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nsHTMLImageElement.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * 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
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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):
 *
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 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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#include "nsIDOMHTMLImageElement.h"
#include "nsIDOMNSHTMLImageElement.h"
#include "nsIDOMEventTarget.h"
#include "nsGenericHTMLElement.h"
#include "nsImageLoadingContent.h"
#include "nsGkAtoms.h"
#include "nsStyleConsts.h"
#include "nsPresContext.h"
#include "nsIPresShell.h"
#include "nsMappedAttributes.h"
#include "nsIJSNativeInitializer.h"
#include "nsSize.h"
#include "nsIDocument.h"
#include "nsIDOMWindowInternal.h"
#include "nsIDOMDocument.h"
#include "nsIScriptContext.h"
#include "nsIURL.h"
#include "nsIIOService.h"
#include "nsIServiceManager.h"
#include "nsNetUtil.h"
#include "nsContentUtils.h"
#include "nsIFrame.h"
#include "nsNodeInfoManager.h"
#include "nsGUIEvent.h"
#include "nsContentPolicyUtils.h"
#include "nsIDOMWindow.h"

#include "imgIContainer.h"
#include "imgILoader.h"
#include "imgIRequest.h"
#include "imgIDecoderObserver.h"

#include "nsILoadGroup.h"

#include "nsRuleData.h"

#include "nsIJSContextStack.h"
#include "nsImageMapUtils.h"
#include "nsIDOMHTMLMapElement.h"
#include "nsEventDispatcher.h"

#include "nsLayoutUtils.h"

// XXX nav attrs: suppress

class nsHTMLImageElement : public nsGenericHTMLElement,
                           public nsImageLoadingContent,
                           public nsIDOMHTMLImageElement,
                           public nsIDOMNSHTMLImageElement,
                           public nsIJSNativeInitializer
{
public:
  nsHTMLImageElement(nsINodeInfo *aNodeInfo);
  virtual ~nsHTMLImageElement();

  // nsISupports
  NS_DECL_ISUPPORTS_INHERITED

  // nsIDOMNode
  NS_FORWARD_NSIDOMNODE(nsGenericHTMLElement::)

  // nsIDOMElement
  NS_FORWARD_NSIDOMELEMENT(nsGenericHTMLElement::)

  // nsIDOMHTMLElement
  NS_FORWARD_NSIDOMHTMLELEMENT(nsGenericHTMLElement::)

  // nsIDOMHTMLImageElement
  NS_DECL_NSIDOMHTMLIMAGEELEMENT

  // nsIDOMNSHTMLImageElement
  NS_DECL_NSIDOMNSHTMLIMAGEELEMENT

  // nsIJSNativeInitializer
  NS_IMETHOD Initialize(JSContext* aContext, JSObject *aObj,
                        PRUint32 argc, jsval *argv);

  // nsIContent
  virtual PRBool ParseAttribute(PRInt32 aNamespaceID,
                                nsIAtom* aAttribute,
                                const nsAString& aValue,
                                nsAttrValue& aResult);
  virtual nsChangeHint GetAttributeChangeHint(const nsIAtom* aAttribute,
                                              PRInt32 aModType) const;
  NS_IMETHOD_(PRBool) IsAttributeMapped(const nsIAtom* aAttribute) const;
  virtual nsMapRuleToAttributesFunc GetAttributeMappingFunction() const;

  virtual nsresult PreHandleEvent(nsEventChainPreVisitor& aVisitor);

  PRBool IsFocusable(PRInt32 *aTabIndex = nsnull);

  // SetAttr override.  C++ is stupid, so have to override both
  // overloaded methods.
  nsresult SetAttr(PRInt32 aNameSpaceID, nsIAtom* aName,
                   const nsAString& aValue, PRBool aNotify)
  {
    return SetAttr(aNameSpaceID, aName, nsnull, aValue, aNotify);
  }
  virtual nsresult SetAttr(PRInt32 aNameSpaceID, nsIAtom* aName,
                           nsIAtom* aPrefix, const nsAString& aValue,
                           PRBool aNotify);

  // XXXbz What about UnsetAttr?  We don't seem to unload images when
  // that happens...

