Mozilla/mozilla/layout/html/content/src/nsHTMLHRElement.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * The contents of this file are subject to the Netscape 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 http://www.mozilla.org/NPL/
 *
 * 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 Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 * Contributor(s): 
 */
#include "nsIDOMHTMLHRElement.h"
#include "nsIScriptObjectOwner.h"
#include "nsIDOMEventReceiver.h"
#include "nsIHTMLContent.h"
#include "nsGenericHTMLElement.h"
#include "nsHTMLAtoms.h"
#include "nsHTMLIIDs.h"
#include "nsIStyleContext.h"
#include "nsIMutableStyleContext.h"
#include "nsStyleConsts.h"
#include "nsIPresContext.h"
#include "nsIHTMLAttributes.h"

static NS_DEFINE_IID(kIDOMHTMLHRElementIID, NS_IDOMHTMLHRELEMENT_IID);

class nsHTMLHRElement : public nsIDOMHTMLHRElement,
                        public nsIJSScriptObject,
                        public nsIHTMLContent
{
public:
  nsHTMLHRElement(nsIAtom* aTag);
  virtual ~nsHTMLHRElement();

  // nsISupports
  NS_DECL_ISUPPORTS

  // nsIDOMNode
  NS_IMPL_IDOMNODE_USING_GENERIC(mInner)

  // nsIDOMElement
  NS_IMPL_IDOMELEMENT_USING_GENERIC(mInner)

  // nsIDOMHTMLElement
  NS_IMPL_IDOMHTMLELEMENT_USING_GENERIC(mInner)

  // nsIDOMHTMLHRElement
  NS_IMETHOD GetAlign(nsString& aAlign);
  NS_IMETHOD SetAlign(const nsString& aAlign);
  NS_IMETHOD GetNoShade(PRBool* aNoShade);
  NS_IMETHOD SetNoShade(PRBool aNoShade);
  NS_IMETHOD GetSize(nsString& aSize);
  NS_IMETHOD SetSize(const nsString& aSize);
  NS_IMETHOD GetWidth(nsString& aWidth);
  NS_IMETHOD SetWidth(const nsString& aWidth);

  // nsIJSScriptObject
  NS_IMPL_IJSSCRIPTOBJECT_USING_GENERIC(mInner)

  // nsIContent
  NS_IMPL_ICONTENT_USING_GENERIC(mInner)

  // nsIHTMLContent
  NS_IMPL_IHTMLCONTENT_USING_GENERIC(mInner)

protected:
  nsGenericHTMLLeafElement mInner;
};

nsresult
NS_NewHTMLHRElement(nsIHTMLContent** aInstancePtrResult, nsIAtom* aTag)
{
  NS_PRECONDITION(nsnull != aInstancePtrResult, "null ptr");
  if (nsnull == aInstancePtrResult) {
    return NS_ERROR_NULL_POINTER;
  }
  nsIHTMLContent* it = new nsHTMLHRElement(aTag);
  if (nsnull == it) {
    return NS_ERROR_OUT_OF_MEMORY;
  }
  return it->QueryInterface(kIHTMLContentIID, (void**) aInstancePtrResult);
}


nsHTMLHRElement::nsHTMLHRElement(nsIAtom* aTag)
{
  NS_INIT_REFCNT();
  mInner.Init(this, aTag);
}

nsHTMLHRElement::~nsHTMLHRElement()
{
}

NS_IMPL_ADDREF(nsHTMLHRElement)

NS_IMPL_RELEASE(nsHTMLHRElement)

nsresult
nsHTMLHRElement::QueryInterface(REFNSIID aIID, void** aInstancePtr)
{
  NS_IMPL_HTML_CONTENT_QUERY_INTERFACE(aIID, aInstancePtr, this)
  if (aIID.Equals(kIDOMHTMLHRElementIID)) {
    nsIDOMHTMLHRElement* tmp = this;
    *aInstancePtr = (void*) tmp;
    NS_ADDREF_THIS();
    return NS_OK;
  }
  return NS_NOINTERFACE;
}

nsresult
nsHTMLHRElement::CloneNode(PRBool aDeep, nsIDOMNode** aReturn)
{
  nsHTMLHRElement* it = new nsHTMLHRElement(mInner.mTag);
  if (nsnull == it) {
    return NS_ERROR_OUT_OF_MEMORY;
  }
  mInner.CopyInnerTo(this, &it->mInner, aDeep);
  return it->QueryInterface(kIDOMNodeIID, (void**) aReturn);
}

