo),
    mIsDoneAddingChildren(aNodeInfo->Equals(nsGkAtoms::embed) || !aFromParser)
{
}

nsHTMLSharedObjectElement::~nsHTMLSharedObjectElement()
{
  DestroyImageLoadingContent();
}

PRBool
nsHTMLSharedObjectElement::IsDoneAddingChildren()
{
  return mIsDoneAddingChildren;
}

nsresult
nsHTMLSharedObjectElement::DoneAddingChildren(PRBool aHaveNotified)
{
  if (!mIsDoneAddingChildren) {
    mIsDoneAddingChildren = PR_TRUE;

    // If we're already in a document, we need to trigger the load
    // Otherwise, BindToTree takes care of that.
    if (IsInDoc()) {
      StartObjectLoad(aHaveNotified);
    }
  }

  return NS_OK;
}

NS_IMPL_CYCLE_COLLECTION_CLASS(nsHTMLSharedObjectElement)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(nsHTMLSharedObjectElement,
                                                  nsGenericHTMLElement)
  tmp->Traverse(cb);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

NS_IMPL_ADDREF_INHERITED(nsHTMLSharedObjectElement, nsGenericElement) 
NS_IMPL_RELEASE_INHERITED(nsHTMLSharedObjectElement, nsGenericElement) 

NS_HTML_CONTENT_CC_INTERFACE_TABLE_AMBIGUOUS_HEAD(nsHTMLSharedObjectElement,
                                                  nsGenericHTMLElement,
                                                  nsIDOMHTMLAppletElement)
  NS_INTERFACE_TABLE_INHERITED8(nsHTMLSharedObjectElement,
                                imgIDecoderObserver,
                                nsIRequestObserver,
                                nsIStreamListener,
                                nsIFrameLoaderOwner,
                                nsIObjectLoadingContent,
                                nsIImageLoadingContent,
                                nsIInterfaceRequestor,
                                nsIChannelEventSink)
  NS_INTERFACE_TABLE_TO_MAP_SEGUE
  NS_INTERFACE_MAP_ENTRY_IF_TAG(nsIDOMHTMLAppletElement, applet)
  NS_INTERFACE_MAP_ENTRY_IF_TAG(nsIDOMHTMLEmbedElement, embed)
#ifdef MOZ_SVG
  NS_INTERFACE_MAP_ENTRY_IF_TAG(nsIDOMGetSVGDocument, embed)
#endif
  NS_INTERFACE_MAP_ENTRY_CONTENT_CLASSINFO_IF_TAG(HTMLAppletElement, applet)
  NS_INTERFACE_MAP_ENTRY_CONTENT_CLASSINFO_IF_TAG(HTMLEmbedElement, embed)
NS_HTML_CONTENT_INTERFACE_MAP_END

NS_IMPL_ELEMENT_CLONE(nsHTMLSharedObjectElement)

nsresult
nsHTMLSharedObjectElement::BindToTree(nsIDocument *aDocument,
                                      nsIContent *aParent,
                                      nsIContent *aBindingParent,
                                      PRBool aCompileEventHandlers)
{
  nsresult rv = nsGenericHTMLElement::BindToTree(aDocument, aParent,
                                                 aBindingParent,
                                                 aCompileEventHandlers);
  NS_ENSURE_SUCCESS(rv, rv);

  // If we already have all the children, start the load.
  if (mIsDoneAddingChildren) {
    // Don't need to notify: We have no frames yet, since we weren't in a
    // document
    StartObjectLoad(PR_FALSE);
  }

  return NS_OK;
}

void
nsHTMLSharedObjectElement::UnbindFromTree(PRBool aDeep,
                                          PRBool aNullParent)
{
  RemovedFromDocument();
  nsGenericHTMLElement::UnbindFromTree(aDeep, aNullParent);
}



nsresult
nsHTMLSharedObjectElement::SetAttr(PRInt32 aNameSpaceID, nsIAtom *aName,
                                   nsIAtom *aPrefix, const nsAString &aValue,
                                   PRBool aNotify)
{
  // If we plan to call LoadObject, we want to do it first so that the
  // object load kicks off _before_ the reflow triggered by the SetAttr.  But if
  // aNotify is false, we are coming from the parser or some such place; we'll
  // get bound after all the attributes have been set, so we'll do the
  // object load from BindToTree/DoneAddingChildren.
  // Skip the LoadObject call in that case.
  // We also don't want to start loading the object when we're not yet in
  // a document, just in case that the caller wants to set additional
  // attributes before inserting the node into the document.
  if (aNotify && IsInDoc() && mIsDoneAddingChildren &&
      aNameSpaceID == kNameSpaceID_None && aName == URIAttrName()) {
    nsCAutoString type;
    GetTypeAttrValue(type);
    LoadObject(aValue, aNotify, type, PR_TRUE);
  }

  return nsGenericHTMLElement::SetAttr(aNameSpaceID, aName, aPrefix, aValue,
                                       aNotify);
}

