layout/svg/nsSVGUseFrame.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 // Keep in (case-insensitive) order:
   7 #include "nsIAnonymousContentCreator.h"
   8 #include "nsSVGEffects.h"
   9 #include "nsSVGGFrame.h"
  10 #include "mozilla/dom/SVGUseElement.h"
  11 #include "nsContentList.h"
  12
  13 typedef nsSVGGFrame nsSVGUseFrameBase;
  14
  15 using namespace mozilla::dom;
  16
  17 class nsSVGUseFrame : public nsSVGUseFrameBase,
  18                       public nsIAnonymousContentCreator
  19 {
  20   friend nsIFrame*
  21   NS_NewSVGUseFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
  22
  23 protected:
  24   explicit nsSVGUseFrame(nsStyleContext* aContext) :
  25     nsSVGUseFrameBase(aContext),
  26     mHasValidDimensions(true)
  27   {}
  28
  29 public:
  30   NS_DECL_QUERYFRAME
  31   NS_DECL_FRAMEARENA_HELPERS
  32
  33
  34   // nsIFrame interface:
  35   virtual void Init(nsIContent*       aContent,
  36                     nsContainerFrame* aParent,
  37                     nsIFrame*         aPrevInFlow) MOZ_OVERRIDE;
  38
  39   virtual nsresult  AttributeChanged(int32_t         aNameSpaceID,
  40                                      nsIAtom*        aAttribute,
  41                                      int32_t         aModType) MOZ_OVERRIDE;
  42
  43   virtual void DestroyFrom(nsIFrame* aDestructRoot) MOZ_OVERRIDE;
  44
  45   /**
  46    * Get the "type" of the frame
  47    *
  48    * @see nsGkAtoms::svgUseFrame
  49    */
  50   virtual nsIAtom* GetType() const MOZ_OVERRIDE;
  51
  52   virtual bool IsLeaf() const MOZ_OVERRIDE;
  53
  54 #ifdef DEBUG_FRAME_DUMP
  55   virtual nsresult GetFrameName(nsAString& aResult) const MOZ_OVERRIDE
  56   {
  57     return MakeFrameName(NS_LITERAL_STRING("SVGUse"), aResult);
  58   }
  59 #endif
  60
  61   // nsISVGChildFrame interface:
  62   virtual void ReflowSVG() MOZ_OVERRIDE;
  63   virtual void NotifySVGChanged(uint32_t aFlags) MOZ_OVERRIDE;
  64
  65   // nsIAnonymousContentCreator
  66   virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements) MOZ_OVERRIDE;
  67   virtual void AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,
  68                                         uint32_t aFilter) MOZ_OVERRIDE;
  69
  70 private:
  71   bool mHasValidDimensions;
  72 };
  73
  74 //----------------------------------------------------------------------
  75 // Implementation
  76
  77 nsIFrame*
  78 NS_NewSVGUseFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
  79 {
  80   return new (aPresShell) nsSVGUseFrame(aContext);
  81 }
  82
  83 NS_IMPL_FRAMEARENA_HELPERS(nsSVGUseFrame)
  84
  85 nsIAtom *
  86 nsSVGUseFrame::GetType() const
  87 {
  88   return nsGkAtoms::svgUseFrame;
  89 }
  90
  91 //----------------------------------------------------------------------
  92 // nsQueryFrame methods
  93
  94 NS_QUERYFRAME_HEAD(nsSVGUseFrame)
  95   NS_QUERYFRAME_ENTRY(nsIAnonymousContentCreator)
  96 NS_QUERYFRAME_TAIL_INHERITING(nsSVGUseFrameBase)
  97
  98 //----------------------------------------------------------------------
  99 // nsIFrame methods:
 100
 101 void
 102 nsSVGUseFrame::Init(nsIContent*       aContent,
 103                     nsContainerFrame* aParent,
 104                     nsIFrame*         aPrevInFlow)
 105 {
 106   NS_ASSERTION(aContent->IsSVG(nsGkAtoms::use),
 107                "Content is not an SVG use!");
 108
 109   mHasValidDimensions =
 110     static_cast<SVGUseElement*>(aContent)->HasValidDimensions();
 111
 112   nsSVGUseFrameBase::Init(aContent, aParent, aPrevInFlow);
 113 }
 114
 115 nsresult
 116 nsSVGUseFrame::AttributeChanged(int32_t         aNameSpaceID,
 117                                 nsIAtom*        aAttribute,
 118                                 int32_t         aModType)
 119 {
 120   SVGUseElement *useElement = static_cast<SVGUseElement*>(mContent);
 121
 122   if (aNameSpaceID == kNameSpaceID_None) {
 123     if (aAttribute == nsGkAtoms::x ||
 124         aAttribute == nsGkAtoms::y) {
 125       // make sure our cached transform matrix gets (lazily) updated
 126       mCanvasTM = nullptr;
 127       nsSVGEffects::InvalidateRenderingObservers(this);
 128       nsSVGUtils::ScheduleReflowSVG(this);
 129       nsSVGUtils::NotifyChildrenOfSVGChange(this, TRANSFORM_CHANGED);
 130     } else if (aAttribute == nsGkAtoms::width ||
 131                aAttribute == nsGkAtoms::height) {
 132       bool invalidate = false;
 133       if (mHasValidDimensions != useElement->HasValidDimensions()) {
 134         mHasValidDimensions = !mHasValidDimensions;
