gecko/layout/svg/base/src/nsSVGSwitchFrame.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
 * Robert Longson
 * Portions created by the Initial Developer are Copyright (C) 2007
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Robert Longson <longsonr@gmail.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 ***** */

// Keep in (case-insensitive) order:
#include "gfxMatrix.h"
#include "gfxRect.h"
#include "nsSVGGFrame.h"
#include "nsSVGSwitchElement.h"
#include "nsSVGUtils.h"

class nsRenderingContext;

typedef nsSVGGFrame nsSVGSwitchFrameBase;

class nsSVGSwitchFrame : public nsSVGSwitchFrameBase
{
  friend nsIFrame*
  NS_NewSVGSwitchFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
protected:
  nsSVGSwitchFrame(nsStyleContext* aContext) :
    nsSVGSwitchFrameBase(aContext) {}

public:
  NS_DECL_FRAMEARENA_HELPERS

#ifdef DEBUG
  NS_IMETHOD Init(nsIContent*      aContent,
                  nsIFrame*        aParent,
                  nsIFrame*        aPrevInFlow);
#endif

  /**
   * Get the "type" of the frame
   *
   * @see nsGkAtoms::svgSwitchFrame
   */
  virtual nsIAtom* GetType() const;

#ifdef DEBUG
  NS_IMETHOD GetFrameName(nsAString& aResult) const
  {
    return MakeFrameName(NS_LITERAL_STRING("SVGSwitch"), aResult);
  }
#endif

  // nsISVGChildFrame interface:
  NS_IMETHOD PaintSVG(nsRenderingContext* aContext, const nsIntRect *aDirtyRect);
  NS_IMETHODIMP_(nsIFrame*) GetFrameForPoint(const nsPoint &aPoint);
  NS_IMETHODIMP_(nsRect) GetCoveredRegion();
  virtual gfxRect GetBBoxContribution(const gfxMatrix &aToBBoxUserspace,
                                      PRUint32 aFlags);

private:
  nsIFrame *GetActiveChildFrame();
};

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

nsIFrame*
NS_NewSVGSwitchFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{  
  return new (aPresShell) nsSVGSwitchFrame(aContext);
}

NS_IMPL_FRAMEARENA_HELPERS(nsSVGSwitchFrame)

#ifdef DEBUG
NS_IMETHODIMP
nsSVGSwitchFrame::Init(nsIContent* aContent,
                       nsIFrame* aParent,
                       nsIFrame* aPrevInFlow)
{
  nsCOMPtr<nsIDOMSVGSwitchElement> svgSwitch = do_QueryInterface(aContent);
  NS_ASSERTION(svgSwitch, "Content is not an SVG switch\n");

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

nsIAtom *
nsSVGSwitchFrame::GetType() const
{
  return nsGkAtoms::svgSwitchFrame;
}

NS_IMETHODIMP
nsSVGSwitchFrame::PaintSVG(nsRenderingContext* aContext,
                           const nsIntRect *aDirtyRect)
{
  const nsStyleDisplay *display = mStyleContext->GetStyleDisplay();
  if (display->mOpacity == 0.0)
    return NS_OK;

  nsIFrame *kid = GetActiveChildFrame();
  if (kid) {
    nsSVGUtils::PaintFrameWithEffects(aContext, aDirtyRect, kid);
  }
  return NS_OK;
}


NS_IMETHODIMP_(nsIFrame*)
nsSVGSwitchFrame::GetFrameForPoint(const nsPoint &aPoint)
{
  nsIFrame *kid = GetActiveChildFrame();
  if (kid) {
    nsISVGChildFrame* svgFrame = do_QueryFrame(kid);
    if (svgFrame) {
      return svgFrame->GetFrameForPoint(aPoint);
    }
  }

  return nsnull;
}

NS_IMETHODIMP_(nsRect)
nsSVGSwitchFrame::GetCoveredRegion()
{
  nsRect rect;

  nsIFrame *kid = GetActiveChildFrame();
  if (kid) {
    nsISVGChildFrame* child = do_QueryFrame(kid);
    if (child) {
      rect = child->GetCoveredRegion();
    }
  }
  return rect;
}

gfxRect
nsSVGSwitchFrame::GetBBoxContribution(const gfxMatrix &aToBBoxUserspace,
                                      PRUint32 aFlags)
{
  nsIFrame* kid = GetActiveChildFrame();
  nsISVGChildFrame* svgKid = do_QueryFrame(kid);
  if (svgKid) {
    nsIContent *content = kid->GetContent();
    gfxMatrix transform = aToBBoxUserspace;
    if (content->IsSVG()) {
      transform = static_cast<nsSVGElement*>(content)->
                    PrependLocalTransformsTo(aToBBoxUserspace);
    }
    return svgKid->GetBBoxContribution(transform, aFlags);
  }
  return gfxRect(0.0, 0.0, 0.0, 0.0);
}

nsIFrame *
nsSVGSwitchFrame::GetActiveChildFrame()
{
  nsIContent *activeChild =
    static_cast<nsSVGSwitchElement*>(mContent)->GetActiveChild();

  if (activeChild) {
    for (nsIFrame* kid = mFrames.FirstChild(); kid;
         kid = kid->GetNextSibling()) {

      if (activeChild == kid->GetContent()) {
        return kid;
      }
    }
  }
  return nsnull;
}