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24e7cb1f78
* we know all types frames may be cast to at compile time, so instead of extensible GUID IIDs, use a big enum (see nsQueryFrame::FrameIID) * eliminate all vestiges of refcounting, since frames aren't refcounted Some frames (SVG frames in particular) still implement nsISupports-derived interfaces, for example nsISVGValue. There is a FrameIID for nsISVGValue that lets you go from a frame to the XPCOM interface, but you can't query back. r+sr=roc nsITextControlFrame didn't have an IID the first time around, but this wasn't a compile error because nsITextControlFrame::kFrameIID inherited from nsIFormControlFrame::kFrameIID. I've added a static analysis pass to verify the correct behavior, since I can't figure out a way to make the compiler do it. --HG-- extra : rebase_source : 4894a2ca0278e2ab92f27459db77165f8348cf41
35 lines
1.0 KiB
C++
35 lines
1.0 KiB
C++
/*
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* interface for rendering objects whose state is saved in
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* session-history (back-forward navigation)
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*/
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#ifndef _nsIStatefulFrame_h
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#define _nsIStatefulFrame_h
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#include "nsQueryFrame.h"
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class nsPresContext;
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class nsPresState;
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class nsIStatefulFrame
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{
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public:
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NS_DECLARE_FRAME_ACCESSOR(nsIStatefulFrame)
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// If you create a special type stateful frame (e.g. scroll) that needs
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// to be captured outside of the standard pass through the frames, you'll need
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// a special ID by which to refer to that type.
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enum SpecialStateID {eNoID=0, eDocumentScrollState};
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// Save the state for this frame. Some implementations may choose to return
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// different states depending on the value of aStateID. If this method
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// succeeds, the caller is responsible for deleting the resulting state when
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// done with it.
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NS_IMETHOD SaveState(SpecialStateID aStateID, nsPresState** aState) = 0;
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// Restore the state for this frame from aState
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NS_IMETHOD RestoreState(nsPresState* aState) = 0;
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};
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#endif /* _nsIStatefulFrame_h */
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