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author | Steve Block <steveblock@google.com> | 2011-05-06 11:45:16 +0100 |
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committer | Steve Block <steveblock@google.com> | 2011-05-12 13:44:10 +0100 |
commit | cad810f21b803229eb11403f9209855525a25d57 (patch) | |
tree | 29a6fd0279be608e0fe9ffe9841f722f0f4e4269 /Source/WebCore/dom/ActiveDOMObject.h | |
parent | 121b0cf4517156d0ac5111caf9830c51b69bae8f (diff) | |
download | external_webkit-cad810f21b803229eb11403f9209855525a25d57.zip external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.gz external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.bz2 |
Merge WebKit at r75315: Initial merge by git.
Change-Id: I570314b346ce101c935ed22a626b48c2af266b84
Diffstat (limited to 'Source/WebCore/dom/ActiveDOMObject.h')
-rw-r--r-- | Source/WebCore/dom/ActiveDOMObject.h | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/Source/WebCore/dom/ActiveDOMObject.h b/Source/WebCore/dom/ActiveDOMObject.h new file mode 100644 index 0000000..a6ec7d3 --- /dev/null +++ b/Source/WebCore/dom/ActiveDOMObject.h @@ -0,0 +1,85 @@ +/* + * Copyright (C) 2008 Apple Inc. All Rights Reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY + * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +#ifndef ActiveDOMObject_h +#define ActiveDOMObject_h + +#include <wtf/Assertions.h> + +namespace WebCore { + + class ScriptExecutionContext; + + class ActiveDOMObject { + public: + ActiveDOMObject(ScriptExecutionContext*, void* upcastPointer); + + ScriptExecutionContext* scriptExecutionContext() const { return m_scriptExecutionContext; } + virtual bool hasPendingActivity() const; + + virtual void contextDestroyed(); + + // canSuspend() is used by the caller if there is a choice between suspending and stopping. + // For example, a page won't be suspended and placed in the back/forward cache if it has + // the objects that can not be suspended. + // However, 'suspend' can be called even if canSuspend() would return 'false'. That + // happens in step-by-step JS debugging for example - in this case it would be incorrect + // to stop the object. Exact semantics of suspend is up to the object then. + enum ReasonForSuspension { + JavaScriptDebuggerPaused, + WillShowDialog, + DocumentWillBecomeInactive + }; + virtual bool canSuspend() const; + virtual void suspend(ReasonForSuspension); + virtual void resume(); + virtual void stop(); + + template<class T> void setPendingActivity(T* thisObject) + { + ASSERT(thisObject == this); + thisObject->ref(); + m_pendingActivityCount++; + } + + template<class T> void unsetPendingActivity(T* thisObject) + { + ASSERT(m_pendingActivityCount > 0); + --m_pendingActivityCount; + thisObject->deref(); + } + + protected: + virtual ~ActiveDOMObject(); + + private: + ScriptExecutionContext* m_scriptExecutionContext; + unsigned m_pendingActivityCount; + }; + +} // namespace WebCore + +#endif // ActiveDOMObject_h |