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40 lines
1.2 KiB
C++
40 lines
1.2 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 "nsISupports.h"
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class nsPresContext;
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class nsPresState;
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#define NS_ISTATEFULFRAME_IID \
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{ 0x25c232cf, 0x40ba, 0x4394, \
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{ 0x84, 0xe4, 0x73, 0xa2, 0xf7, 0x4d, 0x8b, 0x64 } }
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class nsIStatefulFrame : public nsISupports {
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_ISTATEFULFRAME_IID)
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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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NS_DEFINE_STATIC_IID_ACCESSOR(nsIStatefulFrame, NS_ISTATEFULFRAME_IID)
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#endif /* _nsIStatefulFrame_h */
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