The Tor Browser: layout/xul/grid/nsGridRowLayout.cpp@925c144e1f1f (annotated)

layout/xul/grid/nsGridRowLayout.cpp@925c144e1f1f (annotated)

layout/xul/grid/nsGridRowLayout.cpp

Fri, 16 Jan 2015 18:13:44 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Fri, 16 Jan 2015 18:13:44 +0100
branch: TOR_BUG_9701
changeset 14: 925c144e1f1f
permissions: -rw-r--r--

Integrate suggestion from review to improve consistency with existing code.

 /* -*- 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)

The Tor Browser / annotate

layout/xul/grid/nsGridRowLayout.cpp@925c144e1f1f (annotated)

layout/xul/grid/nsGridRowLayout.cpp