DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Implementation

Mercurial (a81015259a98)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287
/* -*- 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
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * 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 Communications 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
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

/* struct containing the output from nsIFrame::Reflow */

#ifndef nsHTMLReflowMetrics_h___
#define nsHTMLReflowMetrics_h___

#include <stdio.h>
#include "nsISupports.h"
#include "nsMargin.h"
#include "nsRect.h"
#include "nsBoundingMetrics.h"

//----------------------------------------------------------------------

// Option flags
#define NS_REFLOW_CALC_BOUNDING_METRICS  0x0001

/**
 * When we store overflow areas as an array of scrollable and visual
 * overflow, we use these indices.
 *
 * eOverflowType_LENGTH is needed (for gcc 4.5.*, at least) to ensure
 * that 2 is a valid value of nsOverflowType for use in
 * NS_FOR_FRAME_OVERFLOW_TYPES.
 */
enum nsOverflowType { eVisualOverflow, eScrollableOverflow,
                      eOverflowType_LENGTH };

#define NS_FOR_FRAME_OVERFLOW_TYPES(var_)                                     \
  for (nsOverflowType var_ = nsOverflowType(0); var_ < 2;                     \
       var_ = nsOverflowType(var_ + 1))

struct nsOverflowAreas {
private:
  nsRect mRects[2];
public:
  nsRect& Overflow(size_t aIndex) {
    NS_ASSERTION(0 <= aIndex && aIndex < 2, "index out of range");
    return mRects[aIndex];
  }
  const nsRect& Overflow(size_t aIndex) const {
    NS_ASSERTION(0 <= aIndex && aIndex < 2, "index out of range");
    return mRects[aIndex];
  }

  nsRect& VisualOverflow() { return mRects[eVisualOverflow]; }
  const nsRect& VisualOverflow() const { return mRects[eVisualOverflow]; }

  nsRect& ScrollableOverflow() { return mRects[eScrollableOverflow]; }
  const nsRect& ScrollableOverflow() const { return mRects[eScrollableOverflow]; }

  nsOverflowAreas() {
    // default-initializes to zero due to nsRect's default constructor
  }

  nsOverflowAreas(const nsRect& aVisualOverflow,
                  const nsRect& aScrollableOverflow)
  {
    mRects[eVisualOverflow] = aVisualOverflow;
    mRects[eScrollableOverflow] = aScrollableOverflow;
  }

  nsOverflowAreas(const nsOverflowAreas& aOther) {
    *this = aOther;
  }

  nsOverflowAreas& operator=(const nsOverflowAreas& aOther) {
    mRects[0] = aOther.mRects[0];
    mRects[1] = aOther.mRects[1];
    return *this;
  }

  bool operator==(const nsOverflowAreas& aOther) const {
    // Scrollable overflow is a point-set rectangle and visual overflow
    // is a pixel-set rectangle.
    return VisualOverflow().IsEqualInterior(aOther.VisualOverflow()) &&
           ScrollableOverflow().IsEqualEdges(aOther.ScrollableOverflow());
  }

  bool operator!=(const nsOverflowAreas& aOther) const {
    return !(*this == aOther);
  }

  nsOverflowAreas operator+(const nsPoint& aPoint) const {
    nsOverflowAreas result(*this);
    result += aPoint;
    return result;
  }

  nsOverflowAreas& operator+=(const nsPoint& aPoint) {
    mRects[0] += aPoint;
    mRects[1] += aPoint;
    return *this;
  }

  void Clear() {
    mRects[0].SetRect(0, 0, 0, 0);
    mRects[1].SetRect(0, 0, 0, 0);
  }

  // Mutates |this| by unioning both overflow areas with |aOther|.
  void UnionWith(const nsOverflowAreas& aOther);

  // Mutates |this| by unioning both overflow areas with |aRect|.
  void UnionAllWith(const nsRect& aRect);

  // Mutates |this| by setting both overflow areas to |aRect|.
  void SetAllTo(const nsRect& aRect);
};

