layout/generic/nsHTMLCanvasFrame.h

   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 /* rendering object for the HTML <canvas> element */
   7
   8 #ifndef nsHTMLCanvasFrame_h___
   9 #define nsHTMLCanvasFrame_h___
  10
  11 #include "mozilla/Attributes.h"
  12 #include "nsContainerFrame.h"
  13 #include "FrameLayerBuilder.h"
  14
  15 namespace mozilla {
  16 namespace layers {
  17 class Layer;
  18 class LayerManager;
  19 }
  20 }
  21
  22 class nsPresContext;
  23 class nsDisplayItem;
  24 class nsAString;
  25
  26 nsIFrame* NS_NewHTMLCanvasFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
  27
  28 class nsHTMLCanvasFrame : public nsContainerFrame
  29 {
  30 public:
  31   typedef mozilla::layers::Layer Layer;
  32   typedef mozilla::layers::LayerManager LayerManager;
  33   typedef mozilla::ContainerLayerParameters ContainerLayerParameters;
  34
  35   NS_DECL_QUERYFRAME_TARGET(nsHTMLCanvasFrame)
  36   NS_DECL_QUERYFRAME
  37   NS_DECL_FRAMEARENA_HELPERS
  38
  39   explicit nsHTMLCanvasFrame(nsStyleContext* aContext)
  40   : nsContainerFrame(aContext)
  41     , mBorderPadding(GetWritingMode()) {}
  42
  43   virtual void Init(nsIContent*       aContent,
  44                     nsContainerFrame* aParent,
  45                     nsIFrame*         aPrevInFlow) MOZ_OVERRIDE;
  46
  47   virtual void BuildDisplayList(nsDisplayListBuilder*   aBuilder,
  48                                 const nsRect&           aDirtyRect,
  49                                 const nsDisplayListSet& aLists) MOZ_OVERRIDE;
  50
  51   already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
  52                                      LayerManager* aManager,
  53                                      nsDisplayItem* aItem,
  54                                      const ContainerLayerParameters& aContainerParameters);
  55
  56   /* get the size of the canvas's image */
  57   nsIntSize GetCanvasSize();
  58
  59   virtual nscoord GetMinISize(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE;
  60   virtual nscoord GetPrefISize(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE;
  61   virtual nsSize GetIntrinsicRatio() MOZ_OVERRIDE;
  62
  63   virtual mozilla::LogicalSize
  64   ComputeSize(nsRenderingContext *aRenderingContext,
  65               mozilla::WritingMode aWritingMode,
  66               const mozilla::LogicalSize& aCBSize,
  67               nscoord aAvailableISize,
  68               const mozilla::LogicalSize& aMargin,
  69               const mozilla::LogicalSize& aBorder,
  70               const mozilla::LogicalSize& aPadding,
  71               uint32_t aFlags) MOZ_OVERRIDE;
  72
  73   virtual void Reflow(nsPresContext*           aPresContext,
  74                       nsHTMLReflowMetrics&     aDesiredSize,
  75                       const nsHTMLReflowState& aReflowState,
  76                       nsReflowStatus&          aStatus) MOZ_OVERRIDE;
  77
  78   nsRect GetInnerArea() const;
  79
  80 #ifdef ACCESSIBILITY
  81   virtual mozilla::a11y::AccType AccessibleType() MOZ_OVERRIDE;
  82 #endif
  83
  84   virtual nsIAtom* GetType() const MOZ_OVERRIDE;
  85
  86   virtual bool IsFrameOfType(uint32_t aFlags) const MOZ_OVERRIDE
  87   {
  88     return nsSplittableFrame::IsFrameOfType(aFlags & ~(nsIFrame::eReplaced));
  89   }
  90
  91 #ifdef DEBUG_FRAME_DUMP
  92   virtual nsresult GetFrameName(nsAString& aResult) const MOZ_OVERRIDE;
  93 #endif
  94
  95   // Inserted child content gets its frames parented by our child block
  96   virtual nsContainerFrame* GetContentInsertionFrame() MOZ_OVERRIDE {
  97     return GetFirstPrincipalChild()->GetContentInsertionFrame();
  98   }
  99
 100 protected:
 101   virtual ~nsHTMLCanvasFrame();
 102
 103   nscoord GetContinuationOffset(nscoord* aWidth = 0) const;
 104
 105   mozilla::LogicalMargin mBorderPadding;
 106 };
 107
 108 #endif /* nsHTMLCanvasFrame_h___ */