PRBool
nsHTMLSharedObjectElement::IsFocusable(PRInt32 *aTabIndex)
{
  if (mNodeInfo->Equals(nsGkAtoms::embed) || Type() == eType_Plugin) {
    // Has plugin content: let the plugin decide what to do in terms of
    // internal focus from mouse clicks
    if (aTabIndex) {
      GetTabIndex(aTabIndex);
    }
  
    return PR_TRUE;
  }

  return nsGenericHTMLElement::IsFocusable(aTabIndex);
}

PRUint32
nsHTMLSharedObjectElement::GetDesiredIMEState()
{
  if (Type() == eType_Plugin) {
    return nsIContent::IME_STATUS_ENABLE;
  }
   
  return nsGenericHTMLElement::GetDesiredIMEState();
}

NS_IMPL_STRING_ATTR(nsHTMLSharedObjectElement, Align, align)
NS_IMPL_STRING_ATTR(nsHTMLSharedObjectElement, Alt, alt)
NS_IMPL_STRING_ATTR(nsHTMLSharedObjectElement, Archive, archive)
NS_IMPL_URI_ATTR_WITH_BASE(nsHTMLSharedObjectElement, Code, code, codebase)
NS_IMPL_URI_ATTR(nsHTMLSharedObjectElement, CodeBase, codebase)
NS_IMPL_STRING_ATTR(nsHTMLSharedObjectElement, Height, height)
NS_IMPL_INT_ATTR(nsHTMLSharedObjectElement, Hspace, hspace)
NS_IMPL_STRING_ATTR(nsHTMLSharedObjectElement, Name, name)
NS_IMPL_URI_ATTR_WITH_BASE(nsHTMLSharedObjectElement, Object, object, codebase)
NS_IMPL_URI_ATTR(nsHTMLSharedObjectElement, Src, src)
NS_IMPL_INT_ATTR(nsHTMLSharedObjectElement, TabIndex, tabindex)
NS_IMPL_STRING_ATTR(nsHTMLSharedObjectElement, Type, type)
NS_IMPL_INT_ATTR(nsHTMLSharedObjectElement, Vspace, vspace)
NS_IMPL_STRING_ATTR(nsHTMLSharedObjectElement, Width, width)

#ifdef MOZ_SVG
NS_IMETHODIMP
nsHTMLSharedObjectElement::GetSVGDocument(nsIDOMSVGDocument **aResult)
{
  NS_ENSURE_ARG_POINTER(aResult);

  *aResult = nsnull;

  if (!IsInDoc()) {
    return NS_OK;
  }

  // XXXbz should this use GetCurrentDoc()?  sXBL/XBL2 issue!
  nsIDocument *sub_doc = GetOwnerDoc()->GetSubDocumentFor(this);
  if (!sub_doc) {
    return NS_OK;
  }

  return CallQueryInterface(sub_doc, aResult);
}
#endif

PRBool
nsHTMLSharedObjectElement::ParseAttribute(PRInt32 aNamespaceID,
                                          nsIAtom *aAttribute,
                                          const nsAString &aValue,
                                          nsAttrValue &aResult)
{
  if (aNamespaceID == kNameSpaceID_None) {
    if (aAttribute == nsGkAtoms::align) {
      return ParseAlignValue(aValue, aResult);
    }
    if (ParseImageAttribute(aAttribute, aValue, aResult)) {
      return PR_TRUE;
    }
  }

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

static void
MapAttributesIntoRule(const nsMappedAttributes *aAttributes,
                      nsRuleData *aData)
{
  nsGenericHTMLElement::MapImageBorderAttributeInto(aAttributes, aData);
  nsGenericHTMLElement::MapImageMarginAttributeInto(aAttributes, aData);
  nsGenericHTMLElement::MapImageSizeAttributesInto(aAttributes, aData);
  nsGenericHTMLElement::MapImageAlignAttributeInto(aAttributes, aData);
  nsGenericHTMLElement::MapCommonAttributesInto(aAttributes, aData);
}

NS_IMETHODIMP_(PRBool)
nsHTMLSharedObjectElement::IsAttributeMapped(const nsIAtom *aAttribute) const
{
  static const MappedAttributeEntry* const map[] = {
    sCommonAttributeMap,
    sImageMarginSizeAttributeMap,
    sImageBorderAttributeMap,
    sImageAlignAttributeMap,
  };

  return FindAttributeDependence(aAttribute, map, NS_ARRAY_LENGTH(map));
}


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

void
nsHTMLSharedObjectElement::StartObjectLoad(PRBool aNotify)
{
  nsCAutoString type;
  GetTypeAttrValue(type);

  nsAutoString uri;
  if (!GetAttr(kNameSpaceID_None, URIAttrName(), uri)) {
    // Be sure to call the nsIURI version if we have no attribute
    // That handles the case where no URI is specified. An empty string would
    // get interpreted as the page itself, instead of absence of URI.
    LoadObject(nsnull, aNotify, type);
  }
  else {
    LoadObject(uri, aNotify, type);
  }
}

PRInt32
nsHTMLSharedObjectElement::IntrinsicState() const
{
  return nsGenericHTMLElement::IntrinsicState() | ObjectState();
}

PRUint32
nsHTMLSharedObjectElement::GetCapabilities() const
{
  PRUint32 capabilities = eSupportPlugins | eOverrideServerType;
  if (mNodeInfo->Equals(nsGkAtoms::embed)) {
    capabilities |=
#ifdef MOZ_SVG
                    eSupportSVG |
#endif
                    eSupportImages;
  }

  return capabilities;
}

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