  virtual nsresult BindToTree(nsIDocument* aDocument, nsIContent* aParent,
                              nsIContent* aBindingParent,
                              PRBool aCompileEventHandlers);

  virtual PRInt32 IntrinsicState() const;
  virtual nsresult Clone(nsINodeInfo *aNodeInfo, nsINode **aResult) const;

protected:
  nsPoint GetXY();
  nsSize GetWidthHeight();
};

nsGenericHTMLElement*
NS_NewHTMLImageElement(nsINodeInfo *aNodeInfo, PRBool aFromParser)
{
  /*
   * nsHTMLImageElement's will be created without a nsINodeInfo passed in
   * if someone says "var img = new Image();" in JavaScript, in a case like
   * that we request the nsINodeInfo from the document's nodeinfo list.
   */
  nsresult rv;
  nsCOMPtr<nsINodeInfo> nodeInfo(aNodeInfo);
  if (!nodeInfo) {
    nsCOMPtr<nsIDocument> doc =
      do_QueryInterface(nsContentUtils::GetDocumentFromCaller());
    NS_ENSURE_TRUE(doc, nsnull);

    rv = doc->NodeInfoManager()->GetNodeInfo(nsGkAtoms::img, nsnull,
                                             kNameSpaceID_None,
                                             getter_AddRefs(nodeInfo));
    NS_ENSURE_SUCCESS(rv, nsnull);
  }

  return new nsHTMLImageElement(nodeInfo);
}

nsHTMLImageElement::nsHTMLImageElement(nsINodeInfo *aNodeInfo)
  : nsGenericHTMLElement(aNodeInfo)
{
}

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


NS_IMPL_ADDREF_INHERITED(nsHTMLImageElement, nsGenericElement)
NS_IMPL_RELEASE_INHERITED(nsHTMLImageElement, nsGenericElement)


// QueryInterface implementation for nsHTMLImageElement
NS_HTML_CONTENT_INTERFACE_TABLE_HEAD(nsHTMLImageElement, nsGenericHTMLElement)
  NS_INTERFACE_TABLE_INHERITED5(nsHTMLImageElement,
                                nsIDOMHTMLImageElement,
                                nsIDOMNSHTMLImageElement,
                                nsIJSNativeInitializer,
                                imgIDecoderObserver,
                                nsIImageLoadingContent)
NS_HTML_CONTENT_INTERFACE_TABLE_TAIL_CLASSINFO(HTMLImageElement)


NS_IMPL_ELEMENT_CLONE(nsHTMLImageElement)


NS_IMPL_STRING_ATTR(nsHTMLImageElement, Name, name)
NS_IMPL_STRING_ATTR(nsHTMLImageElement, Align, align)
NS_IMPL_STRING_ATTR(nsHTMLImageElement, Alt, alt)
NS_IMPL_STRING_ATTR(nsHTMLImageElement, Border, border)
NS_IMPL_INT_ATTR(nsHTMLImageElement, Hspace, hspace)
NS_IMPL_BOOL_ATTR(nsHTMLImageElement, IsMap, ismap)
NS_IMPL_URI_ATTR(nsHTMLImageElement, LongDesc, longdesc)
NS_IMPL_STRING_ATTR(nsHTMLImageElement, Lowsrc, lowsrc)
NS_IMPL_URI_ATTR(nsHTMLImageElement, Src, src)
NS_IMPL_STRING_ATTR(nsHTMLImageElement, UseMap, usemap)
NS_IMPL_INT_ATTR(nsHTMLImageElement, Vspace, vspace)

NS_IMETHODIMP
nsHTMLImageElement::GetComplete(PRBool* aComplete)
{
  NS_PRECONDITION(aComplete, "Null out param!");
  *aComplete = PR_TRUE;

  if (!mCurrentRequest) {
    return NS_OK;
  }

  PRUint32 status;
  mCurrentRequest->GetImageStatus(&status);
  *aComplete =
    (status &
     (imgIRequest::STATUS_LOAD_COMPLETE | imgIRequest::STATUS_ERROR)) != 0;

  return NS_OK;
}

nsPoint
nsHTMLImageElement::GetXY()
{
  nsPoint point(0, 0);

  nsIFrame* frame = GetPrimaryFrame(Flush_Layout);

  if (!frame) {
    return point;
  }

  nsIFrame* layer = nsLayoutUtils::GetClosestLayer(frame->GetParent());
  nsPoint origin(frame->GetOffsetTo(layer));
  // Convert to pixels using that scale
  point.x = nsPresContext::AppUnitsToIntCSSPixels(origin.x);
  point.y = nsPresContext::AppUnitsToIntCSSPixels(origin.y);

  return point;
}

NS_IMETHODIMP
nsHTMLImageElement::GetX(PRInt32* aX)
{
  *aX = GetXY().x;

  return NS_OK;
}

NS_IMETHODIMP
nsHTMLImageElement::GetY(PRInt32* aY)
{
  *aY = GetXY().y;

  return NS_OK;
}

nsSize
nsHTMLImageElement::GetWidthHeight()
{
  nsSize size(0,0);

  nsIFrame* frame = GetPrimaryFrame(Flush_Layout);

  if (frame) {
    size = frame->GetContentRect().Size();

    size.width = nsPresContext::AppUnitsToIntCSSPixels(size.width);
    size.height = nsPresContext::AppUnitsToIntCSSPixels(size.height);
  } else {
    const nsAttrValue* value;
    nsCOMPtr<imgIContainer> image;
    if (mCurrentRequest) {
      mCurrentRequest->GetImage(getter_AddRefs(image));
    }

