LCOV - code coverage report
Current view: directory - layout/base - nsChangeHint.h (source / functions) Found Hit Coverage
Test: app.info Lines: 11 0 0.0 %
Date: 2012-06-02 Functions: 4 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2                 : /* ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is mozilla.org code.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is
      18                 :  * Netscape Communications Corporation.
      19                 :  * Portions created by the Initial Developer are Copyright (C) 1998
      20                 :  * the Initial Developer. All Rights Reserved.
      21                 :  *
      22                 :  * Contributor(s):
      23                 :  *
      24                 :  * Alternatively, the contents of this file may be used under the terms of
      25                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      26                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      27                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      28                 :  * of those above. If you wish to allow use of your version of this file only
      29                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      30                 :  * use your version of this file under the terms of the MPL, indicate your
      31                 :  * decision by deleting the provisions above and replace them with the notice
      32                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      33                 :  * the provisions above, a recipient may use your version of this file under
      34                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      35                 :  *
      36                 :  * ***** END LICENSE BLOCK ***** */
      37                 : 
      38                 : /* constants for what needs to be recomputed in response to style changes */
      39                 : 
      40                 : #ifndef nsChangeHint_h___
      41                 : #define nsChangeHint_h___
      42                 : 
      43                 : #include "prtypes.h"
      44                 : 
      45                 : // Defines for various style related constants
      46                 : 
      47                 : // For hints that don't guarantee that the change will be applied to all descendant
      48                 : // frames, style structs returning those hints from CalcDifference must have
      49                 : // their ForceCompare() return true.
      50                 : 
      51                 : enum nsChangeHint {
      52                 :   // change was visual only (e.g., COLOR=)
      53                 :   // Invalidates all descendant frames (including following
      54                 :   // placeholders to out-of-flow frames).
      55                 :   nsChangeHint_RepaintFrame = 0x01,
      56                 : 
      57                 :   // For reflow, we want flags to give us arbitrary FrameNeedsReflow behavior.
      58                 :   // just do a FrameNeedsReflow.
      59                 :   nsChangeHint_NeedReflow = 0x02,
      60                 : 
      61                 :   // Invalidate intrinsic widths on the frame's ancestors.  Must not be set
      62                 :   // without setting nsChangeHint_NeedReflow.
      63                 :   nsChangeHint_ClearAncestorIntrinsics = 0x04,
      64                 : 
      65                 :   // Invalidate intrinsic widths on the frame's descendants.  Must not be set
      66                 :   // without also setting nsChangeHint_ClearAncestorIntrinsics.
      67                 :   nsChangeHint_ClearDescendantIntrinsics = 0x08,
      68                 : 
      69                 :   // Force unconditional reflow of all descendants.  Must not be set without
      70                 :   // setting nsChangeHint_NeedReflow, but is independent of both the
      71                 :   // Clear*Intrinsics flags.
      72                 :   nsChangeHint_NeedDirtyReflow = 0x10,
      73                 : 
      74                 :   // change requires view to be updated, if there is one (e.g., clip:).
      75                 :   // Updates all descendants (including following placeholders to out-of-flows).
      76                 :   nsChangeHint_SyncFrameView = 0x20,
      77                 : 
      78                 :   // The currently shown mouse cursor needs to be updated
      79                 :   nsChangeHint_UpdateCursor = 0x40,
      80                 : 
      81                 :   /**
      82                 :    * SVG filter/mask/clip effects need to be recomputed because the URI
      83                 :    * in the filter/mask/clip-path property has changed. This wipes
      84                 :    * out cached nsSVGPropertyBase and subclasses which hold a reference to
      85                 :    * the element referenced by the URI, and a mutation observer for
      86                 :    * the DOM subtree rooted at that element. Also, for filters they store a
      87                 :    * bounding-box for the filter result so that if the filter changes we can
      88                 :    * invalidate the old covered area.
      89                 :    */
      90                 :   nsChangeHint_UpdateEffects = 0x80,
      91                 : 
      92                 :   /**
      93                 :    * Visual change only, but the change can be handled entirely by
      94                 :    * updating the layer(s) for the frame.
      95                 :    * Updates all descendants (including following placeholders to out-of-flows).
      96                 :    */
      97                 :   nsChangeHint_UpdateOpacityLayer = 0x100,
      98                 :   /**
      99                 :    * Updates all descendants. Any placeholder descendants' out-of-flows
     100                 :    * are also descendants of the transformed frame, so they're updated.
     101                 :    */
     102                 :   nsChangeHint_UpdateTransformLayer = 0x200,
     103                 : 
     104                 :   /**
     105                 :    * Change requires frame change (e.g., display:).
