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 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

 /* This Source Code Form is subject to the terms of the Mozilla Public

  * License, v. 2.0. If a copy of the MPL was not distributed with this

  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

 //

 // Eric Vaughan

 // Netscape Communications

 //

 // See documentation in associated header file

 //

 /*

  * The nsGridRowGroupLayout implements the <rows> or <columns> tag in a grid. 

  */

 #include "nsGridRowGroupLayout.h"

 #include "nsCOMPtr.h"

 #include "nsIScrollableFrame.h"

 #include "nsBoxLayoutState.h"

 #include "nsGridLayout2.h"

 #include "nsGridRow.h"

 #include "nsHTMLReflowState.h"

 already_AddRefed<nsBoxLayout> NS_NewGridRowGroupLayout()

 {

   nsRefPtr<nsBoxLayout> layout = new nsGridRowGroupLayout();

   return layout.forget();

 } 

 nsGridRowGroupLayout::nsGridRowGroupLayout():nsGridRowLayout(), mRowCount(0)

 {

 }

 nsGridRowGroupLayout::~nsGridRowGroupLayout()

 {

 }

 void

 nsGridRowGroupLayout::ChildAddedOrRemoved(nsIFrame* aBox, nsBoxLayoutState& aState)

 {

   int32_t index = 0;

   nsGrid* grid = GetGrid(aBox, &index);

   bool isHorizontal = IsHorizontal(aBox);

   if (grid)

     grid->RowAddedOrRemoved(aState, index, isHorizontal);

 }

 void

 nsGridRowGroupLayout::AddWidth(nsSize& aSize, nscoord aSize2, bool aIsHorizontal)

 {

   nscoord& size = GET_WIDTH(aSize, aIsHorizontal);

   if (size == NS_INTRINSICSIZE || aSize2 == NS_INTRINSICSIZE)

     size = NS_INTRINSICSIZE;

   else

     size += aSize2;

 }

 nsSize

 nsGridRowGroupLayout::GetPrefSize(nsIFrame* aBox, nsBoxLayoutState& aState)

 { 

   nsSize vpref = nsGridRowLayout::GetPrefSize(aBox, aState); 

  /* It is possible that we could have some extra columns. This is when less columns in XUL were 

   * defined that needed. And example might be a grid with 3 defined columns but a row with 4 cells in 

   * it. We would need an extra column to make the grid work. But because that extra column does not 

   * have a box associated with it we must add its size in manually. Remember we could have extra rows

   * as well.

   */

   int32_t index = 0;

   nsGrid* grid = GetGrid(aBox, &index);

   if (grid) 

   {

     // make sure we add in extra columns sizes as well

     bool isHorizontal = IsHorizontal(aBox);

     int32_t extraColumns = grid->GetExtraColumnCount(isHorizontal);

     int32_t start = grid->GetColumnCount(isHorizontal) - grid->GetExtraColumnCount(isHorizontal);

     for (int32_t i=0; i < extraColumns; i++)

     {

       nscoord pref =

         grid->GetPrefRowHeight(aState, i+start, !isHorizontal); // GetPrefColumnWidth

       AddWidth(vpref, pref, isHorizontal);

     }

   }

   return vpref;

 }

 nsSize

 nsGridRowGroupLayout::GetMaxSize(nsIFrame* aBox, nsBoxLayoutState& aState)

 {

  nsSize maxSize = nsGridRowLayout::GetMaxSize(aBox, aState); 

   int32_t index = 0;

   nsGrid* grid = GetGrid(aBox, &index);

   if (grid) 

   {

     // make sure we add in extra columns sizes as well

     bool isHorizontal = IsHorizontal(aBox);

     int32_t extraColumns = grid->GetExtraColumnCount(isHorizontal);

     int32_t start = grid->GetColumnCount(isHorizontal) - grid->GetExtraColumnCount(isHorizontal);

     for (int32_t i=0; i < extraColumns; i++)

     {

       nscoord max =

         grid->GetMaxRowHeight(aState, i+start, !isHorizontal); // GetMaxColumnWidth

       AddWidth(maxSize, max, isHorizontal);

     }

   }

   return maxSize;

 }

 nsSize

 nsGridRowGroupLayout::GetMinSize(nsIFrame* aBox, nsBoxLayoutState& aState)

