pjs/layout/generic/nsAreaFrame.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * The contents of this file are subject to the Netscape Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/NPL/
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 * Contributor(s): 
 */
#include "nsAreaFrame.h"
#include "nsBlockBandData.h"
#include "nsIReflowCommand.h"
#include "nsIStyleContext.h"
#include "nsStyleConsts.h"
#include "nsIPresContext.h"
#include "nsIViewManager.h"
#include "nsSpaceManager.h"
#include "nsHTMLAtoms.h"
#include "nsIView.h"
#include "nsHTMLIIDs.h"
#include "nsHTMLValue.h"
#include "nsHTMLParts.h"
#include "nsLayoutAtoms.h"
#include "nsISizeOfHandler.h"

#undef NOISY_MAX_ELEMENT_SIZE
#undef NOISY_SPACEMANAGER
#undef NOISY_FINAL_SIZE

nsresult
NS_NewAreaFrame(nsIFrame** aNewFrame, PRUint32 aFlags)
{
  NS_PRECONDITION(aNewFrame, "null OUT ptr");
  if (nsnull == aNewFrame) {
    return NS_ERROR_NULL_POINTER;
  }
  nsAreaFrame* it = new nsAreaFrame;
  if (nsnull == it) {
    return NS_ERROR_OUT_OF_MEMORY;
  }
  it->SetFlags(aFlags);
  *aNewFrame = it;
  return NS_OK;
}

nsAreaFrame::nsAreaFrame()
{
}

/////////////////////////////////////////////////////////////////////////////
// nsISupports

NS_IMETHODIMP
nsAreaFrame::QueryInterface(const nsIID& aIID, void** aInstancePtr)
{
  if (NULL == aInstancePtr) {
    return NS_ERROR_NULL_POINTER;
  }
  if (aIID.Equals(kIAreaFrameIID)) {
    nsIAreaFrame* tmp = (nsIAreaFrame*)this;
    *aInstancePtr = (void*)tmp;
    return NS_OK;
  }
  return nsBlockFrame::QueryInterface(aIID, aInstancePtr);
}

/////////////////////////////////////////////////////////////////////////////
// nsIFrame

NS_IMETHODIMP
nsAreaFrame::Destroy(nsIPresContext& aPresContext)
{
  mAbsoluteContainer.DestroyFrames(this, aPresContext);
  return nsBlockFrame::Destroy(aPresContext);
}

NS_IMETHODIMP
nsAreaFrame::SetInitialChildList(nsIPresContext& aPresContext,
                                 nsIAtom*        aListName,
                                 nsIFrame*       aChildList)
{
  nsresult  rv;

  if (nsLayoutAtoms::absoluteList == aListName) {
    rv = mAbsoluteContainer.SetInitialChildList(this, aPresContext, aListName, aChildList);
  } else {
    rv = nsBlockFrame::SetInitialChildList(aPresContext, aListName, aChildList);
  }

  return rv;
}

NS_IMETHODIMP
nsAreaFrame::AppendFrames(nsIPresContext& aPresContext,
                          nsIPresShell&   aPresShell,
                          nsIAtom*        aListName,
                          nsIFrame*       aFrameList)
{
  nsresult  rv;

  if (nsLayoutAtoms::absoluteList == aListName) {
    rv = mAbsoluteContainer.AppendFrames(this, aPresContext, aPresShell, aListName,
                                         aFrameList);
  } else {
    rv = nsBlockFrame::AppendFrames(aPresContext, aPresShell, aListName,
                                    aFrameList);
  }

  return rv;
}

NS_IMETHODIMP
nsAreaFrame::InsertFrames(nsIPresContext& aPresContext,
                          nsIPresShell&   aPresShell,
                          nsIAtom*        aListName,
                          nsIFrame*       aPrevFrame,
                          nsIFrame*       aFrameList)
{
  nsresult  rv;

  if (nsLayoutAtoms::absoluteList == aListName) {
    rv = mAbsoluteContainer.InsertFrames(this, aPresContext, aPresShell, aListName,
                                         aPrevFrame, aFrameList);
  } else {
    rv = nsBlockFrame::InsertFrames(aPresContext, aPresShell, aListName,
                                    aPrevFrame, aFrameList);
  }

