layout/generic/nsViewportFrame.h

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  37
  38 /*
  39  * rendering object that is the root of the frame tree, which contains
  40  * the document's scrollbars and contains fixed-positioned elements
  41  */
  42
  43 #ifndef nsViewportFrame_h___
  44 #define nsViewportFrame_h___
  45
  46 #include "nsContainerFrame.h"
  47 #include "nsGkAtoms.h"
  48 #include "nsPresContext.h"
  49 #include "nsIPresShell.h"
  50 #include "nsAbsoluteContainingBlock.h"
  51
  52 /**
  53   * ViewportFrame is the parent of a single child - the doc root frame or a scroll frame
  54   * containing the doc root frame. ViewportFrame stores this child in its primary child
  55   * list. It stores fixed positioned items in a secondary child list and its mFixedContainer
  56   * delegate handles them.
  57   */
  58 class ViewportFrame : public nsContainerFrame {
  59 public:
  60   typedef nsContainerFrame Super;
  61
  62   ViewportFrame(nsStyleContext* aContext)
  63     : nsContainerFrame(aContext)
  64     , mFixedContainer(nsGkAtoms::fixedList)
  65   {}
  66   virtual ~ViewportFrame() { } // useful for debugging
  67
  68   virtual void Destroy();
  69
  70   NS_IMETHOD Init(nsIContent*      aContent,
  71                   nsIFrame*        aParent,
  72                   nsIFrame*        asPrevInFlow);
  73
  74   NS_IMETHOD SetInitialChildList(nsIAtom*        aListName,
  75                                  nsIFrame*       aChildList);
  76
  77   NS_IMETHOD AppendFrames(nsIAtom*        aListName,
  78                           nsIFrame*       aFrameList);
  79
  80   NS_IMETHOD InsertFrames(nsIAtom*        aListName,
  81                           nsIFrame*       aPrevFrame,
  82                           nsIFrame*       aFrameList);
  83
  84   NS_IMETHOD RemoveFrame(nsIAtom*        aListName,
  85                          nsIFrame*       aOldFrame);
  86
  87   virtual nsIAtom* GetAdditionalChildListName(PRInt32 aIndex) const;
  88
  89   virtual nsIFrame* GetFirstChild(nsIAtom* aListName) const;
  90
  91   NS_IMETHOD BuildDisplayList(nsDisplayListBuilder*   aBuilder,
  92                               const nsRect&           aDirtyRect,
  93                               const nsDisplayListSet& aLists);
  94
  95   virtual nscoord GetMinWidth(nsIRenderingContext *aRenderingContext);
  96   virtual nscoord GetPrefWidth(nsIRenderingContext *aRenderingContext);
  97   NS_IMETHOD Reflow(nsPresContext*          aPresContext,
  98                     nsHTMLReflowMetrics&     aDesiredSize,
  99                     const nsHTMLReflowState& aReflowState,
 100                     nsReflowStatus&          aStatus);
 101
 102   /**
 103    * Get the "type" of the frame
 104    *
 105    * @see nsGkAtoms::viewportFrame
 106    */
 107   virtual nsIAtom* GetType() const;
 108
 109   virtual PRBool IsContainingBlock() const;
 110
 111   virtual void InvalidateInternal(const nsRect& aDamageRect,
 112                                   nscoord aX, nscoord aY, nsIFrame* aForChild,
 113                                   PRUint32 aFlags);
 114
 115 #ifdef DEBUG
 116   NS_IMETHOD GetFrameName(nsAString& aResult) const;
 117 #endif
 118
 119 protected:
 120   nsPoint AdjustReflowStateForScrollbars(nsHTMLReflowState* aReflowState) const;
 121
 122 protected:
 123   // position: fixed content is really content which is absolutely positioned with
 124   // respect to the viewport.
 125   nsAbsoluteContainingBlock mFixedContainer;
 126 };
 127
 128
 129 #endif // nsViewportFrame_h___