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       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/. */
       5             : 
       6             : /**
       7             : 
       8             :   Eric D Vaughan
       9             :   A frame that can have multiple children. Only one child may be displayed at one time. So the
      10             :   can be flipped though like a deck of cards.
      11             : 
      12             : **/
      13             : 
      14             : #ifndef nsStackLayout_h___
      15             : #define nsStackLayout_h___
      16             : 
      17             : #include "mozilla/Attributes.h"
      18             : #include "nsBoxLayout.h"
      19             : #include "nsCOMPtr.h"
      20             : #include "nsCoord.h"
      21             : 
      22             : class nsIPresShell;
      23             : 
      24             : nsresult NS_NewStackLayout(nsCOMPtr<nsBoxLayout>& aNewLayout);
      25             : 
      26           0 : class nsStackLayout : public nsBoxLayout
      27             : {
      28             : public:
      29             : 
      30             :   friend nsresult NS_NewStackLayout(nsCOMPtr<nsBoxLayout>& aNewLayout);
      31             :   static void Shutdown();
      32             : 
      33             :   nsStackLayout();
      34             : 
      35             :   NS_IMETHOD XULLayout(nsIFrame* aBox, nsBoxLayoutState& aState) override;
      36             : 
      37             :   virtual nsSize GetXULPrefSize(nsIFrame* aBox, nsBoxLayoutState& aBoxLayoutState) override;
      38             :   virtual nsSize GetXULMinSize(nsIFrame* aBox, nsBoxLayoutState& aBoxLayoutState) override;
      39             :   virtual nsSize GetXULMaxSize(nsIFrame* aBox, nsBoxLayoutState& aBoxLayoutState) override;
      40             :   virtual nscoord GetAscent(nsIFrame* aBox, nsBoxLayoutState& aBoxLayoutState) override;
      41             : 
      42             :   // get the child offsets for aChild and set them in aMargin. Returns a
      43             :   // bitfield mask of the SPECIFIED_LEFT, SPECIFIED_RIGHT, SPECIFIED_TOP and
      44             :   // SPECIFIED_BOTTOM offsets indicating which sides have been specified by
      45             :   // attributes.
      46             :   static uint8_t GetOffset(nsIFrame* aChild, nsMargin& aMargin);
      47             : 
      48             : private:
      49             :   static nsBoxLayout* gInstance;
      50             : 
      51             : }; // class nsStackLayout
      52             : 
      53             : 
      54             : 
      55             : #endif
      56             :