  return rv;
}

NS_IMETHODIMP
nsAreaFrame::RemoveFrame(nsIPresContext& aPresContext,
                         nsIPresShell&   aPresShell,
                         nsIAtom*        aListName,
                         nsIFrame*       aOldFrame)
{
  nsresult  rv;

  if (nsLayoutAtoms::absoluteList == aListName) {
    rv = mAbsoluteContainer.RemoveFrame(this, aPresContext, aPresShell, aListName, aOldFrame);
  } else {
    rv = nsBlockFrame::RemoveFrame(aPresContext, aPresShell, aListName, aOldFrame);
  }

  return rv;
}

NS_IMETHODIMP
nsAreaFrame::GetAdditionalChildListName(PRInt32   aIndex,
                                        nsIAtom** aListName) const
{
  NS_PRECONDITION(nsnull != aListName, "null OUT parameter pointer");
  if (aIndex <= NS_BLOCK_FRAME_LAST_LIST_INDEX) {
    return nsBlockFrame::GetAdditionalChildListName(aIndex, aListName);
  }
  
  *aListName = nsnull;
  if (NS_AREA_FRAME_ABSOLUTE_LIST_INDEX == aIndex) {
    *aListName = nsLayoutAtoms::absoluteList;
    NS_ADDREF(*aListName);
  }
  return NS_OK;
}

NS_IMETHODIMP
nsAreaFrame::FirstChild(nsIAtom* aListName, nsIFrame** aFirstChild) const
{
  NS_PRECONDITION(nsnull != aFirstChild, "null OUT parameter pointer");
  if (aListName == nsLayoutAtoms::absoluteList) {
    return mAbsoluteContainer.FirstChild(this, aListName, aFirstChild);
  }

  return nsBlockFrame::FirstChild(aListName, aFirstChild);
}

// Return the x-most and y-most for the child absolutely positioned
// elements
NS_IMETHODIMP
nsAreaFrame::GetPositionedInfo(nscoord& aXMost, nscoord& aYMost) const
{
  nsresult  rv = mAbsoluteContainer.GetPositionedInfo(this, aXMost, aYMost);

  // If we have child frames that stick outside of our box, and they should
  // be visible, then include them too so the total size is correct
  if (mState & NS_FRAME_OUTSIDE_CHILDREN) {
    const nsStyleDisplay* display = (const nsStyleDisplay*)
      mStyleContext->GetStyleData(eStyleStruct_Display);

    if (NS_STYLE_OVERFLOW_VISIBLE == display->mOverflow) {
      if (mCombinedArea.XMost() > aXMost) {
        aXMost = mCombinedArea.XMost();
      }
      if (mCombinedArea.YMost() > aYMost) {
        aYMost = mCombinedArea.YMost();
      }
    }
  }

  return rv;
}

static void
CalculateContainingBlock(const nsHTMLReflowState& aReflowState,
                         nscoord                  aFrameWidth,
                         nscoord                  aFrameHeight,
                         nscoord&                 aContainingBlockWidth,
                         nscoord&                 aContainingBlockHeight)
{
  aContainingBlockWidth = -1;  // have reflow state calculate
  aContainingBlockHeight = -1; // have reflow state calculate

  // The issue there is that for a 'height' of 'auto' the reflow state code
  // won't know how to calculate the containing block height because it's
  // calculated bottom up. We don't really want to do this for the initial
  // containing block so that's why we have the check for if the element
  // is absolutely or relatively positioned
  if (aReflowState.mStylePosition->IsAbsolutelyPositioned() ||
      (NS_STYLE_POSITION_RELATIVE == aReflowState.mStylePosition->mPosition)) {
    aContainingBlockWidth = aFrameWidth;
    aContainingBlockHeight = aFrameHeight;

    // Containing block is relative to the padding edge
    nsMargin  border;
    if (!aReflowState.mStyleSpacing->GetBorder(border)) {
      NS_NOTYETIMPLEMENTED("percentage border");
    }
    aContainingBlockWidth -= border.left + border.right;
    aContainingBlockHeight -= border.top + border.bottom;
  }
}

