michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: /*
michael@0:  * interface for rendering objects whose state is saved in
michael@0:  * session-history (back-forward navigation)
michael@0:  */
michael@0: 
michael@0: #ifndef _nsIStatefulFrame_h
michael@0: #define _nsIStatefulFrame_h
michael@0: 
michael@0: #include "nsQueryFrame.h"
michael@0: 
michael@0: class nsPresState;
michael@0: 
michael@0: class nsIStatefulFrame
michael@0: {
michael@0:  public: 
michael@0:   NS_DECL_QUERYFRAME_TARGET(nsIStatefulFrame)
michael@0: 
michael@0:   // Save the state for this frame.  If this method succeeds, the caller is
michael@0:   // responsible for deleting the resulting state when done with it.
michael@0:   NS_IMETHOD SaveState(nsPresState** aState) = 0;
michael@0: 
michael@0:   // Restore the state for this frame from aState
michael@0:   NS_IMETHOD RestoreState(nsPresState* aState) = 0;
michael@0: };
michael@0: 
michael@0: #endif /* _nsIStatefulFrame_h */