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      1 /*
      2  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
      3  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
      4  * Copyright (C) 2009 Adam Barth. All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  *
     10  * 1.  Redistributions of source code must retain the above copyright
     11  *     notice, this list of conditions and the following disclaimer.
     12  * 2.  Redistributions in binary form must reproduce the above copyright
     13  *     notice, this list of conditions and the following disclaimer in the
     14  *     documentation and/or other materials provided with the distribution.
     15  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
     16  *     its contributors may be used to endorse or promote products derived
     17  *     from this software without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     20  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     21  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     22  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     23  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     24  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     26  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef NavigationScheduler_h
     32 #define NavigationScheduler_h
     33 
     34 #include "Event.h"
     35 #include "Timer.h"
     36 #include <wtf/Forward.h>
     37 #include <wtf/Noncopyable.h>
     38 #include <wtf/OwnPtr.h>
     39 #include <wtf/PassOwnPtr.h>
     40 #include <wtf/PassRefPtr.h>
     41 
     42 namespace WebCore {
     43 
     44 class FormState;
     45 class FormSubmission;
     46 class Frame;
     47 class ScheduledNavigation;
     48 class SecurityOrigin;
     49 
     50 struct FrameLoadRequest;
     51 
     52 class NavigationDisablerForBeforeUnload {
     53     WTF_MAKE_NONCOPYABLE(NavigationDisablerForBeforeUnload);
     54 
     55 public:
     56     NavigationDisablerForBeforeUnload()
     57     {
     58         s_navigationDisableCount++;
     59     }
     60     ~NavigationDisablerForBeforeUnload()
     61     {
     62         ASSERT(s_navigationDisableCount);
     63         s_navigationDisableCount--;
     64     }
     65     static bool isNavigationAllowed() { return !s_navigationDisableCount; }
     66 
     67 private:
     68     static unsigned s_navigationDisableCount;
     69 };
     70 
     71 class NavigationScheduler {
     72     WTF_MAKE_NONCOPYABLE(NavigationScheduler);
     73 
     74 public:
     75     NavigationScheduler(Frame*);
     76     ~NavigationScheduler();
     77 
     78     bool redirectScheduledDuringLoad();
     79     bool locationChangePending();
     80 
     81     void scheduleRedirect(double delay, const String& url);
     82     void scheduleLocationChange(PassRefPtr<SecurityOrigin>, const String& url, const String& referrer, bool lockHistory = true, bool lockBackForwardList = true);
     83     void scheduleFormSubmission(PassRefPtr<FormSubmission>);
     84     void scheduleRefresh();
     85     void scheduleHistoryNavigation(int steps);
     86 
     87     void startTimer();
     88 
     89     void cancel(bool newLoadInProgress = false);
     90     void clear();
     91 
     92 private:
     93     bool shouldScheduleNavigation() const;
     94     bool shouldScheduleNavigation(const String& url) const;
     95 
     96     void timerFired(Timer<NavigationScheduler>*);
     97     void schedule(PassOwnPtr<ScheduledNavigation>);
     98 
     99     static bool mustLockBackForwardList(Frame* targetFrame);
    100 
    101     Frame* m_frame;
    102     Timer<NavigationScheduler> m_timer;
    103     OwnPtr<ScheduledNavigation> m_redirect;
    104 };
    105 
    106 } // namespace WebCore
    107 
    108 #endif // NavigationScheduler_h
    109