1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4  * License, v. 2.0. If a copy of the MPL was not distributed with this
5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6 
7 /**
8 
9   Eric D Vaughan
10   A frame that can have multiple children. Only one child may be displayed at
11 one time. So the can be flipped though like a deck of cards.
12 
13 **/
14 
15 #ifndef nsStackLayout_h___
16 #define nsStackLayout_h___
17 
18 #include "mozilla/Attributes.h"
19 #include "nsBoxLayout.h"
20 #include "nsCOMPtr.h"
21 #include "nsCoord.h"
22 
23 nsresult NS_NewStackLayout(nsCOMPtr<nsBoxLayout>& aNewLayout);
24 
25 class nsStackLayout : public nsBoxLayout {
26  public:
27   friend nsresult NS_NewStackLayout(nsCOMPtr<nsBoxLayout>& aNewLayout);
28   static void Shutdown();
29 
30   nsStackLayout();
31 
32   NS_IMETHOD XULLayout(nsIFrame* aBox, nsBoxLayoutState& aState) override;
33 
34   virtual nsSize GetXULPrefSize(nsIFrame* aBox,
35                                 nsBoxLayoutState& aBoxLayoutState) override;
36   virtual nsSize GetXULMinSize(nsIFrame* aBox,
37                                nsBoxLayoutState& aBoxLayoutState) override;
38   virtual nsSize GetXULMaxSize(nsIFrame* aBox,
39                                nsBoxLayoutState& aBoxLayoutState) override;
40   virtual nscoord GetAscent(nsIFrame* aBox,
41                             nsBoxLayoutState& aBoxLayoutState) override;
42 
43  private:
44   static nsBoxLayout* gInstance;
45 
46 };  // class nsStackLayout
47 
48 #endif
49