gecko-dev/layout/generic/nsLeafFrame.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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#include "nsCOMPtr.h"
#include "nsLeafFrame.h"
#include "nsHTMLContainerFrame.h"
#include "nsCSSRendering.h"
#include "nsHTMLParts.h"
#include "nsHTMLAtoms.h"
#include "nsIPresShell.h"
#include "nsIPresContext.h"
#include "nsIStyleContext.h"

nsLeafFrame::~nsLeafFrame()
{
}

NS_IMETHODIMP
nsLeafFrame::Paint(nsIPresContext*      aPresContext,
                   nsIRenderingContext& aRenderingContext,
                   const nsRect&        aDirtyRect,
                   nsFramePaintLayer    aWhichLayer,
                   PRUint32             aFlags)
{
  if (NS_FRAME_PAINT_LAYER_BACKGROUND == aWhichLayer) {
    PRBool isVisible;
    if (NS_SUCCEEDED(IsVisibleForPainting(aPresContext, aRenderingContext, PR_FALSE, &isVisible)) && 
                     !isVisible) {// just checks selection painting
      return NS_OK;               // not visibility
    }

    const nsStyleVisibility* vis = 
      (const nsStyleVisibility*)mStyleContext->GetStyleData(eStyleStruct_Visibility);
    
    if (vis->IsVisibleOrCollapsed()) {
      const nsStyleBorder* myBorder = (const nsStyleBorder*)
        mStyleContext->GetStyleData(eStyleStruct_Border);
      const nsStylePadding* myPadding = (const nsStylePadding*)
        mStyleContext->GetStyleData(eStyleStruct_Padding);
      const nsStyleOutline* myOutline = (const nsStyleOutline*)
        mStyleContext->GetStyleData(eStyleStruct_Outline);
      nsRect rect(0, 0, mRect.width, mRect.height);
      nsCSSRendering::PaintBackground(aPresContext, aRenderingContext, this,
                                      aDirtyRect, rect, *myBorder, *myPadding,
                                      0, 0);
      nsCSSRendering::PaintBorder(aPresContext, aRenderingContext, this,
                                  aDirtyRect, rect, *myBorder,
                                  mStyleContext, 0);
      nsCSSRendering::PaintOutline(aPresContext, aRenderingContext, this,
                                   aDirtyRect, rect, *myBorder,
                                   *myOutline, mStyleContext, 0);
    }
  }
  DO_GLOBAL_REFLOW_COUNT_DSP("nsLeafFrame", &aRenderingContext);
  return NS_OK;
}

NS_IMETHODIMP
nsLeafFrame::Reflow(nsIPresContext* aPresContext,
                    nsHTMLReflowMetrics& aMetrics,
                    const nsHTMLReflowState& aReflowState,
                    nsReflowStatus& aStatus)
{
  DO_GLOBAL_REFLOW_COUNT("nsLeafFrame", aReflowState.reason);
  NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
                 ("enter nsLeafFrame::Reflow: aMaxSize=%d,%d",
                  aReflowState.availableWidth, aReflowState.availableHeight));

  NS_PRECONDITION(mState & NS_FRAME_IN_REFLOW, "frame is not in reflow");

  // XXX add in code to check for width/height being set via css
  // and if set use them instead of calling GetDesiredSize.


  GetDesiredSize(aPresContext, aReflowState, aMetrics);
  nsMargin borderPadding;
  AddBordersAndPadding(aPresContext, aReflowState, aMetrics, borderPadding);
  if (nsnull != aMetrics.maxElementSize) {
    aMetrics.AddBorderPaddingToMaxElementSize(borderPadding);
    aMetrics.maxElementSize->width = aMetrics.width;
    aMetrics.maxElementSize->height = aMetrics.height;
  }
  aStatus = NS_FRAME_COMPLETE;

  NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
                 ("exit nsLeafFrame::Reflow: size=%d,%d",
                  aMetrics.width, aMetrics.height));
  NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aMetrics);
  return NS_OK;
}

// XXX how should border&padding effect baseline alignment?
// => descent = borderPadding.bottom for example
void
nsLeafFrame::AddBordersAndPadding(nsIPresContext* aPresContext,
                                  const nsHTMLReflowState& aReflowState,
                                  nsHTMLReflowMetrics& aMetrics,
                                  nsMargin& aBorderPadding)
{
  aBorderPadding = aReflowState.mComputedBorderPadding;
  aMetrics.width += aBorderPadding.left + aBorderPadding.right;
  aMetrics.height += aBorderPadding.top + aBorderPadding.bottom;
  aMetrics.ascent = aMetrics.height;
  aMetrics.descent = 0;
}

NS_IMETHODIMP
nsLeafFrame::ContentChanged(nsIPresContext* aPresContext,
                            nsIContent*     aChild,
                            nsISupports*    aSubContent)
{
    nsCOMPtr<nsIPresShell> shell;
    aPresContext->GetShell(getter_AddRefs(shell));
    mState |= NS_FRAME_IS_DIRTY;
    return mParent->ReflowDirtyChild(shell, this);
}

#ifdef DEBUG
NS_IMETHODIMP
nsLeafFrame::SizeOf(nsISizeOfHandler* aHandler,
                    PRUint32* aResult) const
{
  if (!aResult) {
    return NS_ERROR_NULL_POINTER;
  }
  *aResult = sizeof(*this);
  return NS_OK;
}
#endif