gecko-dev/layout/svg/base/src/nsSVGGFrame.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) 2001
 * 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 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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 * ***** END LICENSE BLOCK ***** */

#include "nsIDOMSVGTransformable.h"
#include "nsSVGGFrame.h"
#include "nsIFrame.h"
#include "nsSVGMatrix.h"
#include "nsSVGClipPathFrame.h"
#include "nsLayoutAtoms.h"
#include "nsSVGUtils.h"
#include "nsISVGValueUtils.h"
#include "nsSVGGraphicElement.h"

NS_INTERFACE_MAP_BEGIN(nsSVGGFrame)
  NS_INTERFACE_MAP_ENTRY(nsISVGValueObserver)
  NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
NS_INTERFACE_MAP_END_INHERITING(nsSVGDisplayContainerFrame)

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

nsIFrame*
NS_NewSVGGFrame(nsIPresShell* aPresShell, nsIContent* aContent, nsStyleContext* aContext)
{  
  nsCOMPtr<nsIDOMSVGTransformable> transformable = do_QueryInterface(aContent);
  if (!transformable) {
#ifdef DEBUG
    printf("warning: trying to construct an SVGGFrame for a content element that doesn't support the right interfaces\n");
#endif
    return nsnull;
  }

  return new (aPresShell) nsSVGGFrame(aContext);
}

nsIAtom *
nsSVGGFrame::GetType() const
{
  return nsGkAtoms::svgGFrame;
}

//----------------------------------------------------------------------
// nsISVGChildFrame methods

NS_IMETHODIMP
nsSVGGFrame::NotifyCanvasTMChanged(PRBool suppressInvalidation)
{
  // make sure our cached transform matrix gets (lazily) updated
  mCanvasTM = nsnull;

  return nsSVGGFrameBase::NotifyCanvasTMChanged(suppressInvalidation);
}

NS_IMETHODIMP
nsSVGGFrame::SetMatrixPropagation(PRBool aPropagate)
{
  mPropagateTransform = aPropagate;
  return NS_OK;
}

NS_IMETHODIMP
nsSVGGFrame::SetOverrideCTM(nsIDOMSVGMatrix *aCTM)
{
  mOverrideCTM = aCTM;
  return NS_OK;
}

already_AddRefed<nsIDOMSVGMatrix>
nsSVGGFrame::GetCanvasTM()
{
  if (!mPropagateTransform) {
    nsIDOMSVGMatrix *retval;
    if (mOverrideCTM) {
      retval = mOverrideCTM;
      NS_ADDREF(retval);
    } else {
      NS_NewSVGMatrix(&retval);
    }
    return retval;
  }

  if (!mCanvasTM) {
    // get our parent's tm and append local transforms (if any):
    NS_ASSERTION(mParent, "null parent");
    nsSVGContainerFrame *containerFrame = NS_STATIC_CAST(nsSVGContainerFrame*,
                                                         mParent);
    nsCOMPtr<nsIDOMSVGMatrix> parentTM = containerFrame->GetCanvasTM();
    NS_ASSERTION(parentTM, "null TM");

    // got the parent tm, now check for local tm:
    nsSVGGraphicElement *element =
      NS_STATIC_CAST(nsSVGGraphicElement*, mContent);
    nsCOMPtr<nsIDOMSVGMatrix> localTM = element->GetLocalTransformMatrix();

    if (localTM)
      parentTM->Multiply(localTM, getter_AddRefs(mCanvasTM));
    else
      mCanvasTM = parentTM;
  }

  nsIDOMSVGMatrix* retval = mCanvasTM.get();
  NS_IF_ADDREF(retval);
  return retval;
}

NS_IMETHODIMP
nsSVGGFrame::WillModifySVGObservable(nsISVGValue* observable,
                                     nsISVGValue::modificationType aModType)
{
  nsSVGUtils::WillModifyEffects(this, observable, aModType);
  return NS_OK;
}

NS_IMETHODIMP
nsSVGGFrame::DidModifySVGObservable(nsISVGValue* observable,
                                    nsISVGValue::modificationType aModType)
{
  nsSVGUtils::DidModifyEffects(this, observable, aModType);
  return NS_OK;
}

NS_IMETHODIMP
nsSVGGFrame::DidSetStyleContext()
{
  nsSVGUtils::StyleEffects(this);
  return NS_OK;
}

NS_IMETHODIMP
nsSVGGFrame::AttributeChanged(PRInt32         aNameSpaceID,
                              nsIAtom*        aAttribute,
                              PRInt32         aModType)
{
  if (aNameSpaceID == kNameSpaceID_None &&
      aAttribute == nsGkAtoms::transform) {
    // make sure our cached transform matrix gets (lazily) updated
    mCanvasTM = nsnull;

    for (nsIFrame* kid = mFrames.FirstChild(); kid;
         kid = kid->GetNextSibling()) {
      nsISVGChildFrame* SVGFrame = nsnull;
      CallQueryInterface(kid, &SVGFrame);
      if (SVGFrame)
        SVGFrame->NotifyCanvasTMChanged(PR_FALSE);
    }  
  }
  
  return NS_OK;
}