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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445
|
/*
* Copyright (C) 2003, 2004, 2005, 2006, 2007, 2009, 2010, 2011 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef InlineBox_h
#define InlineBox_h
#include "RenderBoxModelObject.h"
#include "TextDirection.h"
namespace WebCore {
class HitTestRequest;
class HitTestResult;
class RootInlineBox;
// InlineBox represents a rectangle that occurs on a line. It corresponds to
// some RenderObject (i.e., it represents a portion of that RenderObject).
class InlineBox {
public:
InlineBox(RenderObject* obj)
: m_next(0)
, m_prev(0)
, m_parent(0)
, m_renderer(obj)
, m_logicalWidth(0)
#if !ASSERT_DISABLED
, m_hasBadParent(false)
#endif
{
}
InlineBox(RenderObject* obj, FloatPoint topLeft, float logicalWidth, bool firstLine, bool constructed,
bool dirty, bool extracted, bool isHorizontal, InlineBox* next, InlineBox* prev, InlineFlowBox* parent)
: m_next(next)
, m_prev(prev)
, m_parent(parent)
, m_renderer(obj)
, m_topLeft(topLeft)
, m_logicalWidth(logicalWidth)
, m_bitfields(firstLine, constructed, dirty, extracted, isHorizontal)
#if !ASSERT_DISABLED
, m_hasBadParent(false)
#endif
{
}
virtual ~InlineBox();
virtual void destroy(RenderArena*);
virtual void deleteLine(RenderArena*);
virtual void extractLine();
virtual void attachLine();
virtual bool isLineBreak() const { return false; }
virtual void adjustPosition(float dx, float dy);
void adjustLogicalPosition(float deltaLogicalLeft, float deltaLogicalTop)
{
if (isHorizontal())
adjustPosition(deltaLogicalLeft, deltaLogicalTop);
else
adjustPosition(deltaLogicalTop, deltaLogicalLeft);
}
void adjustLineDirectionPosition(float delta)
{
if (isHorizontal())
adjustPosition(delta, 0);
else
adjustPosition(0, delta);
}
void adjustBlockDirectionPosition(float delta)
{
if (isHorizontal())
adjustPosition(0, delta);
else
adjustPosition(delta, 0);
}
virtual void paint(PaintInfo&, const LayoutPoint&, LayoutUnit lineTop, LayoutUnit lineBottom);
virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit lineTop, LayoutUnit lineBottom);
// Overloaded new operator.
void* operator new(size_t, RenderArena*);
// Overridden to prevent the normal delete from being called.
void operator delete(void*, size_t);
private:
// The normal operator new is disallowed.
void* operator new(size_t) throw();
public:
#ifndef NDEBUG
void showTreeForThis() const;
void showLineTreeForThis() const;
virtual void showBox(int = 0) const;
virtual void showLineTreeAndMark(const InlineBox* = 0, const char* = 0, const InlineBox* = 0, const char* = 0, const RenderObject* = 0, int = 0) const;
virtual const char* boxName() const;
#endif
bool isText() const { return m_bitfields.isText(); }
void setIsText(bool isText) { m_bitfields.setIsText(isText); }
virtual bool isInlineFlowBox() const { return false; }
virtual bool isInlineTextBox() const { return false; }
virtual bool isRootInlineBox() const { return false; }
#if ENABLE(SVG)
virtual bool isSVGInlineTextBox() const { return false; }
virtual bool isSVGInlineFlowBox() const { return false; }
virtual bool isSVGRootInlineBox() const { return false; }
#endif
bool hasVirtualLogicalHeight() const { return m_bitfields.hasVirtualLogicalHeight(); }
void setHasVirtualLogicalHeight() { m_bitfields.setHasVirtualLogicalHeight(true); }
virtual float virtualLogicalHeight() const
{
ASSERT_NOT_REACHED();
return 0;
}
bool isHorizontal() const { return m_bitfields.isHorizontal(); }
void setIsHorizontal(bool isHorizontal) { m_bitfields.setIsHorizontal(isHorizontal); }
virtual FloatRect calculateBoundaries() const
{
ASSERT_NOT_REACHED();
return FloatRect();
}
bool isConstructed() { return m_bitfields.constructed(); }
virtual void setConstructed() { m_bitfields.setConstructed(true); }
void setExtracted(bool extracted = true) { m_bitfields.setExtracted(extracted); }
void setFirstLineStyleBit(bool firstLine) { m_bitfields.setFirstLine(firstLine); }
bool isFirstLineStyle() const { return m_bitfields.firstLine(); }
void remove();
InlineBox* nextOnLine() const { return m_next; }
InlineBox* prevOnLine() const { return m_prev; }
void setNextOnLine(InlineBox* next)
{
ASSERT(m_parent || !next);
m_next = next;
}
void setPrevOnLine(InlineBox* prev)
{
ASSERT(m_parent || !prev);
m_prev = prev;
}
bool nextOnLineExists() const;
virtual bool isLeaf() const { return true; }
InlineBox* nextLeafChild() const;
InlineBox* prevLeafChild() const;
// Helper functions for editing and hit-testing code.
