1 /*
2  * Copyright (C) 2010 Google Inc. All rights reserved.
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4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
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9  *     notice, this list of conditions and the following disclaimer.
10  * 2.  Redistributions in binary form must reproduce the above copyright
11  *     notice, this list of conditions and the following disclaimer in the
12  *     documentation and/or other materials provided with the distribution.
13  * 3.  Neither the name of Google, Inc. nor the names of
14  *     its contributors may be used to endorse or promote products derived
15  *     from this software without specific prior written permission.
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17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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27  */
28 
29 #ifndef FrameLoaderStateMachine_h
30 #define FrameLoaderStateMachine_h
31 
32 #include <wtf/Noncopyable.h>
33 
34 namespace WebCore {
35 
36 // Encapsulates a state machine for FrameLoader. Note that this is different from FrameState,
37 // which stores the state of the current load that FrameLoader is executing.
38 class FrameLoaderStateMachine {
39     WTF_MAKE_NONCOPYABLE(FrameLoaderStateMachine);
40 public:
41     FrameLoaderStateMachine();
42 
43     // Once a load has been committed, the state may
44     // alternate between CommittedFirstRealLoad and FirstLayoutDone.
45     // Otherwise, the states only go down the list.
46     enum State {
47         Uninitialized,
48         CreatingInitialEmptyDocument,
49         DisplayingInitialEmptyDocument,
50         DisplayingInitialEmptyDocumentPostCommit,
51         CommittedFirstRealLoad,
52         FirstLayoutDone
53     };
54 
55     bool committingFirstRealLoad() const;
56     bool committedFirstRealDocumentLoad() const;
57     bool creatingInitialEmptyDocument() const;
58     bool isDisplayingInitialEmptyDocument() const;
59     bool firstLayoutDone() const;
60     void advanceTo(State);
61 
62 private:
63     State m_state;
64 };
65 
66 } // namespace WebCore
67 
68 #endif // FrameLoaderStateMachine_h
69