gecko/layout/xul/grid/nsGridRowGroupFrame.cpp

64 lines
1.6 KiB
C++

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