michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: //
michael@0: // Eric Vaughan
michael@0: // Netscape Communications
michael@0: //
michael@0: // See documentation in associated header file
michael@0: //
michael@0: 
michael@0: #include "nsGridRowLayout.h"
michael@0: #include "nsBoxLayoutState.h"
michael@0: #include "nsIScrollableFrame.h"
michael@0: #include "nsBox.h"
michael@0: #include "nsStackLayout.h"
michael@0: #include "nsGrid.h"
michael@0: 
michael@0: nsGridRowLayout::nsGridRowLayout():nsSprocketLayout()
michael@0: {
michael@0: }
michael@0: 
michael@0: void
michael@0: nsGridRowLayout::ChildrenInserted(nsIFrame* aBox, nsBoxLayoutState& aState,
michael@0:                                   nsIFrame* aPrevBox,
michael@0:                                   const nsFrameList::Slice& aNewChildren)
michael@0: {
michael@0:   ChildAddedOrRemoved(aBox, aState);
michael@0: }
michael@0: 
michael@0: void
michael@0: nsGridRowLayout::ChildrenAppended(nsIFrame* aBox, nsBoxLayoutState& aState,
michael@0:                                   const nsFrameList::Slice& aNewChildren)
michael@0: {
michael@0:   ChildAddedOrRemoved(aBox, aState);
michael@0: }
michael@0: 
michael@0: void
michael@0: nsGridRowLayout::ChildrenRemoved(nsIFrame* aBox, nsBoxLayoutState& aState, nsIFrame* aChildList)
michael@0: {
michael@0:   ChildAddedOrRemoved(aBox, aState);
michael@0: }
michael@0: 
michael@0: void
michael@0: nsGridRowLayout::ChildrenSet(nsIFrame* aBox, nsBoxLayoutState& aState, nsIFrame* aChildList)
michael@0: {
michael@0:   ChildAddedOrRemoved(aBox, aState);
michael@0: }
michael@0: 
michael@0: nsIGridPart*
michael@0: nsGridRowLayout::GetParentGridPart(nsIFrame* aBox, nsIFrame** aParentBox)
michael@0: {
michael@0:   // go up and find our parent gridRow. Skip and non gridRow
michael@0:   // parents.
michael@0:   *aParentBox = nullptr;
michael@0:   
michael@0:   // walk up through any scrollboxes
michael@0:   aBox = nsGrid::GetScrollBox(aBox);
michael@0: 
michael@0:   // get the parent
michael@0:   if (aBox)
michael@0:     aBox = aBox->GetParentBox();
michael@0: 
michael@0:   if (aBox)
michael@0:   {
michael@0:     nsIGridPart* parentGridRow = nsGrid::GetPartFromBox(aBox);
michael@0:     if (parentGridRow && parentGridRow->CanContain(this)) {
michael@0:       *aParentBox = aBox;
michael@0:       return parentGridRow;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   return nullptr;
michael@0: }
michael@0: 
michael@0: 
michael@0: nsGrid*
michael@0: nsGridRowLayout::GetGrid(nsIFrame* aBox, int32_t* aIndex, nsGridRowLayout* aRequestor)
michael@0: {
michael@0: 
michael@0:    if (aRequestor == nullptr)
michael@0:    {
michael@0:       nsIFrame* parentBox; // nsIFrame is implemented by nsIFrame and is not refcounted.
