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lightning-sunbird  0.9+nobinonly
nsChangeHint.h
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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00037 #ifndef nsChangeHint_h___
00038 #define nsChangeHint_h___
00039 
00040 #include "prtypes.h"
00041 
00042 // Defines for various style related constants
00043 
00044 enum nsChangeHint {
00045   nsChangeHint_RepaintFrame = 0x01,  // change was visual only (e.g., COLOR=)
00046   nsChangeHint_ReflowFrame = 0x02,   // change requires reflow (e.g., WIDTH=)
00047   nsChangeHint_SyncFrameView = 0x04, // change requires view to be updated, if there is one (e.g., clip:)
00048   nsChangeHint_UpdateCursor = 0x08,  // The currently shown mouse cursor needs to be updated
00049   nsChangeHint_ReconstructFrame = 0x10   // change requires frame change (e.g., display:)
00050                                          // This subsumes all the above
00051   // TBD: add nsChangeHint_ForceFrameView to force frame reconstruction if the frame doesn't yet
00052   // have a view
00053 };
00054 
00055 #ifdef DEBUG_roc
00056 // Redefine these operators to return nothing. This will catch any use
00057 // of these operators on hints. We should not be using these operators
00058 // on nsChangeHints
00059 inline void operator<(nsChangeHint s1, nsChangeHint s2) {}
00060 inline void operator>(nsChangeHint s1, nsChangeHint s2) {}
00061 inline void operator!=(nsChangeHint s1, nsChangeHint s2) {}
00062 inline void operator==(nsChangeHint s1, nsChangeHint s2) {}
00063 inline void operator<=(nsChangeHint s1, nsChangeHint s2) {}
00064 inline void operator>=(nsChangeHint s1, nsChangeHint s2) {}
00065 #endif
00066 
00067 // Operators on nsChangeHints
00068 
00069 // Merge two hints, taking the union
00070 inline nsChangeHint NS_CombineHint(nsChangeHint aH1, nsChangeHint aH2) {
00071   return (nsChangeHint)(aH1 | aH2);
00072 }
00073 
00074 // Merge two hints, taking the union
00075 inline nsChangeHint NS_SubtractHint(nsChangeHint aH1, nsChangeHint aH2) {
00076   return (nsChangeHint)(aH1 & ~aH2);
00077 }
00078 
00079 // Merge the "src" hint into the "dst" hint
00080 // Returns true iff the destination changed
00081 inline PRBool NS_UpdateHint(nsChangeHint& aDest, nsChangeHint aSrc) {
00082   nsChangeHint r = (nsChangeHint)(aDest | aSrc);
00083   PRBool changed = (int)r != (int)aDest;
00084   aDest = r;
00085   return changed;
00086 }
00087 
00088 // Returns true iff the second hint contains all the hints of the first hint
00089 inline PRBool NS_IsHintSubset(nsChangeHint aSubset, nsChangeHint aSuperSet) {
00090   return (aSubset & aSuperSet) == aSubset;
00091 }
00092 
00093 // Redefine the old NS_STYLE_HINT constants in terms of the new hint structure
00094 #define NS_STYLE_HINT_NONE \
00095   nsChangeHint(0)
00096 #define NS_STYLE_HINT_VISUAL \
00097   nsChangeHint(nsChangeHint_RepaintFrame | nsChangeHint_SyncFrameView)
00098 #define NS_STYLE_HINT_REFLOW \
00099   nsChangeHint(NS_STYLE_HINT_VISUAL | nsChangeHint_ReflowFrame)
00100 #define NS_STYLE_HINT_FRAMECHANGE \
00101   nsChangeHint(NS_STYLE_HINT_REFLOW | nsChangeHint_ReconstructFrame)
00102 
00103 
00109 enum nsReStyleHint {
00110   eReStyle_Self = 0x1,
00111   eReStyle_LaterSiblings = 0x2
00112 };
00113 
00114 
00115 #endif /* nsChangeHint_h___ */