gecko/layout/svg/base/src/nsSVGTSpanFrame.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** 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
 * http://www.mozilla.org/MPL/
 *
 * 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 the Mozilla SVG project.
 *
 * The Initial Developer of the Original Code is
 * Crocodile Clips Ltd..
 * Portions created by the Initial Developer are Copyright (C) 2002
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Alex Fritze <alex.fritze@crocodile-clips.com> (original author)
 *
 * 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"),
 * 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 "nsIDOMSVGTSpanElement.h"
#include "nsSVGTSpanFrame.h"
#include "nsSVGUtils.h"
#include "nsSVGTextFrame.h"
#include "nsSVGOuterSVGFrame.h"
#include "nsSVGMatrix.h"

//----------------------------------------------------------------------
// Implementation

nsIFrame*
NS_NewSVGTSpanFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
  return new (aPresShell) nsSVGTSpanFrame(aContext);
}

nsIAtom *
nsSVGTSpanFrame::GetType() const
{
  return nsGkAtoms::svgTSpanFrame;
}

//----------------------------------------------------------------------
// nsQueryFrame methods

NS_QUERYFRAME_HEAD(nsSVGTSpanFrame)
  NS_QUERYFRAME_ENTRY(nsISVGGlyphFragmentNode)
NS_QUERYFRAME_TAIL_INHERITING(nsSVGTSpanFrameBase)

//----------------------------------------------------------------------
// nsIFrame methods

#ifdef DEBUG
NS_IMETHODIMP
nsSVGTSpanFrame::Init(nsIContent* aContent,
                      nsIFrame* aParent,
                      nsIFrame* aPrevInFlow)
{
  NS_ASSERTION(aParent, "null parent");

  // Some of our subclasses have an aContent that's not a <svg:tspan> or are
  // allowed to be constructed even when there is no nsISVGTextContentMetrics
  // ancestor.  For example, nsSVGAFrame inherits from us but may have nothing
  // to do with text.
  if (GetType() == nsGkAtoms::svgTSpanFrame) {
    nsIFrame* ancestorFrame = nsSVGUtils::GetFirstNonAAncestorFrame(aParent);
    NS_ASSERTION(ancestorFrame, "Must have ancestor");

    nsISVGTextContentMetrics *metrics = do_QueryFrame(ancestorFrame);
    NS_ASSERTION(metrics,
                 "trying to construct an SVGTSpanFrame for an invalid "
                 "container");

    nsCOMPtr<nsIDOMSVGTSpanElement> tspan = do_QueryInterface(aContent);
    NS_ASSERTION(tspan, "Content is not an SVG tspan");
  }

  return nsSVGTSpanFrameBase::Init(aContent, aParent, aPrevInFlow);
}
#endif /* DEBUG */

NS_IMETHODIMP
nsSVGTSpanFrame::AttributeChanged(PRInt32         aNameSpaceID,
                                  nsIAtom*        aAttribute,
                                  PRInt32         aModType)
{
  if (aNameSpaceID == kNameSpaceID_None &&
      (aAttribute == nsGkAtoms::x ||
       aAttribute == nsGkAtoms::y ||
       aAttribute == nsGkAtoms::dx ||
       aAttribute == nsGkAtoms::dy)) {
    NotifyGlyphMetricsChange();
  }

  return NS_OK;
}

//----------------------------------------------------------------------
// nsSVGContainerFrame methods:

gfxMatrix
nsSVGTSpanFrame::GetCanvasTM()
{
  NS_ASSERTION(mParent, "null parent");
  return static_cast<nsSVGContainerFrame*>(mParent)->GetCanvasTM();  
}

//----------------------------------------------------------------------
// nsISVGGlyphFragmentNode methods:

NS_IMETHODIMP_(PRUint32)
nsSVGTSpanFrame::GetNumberOfChars()
{
  return nsSVGTSpanFrameBase::GetNumberOfChars();
}

NS_IMETHODIMP_(float)
nsSVGTSpanFrame::GetComputedTextLength()
{
  return nsSVGTSpanFrameBase::GetComputedTextLength();
}

NS_IMETHODIMP_(float)
nsSVGTSpanFrame::GetSubStringLength(PRUint32 charnum, PRUint32 nchars)
{
  return nsSVGTSpanFrameBase::GetSubStringLengthNoValidation(charnum, nchars);
}

NS_IMETHODIMP_(PRInt32)
nsSVGTSpanFrame::GetCharNumAtPosition(nsIDOMSVGPoint *point)
{
  return nsSVGTSpanFrameBase::GetCharNumAtPosition(point);
}

NS_IMETHODIMP_(nsISVGGlyphFragmentLeaf *)
nsSVGTSpanFrame::GetFirstGlyphFragment()
{
  // try children first:
  nsIFrame* kid = mFrames.FirstChild();
  while (kid) {
    nsISVGGlyphFragmentNode *node = do_QueryFrame(kid);
    if (node)
      return node->GetFirstGlyphFragment();
    kid = kid->GetNextSibling();
  }

  // nope. try siblings:
  return GetNextGlyphFragment();

}

NS_IMETHODIMP_(nsISVGGlyphFragmentLeaf *)
nsSVGTSpanFrame::GetNextGlyphFragment()
{
  nsIFrame* sibling = mNextSibling;
  while (sibling) {
    nsISVGGlyphFragmentNode *node = do_QueryFrame(sibling);
    if (node)
      return node->GetFirstGlyphFragment();
    sibling = sibling->GetNextSibling();
  }

  // no more siblings. go back up the tree.
  
  NS_ASSERTION(mParent, "null parent");
  nsISVGGlyphFragmentNode *node = do_QueryFrame(mParent);
  return node ? node->GetNextGlyphFragment() : nsnull;
}

NS_IMETHODIMP_(void)
nsSVGTSpanFrame::SetWhitespaceHandling(PRUint8 aWhitespaceHandling)
{
  nsSVGTSpanFrameBase::SetWhitespaceHandling();
}