gecko-dev/layout/base/nsChangeHint.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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* The Original Code is mozilla.org code.
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/* constants for what needs to be recomputed in response to style changes */
#ifndef nsChangeHint_h___
#define nsChangeHint_h___
#include "prtypes.h"
// Defines for various style related constants
enum nsChangeHint {
// change was visual only (e.g., COLOR=)
nsChangeHint_RepaintFrame = 0x01,
// For reflow, we want flags to give us arbitrary FrameNeedsReflow behavior.
// just do a FrameNeedsReflow
nsChangeHint_NeedReflow = 0x02,
// Invalidate intrinsic widths on the frame's ancestors. Must not be set
// without setting nsChangeHint_NeedReflow.
nsChangeHint_ClearAncestorIntrinsics = 0x04,
// Invalidate intrinsic widths on the frame's descendants. Must not be set
// without also setting nsChangeHint_ClearAncestorIntrinsics.
nsChangeHint_ClearDescendantIntrinsics = 0x08,
// Force unconditional reflow of all descendants. Must not be set without
// setting nsChangeHint_NeedReflow, but is independent of both the
// Clear*Intrinsics flags.
nsChangeHint_NeedDirtyReflow = 0x10,
// change requires view to be updated, if there is one (e.g., clip:)
nsChangeHint_SyncFrameView = 0x20,
// The currently shown mouse cursor needs to be updated
nsChangeHint_UpdateCursor = 0x40,
/**
* SVG filter/mask/clip effects need to be recomputed because the URI
* in the filter/mask/clip-path property has changed. This wipes
* out cached nsSVGPropertyBase and subclasses which hold a reference to
* the element referenced by the URI, and a mutation observer for
* the DOM subtree rooted at that element. Also, for filters they store a
* bounding-box for the filter result so that if the filter changes we can
* invalidate the old covered area.
*/
nsChangeHint_UpdateEffects = 0x80,
/**
* Visual change only, but the change can be handled entirely by
* updating the layer(s) for the frame.
*/
nsChangeHint_UpdateOpacityLayer = 0x100,
nsChangeHint_UpdateTransformLayer = 0x200,
// change requires frame change (e.g., display:).
// This subsumes all the above.
nsChangeHint_ReconstructFrame = 0x400
};
// Redefine these operators to return nothing. This will catch any use
// of these operators on hints. We should not be using these operators
// on nsChangeHints
inline void operator<(nsChangeHint s1, nsChangeHint s2) {}
inline void operator>(nsChangeHint s1, nsChangeHint s2) {}
inline void operator!=(nsChangeHint s1, nsChangeHint s2) {}
inline void operator==(nsChangeHint s1, nsChangeHint s2) {}
inline void operator<=(nsChangeHint s1, nsChangeHint s2) {}
inline void operator>=(nsChangeHint s1, nsChangeHint s2) {}
// Operators on nsChangeHints
// Merge two hints, taking the union
inline nsChangeHint NS_CombineHint(nsChangeHint aH1, nsChangeHint aH2) {
return (nsChangeHint)(aH1 | aH2);
}
// Merge two hints, taking the union
inline nsChangeHint NS_SubtractHint(nsChangeHint aH1, nsChangeHint aH2) {
return (nsChangeHint)(aH1 & ~aH2);
}
// Merge the "src" hint into the "dst" hint
// Returns true iff the destination changed
inline PRBool NS_UpdateHint(nsChangeHint& aDest, nsChangeHint aSrc) {
nsChangeHint r = (nsChangeHint)(aDest | aSrc);
PRBool changed = (int)r != (int)aDest;
aDest = r;
return changed;
}
// Returns true iff the second hint contains all the hints of the first hint
inline PRBool NS_IsHintSubset(nsChangeHint aSubset, nsChangeHint aSuperSet) {
return (aSubset & aSuperSet) == aSubset;
}
// Redefine the old NS_STYLE_HINT constants in terms of the new hint structure
#define NS_STYLE_HINT_NONE \
nsChangeHint(0)
#define NS_STYLE_HINT_VISUAL \
nsChangeHint(nsChangeHint_RepaintFrame | nsChangeHint_SyncFrameView)
#define nsChangeHint_ReflowFrame \
nsChangeHint(nsChangeHint_NeedReflow | \
nsChangeHint_ClearAncestorIntrinsics | \
nsChangeHint_ClearDescendantIntrinsics | \
nsChangeHint_NeedDirtyReflow)
#define NS_STYLE_HINT_REFLOW \
nsChangeHint(NS_STYLE_HINT_VISUAL | nsChangeHint_ReflowFrame)
#define NS_STYLE_HINT_FRAMECHANGE \
nsChangeHint(NS_STYLE_HINT_REFLOW | nsChangeHint_ReconstructFrame)
/**
* |nsRestyleHint| is a bitfield for the result of
* |HasStateDependentStyle| and |HasAttributeDependentStyle|. When no
* restyling is necessary, use |nsRestyleHint(0)|.
*/
enum nsRestyleHint {
eRestyle_Self = 0x1,
eRestyle_Subtree = 0x2, /* self and descendants */
eRestyle_LaterSiblings = 0x4 /* implies "and descendants" */
};
#endif /* nsChangeHint_h___ */