gecko-dev/layout/svg/nsSVGStopFrame.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

// Keep in (case-insensitive) order:
#include "nsFrame.h"
#include "nsGkAtoms.h"
#include "nsIDOMSVGStopElement.h"
#include "nsStyleContext.h"
#include "nsSVGEffects.h"

// This is a very simple frame whose only purpose is to capture style change
// events and propagate them to the parent.  Most of the heavy lifting is done
// within the nsSVGGradientFrame, which is the parent for this frame

typedef nsFrame  nsSVGStopFrameBase;

class nsSVGStopFrame : public nsSVGStopFrameBase
{
  friend nsIFrame*
  NS_NewSVGStopFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
protected:
  nsSVGStopFrame(nsStyleContext* aContext) : nsSVGStopFrameBase(aContext) {}

public:
  NS_DECL_FRAMEARENA_HELPERS

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

  NS_IMETHOD BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                              const nsRect&           aDirtyRect,
                              const nsDisplayListSet& aLists) {
    return NS_OK;
  }

  virtual void DidSetStyleContext(nsStyleContext* aOldStyleContext);

  NS_IMETHOD AttributeChanged(int32_t         aNameSpaceID,
                              nsIAtom*        aAttribute,
                              int32_t         aModType);

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

  virtual bool IsFrameOfType(uint32_t aFlags) const
  {
    return nsSVGStopFrameBase::IsFrameOfType(aFlags & ~(nsIFrame::eSVG));
  }

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

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

NS_IMPL_FRAMEARENA_HELPERS(nsSVGStopFrame)

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

#ifdef DEBUG
NS_IMETHODIMP
nsSVGStopFrame::Init(nsIContent* aContent,
                     nsIFrame* aParent,
                     nsIFrame* aPrevInFlow)
{
  nsCOMPtr<nsIDOMSVGStopElement> grad = do_QueryInterface(aContent);
  NS_ASSERTION(grad, "Content doesn't support nsIDOMSVGStopElement");

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

/* virtual */ void
nsSVGStopFrame::DidSetStyleContext(nsStyleContext* aOldStyleContext)
{
  nsSVGStopFrameBase::DidSetStyleContext(aOldStyleContext);
  nsSVGEffects::InvalidateRenderingObservers(this);
}

nsIAtom *
nsSVGStopFrame::GetType() const
{
  return nsGkAtoms::svgStopFrame;
}

NS_IMETHODIMP
nsSVGStopFrame::AttributeChanged(int32_t         aNameSpaceID,
                                 nsIAtom*        aAttribute,
                                 int32_t         aModType)
{
  if (aNameSpaceID == kNameSpaceID_None &&
      aAttribute == nsGkAtoms::offset) {
    nsSVGEffects::InvalidateRenderingObservers(this);
  }

  return nsSVGStopFrameBase::AttributeChanged(aNameSpaceID,
                                              aAttribute, aModType);
}

// -------------------------------------------------------------------------
// Public functions
// -------------------------------------------------------------------------

nsIFrame* NS_NewSVGStopFrame(nsIPresShell*   aPresShell,
                             nsStyleContext* aContext)
{
  return new (aPresShell) nsSVGStopFrame(aContext);
}