The Tor Browser: layout/xul/grid/nsGridRowGroupFrame.cpp@fc2d59ddac77

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 //

     7 // Eric Vaughan

     8 // Netscape Communications

     9 //

    10 // See documentation in associated header file

    11 //

    13 #include "nsGridRowGroupFrame.h"

    14 #include "nsGridRowLeafLayout.h"

    15 #include "nsGridRow.h"

    16 #include "nsBoxLayoutState.h"

    17 #include "nsGridLayout2.h"

    19 already_AddRefed<nsBoxLayout> NS_NewGridRowGroupLayout();

    21 nsIFrame*

    22 NS_NewGridRowGroupFrame(nsIPresShell* aPresShell,

    23                         nsStyleContext* aContext)

    24 {

    25   nsCOMPtr<nsBoxLayout> layout = NS_NewGridRowGroupLayout();

    26   return new (aPresShell) nsGridRowGroupFrame(aPresShell, aContext, layout);

    27 }

    29 NS_IMPL_FRAMEARENA_HELPERS(nsGridRowGroupFrame)

    32 /**

    33  * This is redefined because row groups have a funny property. If they are flexible

    34  * then their flex must be equal to the sum of their children's flexes.

    35  */

    36 nscoord

    37 nsGridRowGroupFrame::GetFlex(nsBoxLayoutState& aState)

    38 {

    39   // if we are flexible out flexibility is determined by our columns.

    40   // so first get the our flex. If not 0 then our flex is the sum of

    41   // our columns flexes.

    43   if (!DoesNeedRecalc(mFlex))

    44      return mFlex;

    46   if (nsBoxFrame::GetFlex(aState) == 0)

    47     return 0;

    49   // ok we are flexible add up our children

    50   nscoord totalFlex = 0;

    51   nsIFrame* child = GetChildBox();

    52   while (child)

    53   {

    54     totalFlex += child->GetFlex(aState);

    55     child = child->GetNextBox();

    56   }

    58   mFlex = totalFlex;

    60   return totalFlex;

    61 }

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