 {

   nsSize minSize = nsGridRowLayout::GetMinSize(aBox, aState); 

   int32_t index = 0;

   nsGrid* grid = GetGrid(aBox, &index);

   if (grid) 

   {

     // make sure we add in extra columns sizes as well

     bool isHorizontal = IsHorizontal(aBox);

     int32_t extraColumns = grid->GetExtraColumnCount(isHorizontal);

     int32_t start = grid->GetColumnCount(isHorizontal) - grid->GetExtraColumnCount(isHorizontal);

     for (int32_t i=0; i < extraColumns; i++)

     {

       nscoord min = 

         grid->GetMinRowHeight(aState, i+start, !isHorizontal); // GetMinColumnWidth

       AddWidth(minSize, min, isHorizontal);

     }

   }

   return minSize;

 }

 /*

  * Run down through our children dirtying them recursively.

  */

 void

 nsGridRowGroupLayout::DirtyRows(nsIFrame* aBox, nsBoxLayoutState& aState)

 {

   if (aBox) {

     // mark us dirty

     // XXXldb We probably don't want to walk up the ancestor chain

     // calling MarkIntrinsicWidthsDirty for every row group.

     aState.PresShell()->FrameNeedsReflow(aBox, nsIPresShell::eTreeChange,

                                          NS_FRAME_IS_DIRTY);

     nsIFrame* child = aBox->GetChildBox();

     while(child) {

       // walk into scrollframes

       nsIFrame* deepChild = nsGrid::GetScrolledBox(child);

       // walk into other monuments

       nsIGridPart* monument = nsGrid::GetPartFromBox(deepChild);

       if (monument) 

         monument->DirtyRows(deepChild, aState);

       child = child->GetNextBox();

     }

   }

 }

 void

 nsGridRowGroupLayout::CountRowsColumns(nsIFrame* aBox, int32_t& aRowCount, int32_t& aComputedColumnCount)

 {

   if (aBox) {

     int32_t startCount = aRowCount;

     nsIFrame* child = aBox->GetChildBox();

     while(child) {

       // first see if it is a scrollframe. If so walk down into it and get the scrolled child

       nsIFrame* deepChild = nsGrid::GetScrolledBox(child);

       nsIGridPart* monument = nsGrid::GetPartFromBox(deepChild);

       if (monument) {

         monument->CountRowsColumns(deepChild, aRowCount, aComputedColumnCount);

         child = child->GetNextBox();

         deepChild = child;

         continue;

       }

       child = child->GetNextBox();

       // if not a monument. Then count it. It will be a bogus row

       aRowCount++;

     }

     mRowCount = aRowCount - startCount;

   }

 }

 /**

  * Fill out the given row structure recursively

  */

 int32_t 

 nsGridRowGroupLayout::BuildRows(nsIFrame* aBox, nsGridRow* aRows)

 { 

   int32_t rowCount = 0;

   if (aBox) {

     nsIFrame* child = aBox->GetChildBox();

     while(child) {

       // first see if it is a scrollframe. If so walk down into it and get the scrolled child

       nsIFrame* deepChild = nsGrid::GetScrolledBox(child);

       nsIGridPart* monument = nsGrid::GetPartFromBox(deepChild);

       if (monument) {

         rowCount += monument->BuildRows(deepChild, &aRows[rowCount]);

         child = child->GetNextBox();

         deepChild = child;

         continue;

       }

       aRows[rowCount].Init(child, true);

       child = child->GetNextBox();

       // if not a monument. Then count it. It will be a bogus row

       rowCount++;

     }

   }

   return rowCount;

 }

 nsMargin

 nsGridRowGroupLayout::GetTotalMargin(nsIFrame* aBox, bool aIsHorizontal)

 {

   // group have border and padding added to the total margin

   nsMargin margin = nsGridRowLayout::GetTotalMargin(aBox, aIsHorizontal);

   // make sure we have the scrollframe on the outside if it has one.

   // that's where the border is.

   aBox = nsGrid::GetScrollBox(aBox);

   // add our border/padding to it

   nsMargin borderPadding(0,0,0,0);

   aBox->GetBorderAndPadding(borderPadding);

   margin += borderPadding;

   return margin;

 }