    if ((value = GetParsedAttr(nsGkAtoms::width)) &&
        value->Type() == nsAttrValue::eInteger) {
      size.width = value->GetIntegerValue();
    } else if (image) {
      image->GetWidth(&size.width);
    }

    if ((value = GetParsedAttr(nsGkAtoms::height)) &&
        value->Type() == nsAttrValue::eInteger) {
      size.height = value->GetIntegerValue();
    } else if (image) {
      image->GetHeight(&size.height);
    }
  }

  return size;
}

NS_IMETHODIMP
nsHTMLImageElement::GetHeight(PRInt32* aHeight)
{
  *aHeight = GetWidthHeight().height;

  return NS_OK;
}

NS_IMETHODIMP
nsHTMLImageElement::SetHeight(PRInt32 aHeight)
{
  nsAutoString val;
  val.AppendInt(aHeight);

  return nsGenericHTMLElement::SetAttr(kNameSpaceID_None, nsGkAtoms::height,
                                       val, PR_TRUE);
}

NS_IMETHODIMP
nsHTMLImageElement::GetWidth(PRInt32* aWidth)
{
  *aWidth = GetWidthHeight().width;

  return NS_OK;
}

NS_IMETHODIMP
nsHTMLImageElement::SetWidth(PRInt32 aWidth)
{
  nsAutoString val;
  val.AppendInt(aWidth);

  return nsGenericHTMLElement::SetAttr(kNameSpaceID_None, nsGkAtoms::width,
                                       val, PR_TRUE);
}

PRBool
nsHTMLImageElement::ParseAttribute(PRInt32 aNamespaceID,
                                   nsIAtom* aAttribute,
                                   const nsAString& aValue,
                                   nsAttrValue& aResult)
{
  if (aNamespaceID == kNameSpaceID_None) {
    if (aAttribute == nsGkAtoms::align) {
      return ParseAlignValue(aValue, aResult);
    }
    if (aAttribute == nsGkAtoms::src) {
      static const char* kWhitespace = " \n\r\t\b";
      aResult.SetTo(nsContentUtils::TrimCharsInSet(kWhitespace, aValue));
      return PR_TRUE;
    }
    if (ParseImageAttribute(aAttribute, aValue, aResult)) {
      return PR_TRUE;
    }
  }

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

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

nsChangeHint
nsHTMLImageElement::GetAttributeChangeHint(const nsIAtom* aAttribute,
                                           PRInt32 aModType) const
{
  nsChangeHint retval =
    nsGenericHTMLElement::GetAttributeChangeHint(aAttribute, aModType);
  if (aAttribute == nsGkAtoms::usemap ||
      aAttribute == nsGkAtoms::ismap) {
    NS_UpdateHint(retval, NS_STYLE_HINT_FRAMECHANGE);
  }
  return retval;
}

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

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


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


nsresult
nsHTMLImageElement::PreHandleEvent(nsEventChainPreVisitor& aVisitor)
{
  // If we are a map and get a mouse click, don't let it be handled by
  // the Generic Element as this could cause a click event to fire
  // twice, once by the image frame for the map and once by the Anchor
  // element. (bug 39723)
  if (aVisitor.mEvent->eventStructType == NS_MOUSE_EVENT &&
      aVisitor.mEvent->message == NS_MOUSE_CLICK &&
      static_cast<nsMouseEvent*>(aVisitor.mEvent)->button ==
        nsMouseEvent::eLeftButton) {
    PRBool isMap = PR_FALSE;
    GetIsMap(&isMap);
    if (isMap) {
      aVisitor.mEventStatus = nsEventStatus_eConsumeNoDefault;
    }
  }
  return nsGenericHTMLElement::PreHandleEvent(aVisitor);
}

PRBool
nsHTMLImageElement::IsFocusable(PRInt32 *aTabIndex)
{
  PRInt32 tabIndex;
  GetTabIndex(&tabIndex);

  if (IsInDoc()) {
    nsAutoString usemap;
    GetUseMap(usemap);
    // XXXbz which document should this be using?  sXBL/XBL2 issue!  I
    // think that GetOwnerDoc() is right, since we don't want to
    // assume stuff about the document we're bound to.
    nsCOMPtr<nsIDOMHTMLMapElement> imageMap =
      nsImageMapUtils::FindImageMap(GetOwnerDoc(), usemap);
    if (imageMap) {
      if (aTabIndex) {
        // Use tab index on individual map areas
        *aTabIndex = (sTabFocusModel & eTabFocus_linksMask)? 0 : -1;
      }
      // Image map is not focusable itself, but flag as tabbable
      // so that image map areas get walked into.
      return PR_FALSE;
    }
  }