NS_IMETHODIMP
nsAreaFrame::Reflow(nsIPresContext&          aPresContext,
                    nsHTMLReflowMetrics&     aDesiredSize,
                    const nsHTMLReflowState& aReflowState,
                    nsReflowStatus&          aStatus)
{
  NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
                 ("enter nsAreaFrame::Reflow: maxSize=%d,%d reason=%d",
                  aReflowState.availableWidth,
                  aReflowState.availableHeight,
                  aReflowState.reason));

  nsresult  rv = NS_OK;

  // See if it's an incremental reflow command
  if (eReflowReason_Incremental == aReflowState.reason) {
    // Give the absolute positioning code a chance to handle it
    nscoord containingBlockWidth;
    nscoord containingBlockHeight;
    PRBool  handled;

    CalculateContainingBlock(aReflowState, mRect.width, mRect.height,
                             containingBlockWidth, containingBlockHeight);
    
    mAbsoluteContainer.IncrementalReflow(this, aPresContext, aReflowState,
                                         containingBlockWidth, containingBlockHeight,
                                         handled);

    // If the incremental reflow command was handled by the absolute positioning
    // code, then we're all done
    if (handled) {
      // Just return our current size as our desired size
      aDesiredSize.width = mRect.width;
      aDesiredSize.height = mRect.height;
      aDesiredSize.ascent = mRect.height;
      aDesiredSize.descent = 0;
  
      // Whether or not we're complete hasn't changed
      aStatus = (nsnull != mNextInFlow) ? NS_FRAME_NOT_COMPLETE : NS_FRAME_COMPLETE;
      return rv;
    }
  }

  // Let the block frame do its reflow first
  rv = nsBlockFrame::Reflow(aPresContext, aDesiredSize, aReflowState, aStatus);

  // Let the absolutely positioned container reflow any absolutely positioned
  // child frames that need to be reflowed, e.g., elements with a percentage
  // based width/height
  if (NS_SUCCEEDED(rv)) {
    nscoord containingBlockWidth;
    nscoord containingBlockHeight;

    CalculateContainingBlock(aReflowState, aDesiredSize.width, aDesiredSize.height,
                             containingBlockWidth, containingBlockHeight);

    rv = mAbsoluteContainer.Reflow(this, aPresContext, aReflowState,
                                   containingBlockWidth, containingBlockHeight);
  }

#ifdef NOISY_MAX_ELEMENT_SIZE
  ListTag(stdout);
  printf(": maxElementSize=%d,%d desiredSize=%d,%d\n",
         aDesiredSize.maxElementSize ? aDesiredSize.maxElementSize->width : 0,
         aDesiredSize.maxElementSize ? aDesiredSize.maxElementSize->height : 0,
         aDesiredSize.width, aDesiredSize.height);
#endif

  // If we have children that stick outside our box, then remember the
  // combined area, because we'll need it later when sizing our view
  if (mState & NS_FRAME_OUTSIDE_CHILDREN) {
    mCombinedArea = aDesiredSize.mCombinedArea;
  }

  return rv;
}

NS_IMETHODIMP
nsAreaFrame::GetFrameType(nsIAtom** aType) const
{
  NS_PRECONDITION(nsnull != aType, "null OUT parameter pointer");
  *aType = nsLayoutAtoms::areaFrame; 
  NS_ADDREF(*aType);
  return NS_OK;
}

/////////////////////////////////////////////////////////////////////////////
// Diagnostics

#ifdef NS_DEBUG
NS_IMETHODIMP
nsAreaFrame::GetFrameName(nsString& aResult) const
{
  return MakeFrameName("Area", aResult);
}

NS_IMETHODIMP
nsAreaFrame::SizeOf(nsISizeOfHandler* aHandler, PRUint32* aResult) const
{
  if (!aResult) {
    return NS_ERROR_NULL_POINTER;
  }
  nsBlockFrame::SizeOf(aHandler, aResult);
  *aResult += sizeof(*this) - sizeof(nsBlockFrame);

  return NS_OK;
}
#endif