NS_IMPL_STRING_ATTR(nsHTMLHRElement, Align, align)

#ifdef DEBUG_SET_ATTR
NS_IMETHODIMP
nsHTMLHRElement::GetNoShade(PRBool* aValue)
{
  nsHTMLValue val;
  nsresult rv = mInner.GetAttribute(nsHTMLAtoms::noshade, val);
  *aValue = NS_CONTENT_ATTR_NOT_THERE != rv;
  return NS_OK;
}
NS_IMETHODIMP
nsHTMLHRElement::SetNoShade(PRBool aValue)
{
  nsAutoString empty;
  if (aValue) {
    return mInner.SetAttr(nsHTMLAtoms::noshade, empty);
  }
  else {
    mInner.UnsetAttr(nsHTMLAtoms::noshade);
    return NS_OK;
  }
}
#else
NS_IMPL_BOOL_ATTR(nsHTMLHRElement, NoShade, noshade)
#endif

NS_IMPL_STRING_ATTR(nsHTMLHRElement, Size, size)
NS_IMPL_STRING_ATTR(nsHTMLHRElement, Width, width)

static nsGenericHTMLElement::EnumTable kAlignTable[] = {
  { "left", NS_STYLE_TEXT_ALIGN_LEFT },
  { "right", NS_STYLE_TEXT_ALIGN_RIGHT },
  { "center", NS_STYLE_TEXT_ALIGN_CENTER },
  { 0 }
};

NS_IMETHODIMP
nsHTMLHRElement::StringToAttribute(nsIAtom* aAttribute,
                                   const nsString& aValue,
                                   nsHTMLValue& aResult)
{
  if (aAttribute == nsHTMLAtoms::width) {
    if (nsGenericHTMLElement::ParseValueOrPercent(aValue, aResult,
                                                  eHTMLUnit_Pixel)) {
      return NS_CONTENT_ATTR_HAS_VALUE;
    }
  }
  else if (aAttribute == nsHTMLAtoms::size) {
    if (nsGenericHTMLElement::ParseValue(aValue, 1, 100, aResult, eHTMLUnit_Pixel)) {
      return NS_CONTENT_ATTR_HAS_VALUE;
    }
  }
  else if (aAttribute == nsHTMLAtoms::noshade) {
    aResult.SetEmptyValue();
    return NS_CONTENT_ATTR_HAS_VALUE;
  }
  else if (aAttribute == nsHTMLAtoms::align) {
    if (nsGenericHTMLElement::ParseEnumValue(aValue, kAlignTable, aResult)) {
      return NS_CONTENT_ATTR_HAS_VALUE;
    }
  }
  return NS_CONTENT_ATTR_NOT_THERE;
}

NS_IMETHODIMP
nsHTMLHRElement::AttributeToString(nsIAtom* aAttribute,
                                   const nsHTMLValue& aValue,
                                   nsString& aResult) const
{
  if (aAttribute == nsHTMLAtoms::align) {
    if (eHTMLUnit_Enumerated == aValue.GetUnit()) {
      nsGenericHTMLElement::EnumValueToString(aValue, kAlignTable, aResult);
      return NS_CONTENT_ATTR_HAS_VALUE;
    }
  }
  return mInner.AttributeToString(aAttribute, aValue, aResult);
}