 135         invalidate = true;
 136       }
 137       if (useElement->OurWidthAndHeightAreUsed()) {
 138         invalidate = true;
 139         useElement->SyncWidthOrHeight(aAttribute);
 140       }
 141       if (invalidate) {
 142         nsSVGEffects::InvalidateRenderingObservers(this);
 143         nsSVGUtils::ScheduleReflowSVG(this);
 144       }
 145     }
 146   } else if (aNameSpaceID == kNameSpaceID_XLink &&
 147              aAttribute == nsGkAtoms::href) {
 148     // we're changing our nature, clear out the clone information
 149     nsSVGEffects::InvalidateRenderingObservers(this);
 150     nsSVGUtils::ScheduleReflowSVG(this);
 151     useElement->mOriginal = nullptr;
 152     useElement->UnlinkSource();
 153     useElement->TriggerReclone();
 154   }
 155
 156   return nsSVGUseFrameBase::AttributeChanged(aNameSpaceID,
 157                                              aAttribute, aModType);
 158 }
 159
 160 void
 161 nsSVGUseFrame::DestroyFrom(nsIFrame* aDestructRoot)
 162 {
 163   nsRefPtr<SVGUseElement> use = static_cast<SVGUseElement*>(mContent);
 164   nsSVGUseFrameBase::DestroyFrom(aDestructRoot);
 165   use->DestroyAnonymousContent();
 166 }
 167
 168 bool
 169 nsSVGUseFrame::IsLeaf() const
 170 {
 171   return true;
 172 }
 173
 174
 175 //----------------------------------------------------------------------
 176 // nsISVGChildFrame methods
 177
 178 void
 179 nsSVGUseFrame::ReflowSVG()
 180 {
 181   // We only handle x/y offset here, since any width/height that is in force is
 182   // handled by the nsSVGOuterSVGFrame for the anonymous <svg> that will be
 183   // created for that purpose.
 184   float x, y;
 185   static_cast<SVGUseElement*>(mContent)->
 186     GetAnimatedLengthValues(&x, &y, nullptr);
 187   mRect.MoveTo(nsLayoutUtils::RoundGfxRectToAppRect(
 188                  gfxRect(x, y, 0.0, 0.0),
 189                  PresContext()->AppUnitsPerCSSPixel()).TopLeft());
 190
 191   // If we have a filter, we need to invalidate ourselves because filter
 192   // output can change even if none of our descendants need repainting.
 193   if (StyleSVGReset()->HasFilters()) {
 194     InvalidateFrame();
 195   }
 196
 197   nsSVGUseFrameBase::ReflowSVG();
 198 }
 199
 200 void
 201 nsSVGUseFrame::NotifySVGChanged(uint32_t aFlags)
 202 {
 203   if (aFlags & COORD_CONTEXT_CHANGED &&
 204       !(aFlags & TRANSFORM_CHANGED)) {
 205     // Coordinate context changes affect mCanvasTM if we have a
 206     // percentage 'x' or 'y'
 207     SVGUseElement *use = static_cast<SVGUseElement*>(mContent);
 208     if (use->mLengthAttributes[SVGUseElement::ATTR_X].IsPercentage() ||
 209         use->mLengthAttributes[SVGUseElement::ATTR_Y].IsPercentage()) {
 210       aFlags |= TRANSFORM_CHANGED;
 211       // Ancestor changes can't affect how we render from the perspective of
 212       // any rendering observers that we may have, so we don't need to
 213       // invalidate them. We also don't need to invalidate ourself, since our
 214       // changed ancestor will have invalidated its entire area, which includes
 215       // our area.
 216       // For perf reasons we call this before calling NotifySVGChanged() below.
 217       nsSVGUtils::ScheduleReflowSVG(this);
 218     }
 219   }
 220
 221   // We don't remove the TRANSFORM_CHANGED flag here if we have a viewBox or
 222   // non-percentage width/height, since if they're set then they are cloned to
 223   // an anonymous child <svg>, and its nsSVGInnerSVGFrame will do that.
 224
 225   nsSVGUseFrameBase::NotifySVGChanged(aFlags);
 226 }
 227
 228 //----------------------------------------------------------------------
 229 // nsIAnonymousContentCreator methods:
 230
 231 nsresult
 232 nsSVGUseFrame::CreateAnonymousContent(nsTArray<ContentInfo>& aElements)
 233 {
 234   SVGUseElement *use = static_cast<SVGUseElement*>(mContent);
 235
 236   nsIContent* clone = use->CreateAnonymousContent();
 237   nsSVGEffects::InvalidateRenderingObservers(this);
 238   if (!clone)
 239     return NS_ERROR_FAILURE;
 240   if (!aElements.AppendElement(clone))
 241     return NS_ERROR_OUT_OF_MEMORY;
 242   return NS_OK;
 243 }
 244
 245 void
 246 nsSVGUseFrame::AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,
 247                                         uint32_t aFilter)
 248 {
 249   SVGUseElement *use = static_cast<SVGUseElement*>(mContent);
 250   nsIContent* clone = use->GetAnonymousContent();
 251   if (clone) {
 252     aElements.AppendElement(clone);
 253   }
 254 }