gecko-dev/layout/forms/nsLegendFrame.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.org 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): 
 */

// YY need to pass isMultiple before create called

#include "nsLegendFrame.h"
#include "nsIDOMNode.h"
#include "nsIDOMHTMLLegendElement.h"
#include "nsCSSRendering.h"
#include "nsIContent.h"
#include "nsIFrame.h"
#include "nsISupports.h"
#include "nsIAtom.h"
#include "nsIHTMLContent.h"
#include "nsHTMLIIDs.h"
#include "nsHTMLParts.h"
#include "nsHTMLAtoms.h"
#include "nsIStyleContext.h"
#include "nsStyleConsts.h"
#include "nsStyleUtil.h"
#include "nsFont.h"
#include "nsFormControlFrame.h"

static NS_DEFINE_IID(kLegendFrameCID, NS_LEGEND_FRAME_CID);
static NS_DEFINE_IID(kIDOMHTMLLegendElementIID, NS_IDOMHTMLLEGENDELEMENT_IID);
 
nsresult
NS_NewLegendFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame)
{
  NS_PRECONDITION(aNewFrame, "null OUT ptr");
  if (nsnull == aNewFrame) {
    return NS_ERROR_NULL_POINTER;
  }
  nsLegendFrame* it = new (aPresShell) nsLegendFrame;
  if (!it) {
    return NS_ERROR_OUT_OF_MEMORY;
  }
  *aNewFrame = it;
  return NS_OK;
}

nsLegendFrame::nsLegendFrame()
  : nsAreaFrame()
{
  mPresContext    = nsnull;
}

nsLegendFrame::~nsLegendFrame()
{
  nsFormControlFrame::RegUnRegAccessKey(mPresContext, NS_STATIC_CAST(nsIFrame*, this), PR_FALSE);
}

// Frames are not refcounted, no need to AddRef
NS_IMETHODIMP
nsLegendFrame::QueryInterface(REFNSIID aIID, void** aInstancePtrResult)
{
  NS_PRECONDITION(nsnull != aInstancePtrResult, "null pointer");
  if (nsnull == aInstancePtrResult) {
    return NS_ERROR_NULL_POINTER;
  }
  if (aIID.Equals(kLegendFrameCID)) {
    *aInstancePtrResult = (void*) ((nsLegendFrame*)this);
    return NS_OK;
  }
  return nsHTMLContainerFrame::QueryInterface(aIID, aInstancePtrResult);
}

NS_IMETHODIMP 
nsLegendFrame::Reflow(nsIPresContext*          aPresContext,
                     nsHTMLReflowMetrics&     aDesiredSize,
                     const nsHTMLReflowState& aReflowState,
                     nsReflowStatus&          aStatus)
{
  DO_GLOBAL_REFLOW_COUNT("nsLegendFrame", aReflowState.reason);
  if (eReflowReason_Initial == aReflowState.reason) {
    mPresContext = aPresContext;
    nsFormControlFrame::RegUnRegAccessKey(aPresContext, NS_STATIC_CAST(nsIFrame*, this), PR_TRUE);
  } 
  return nsAreaFrame::Reflow(aPresContext, aDesiredSize, aReflowState, aStatus);
}


PRInt32 nsLegendFrame::GetAlign()
{
  PRInt32 intValue = NS_STYLE_TEXT_ALIGN_LEFT;
  nsIHTMLContent* content = nsnull;
  mContent->QueryInterface(kIHTMLContentIID, (void**) &content);
  if (nsnull != content) {
    nsHTMLValue value;
    if (NS_CONTENT_ATTR_HAS_VALUE == (content->GetHTMLAttribute(nsHTMLAtoms::align, value))) {
      if (eHTMLUnit_Enumerated == value.GetUnit()) {
        intValue = value.GetIntValue();
      }
    }
    NS_RELEASE(content);
  }
  return intValue;
}

#ifdef NS_DEBUG
NS_IMETHODIMP
nsLegendFrame::GetFrameName(nsString& aResult) const
{
  return MakeFrameName("Legend", aResult);
}
#endif