michael@0:       nsIGridPart* parent = GetParentGridPart(aBox, &parentBox);
michael@0:       if (parent)
michael@0:          return parent->GetGrid(parentBox, aIndex, this);
michael@0:       return nullptr;
michael@0:    }
michael@0: 
michael@0:    int32_t index = -1;
michael@0:    nsIFrame* child = aBox->GetChildBox();
michael@0:    int32_t count = 0;
michael@0:    while(child)
michael@0:    {
michael@0:      // if there is a scrollframe walk inside it to its child
michael@0:      nsIFrame* childBox = nsGrid::GetScrolledBox(child);
michael@0: 
michael@0:      nsBoxLayout* layout = childBox->GetLayoutManager();
michael@0:      nsIGridPart* gridRow = nsGrid::GetPartFromBox(childBox);
michael@0:      if (gridRow) 
michael@0:      {
michael@0:        if (layout == aRequestor) {
michael@0:           index = count;
michael@0:           break;
michael@0:        }
michael@0:        count += gridRow->GetRowCount();
michael@0:      } else 
michael@0:        count++;
michael@0: 
michael@0:      child = child->GetNextBox();
michael@0:    }
michael@0: 
michael@0:    // if we didn't find ourselves then the tree isn't properly formed yet
michael@0:    // this could happen during initial construction so lets just
michael@0:    // fail.
michael@0:    if (index == -1) {
michael@0:      *aIndex = -1;
michael@0:      return nullptr;
michael@0:    }
michael@0: 
michael@0:    (*aIndex) += index;
michael@0: 
michael@0:    nsIFrame* parentBox; // nsIFrame is implemented by nsIFrame and is not refcounted.
michael@0:    nsIGridPart* parent = GetParentGridPart(aBox, &parentBox);
michael@0:    if (parent)
michael@0:      return parent->GetGrid(parentBox, aIndex, this);
michael@0: 
michael@0:    return nullptr;
michael@0: }
michael@0: 
michael@0: nsMargin
michael@0: nsGridRowLayout::GetTotalMargin(nsIFrame* aBox, bool aIsHorizontal)
michael@0: {
michael@0:   // get our parents margin
michael@0:   nsMargin margin(0,0,0,0);
michael@0:   nsIFrame* parent = nullptr;
michael@0:   nsIGridPart* part = GetParentGridPart(aBox, &parent);
michael@0:   if (part && parent) {
michael@0:     // if we are the first or last child walk upward and add margins.
michael@0: 
michael@0:     // make sure we check for a scrollbox
michael@0:     aBox = nsGrid::GetScrollBox(aBox);
michael@0: 
michael@0:     // see if we have a next to see if we are last
michael@0:     nsIFrame* next = aBox->GetNextBox();
michael@0: 
michael@0:     // get the parent first child to see if we are first
michael@0:     nsIFrame* child = parent->GetChildBox();
michael@0: 
michael@0:     margin = part->GetTotalMargin(parent, aIsHorizontal);
michael@0: 
michael@0:     // if first or last
michael@0:     if (child == aBox || next == nullptr) {
michael@0: 
michael@0:        // if it's not the first child remove the top margin
michael@0:        // we don't need it.
michael@0:        if (child != aBox)
michael@0:        {
michael@0:           if (aIsHorizontal)
michael@0:               margin.top = 0;
michael@0:           else 
michael@0:               margin.left = 0;
michael@0:        }
michael@0: 
michael@0:        // if it's not the last child remove the bottom margin
michael@0:        // we don't need it.
michael@0:        if (next != nullptr)
michael@0:        {
michael@0:           if (aIsHorizontal)
michael@0:               margin.bottom = 0;
michael@0:           else 
michael@0:               margin.right = 0;
michael@0:        }
michael@0: 
michael@0:     }
michael@0:   }
michael@0:     
michael@0:   // add ours to it.
michael@0:   nsMargin ourMargin;
michael@0:   aBox->GetMargin(ourMargin);
michael@0:   margin += ourMargin;
michael@0: 
michael@0:   return margin;
michael@0: }
michael@0: 
michael@0: NS_IMPL_ADDREF_INHERITED(nsGridRowLayout, nsBoxLayout)
michael@0: NS_IMPL_RELEASE_INHERITED(nsGridRowLayout, nsBoxLayout)
michael@0: 
michael@0: NS_INTERFACE_MAP_BEGIN(nsGridRowLayout)
michael@0:   NS_INTERFACE_MAP_ENTRY(nsIGridPart)
michael@0:   NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIGridPart)
michael@0: NS_INTERFACE_MAP_END_INHERITING(nsBoxLayout)