  if (aTabIndex) {
    // Can be in tab order if tabindex >=0 and form controls are tabbable.
    *aTabIndex = (sTabFocusModel & eTabFocus_formElementsMask)? tabIndex : -1;
  }

  return tabIndex >= 0;
}

nsresult
nsHTMLImageElement::SetAttr(PRInt32 aNameSpaceID, nsIAtom* aName,
                            nsIAtom* aPrefix, const nsAString& aValue,
                            PRBool aNotify)
{
  // If we plan to call LoadImage, we want to do it first so that the
  // image 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
  // image load from BindToTree.  Skip the LoadImage call in that case.
  if (aNotify &&
      aNameSpaceID == kNameSpaceID_None && aName == nsGkAtoms::src) {

    // If caller is not chrome and dom.disable_image_src_set is true,
    // prevent setting image.src by exiting early
    if (nsContentUtils::GetBoolPref("dom.disable_image_src_set") &&
        !nsContentUtils::IsCallerChrome()) {
      return NS_OK;
    }

    nsCOMPtr<imgIRequest> oldCurrentRequest = mCurrentRequest;

    // Force image loading here, so that we'll try to load the image from
    // network if it's set to be not cacheable...  If we change things so that
    // the state gets in nsGenericElement's attr-setting happen around this
    // LoadImage call, we could start passing PR_FALSE instead of aNotify
    // here.
    LoadImage(aValue, PR_TRUE, aNotify);

    if (mCurrentRequest && !mPendingRequest &&
        oldCurrentRequest != mCurrentRequest) {
      // We have a current request, and it's not the same one as we used
      // to have, and we have no pending request.  So imglib already had
      // that image.  Reset the animation on it -- see bug 210001
      nsCOMPtr<imgIContainer> container;
      mCurrentRequest->GetImage(getter_AddRefs(container));
      if (container) {
        container->ResetAnimation();
      }
    }
  }
    
  return nsGenericHTMLElement::SetAttr(aNameSpaceID, aName, aPrefix, aValue,
                                       aNotify);
}

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

  // Our base URI may have changed; claim that our URI changed, and the
  // nsImageLoadingContent will decide whether a new image load is warranted.
  nsAutoString uri;
  if (GetAttr(kNameSpaceID_None, nsGkAtoms::src, uri)) {
    // Note: no need to notify here; since we're just now being bound
    // we don't have any frames or anything yet.
    LoadImage(uri, PR_FALSE, PR_FALSE);
  }

  return rv;
}

PRInt32
nsHTMLImageElement::IntrinsicState() const
{
  return nsGenericHTMLElement::IntrinsicState() |
    nsImageLoadingContent::ImageState();
}

NS_IMETHODIMP
nsHTMLImageElement::Initialize(JSContext* aContext, JSObject *aObj,
                               PRUint32 argc, jsval *argv)
{
  if (argc <= 0) {
    // Nothing to do here if we don't get any arguments.

    return NS_OK;
  }

  // The first (optional) argument is the width of the image
  int32 width;
  JSBool ret = JS_ValueToInt32(aContext, argv[0], &width);
  NS_ENSURE_TRUE(ret, NS_ERROR_INVALID_ARG);

  nsresult rv = SetIntAttr(nsGkAtoms::width, static_cast<PRInt32>(width));

  if (NS_SUCCEEDED(rv) && (argc > 1)) {
    // The second (optional) argument is the height of the image
    int32 height;
    ret = JS_ValueToInt32(aContext, argv[1], &height);
    NS_ENSURE_TRUE(ret, NS_ERROR_INVALID_ARG);

    rv = SetIntAttr(nsGkAtoms::height, static_cast<PRInt32>(height));
  }

  return rv;
}

NS_IMETHODIMP
nsHTMLImageElement::GetNaturalHeight(PRInt32* aNaturalHeight)
{
  NS_ENSURE_ARG_POINTER(aNaturalHeight);

  *aNaturalHeight = 0;

  if (!mCurrentRequest) {
    return NS_OK;
  }
  
  nsCOMPtr<imgIContainer> image;
  mCurrentRequest->GetImage(getter_AddRefs(image));
  if (!image) {
    return NS_OK;
  }

  image->GetHeight(aNaturalHeight);
  return NS_OK;
}

NS_IMETHODIMP
nsHTMLImageElement::GetNaturalWidth(PRInt32* aNaturalWidth)
{
  NS_ENSURE_ARG_POINTER(aNaturalWidth);

  *aNaturalWidth = 0;

  if (!mCurrentRequest) {
    return NS_OK;
  }
  
  nsCOMPtr<imgIContainer> image;
  mCurrentRequest->GetImage(getter_AddRefs(image));
  if (!image) {
    return NS_OK;
  }

  image->GetWidth(aNaturalWidth);
  return NS_OK;
}



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