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.org 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 : * Pierre Phaneuf <pp@ludusdesign.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
30 : * under the terms of either the GPL or the LGPL, and not to allow others to
31 : * use your version of this file under the terms of the MPL, indicate your
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 : * container for information saved in session history when the document
41 : * is not
42 : */
43 :
44 : #include "nsILayoutHistoryState.h"
45 : #include "nsWeakReference.h"
46 : #include "nsClassHashtable.h"
47 : #include "nsPresState.h"
48 :
49 : class nsLayoutHistoryState : public nsILayoutHistoryState,
50 : public nsSupportsWeakReference
51 0 : {
52 : public:
53 : NS_HIDDEN_(nsresult) Init();
54 :
55 : NS_DECL_ISUPPORTS
56 :
57 : // nsILayoutHistoryState
58 : NS_IMETHOD AddState(const nsCString& aKey, nsPresState* aState);
59 : NS_IMETHOD GetState(const nsCString& aKey, nsPresState** aState);
60 : NS_IMETHOD RemoveState(const nsCString& aKey);
61 : NS_IMETHOD_(bool) HasStates() const;
62 : NS_IMETHOD SetScrollPositionOnly(const bool aFlag);
63 :
64 :
65 : private:
66 0 : ~nsLayoutHistoryState() {}
67 : bool mScrollPositionOnly;
68 :
69 : nsClassHashtable<nsCStringHashKey,nsPresState> mStates;
70 : };
71 :
72 :
73 : nsresult
74 0 : NS_NewLayoutHistoryState(nsILayoutHistoryState** aState)
75 : {
76 : nsLayoutHistoryState *state;
77 :
78 0 : *aState = nsnull;
79 0 : state = new nsLayoutHistoryState();
80 :
81 0 : NS_ADDREF(state);
82 0 : nsresult rv = state->Init();
83 0 : if (NS_SUCCEEDED(rv))
84 0 : *aState = state;
85 : else
86 0 : NS_RELEASE(state);
87 :
88 0 : return rv;
89 : }
90 :
91 0 : NS_IMPL_ISUPPORTS2(nsLayoutHistoryState,
92 : nsILayoutHistoryState,
93 : nsISupportsWeakReference)
94 :
95 : nsresult
96 0 : nsLayoutHistoryState::Init()
97 : {
98 0 : mScrollPositionOnly = false;
99 0 : return mStates.Init() ? NS_OK : NS_ERROR_FAILURE;
100 : }
101 :
102 : NS_IMETHODIMP
103 0 : nsLayoutHistoryState::AddState(const nsCString& aStateKey, nsPresState* aState)
104 : {
105 0 : return mStates.Put(aStateKey, aState) ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
106 : }
107 :
108 : NS_IMETHODIMP
109 0 : nsLayoutHistoryState::GetState(const nsCString& aKey, nsPresState** aState)
110 : {
111 0 : bool entryExists = mStates.Get(aKey, aState);
112 :
113 0 : if (entryExists && mScrollPositionOnly) {
114 : // Ensure any state that shouldn't be restored is removed
115 0 : (*aState)->ClearNonScrollState();
116 : }
117 :
118 0 : return NS_OK;
119 : }
120 :
121 : NS_IMETHODIMP
122 0 : nsLayoutHistoryState::RemoveState(const nsCString& aKey)
123 : {
124 0 : mStates.Remove(aKey);
125 0 : return NS_OK;
126 : }
127 :
128 : NS_IMETHODIMP_(bool)
129 0 : nsLayoutHistoryState::HasStates() const
130 : {
131 0 : return mStates.Count() != 0;
132 : }
133 :
134 : NS_IMETHODIMP
135 0 : nsLayoutHistoryState::SetScrollPositionOnly(const bool aFlag)
136 : {
137 0 : mScrollPositionOnly = aFlag;
138 0 : return NS_OK;
139 : }
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