/**
 * An nsCollapsingMargin represents a vertical collapsing margin between
 * blocks as described in section 8.3.1 of CSS2,
 * <URL: http://www.w3.org/TR/REC-CSS2/box.html#collapsing-margins >.
 *
 * All adjacent vertical margins collapse, and the resulting margin is
 * the sum of the largest positive margin included and the smallest (most
 * negative) negative margin included.
 */
struct nsCollapsingMargin {
  private:
    nscoord mMostPos;  // the largest positive margin included
    nscoord mMostNeg;  // the smallest negative margin included

  public:
    nsCollapsingMargin()
        : mMostPos(0),
          mMostNeg(0)
      {
      }

    nsCollapsingMargin(const nsCollapsingMargin& aOther)
        : mMostPos(aOther.mMostPos),
          mMostNeg(aOther.mMostNeg)
      {
      }

    bool operator==(const nsCollapsingMargin& aOther)
      {
        return mMostPos == aOther.mMostPos &&
          mMostNeg == aOther.mMostNeg;
      }

    bool operator!=(const nsCollapsingMargin& aOther)
      {
        return !(*this == aOther);
      }

    nsCollapsingMargin& operator=(const nsCollapsingMargin& aOther)
      {
        mMostPos = aOther.mMostPos;
        mMostNeg = aOther.mMostNeg;
        return *this;
      }

    void Include(nscoord aCoord)
      {
        if (aCoord > mMostPos)
          mMostPos = aCoord;
        else if (aCoord < mMostNeg)
          mMostNeg = aCoord;
      }

    void Include(const nsCollapsingMargin& aOther)
      {
        if (aOther.mMostPos > mMostPos)
          mMostPos = aOther.mMostPos;
        if (aOther.mMostNeg < mMostNeg)
          mMostNeg = aOther.mMostNeg;
      }

    void Zero()
      {
        mMostPos = 0;
        mMostNeg = 0;
      }

    bool IsZero() const
      {
        return (mMostPos == 0) && (mMostNeg == 0);
      }

    nscoord get() const
      {
        return mMostPos + mMostNeg;
      }
};

/**
 * Reflow metrics used to return the frame's desired size and alignment
 * information.
 *
 * @see #Reflow()
 */
struct nsHTMLReflowMetrics {
  nscoord width, height;    // [OUT] desired width and height (border-box)
  nscoord ascent;           // [OUT] baseline (from top), or ASK_FOR_BASELINE

  PRUint32 mFlags;

  enum { ASK_FOR_BASELINE = nscoord_MAX };

  // Metrics that _exactly_ enclose the text to allow precise MathML placements.
  // If the NS_REFLOW_CALC_BOUNDING_METRICS flag is set, then the caller is 
  // requesting that you also compute additional details about your inner
  // bounding box and italic correction. For example, the bounding box of
  // msup is the smallest rectangle that _exactly_ encloses both the text
  // of the base and the text of the superscript.
  nsBoundingMetrics mBoundingMetrics;  // [OUT]

  // Carried out bottom margin values. This is the collapsed
  // (generational) bottom margin value.
  nsCollapsingMargin mCarriedOutBottomMargin;

  // For frames that have content that overflow their content area
  // (HasOverflowAreas() is true) these rectangles represent the total
  // area of the frame including visible overflow, i.e., don't include
  // overflowing content that is hidden.  The rects are in the local
  // coordinate space of the frame, and should be at least as big as the
  // desired size. If there is no content that overflows, then the
  // overflow area is identical to the desired size and should be {0, 0,
  // width, height}.
  nsOverflowAreas mOverflowAreas;

  nsRect& VisualOverflow()
    { return mOverflowAreas.VisualOverflow(); }
  const nsRect& VisualOverflow() const
    { return mOverflowAreas.VisualOverflow(); }
  nsRect& ScrollableOverflow()
    { return mOverflowAreas.ScrollableOverflow(); }
  const nsRect& ScrollableOverflow() const
    { return mOverflowAreas.ScrollableOverflow(); }

  // Set all of mOverflowAreas to (0, 0, width, height).
  void SetOverflowAreasToDesiredBounds();

  // Union all of mOverflowAreas with (0, 0, width, height).
  void UnionOverflowAreasWithDesiredBounds();

  // XXXldb Should |aFlags| generally be passed from parent to child?
  // Some places do it, and some don't.  |aFlags| should perhaps go away
  // entirely.
  // XXX width/height/ascent are OUT parameters and so they shouldn't
  // have to be initialized, but there are some bad frame classes that
  // aren't properly setting them when returning from Reflow()...
  nsHTMLReflowMetrics(PRUint32 aFlags = 0)
    : width(0), height(0), ascent(ASK_FOR_BASELINE), mFlags(aFlags)
  {}
};

#endif /* nsHTMLReflowMetrics_h___ */