gecko-dev/layout/generic/nsObjectFrame.h

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/* rendering objects for replaced elements implemented by a plugin */

#ifndef nsObjectFrame_h___
#define nsObjectFrame_h___

#ifdef XP_WIN
#include <windows.h>
#endif

#include "nsIObjectFrame.h"
#include "nsFrame.h"

#ifdef ACCESSIBILITY
class nsIAccessible;
#endif

class nsPluginInstanceOwner;
class nsIPluginHost;
class nsIPluginInstance;
class nsPresContext;

#define nsObjectFrameSuper nsFrame

class nsObjectFrame : public nsObjectFrameSuper, public nsIObjectFrame {
public:
  friend nsIFrame* NS_NewObjectFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);

  // nsISupports 
  NS_IMETHOD QueryInterface(const nsIID& aIID, void** aInstancePtr);

  NS_IMETHOD Init(nsIContent* aContent,
                  nsIFrame* aParent,
                  nsIFrame* aPrevInFlow);
  virtual nscoord GetMinWidth(nsIRenderingContext *aRenderingContext);
  virtual nscoord GetPrefWidth(nsIRenderingContext *aRenderingContext);
  NS_IMETHOD Reflow(nsPresContext* aPresContext,
                    nsHTMLReflowMetrics& aDesiredSize,
                    const nsHTMLReflowState& aReflowState,
                    nsReflowStatus& aStatus);
  NS_IMETHOD DidReflow(nsPresContext* aPresContext,
                       const nsHTMLReflowState* aReflowState,
                       nsDidReflowStatus aStatus);
  NS_IMETHOD BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                              const nsRect&           aDirtyRect,
                              const nsDisplayListSet& aLists);

  NS_IMETHOD  HandleEvent(nsPresContext* aPresContext,
                          nsGUIEvent* aEvent,
                          nsEventStatus* aEventStatus);

  virtual nsIAtom* GetType() const;

  virtual PRBool IsFrameOfType(PRUint32 aFlags) const
  {
    return nsObjectFrameSuper::IsFrameOfType(aFlags & ~(nsIFrame::eReplaced));
  }

  virtual PRBool SupportsVisibilityHidden() { return PR_FALSE; }
  virtual PRBool NeedsView() { return PR_TRUE; }
  virtual nsresult CreateWidgetForView(nsIView* aView);

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

  virtual void Destroy();

  virtual void DidSetStyleContext(nsStyleContext* aOldStyleContext);

  NS_IMETHOD GetPluginInstance(nsIPluginInstance*& aPluginInstance);
  virtual nsresult Instantiate(nsIChannel* aChannel, nsIStreamListener** aStreamListener);
  virtual nsresult Instantiate(const char* aMimeType, nsIURI* aURI);
  virtual void TryNotifyContentObjectWrapper();
  virtual void StopPlugin();

  /*
   * Stop a plugin instance. If aDelayedStop is true, the plugin will
   * be stopped at a later point when it's safe to do so (i.e. not
   * while destroying the frame tree). Delayed stopping is only
   * implemented on Win32 for now.
   */
  void StopPluginInternal(PRBool aDelayedStop);

  /* fail on any requests to get a cursor from us because plugins set their own! see bug 118877 */
  NS_IMETHOD GetCursor(const nsPoint& aPoint, nsIFrame::Cursor& aCursor) 
  {
    return NS_ERROR_NOT_IMPLEMENTED;
  }

  // accessibility support
#ifdef ACCESSIBILITY
  NS_IMETHOD GetAccessible(nsIAccessible** aAccessible);
#ifdef XP_WIN
  NS_IMETHOD GetPluginPort(HWND *aPort);
#endif
#endif

  //local methods
  nsresult CreateWidget(nscoord aWidth, nscoord aHeight, PRBool aViewOnly);

  // for a given aRoot, this walks the frame tree looking for the next outFrame
  static nsIObjectFrame* GetNextObjectFrame(nsPresContext* aPresContext,
                                            nsIFrame* aRoot);

protected:
  // nsISupports
  NS_IMETHOD_(nsrefcnt) AddRef(void);
  NS_IMETHOD_(nsrefcnt) Release(void);

  nsObjectFrame(nsStyleContext* aContext);
  virtual ~nsObjectFrame();

  // NOTE:  This frame class does not inherit from |nsLeafFrame|, so
  // this is not a virtual method implementation.
  void GetDesiredSize(nsPresContext* aPresContext,
                      const nsHTMLReflowState& aReflowState,
                      nsHTMLReflowMetrics& aDesiredSize);

  nsresult InstantiatePlugin(nsIPluginHost* aPluginHost, 
                             const char* aMimetype,
                             nsIURI* aURL);

  /**
   * Adjust the plugin's idea of its size, using aSize as its new size.
   * (aSize must be in twips)
   */
  void FixupWindow(const nsSize& aSize);

  /**
   * Sets up the plugin window and calls SetWindow on the plugin.
   */
  void CallSetWindow();

  PRBool IsFocusable(PRInt32 *aTabIndex = nsnull, PRBool aWithMouse = PR_FALSE);

  // check attributes and optionally CSS to see if we should display anything
  PRBool IsHidden(PRBool aCheckVisibilityStyle = PR_TRUE) const;

  void NotifyContentObjectWrapper();

  nsPoint GetWindowOriginInPixels(PRBool aWindowless);

  static void PaintPrintPlugin(nsIFrame* aFrame,
                               nsIRenderingContext* aRenderingContext,
                               const nsRect& aDirtyRect, nsPoint aPt);
  static void PaintPlugin(nsIFrame* aFrame,
                               nsIRenderingContext* aRenderingContext,
                               const nsRect& aDirtyRect, nsPoint aPt);
  void PrintPlugin(nsIRenderingContext& aRenderingContext,
                   const nsRect& aDirtyRect);
  void PaintPlugin(nsIRenderingContext& aRenderingContext,
                   const nsRect& aDirtyRect, const nsPoint& aFramePt);

  /**
   * Makes sure that mInstanceOwner is valid and without a current plugin
   * instance. Essentially, this prepares the frame to receive a new plugin.
   */
  NS_HIDDEN_(nsresult) PrepareInstanceOwner();

  friend class nsPluginInstanceOwner;
private:
  nsRefPtr<nsPluginInstanceOwner> mInstanceOwner;
  nsRect                mWindowlessRect;

  // For assertions that make it easier to determine if a crash is due
  // to the underlying problem described in bug 136927, and to prevent
  // reentry into instantiation.
  PRBool mPreventInstantiation;
};


#endif /* nsObjectFrame_h___ */