pjs/layout/generic/nsPageContentFrame.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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#include "nsPageContentFrame.h"
#include "nsHTMLParts.h"
#include "nsIContent.h"
#include "nsPresContext.h"
#include "nsIRenderingContext.h"
#include "nsHTMLAtoms.h"
#include "nsLayoutAtoms.h"
#include "nsIPresShell.h"
#include "nsIDeviceContext.h"
#include "nsReadableUtils.h"
#include "nsSimplePageSequence.h"
#include "nsDisplayList.h"

#include "nsIView.h"

#if defined(DEBUG_rods) || defined(DEBUG_dcone)
//#define DEBUG_PRINTING
#endif


nsIFrame*
NS_NewPageContentFrame(nsIPresShell* aPresShell)
{
  return new (aPresShell) nsPageContentFrame;
}

nsPageContentFrame::nsPageContentFrame() :
  mClipRect(-1, -1, -1, -1)
{
}

NS_IMETHODIMP nsPageContentFrame::Reflow(nsPresContext*   aPresContext,
                                  nsHTMLReflowMetrics&     aDesiredSize,
                                  const nsHTMLReflowState& aReflowState,
                                  nsReflowStatus&          aStatus)
{
  DO_GLOBAL_REFLOW_COUNT("nsPageContentFrame", aReflowState.reason);
  DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
  aStatus = NS_FRAME_COMPLETE;  // initialize out parameter

  if (eReflowReason_Incremental != aReflowState.reason) {
    // Resize our frame allowing it only to be as big as we are
    // XXX Pay attention to the page's border and padding...
    if (mFrames.NotEmpty()) {
      nsIFrame* frame = mFrames.FirstChild();
      nsSize  maxSize(aReflowState.availableWidth, aReflowState.availableHeight);
      nsHTMLReflowState kidReflowState(aPresContext, aReflowState, frame, maxSize);

      mPD->mPageContentSize  = aReflowState.availableWidth;

      // Reflow the page content area to get the child's desired size
      ReflowChild(frame, aPresContext, aDesiredSize, kidReflowState, 0, 0, 0, aStatus);

      // The document element's background should cover the entire canvas, so
      // take into account the combined area and any space taken up by
      // absolutely positioned elements
      nsMargin padding(0,0,0,0);

      // XXXbz this screws up percentage padding (sets padding to zero
      // in the percentage padding case)
      kidReflowState.mStylePadding->GetPadding(padding);

      // First check the combined area
      if (NS_FRAME_OUTSIDE_CHILDREN & frame->GetStateBits()) {
        // The background covers the content area and padding area, so check
        // for children sticking outside the child frame's padding edge
        if (aDesiredSize.mOverflowArea.XMost() > aDesiredSize.width) {
          mPD->mPageContentXMost =
            aDesiredSize.mOverflowArea.XMost() +
            kidReflowState.mStyleBorder->GetBorderWidth(NS_SIDE_RIGHT) +
            padding.right;
        }
      }

      // Place and size the child
      FinishReflowChild(frame, aPresContext, &kidReflowState, aDesiredSize, 0, 0, 0);

      NS_ASSERTION(!NS_FRAME_IS_COMPLETE(aStatus) ||
                   !frame->GetNextInFlow(), "bad child flow list");

#ifdef DEBUG_PRINTING
      nsRect r = frame->GetRect();
      printf("PCF: Area Frame %p Bounds: %5d,%5d,%5d,%5d\n", frame, r.x, r.y, r.width, r.height);
      nsIView* view = frame->GetView();
      if (view) {
        r = view->GetBounds();
        printf("PCF: Area Frame View Bounds: %5d,%5d,%5d,%5d\n", r.x, r.y, r.width, r.height);
      } else {
        printf("PCF: Area Frame View Bounds: NO VIEW\n");
      }
#endif
    }
    // Reflow our fixed frames 
    mFixedContainer.Reflow(this, aPresContext, aReflowState, aReflowState.availableWidth, 
                           aReflowState.availableHeight);

    // Return our desired size
    aDesiredSize.width = aReflowState.availableWidth;
    if (aReflowState.availableHeight != NS_UNCONSTRAINEDSIZE) {
      aDesiredSize.height = aReflowState.availableHeight;
    }
  }

  NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
  return NS_OK;
}

nsIAtom*
nsPageContentFrame::GetType() const
{
  return nsLayoutAtoms::pageContentFrame; 
}

#ifdef DEBUG
NS_IMETHODIMP
nsPageContentFrame::GetFrameName(nsAString& aResult) const
{
  return MakeFrameName(NS_LITERAL_STRING("PageContent"), aResult);
}
#endif

/* virtual */ PRBool
nsPageContentFrame::IsContainingBlock() const
{
  return PR_TRUE;
}


//------------------------------------------------------------------------------
NS_IMETHODIMP
nsPageContentFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                     const nsRect&           aDirtyRect,
                                     const nsDisplayListSet& aLists)
{
  nsRect rect;
  if (mClipRect.width != -1 || mClipRect.height != -1) {
    rect = mClipRect;
  } else {
    rect = mRect;
    rect.x = 0;
    rect.y = 0;
  }

  nsDisplayListCollection set;
  nsresult rv = nsContainerFrame::BuildDisplayList(aBuilder, aDirtyRect, set);
  NS_ENSURE_SUCCESS(rv, rv);

  return Clip(aBuilder, set, aLists, rect);
}