// FIXME: These two functions should be moved to RenderedPosition once the code to convert between
// Position and inline box, offset pair is moved to RenderedPosition.
InlineBox* nextLeafChildIgnoringLineBreak() const;
InlineBox* prevLeafChildIgnoringLineBreak() const;
RenderObject* renderer() const { return m_renderer; }
InlineFlowBox* parent() const
{
ASSERT(!m_hasBadParent);
return m_parent;
}
void setParent(InlineFlowBox* par) { m_parent = par; }
const RootInlineBox* root() const;
RootInlineBox* root();
// x() is the left side of the box in the containing block's coordinate system.
void setX(float x) { m_topLeft.setX(x); }
float x() const { return m_topLeft.x(); }
float left() const { return m_topLeft.x(); }
// y() is the top side of the box in the containing block's coordinate system.
void setY(float y) { m_topLeft.setY(y); }
float y() const { return m_topLeft.y(); }
float top() const { return m_topLeft.y(); }
const FloatPoint& topLeft() const { return m_topLeft; }
float width() const { return isHorizontal() ? logicalWidth() : logicalHeight(); }
float height() const { return isHorizontal() ? logicalHeight() : logicalWidth(); }
FloatSize size() const { return FloatSize(width(), height()); }
float right() const { return left() + width(); }
float bottom() const { return top() + height(); }
// The logicalLeft position is the left edge of the line box in a horizontal line and the top edge in a vertical line.
float logicalLeft() const { return isHorizontal() ? m_topLeft.x() : m_topLeft.y(); }
float logicalRight() const { return logicalLeft() + logicalWidth(); }
void setLogicalLeft(float left)
{
if (isHorizontal())
setX(left);
else
setY(left);
}
int pixelSnappedLogicalLeft() const { return logicalLeft(); }
int pixelSnappedLogicalRight() const { return ceilf(logicalRight()); }
int pixelSnappedLogicalTop() const { return logicalTop(); }
int pixelSnappedLogicalBottom() const { return ceilf(logicalBottom()); }
// The logicalTop[ position is the top edge of the line box in a horizontal line and the left edge in a vertical line.
float logicalTop() const { return isHorizontal() ? m_topLeft.y() : m_topLeft.x(); }
float logicalBottom() const { return logicalTop() + logicalHeight(); }
void setLogicalTop(float top)
{
if (isHorizontal())
setY(top);
else
setX(top);
}
// The logical width is our extent in the line's overall inline direction, i.e., width for horizontal text and height for vertical text.
void setLogicalWidth(float w) { m_logicalWidth = w; }
float logicalWidth() const { return m_logicalWidth; }
// The logical height is our extent in the block flow direction, i.e., height for horizontal text and width for vertical text.