     106                 :    * This subsumes all the above. Reconstructs all frame descendants,
     107                 :    * including following placeholders to out-of-flows.
     108                 :    */
     109                 :   nsChangeHint_ReconstructFrame = 0x400,
     110                 : 
     111                 :   /**
     112                 :    * The frame's effect on its ancestors' overflow areas has changed,
     113                 :    * either through a change in its transform or a change in its position.
     114                 :    * Does not update any descendant frames.
     115                 :    */
     116                 :   nsChangeHint_UpdateOverflow = 0x800
     117                 : };
     118                 : 
     119                 : // Redefine these operators to return nothing. This will catch any use
     120                 : // of these operators on hints. We should not be using these operators
     121                 : // on nsChangeHints
     122                 : inline void operator<(nsChangeHint s1, nsChangeHint s2) {}
     123                 : inline void operator>(nsChangeHint s1, nsChangeHint s2) {}
     124                 : inline void operator!=(nsChangeHint s1, nsChangeHint s2) {}
     125                 : inline void operator==(nsChangeHint s1, nsChangeHint s2) {}
     126                 : inline void operator<=(nsChangeHint s1, nsChangeHint s2) {}
     127                 : inline void operator>=(nsChangeHint s1, nsChangeHint s2) {}
     128                 : 
     129                 : // Operators on nsChangeHints
     130                 : 
     131                 : // Merge two hints, taking the union
     132               0 : inline nsChangeHint NS_CombineHint(nsChangeHint aH1, nsChangeHint aH2) {
     133               0 :   return (nsChangeHint)(aH1 | aH2);
     134                 : }
     135                 : 
     136                 : // Merge two hints, taking the union
     137               0 : inline nsChangeHint NS_SubtractHint(nsChangeHint aH1, nsChangeHint aH2) {
     138               0 :   return (nsChangeHint)(aH1 & ~aH2);
     139                 : }
     140                 : 
     141                 : // Merge the "src" hint into the "dst" hint
     142                 : // Returns true iff the destination changed
     143               0 : inline bool NS_UpdateHint(nsChangeHint& aDest, nsChangeHint aSrc) {
     144               0 :   nsChangeHint r = (nsChangeHint)(aDest | aSrc);
     145               0 :   bool changed = (int)r != (int)aDest;
     146               0 :   aDest = r;
     147               0 :   return changed;
     148                 : }
     149                 : 
     150                 : // Returns true iff the second hint contains all the hints of the first hint
     151               0 : inline bool NS_IsHintSubset(nsChangeHint aSubset, nsChangeHint aSuperSet) {
     152               0 :   return (aSubset & aSuperSet) == aSubset;
     153                 : }
     154                 : 
     155                 : // Redefine the old NS_STYLE_HINT constants in terms of the new hint structure
     156                 : #define NS_STYLE_HINT_NONE \
     157                 :   nsChangeHint(0)
     158                 : #define NS_STYLE_HINT_VISUAL \
     159                 :   nsChangeHint(nsChangeHint_RepaintFrame | nsChangeHint_SyncFrameView)
     160                 : #define nsChangeHint_ReflowFrame                        \
     161                 :   nsChangeHint(nsChangeHint_NeedReflow |                \
     162                 :                nsChangeHint_ClearAncestorIntrinsics |   \
     163                 :                nsChangeHint_ClearDescendantIntrinsics | \
     164                 :                nsChangeHint_NeedDirtyReflow)
     165                 : #define NS_STYLE_HINT_REFLOW \
     166                 :   nsChangeHint(NS_STYLE_HINT_VISUAL | nsChangeHint_ReflowFrame)
     167                 : #define NS_STYLE_HINT_FRAMECHANGE \
     168                 :   nsChangeHint(NS_STYLE_HINT_REFLOW | nsChangeHint_ReconstructFrame)
     169                 : 
     170                 : /**
     171                 :  * |nsRestyleHint| is a bitfield for the result of
     172                 :  * |HasStateDependentStyle| and |HasAttributeDependentStyle|.  When no
     173                 :  * restyling is necessary, use |nsRestyleHint(0)|.
     174                 :  */
     175                 : enum nsRestyleHint {
     176                 :   eRestyle_Self = 0x1,
     177                 :   eRestyle_Subtree = 0x2, /* self and descendants */
     178                 :   eRestyle_LaterSiblings = 0x4 /* implies "and descendants" */
     179                 : };
     180                 : 
     181                 : 
     182                 : #endif /* nsChangeHint_h___ */

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