gecko-dev/layout/base/nsChangeHint.h

116 lines
4.6 KiB
C

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
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*
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
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* ***** END LICENSE BLOCK ***** */
#ifndef nsChangeHint_h___
#define nsChangeHint_h___
#include "prtypes.h"
// Defines for various style related constants
enum nsChangeHint {
nsChangeHint_RepaintFrame = 0x01, // change was visual only (e.g., COLOR=)
nsChangeHint_ReflowFrame = 0x02, // change requires reflow (e.g., WIDTH=)
nsChangeHint_SyncFrameView = 0x04, // change requires view to be updated, if there is one (e.g., clip:)
nsChangeHint_UpdateCursor = 0x08, // The currently shown mouse cursor needs to be updated
nsChangeHint_ReconstructFrame = 0x10 // change requires frame change (e.g., display:)
// This subsumes all the above
// TBD: add nsChangeHint_ForceFrameView to force frame reconstruction if the frame doesn't yet
// have a view
};
#ifdef DEBUG_roc
// 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) {}
#endif
// 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 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|. All values have an implied "and
* descendants." When no restyling is necesary, use |nsReStyleHint(0)|.
*/
enum nsReStyleHint {
eReStyle_Self = 0x1,
eReStyle_LaterSiblings = 0x2
};
#endif /* nsChangeHint_h___ */