float logicalHeight() const;
FloatRect logicalFrameRect() const { return isHorizontal() ? FloatRect(m_topLeft.x(), m_topLeft.y(), m_logicalWidth, logicalHeight()) : FloatRect(m_topLeft.y(), m_topLeft.x(), m_logicalWidth, logicalHeight()); }
virtual int baselinePosition(FontBaseline baselineType) const;
virtual LayoutUnit lineHeight() const;
virtual int caretMinOffset() const;
virtual int caretMaxOffset() const;
unsigned char bidiLevel() const { return m_bitfields.bidiEmbeddingLevel(); }
void setBidiLevel(unsigned char level) { m_bitfields.setBidiEmbeddingLevel(level); }
TextDirection direction() const { return bidiLevel() % 2 ? RTL : LTR; }
bool isLeftToRightDirection() const { return direction() == LTR; }
int caretLeftmostOffset() const { return isLeftToRightDirection() ? caretMinOffset() : caretMaxOffset(); }
int caretRightmostOffset() const { return isLeftToRightDirection() ? caretMaxOffset() : caretMinOffset(); }
virtual void clearTruncation() { }
bool isDirty() const { return m_bitfields.dirty(); }
virtual void markDirty(bool dirty = true) { m_bitfields.setDirty(dirty); }
virtual void dirtyLineBoxes();
virtual RenderObject::SelectionState selectionState();
virtual bool canAccommodateEllipsis(bool ltr, int blockEdge, int ellipsisWidth) const;
// visibleLeftEdge, visibleRightEdge are in the parent's coordinate system.
virtual float placeEllipsisBox(bool ltr, float visibleLeftEdge, float visibleRightEdge, float ellipsisWidth, float &truncatedWidth, bool&);
#if !ASSERT_DISABLED
void setHasBadParent();
#endif
int expansion() const { return m_bitfields.expansion(); }
bool visibleToHitTesting() const { return renderer()->style()->visibility() == VISIBLE && renderer()->style()->pointerEvents() != PE_NONE; }
EVerticalAlign verticalAlign() const { return renderer()->style(m_bitfields.firstLine())->verticalAlign(); }
// Use with caution! The type is not checked!
RenderBoxModelObject* boxModelObject() const
{
if (!m_renderer->isText())
return toRenderBoxModelObject(m_renderer);
return 0;
}
FloatPoint locationIncludingFlipping();
void flipForWritingMode(FloatRect&);
FloatPoint flipForWritingMode(const FloatPoint&);
void flipForWritingMode(LayoutRect&);
LayoutPoint flipForWritingMode(const LayoutPoint&);
bool knownToHaveNoOverflow() const { return m_bitfields.knownToHaveNoOverflow(); }
void clearKnownToHaveNoOverflow();
bool dirOverride() const { return m_bitfields.dirOverride(); }
void setDirOverride(bool dirOverride) { m_bitfields.setDirOverride(dirOverride); }
private:
InlineBox* m_next; // The next element on the same line as us.
InlineBox* m_prev; // The previous element on the same line as us.
InlineFlowBox* m_parent; // The box that contains us.
public:
RenderObject* m_renderer;
FloatPoint m_topLeft;
float m_logicalWidth;
#define ADD_BOOLEAN_BITFIELD(name, Name) \
private:\
unsigned m_##name : 1;\
public:\
bool name() const { return m_##name; }\
void set##Name(bool name) { m_##name = name; }\
class InlineBoxBitfields {
public:
InlineBoxBitfields(bool firstLine = false, bool constructed = false, bool dirty = false, bool extracted = false, bool isHorizontal = true)
: m_firstLine(firstLine)
, m_constructed(constructed)
, m_bidiEmbeddingLevel(0)
, m_dirty(dirty)
, m_extracted(extracted)
, m_hasVirtualLogicalHeight(false)
, m_isHorizontal(isHorizontal)
, m_endsWithBreak(false)
, m_hasSelectedChildrenOrCanHaveLeadingExpansion(false)
, m_knownToHaveNoOverflow(true)
, m_hasEllipsisBoxOrHyphen(false)
, m_dirOverride(false)
, m_isText(false)
, m_determinedIfNextOnLineExists(false)
, m_nextOnLineExists(false)
, m_expansion(0)
{
}
// Some of these bits are actually for subclasses and moved here to compact the structures.
// for this class
ADD_BOOLEAN_BITFIELD(firstLine, FirstLine);
ADD_BOOLEAN_BITFIELD(constructed, Constructed);
private:
unsigned m_bidiEmbeddingLevel : 6; // The maximium bidi level is 62: http://unicode.org/reports/tr9/#Explicit_Levels_and_Directions
public:
unsigned char bidiEmbeddingLevel() const { return m_bidiEmbeddingLevel; }
void setBidiEmbeddingLevel(unsigned char bidiEmbeddingLevel) { m_bidiEmbeddingLevel = bidiEmbeddingLevel; }
ADD_BOOLEAN_BITFIELD(dirty, Dirty);
ADD_BOOLEAN_BITFIELD(extracted, Extracted);
ADD_BOOLEAN_BITFIELD(hasVirtualLogicalHeight, HasVirtualLogicalHeight);
ADD_BOOLEAN_BITFIELD(isHorizontal, IsHorizontal);
// for RootInlineBox
ADD_BOOLEAN_BITFIELD(endsWithBreak, EndsWithBreak); // Whether the line ends with a <br>.
