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 "nsGridRowGroupFrame.h"
michael@0: #include "nsGridRowLeafLayout.h"
michael@0: #include "nsGridRow.h"
michael@0: #include "nsBoxLayoutState.h"
michael@0: #include "nsGridLayout2.h"
michael@0: 
michael@0: already_AddRefed<nsBoxLayout> NS_NewGridRowGroupLayout();
michael@0: 
michael@0: nsIFrame*
michael@0: NS_NewGridRowGroupFrame(nsIPresShell* aPresShell,
michael@0:                         nsStyleContext* aContext)
michael@0: {
michael@0:   nsCOMPtr<nsBoxLayout> layout = NS_NewGridRowGroupLayout();
michael@0:   return new (aPresShell) nsGridRowGroupFrame(aPresShell, aContext, layout);
michael@0: }
michael@0: 
michael@0: NS_IMPL_FRAMEARENA_HELPERS(nsGridRowGroupFrame)
michael@0: 
michael@0: 
michael@0: /**
michael@0:  * This is redefined because row groups have a funny property. If they are flexible
michael@0:  * then their flex must be equal to the sum of their children's flexes.
michael@0:  */
michael@0: nscoord
michael@0: nsGridRowGroupFrame::GetFlex(nsBoxLayoutState& aState)
michael@0: {
michael@0:   // if we are flexible out flexibility is determined by our columns.
michael@0:   // so first get the our flex. If not 0 then our flex is the sum of
michael@0:   // our columns flexes.
michael@0: 
michael@0:   if (!DoesNeedRecalc(mFlex))
michael@0:      return mFlex;
michael@0: 
michael@0:   if (nsBoxFrame::GetFlex(aState) == 0)
michael@0:     return 0;
michael@0: 
michael@0:   // ok we are flexible add up our children
michael@0:   nscoord totalFlex = 0;
michael@0:   nsIFrame* child = GetChildBox();
michael@0:   while (child)
michael@0:   {
michael@0:     totalFlex += child->GetFlex(aState);
michael@0:     child = child->GetNextBox();
michael@0:   }
michael@0: 
michael@0:   mFlex = totalFlex;
michael@0: 
michael@0:   return totalFlex;
michael@0: }
michael@0: 
michael@0: