/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* 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 "nsBox.h"

#include "nsBoxLayoutState.h"

#include "nsGridLayout2.h"

#include "nsGridRow.h"

#include "mozilla/ReflowInput.h"

already_AddRefed<nsBoxLayout> NS_NewGridRowGroupLayout()

{

  RefPtr<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 = IsXULHorizontal(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::GetXULPrefSize(nsIFrame* aBox, nsBoxLayoutState& aState)

{

  nsSize vpref = nsGridRowLayout::GetXULPrefSize(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 = IsXULHorizontal(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::GetXULMaxSize(nsIFrame* aBox, nsBoxLayoutState& aState)

{

 nsSize maxSize = nsGridRowLayout::GetXULMaxSize(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 = IsXULHorizontal(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::GetXULMinSize(nsIFrame* aBox, nsBoxLayoutState& aState)

{

  nsSize minSize = nsGridRowLayout::GetXULMinSize(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 = IsXULHorizontal(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 MarkIntrinsicISizesDirty for every row group.

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

                                         NS_FRAME_IS_DIRTY);

    nsIFrame* child = nsBox::GetChildXULBox(aBox);

    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 = nsBox::GetNextXULBox(child);

    }

  }

}

void

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

{

  if (aBox) {

    int32_t startCount = aRowCount;

    nsIFrame* child = nsBox::GetChildXULBox(aBox);

    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 = nsBox::GetNextXULBox(child);

        deepChild = child;

        continue;

      }

      child = nsBox::GetNextXULBox(child);

      // 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 = nsBox::GetChildXULBox(aBox);

    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 = nsBox::GetNextXULBox(child);

        deepChild = child;

        continue;

      }

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

      child = nsBox::GetNextXULBox(child);

      // 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->GetXULBorderAndPadding(borderPadding);

  margin += borderPadding;

  return margin;

}