/* -*- 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

//

#include "nsGridRowLayout.h"

#include "nsBoxLayoutState.h"

#include "nsIScrollableFrame.h"

#include "nsBox.h"

#include "nsStackLayout.h"

#include "nsGrid.h"

nsGridRowLayout::nsGridRowLayout():nsSprocketLayout()

{

}

nsGridRowLayout::~nsGridRowLayout()

{

}

void

nsGridRowLayout::ChildrenInserted(nsIFrame* aBox, nsBoxLayoutState& aState,

                                  nsIFrame* aPrevBox,

                                  const nsFrameList::Slice& aNewChildren)

{

  ChildAddedOrRemoved(aBox, aState);

}

void

nsGridRowLayout::ChildrenAppended(nsIFrame* aBox, nsBoxLayoutState& aState,

                                  const nsFrameList::Slice& aNewChildren)

{

  ChildAddedOrRemoved(aBox, aState);

}

void

nsGridRowLayout::ChildrenRemoved(nsIFrame* aBox, nsBoxLayoutState& aState, nsIFrame* aChildList)

{

  ChildAddedOrRemoved(aBox, aState);

}

void

nsGridRowLayout::ChildrenSet(nsIFrame* aBox, nsBoxLayoutState& aState, nsIFrame* aChildList)

{

  ChildAddedOrRemoved(aBox, aState);

}

nsIGridPart*

nsGridRowLayout::GetParentGridPart(nsIFrame* aBox, nsIFrame** aParentBox)

{

  // go up and find our parent gridRow. Skip and non gridRow

  // parents.

  *aParentBox = nullptr;

  // walk up through any scrollboxes

  aBox = nsGrid::GetScrollBox(aBox);

  // get the parent

  if (aBox)

    aBox = nsBox::GetParentXULBox(aBox);

  if (aBox)

  {

    nsIGridPart* parentGridRow = nsGrid::GetPartFromBox(aBox);

    if (parentGridRow && parentGridRow->CanContain(this)) {

      *aParentBox = aBox;

      return parentGridRow;

    }

  }

  return nullptr;

}

nsGrid*

nsGridRowLayout::GetGrid(nsIFrame* aBox, int32_t* aIndex, nsGridRowLayout* aRequestor)

{

   if (aRequestor == nullptr)

   {

      nsIFrame* parentBox; // nsIFrame is implemented by nsIFrame and is not refcounted.

      nsIGridPart* parent = GetParentGridPart(aBox, &parentBox);

      if (parent)

         return parent->GetGrid(parentBox, aIndex, this);

      return nullptr;

   }

   int32_t index = -1;

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

   int32_t count = 0;

   while(child)

   {

     // if there is a scrollframe walk inside it to its child

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

     nsBoxLayout* layout = childBox->GetXULLayoutManager();

     nsIGridPart* gridRow = nsGrid::GetPartFromBox(childBox);

     if (gridRow)

     {

       if (layout == aRequestor) {

          index = count;

          break;

       }

       count += gridRow->GetRowCount();

     } else

       count++;

     child = nsBox::GetNextXULBox(child);

   }

   // if we didn't find ourselves then the tree isn't properly formed yet

   // this could happen during initial construction so lets just

   // fail.

   if (index == -1) {

     *aIndex = -1;

     return nullptr;

   }

   (*aIndex) += index;

   nsIFrame* parentBox; // nsIFrame is implemented by nsIFrame and is not refcounted.

   nsIGridPart* parent = GetParentGridPart(aBox, &parentBox);

   if (parent)

     return parent->GetGrid(parentBox, aIndex, this);

   return nullptr;

}

nsMargin

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

{

  // get our parents margin

  nsMargin margin(0,0,0,0);

  nsIFrame* parent = nullptr;

  nsIGridPart* part = GetParentGridPart(aBox, &parent);

  if (part && parent) {

    // if we are the first or last child walk upward and add margins.

    // make sure we check for a scrollbox

    aBox = nsGrid::GetScrollBox(aBox);

    // see if we have a next to see if we are last

    nsIFrame* next = nsBox::GetNextXULBox(aBox);

    // get the parent first child to see if we are first

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

    margin = part->GetTotalMargin(parent, aIsHorizontal);

    // if first or last

    if (child == aBox || next == nullptr) {

       // if it's not the first child remove the top margin

       // we don't need it.

       if (child != aBox)

       {

          if (aIsHorizontal)

              margin.top = 0;

          else

              margin.left = 0;

       }

       // if it's not the last child remove the bottom margin

       // we don't need it.

       if (next != nullptr)

       {

          if (aIsHorizontal)

              margin.bottom = 0;

          else

              margin.right = 0;

       }

    }

  }

  // add ours to it.

  nsMargin ourMargin;

  aBox->GetXULMargin(ourMargin);

  margin += ourMargin;

  return margin;

}

NS_IMPL_ADDREF_INHERITED(nsGridRowLayout, nsBoxLayout)

NS_IMPL_RELEASE_INHERITED(nsGridRowLayout, nsBoxLayout)

NS_INTERFACE_MAP_BEGIN(nsGridRowLayout)

  NS_INTERFACE_MAP_ENTRY(nsIGridPart)

  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIGridPart)

NS_INTERFACE_MAP_END_INHERITING(nsBoxLayout)