// shared between RootInlineBox and InlineTextBox
ADD_BOOLEAN_BITFIELD(hasSelectedChildrenOrCanHaveLeadingExpansion, HasSelectedChildrenOrCanHaveLeadingExpansion);
ADD_BOOLEAN_BITFIELD(knownToHaveNoOverflow, KnownToHaveNoOverflow);
ADD_BOOLEAN_BITFIELD(hasEllipsisBoxOrHyphen, HasEllipsisBoxOrHyphen);
// for InlineTextBox
ADD_BOOLEAN_BITFIELD(dirOverride, DirOverride);
ADD_BOOLEAN_BITFIELD(isText, IsText); // Whether or not this object represents text with a non-zero height. Includes non-image list markers, text boxes.
private:
mutable unsigned m_determinedIfNextOnLineExists : 1;
public:
bool determinedIfNextOnLineExists() const { return m_determinedIfNextOnLineExists; }
void setDeterminedIfNextOnLineExists(bool determinedIfNextOnLineExists) const { m_determinedIfNextOnLineExists = determinedIfNextOnLineExists; }
private:
mutable unsigned m_nextOnLineExists : 1;
public:
bool nextOnLineExists() const { return m_nextOnLineExists; }
void setNextOnLineExists(bool nextOnLineExists) const { m_nextOnLineExists = nextOnLineExists; }
private:
signed m_expansion : 12; // for justified text
public:
signed expansion() const { return m_expansion; }
void setExpansion(signed expansion) { m_expansion = expansion; }
};
#undef ADD_BOOLEAN_BITFIELD
private:
InlineBoxBitfields m_bitfields;
protected:
// For RootInlineBox
bool endsWithBreak() const { return m_bitfields.endsWithBreak(); }
void setEndsWithBreak(bool endsWithBreak) { m_bitfields.setEndsWithBreak(endsWithBreak); }
bool hasEllipsisBox() const { return m_bitfields.hasEllipsisBoxOrHyphen(); }
bool hasSelectedChildren() const { return m_bitfields.hasSelectedChildrenOrCanHaveLeadingExpansion(); }
void setHasSelectedChildren(bool hasSelectedChildren) { m_bitfields.setHasSelectedChildrenOrCanHaveLeadingExpansion(hasSelectedChildren); }
void setHasEllipsisBox(bool hasEllipsisBox) { m_bitfields.setHasEllipsisBoxOrHyphen(hasEllipsisBox); }
// For InlineTextBox
bool hasHyphen() const { return m_bitfields.hasEllipsisBoxOrHyphen(); }
void setHasHyphen(bool hasHyphen) { m_bitfields.setHasEllipsisBoxOrHyphen(hasHyphen); }
bool canHaveLeadingExpansion() const { return m_bitfields.hasSelectedChildrenOrCanHaveLeadingExpansion(); }
void setCanHaveLeadingExpansion(bool canHaveLeadingExpansion) { m_bitfields.setHasSelectedChildrenOrCanHaveLeadingExpansion(canHaveLeadingExpansion); }
signed expansion() { return m_bitfields.expansion(); }
void setExpansion(signed expansion) { m_bitfields.setExpansion(expansion); }
// For InlineFlowBox and InlineTextBox
bool extracted() const { return m_bitfields.extracted(); }
#if !ASSERT_DISABLED
private:
bool m_hasBadParent;
#endif
};
#if ASSERT_DISABLED
inline InlineBox::~InlineBox()
{
}
#endif
#if !ASSERT_DISABLED
inline void InlineBox::setHasBadParent()
{
m_hasBadParent = true;
}
#endif
} // namespace WebCore
#ifndef NDEBUG
// Outside the WebCore namespace for ease of invocation from gdb.
void showTree(const WebCore::InlineBox*);
void showLineTree(const WebCore::InlineBox*);
#endif
#endif // InlineBox_h
|