The Tor Browser / file revision

 /* -*- 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

 //

 #include "nsGridRowLayout.h"

 #include "nsBoxLayoutState.h"

 #include "nsIScrollableFrame.h"

 #include "nsBox.h"

 #include "nsStackLayout.h"

 #include "nsGrid.h"

 nsGridRowLayout::nsGridRowLayout():nsSprocketLayout()

 {

 }

 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 = aBox->GetParentBox();

   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 = aBox->GetChildBox();

    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->GetLayoutManager();

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

      if (gridRow) 

      {

        if (layout == aRequestor) {

           index = count;

           break;

        }

        count += gridRow->GetRowCount();

      } else 

        count++;

      child = child->GetNextBox();

    }

    // 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 = aBox->GetNextBox();

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

     nsIFrame* child = parent->GetChildBox();

     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->GetMargin(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)