1 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 : /* ***** BEGIN LICENSE BLOCK *****
3 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
4 : *
5 : * The contents of this file are subject to the Mozilla Public License Version
6 : * 1.1 (the "License"); you may not use this file except in compliance with
7 : * the License. You may obtain a copy of the License at
8 : * http://www.mozilla.org/MPL/
9 : *
10 : * Software distributed under the License is distributed on an "AS IS" basis,
11 : * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12 : * for the specific language governing rights and limitations under the
13 : * License.
14 : *
15 : * The Original Code is Mozilla Communicator client code.
16 : *
17 : * The Initial Developer of the Original Code is
18 : * Netscape Communications Corporation.
19 : * Portions created by the Initial Developer are Copyright (C) 1998
20 : * the Initial Developer. All Rights Reserved.
21 : *
22 : * Contributor(s):
23 : * David Hyatt (hyatt@netscape.com)
24 : *
25 : * Alternatively, the contents of this file may be used under the terms of
26 : * either of the GNU General Public License Version 2 or later (the "GPL"),
27 : * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
28 : * in which case the provisions of the GPL or the LGPL are applicable instead
29 : * of those above. If you wish to allow use of your version of this file only
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32 : * decision by deleting the provisions above and replace them with the notice
33 : * and other provisions required by the GPL or the LGPL. If you do not delete
34 : * the provisions above, a recipient may use your version of this file under
35 : * the terms of any one of the MPL, the GPL or the LGPL.
36 : *
37 : * ***** END LICENSE BLOCK ***** */
38 :
39 : /**
40 :
41 : Eric D Vaughan
42 : A frame that can have multiple children. Only one child may be displayed at one time. So the
43 : can be flipped though like a deck of cards.
44 :
45 : **/
46 :
47 : #ifndef nsStackLayout_h___
48 : #define nsStackLayout_h___
49 :
50 : #include "nsBoxLayout.h"
51 : #include "nsCOMPtr.h"
52 :
53 : nsresult NS_NewStackLayout(nsIPresShell* aPresShell, nsCOMPtr<nsBoxLayout>& aNewLayout);
54 :
55 : class nsStackLayout : public nsBoxLayout
56 0 : {
57 : public:
58 :
59 : friend nsresult NS_NewStackLayout(nsIPresShell* aPresShell, nsCOMPtr<nsBoxLayout>& aNewLayout);
60 : static void Shutdown();
61 :
62 : nsStackLayout();
63 :
64 : NS_IMETHOD Layout(nsIBox* aBox, nsBoxLayoutState& aState);
65 :
66 : virtual nsSize GetPrefSize(nsIBox* aBox, nsBoxLayoutState& aBoxLayoutState);
67 : virtual nsSize GetMinSize(nsIBox* aBox, nsBoxLayoutState& aBoxLayoutState);
68 : virtual nsSize GetMaxSize(nsIBox* aBox, nsBoxLayoutState& aBoxLayoutState);
69 : virtual nscoord GetAscent(nsIBox* aBox, nsBoxLayoutState& aBoxLayoutState);
70 :
71 : // get the child offsets for aChild and set them in aMargin. Returns a
72 : // bitfield mask of the SPECIFIED_LEFT, SPECIFIED_RIGHT, SPECIFIED_TOP and
73 : // SPECIFIED_BOTTOM offsets indicating which sides have been specified by
74 : // attributes.
75 : static PRUint8 GetOffset(nsBoxLayoutState& aState, nsIBox* aChild, nsMargin& aMargin);
76 :
77 : private:
78 : static nsBoxLayout* gInstance;
79 :
80 : }; // class nsStackLayout
81 :
82 :
83 :
84 : #endif
85 :
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