gecko-dev/layout/generic/nsVideoFrame.h

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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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 * 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
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 * The Original Code is Mozilla code.
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 * The Initial Developer of the Original Code is the Mozilla Corporation.
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 * Contributor(s):
 *  Chris Double <chris.double@double.co.nz>
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/* rendering object for the HTML <video> element */

#ifndef nsVideoFrame_h___
#define nsVideoFrame_h___

#include "nsContainerFrame.h"
#include "nsString.h"
#include "nsAString.h"
#include "nsIIOService.h"
#include "nsITimer.h"
#include "nsTArray.h"
#include "nsIAnonymousContentCreator.h"
#include "Layers.h"
#include "ImageLayers.h"

class nsPresContext;
class nsDisplayItem;

nsIFrame* NS_NewVideoFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);

class nsVideoFrame : public nsContainerFrame, public nsIAnonymousContentCreator
{
public:
  typedef mozilla::layers::Layer Layer;
  typedef mozilla::layers::LayerManager LayerManager;

  nsVideoFrame(nsStyleContext* aContext);

  NS_DECL_QUERYFRAME
  NS_DECL_FRAMEARENA_HELPERS

  NS_IMETHOD BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                              const nsRect&           aDirtyRect,
                              const nsDisplayListSet& aLists);

  NS_IMETHOD AttributeChanged(PRInt32 aNameSpaceID,
                              nsIAtom* aAttribute,
                              PRInt32 aModType);

  /* get the size of the video's display */
  nsSize GetVideoIntrinsicSize(nsRenderingContext *aRenderingContext);
  virtual nsSize GetIntrinsicRatio();
  virtual nsSize ComputeSize(nsRenderingContext *aRenderingContext,
                             nsSize aCBSize, nscoord aAvailableWidth,
                             nsSize aMargin, nsSize aBorder, nsSize aPadding,
                             bool aShrinkWrap);
  virtual nscoord GetMinWidth(nsRenderingContext *aRenderingContext);
  virtual nscoord GetPrefWidth(nsRenderingContext *aRenderingContext);
  virtual void DestroyFrom(nsIFrame* aDestructRoot);
  virtual bool IsLeaf() const;

  NS_IMETHOD Reflow(nsPresContext*          aPresContext,
                    nsHTMLReflowMetrics&     aDesiredSize,
                    const nsHTMLReflowState& aReflowState,
                    nsReflowStatus&          aStatus);

#ifdef ACCESSIBILITY
  virtual already_AddRefed<nsAccessible> CreateAccessible();
#endif

  virtual nsIAtom* GetType() const;

  virtual bool IsFrameOfType(PRUint32 aFlags) const
  {
    return nsSplittableFrame::IsFrameOfType(aFlags & ~(nsIFrame::eReplaced));
  }
  
  virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements);
  virtual void AppendAnonymousContentTo(nsBaseContentList& aElements,
                                        PRUint32 aFilters);

  nsIContent* GetPosterImage() { return mPosterImage; }

  // Returns true if we should display the poster. Note that once we show
  // a video frame, the poster will never be displayed again.
  bool ShouldDisplayPoster();

#ifdef DEBUG
  NS_IMETHOD GetFrameName(nsAString& aResult) const;
#endif

  already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
                                     LayerManager* aManager,
                                     nsDisplayItem* aItem);

protected:

  // Returns true if we're rendering for a video element. We still create
  // nsVideoFrame to render controls for an audio element.
  bool HasVideoElement();

  // Returns true if there is video data to render. Can return false
  // when we're the frame for an audio element, or we've created a video
  // element for a media which is audio-only.
  bool HasVideoData();

  // Sets the mPosterImage's src attribute to be the video's poster attribute,
  // if we're the frame for a video element. Only call on frames for video
  // elements, not for frames for audio elements.
  nsresult UpdatePosterSource(bool aNotify);

  virtual ~nsVideoFrame();

  nsMargin mBorderPadding;
  
  // Anonymous child which is bound via XBL to the video controls.
  nsCOMPtr<nsIContent> mVideoControls;
  
  // Anonymous child which is the image element of the poster frame.
  nsCOMPtr<nsIContent> mPosterImage;
};

#endif /* nsVideoFrame_h___ */