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/* base class #2 for rendering objects that have child lists */

#ifndef nsHTMLContainerFrame_h___
#define nsHTMLContainerFrame_h___

#include "nsContainerFrame.h"
#include "nsDisplayList.h"
#include "gfxPoint.h"

class nsString;
class nsAbsoluteFrame;
class nsPlaceholderFrame;
struct nsStyleDisplay;
struct nsStylePosition;
struct nsHTMLReflowMetrics;
struct nsHTMLReflowState;
class nsLineBox;

// Some macros for container classes to do sanity checking on
// width/height/x/y values computed during reflow.
// NOTE: AppUnitsPerCSSPixel value hardwired here to remove the
// dependency on nsDeviceContext.h.  It doesn't matter if it's a
// little off.
#ifdef DEBUG
#define CRAZY_W (1000000*60)
#define CRAZY_H CRAZY_W

#define CRAZY_WIDTH(_x) (((_x) < -CRAZY_W) || ((_x) > CRAZY_W))
#define CRAZY_HEIGHT(_y) (((_y) < -CRAZY_H) || ((_y) > CRAZY_H))
#endif

// Base class for html container frames that provides common
// functionality.
class nsHTMLContainerFrame : public nsContainerFrame {
public:
  NS_DECL_FRAMEARENA_HELPERS

  /**
   * Helper method to create next-in-flows if necessary. If aFrame
   * already has a next-in-flow then this method does
   * nothing. Otherwise, a new continuation frame is created and
   * linked into the flow. In addition, the new frame is inserted
   * into the principal child list after aFrame.
   * @note calling this method on a block frame is illegal. Use
   * nsBlockFrame::CreateContinuationFor() instead.
   * @param aNextInFlowResult will contain the next-in-flow
   *        <b>if and only if</b> one is created. If a next-in-flow already
   *        exists aNextInFlowResult is set to nsnull.
   * @return NS_OK if a next-in-flow already exists or is successfully created.
   */
  nsresult CreateNextInFlow(nsPresContext* aPresContext,
                            nsIFrame*       aFrame,
                            nsIFrame*&      aNextInFlowResult);

  /**
   * Displays the standard border, background and outline for the frame
   * and calls DisplayTextDecorationsAndChildren. This is suitable for
   * inline frames or frames that behave like inlines.
   */
  NS_IMETHOD BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                              const nsRect&           aDirtyRect,
                              const nsDisplayListSet& aLists);

protected:
  nsHTMLContainerFrame(nsStyleContext *aContext) : nsContainerFrame(aContext) {}
};

#endif /* nsHTMLContainerFrame_h___ */