1 /* 2 * Copyright (C) 2010 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 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. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 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 CreatingInitialEmptyDocument, 48 DisplayingInitialEmptyDocument, 49 CommittedFirstRealLoad, 50 CommittedMultipleRealLoads 51 }; 52 53 bool committedFirstRealDocumentLoad() const; 54 bool creatingInitialEmptyDocument() const; 55 bool isDisplayingInitialEmptyDocument() const; 56 bool committedMultipleRealLoads() const; 57 void advanceTo(State); 58 59 private: 60 State m_state; 61 }; 62 63 } // namespace WebCore 64 65 #endif // FrameLoaderStateMachine_h 66