static void
MapAttributesInto(const nsIHTMLMappedAttributes* aAttributes,
                  nsIMutableStyleContext* aContext,
                  nsIPresContext* aPresContext)
{
  if (nsnull != aAttributes) {
    nsHTMLValue value;
    // align: enum
    aAttributes->GetAttribute(nsHTMLAtoms::align, value);
    if (eHTMLUnit_Enumerated == value.GetUnit()) {
      // Map align attribute into auto side margins
      nsStyleSpacing* spacing = (nsStyleSpacing*)
        aContext->GetMutableStyleData(eStyleStruct_Spacing);
      nsStyleCoord otto(eStyleUnit_Auto);
      nsStyleCoord zero(nscoord(0));
      switch (value.GetIntValue()) {
      case NS_STYLE_TEXT_ALIGN_LEFT:
        spacing->mMargin.SetLeft(zero);
        spacing->mMargin.SetRight(otto);
        break;
      case NS_STYLE_TEXT_ALIGN_RIGHT:
        spacing->mMargin.SetLeft(otto);
        spacing->mMargin.SetRight(zero);
        break;
      case NS_STYLE_TEXT_ALIGN_CENTER:
        spacing->mMargin.SetLeft(otto);
        spacing->mMargin.SetRight(otto);
        break;
      }
    }

    // width: pixel, percent
    float p2t;
    aPresContext->GetScaledPixelsToTwips(&p2t);
    nsStylePosition* pos = (nsStylePosition*)
      aContext->GetMutableStyleData(eStyleStruct_Position);
    aAttributes->GetAttribute(nsHTMLAtoms::width, value);
    if (eHTMLUnit_Pixel == value.GetUnit()) {
      nscoord twips = NSIntPixelsToTwips(value.GetPixelValue(), p2t);
      pos->mWidth.SetCoordValue(twips);
    }
    else if (eHTMLUnit_Percent == value.GetUnit()) {
      pos->mWidth.SetPercentValue(value.GetPercentValue());
    }

    // size: pixel
    aAttributes->GetAttribute(nsHTMLAtoms::size, value);
    if (eHTMLUnit_Pixel == value.GetUnit()) {
      nscoord twips = NSIntPixelsToTwips(value.GetPixelValue(), p2t);
      pos->mHeight.SetCoordValue(twips);
    }
  }
  nsGenericHTMLElement::MapCommonAttributesInto(aAttributes, aContext,
                                                aPresContext);
}

NS_IMETHODIMP
nsHTMLHRElement::GetMappedAttributeImpact(const nsIAtom* aAttribute,
                                          PRInt32& aHint) const
{
  if (aAttribute == nsHTMLAtoms::noshade) {
    aHint = NS_STYLE_HINT_VISUAL;
  }
  else if ((aAttribute == nsHTMLAtoms::align) ||
           (aAttribute == nsHTMLAtoms::width) ||
           (aAttribute == nsHTMLAtoms::size)) {
    aHint = NS_STYLE_HINT_REFLOW;
  }
  else if (! nsGenericHTMLElement::GetCommonMappedAttributesImpact(aAttribute, aHint)) {
    aHint = NS_STYLE_HINT_CONTENT;
  }
  return NS_OK;
}


NS_IMETHODIMP
nsHTMLHRElement::GetAttributeMappingFunctions(nsMapAttributesFunc& aFontMapFunc,
                                              nsMapAttributesFunc& aMapFunc) const
{
  aFontMapFunc = nsnull;
  aMapFunc = &MapAttributesInto;
  return NS_OK;
}


NS_IMETHODIMP
nsHTMLHRElement::HandleDOMEvent(nsIPresContext* aPresContext,
                                nsEvent* aEvent,
                                nsIDOMEvent** aDOMEvent,
                                PRUint32 aFlags,
                                nsEventStatus* aEventStatus)
{
  return mInner.HandleDOMEvent(aPresContext, aEvent, aDOMEvent,
                               aFlags, aEventStatus);
}


NS_IMETHODIMP
nsHTMLHRElement::SizeOf(nsISizeOfHandler* aSizer, PRUint32* aResult) const
{
  return mInner.SizeOf(aSizer, aResult, sizeof(*this));
}