зеркало из https://github.com/mozilla/gecko-dev.git
161 строка
6.1 KiB
C
161 строка
6.1 KiB
C
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/* constants for what needs to be recomputed in response to style changes */
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#ifndef nsChangeHint_h___
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#define nsChangeHint_h___
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#include "prtypes.h"
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// Defines for various style related constants
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enum nsChangeHint {
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// change was visual only (e.g., COLOR=)
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nsChangeHint_RepaintFrame = 0x01,
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// For reflow, we want flags to give us arbitrary FrameNeedsReflow behavior.
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// just do a FrameNeedsReflow
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nsChangeHint_NeedReflow = 0x02,
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// Invalidate intrinsic widths on the frame's ancestors. Must not be set
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// without setting nsChangeHint_NeedReflow.
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nsChangeHint_ClearAncestorIntrinsics = 0x04,
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// Invalidate intrinsic widths on the frame's descendants. Must not be set
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// without also setting nsChangeHint_ClearAncestorIntrinsics.
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nsChangeHint_ClearDescendantIntrinsics = 0x08,
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// Force unconditional reflow of all descendants. Must not be set without
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// setting nsChangeHint_NeedReflow, but is independent of both the
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// Clear*Intrinsics flags.
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nsChangeHint_NeedDirtyReflow = 0x10,
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// change requires view to be updated, if there is one (e.g., clip:)
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nsChangeHint_SyncFrameView = 0x20,
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// The currently shown mouse cursor needs to be updated
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nsChangeHint_UpdateCursor = 0x40,
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/**
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* SVG filter/mask/clip effects need to be recomputed because the URI
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* in the filter/mask/clip-path property has changed. This wipes
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* out cached nsSVGPropertyBase and subclasses which hold a reference to
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* the element referenced by the URI, and a mutation observer for
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* the DOM subtree rooted at that element. Also, for filters they store a
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* bounding-box for the filter result so that if the filter changes we can
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* invalidate the old covered area.
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*/
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nsChangeHint_UpdateEffects = 0x80,
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/**
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* Visual change only, but the change can be handled entirely by
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* updating the layer(s) for the frame.
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*/
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nsChangeHint_UpdateOpacityLayer = 0x100,
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nsChangeHint_UpdateTransformLayer = 0x200,
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// change requires frame change (e.g., display:).
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// This subsumes all the above.
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nsChangeHint_ReconstructFrame = 0x400
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};
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// Redefine these operators to return nothing. This will catch any use
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// of these operators on hints. We should not be using these operators
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// on nsChangeHints
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inline void operator<(nsChangeHint s1, nsChangeHint s2) {}
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inline void operator>(nsChangeHint s1, nsChangeHint s2) {}
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inline void operator!=(nsChangeHint s1, nsChangeHint s2) {}
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inline void operator==(nsChangeHint s1, nsChangeHint s2) {}
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inline void operator<=(nsChangeHint s1, nsChangeHint s2) {}
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inline void operator>=(nsChangeHint s1, nsChangeHint s2) {}
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// Operators on nsChangeHints
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// Merge two hints, taking the union
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inline nsChangeHint NS_CombineHint(nsChangeHint aH1, nsChangeHint aH2) {
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return (nsChangeHint)(aH1 | aH2);
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}
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// Merge two hints, taking the union
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inline nsChangeHint NS_SubtractHint(nsChangeHint aH1, nsChangeHint aH2) {
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return (nsChangeHint)(aH1 & ~aH2);
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}
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// Merge the "src" hint into the "dst" hint
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// Returns true iff the destination changed
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inline PRBool NS_UpdateHint(nsChangeHint& aDest, nsChangeHint aSrc) {
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nsChangeHint r = (nsChangeHint)(aDest | aSrc);
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PRBool changed = (int)r != (int)aDest;
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aDest = r;
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return changed;
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}
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// Returns true iff the second hint contains all the hints of the first hint
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inline PRBool NS_IsHintSubset(nsChangeHint aSubset, nsChangeHint aSuperSet) {
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return (aSubset & aSuperSet) == aSubset;
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}
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// Redefine the old NS_STYLE_HINT constants in terms of the new hint structure
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#define NS_STYLE_HINT_NONE \
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nsChangeHint(0)
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#define NS_STYLE_HINT_VISUAL \
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nsChangeHint(nsChangeHint_RepaintFrame | nsChangeHint_SyncFrameView)
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#define nsChangeHint_ReflowFrame \
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nsChangeHint(nsChangeHint_NeedReflow | \
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nsChangeHint_ClearAncestorIntrinsics | \
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nsChangeHint_ClearDescendantIntrinsics | \
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nsChangeHint_NeedDirtyReflow)
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#define NS_STYLE_HINT_REFLOW \
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nsChangeHint(NS_STYLE_HINT_VISUAL | nsChangeHint_ReflowFrame)
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#define NS_STYLE_HINT_FRAMECHANGE \
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nsChangeHint(NS_STYLE_HINT_REFLOW | nsChangeHint_ReconstructFrame)
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/**
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* |nsRestyleHint| is a bitfield for the result of
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* |HasStateDependentStyle| and |HasAttributeDependentStyle|. When no
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* restyling is necessary, use |nsRestyleHint(0)|.
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*/
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enum nsRestyleHint {
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eRestyle_Self = 0x1,
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eRestyle_Subtree = 0x2, /* self and descendants */
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eRestyle_LaterSiblings = 0x4 /* implies "and descendants" */
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};
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#endif /* nsChangeHint_h___ */
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