gecko-dev/layout/xul/base/src/grid/nsGridRowLeafFrame.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * for the specific language governing rights and limitations under the
 * License.
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 * The Original Code is Mozilla Communicator client code.
 *
 * The Initial Developer of the Original Code is 
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 * the Initial Developer. All Rights Reserved.
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//
// Eric Vaughan
// Netscape Communications
//
// See documentation in associated header file
//

#include "nsGridRowLeafFrame.h"
#include "nsGridRowLeafLayout.h"
#include "nsGridRow.h"
#include "nsBoxLayoutState.h"
#include "nsGridLayout2.h"

nsresult
NS_NewGridRowLeafFrame ( nsIPresShell* aPresShell, nsIFrame** aNewFrame, PRBool aIsRoot, nsIBoxLayout* aLayoutManager)
{
    NS_PRECONDITION(aNewFrame, "null OUT ptr");
    if (nsnull == aNewFrame) {
        return NS_ERROR_NULL_POINTER;
    }
    nsGridRowLeafFrame* it = new (aPresShell) nsGridRowLeafFrame (aPresShell, aIsRoot, aLayoutManager);
    if (nsnull == it)
        return NS_ERROR_OUT_OF_MEMORY;

    *aNewFrame = it;
    return NS_OK;

} 

nsGridRowLeafFrame::nsGridRowLeafFrame(nsIPresShell* aPresShell, PRBool aIsRoot, nsIBoxLayout* aLayoutManager)
:nsBoxFrame(aPresShell, aIsRoot, aLayoutManager)
{

}

/*
 * Our border and padding could be affected by our columns or rows
 * Lets go check it out.
 */
NS_IMETHODIMP
nsGridRowLeafFrame::GetBorderAndPadding(nsMargin& aBorderAndPadding)
{
  // if our columns have made our padding larger add it in.
  nsMargin borderPadding(0,0,0,0);
  nsresult rv = nsBoxFrame::GetBorderAndPadding(aBorderAndPadding);

  nsCOMPtr<nsIBoxLayout> layout;
  GetLayoutManager(getter_AddRefs(layout));
  if (!layout)
    return rv;

  nsCOMPtr<nsIGridPart> part = do_QueryInterface(layout);
  if (!part)
    return rv;
    
  nsGrid* grid = nsnull;
  PRInt32 index = 0;
  part->GetGrid(this, &grid, &index);

  if (!grid) 
    return rv;

  PRInt32 isRow = IsHorizontal();

  nsBoxLayoutState state((nsIPresContext*)nsnull);

  // only the first and last rows can be affected.
  nsGridRow* row = grid->GetRowAt(0, isRow);
  if (row && row->GetBox() == this) {
    
    nscoord top = 0;
    nscoord bottom = 0;
    //grid->GetRowTopBottomPadding(index, top, PR_TRUE, isRow);
    grid->GetRowOffsets(state, 0, top, bottom, isRow);

    if (isRow) {
      if (top > aBorderAndPadding.top)
        aBorderAndPadding.top = top;
    } else {
      if (top > aBorderAndPadding.left)
        aBorderAndPadding.left = top;
    } 
  }

  nscoord count = grid->GetRowCount(isRow);
  if (count == 0)
    return rv;

  row = grid->GetRowAt(count-1, isRow);
  if (row && row->GetBox() == this) {
    
    nscoord top = 0;
    nscoord bottom = 0;
    //grid->GetRowTopBottomPadding(index, bottom, PR_FALSE, isRow);
    grid->GetRowOffsets(state, count-1, top, bottom, isRow);

    if (isRow) {
      if (bottom > aBorderAndPadding.bottom)
        aBorderAndPadding.bottom = bottom;
    } else {
      if (bottom > aBorderAndPadding.right)
        aBorderAndPadding.right = bottom;
    }
    
  }  
  
  return rv;
}