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comparison: layout/generic/nsBlockFrame.h

layout/generic/nsBlockFrame.h

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1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 // vim:cindent:ts=2:et:sw=2:
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6
7 /*
8 * rendering object for CSS display:block, inline-block, and list-item
9 * boxes, also used for various anonymous boxes
10 */
11
12 #ifndef nsBlockFrame_h___
13 #define nsBlockFrame_h___
14
15 #include "nsContainerFrame.h"
16 #include "nsHTMLParts.h"
17 #include "nsLineBox.h"
18 #include "nsCSSPseudoElements.h"
19 #include "nsStyleSet.h"
20 #include "nsFloatManager.h"
21
22 enum LineReflowStatus {
23 // The line was completely reflowed and fit in available width, and we should
24 // try to pull up content from the next line if possible.
25 LINE_REFLOW_OK,
26 // The line was completely reflowed and fit in available width, but we should
27 // not try to pull up content from the next line.
28 LINE_REFLOW_STOP,
29 // We need to reflow the line again at its current vertical position. The
30 // new reflow should not try to pull up any frames from the next line.
31 LINE_REFLOW_REDO_NO_PULL,
32 // We need to reflow the line again using the floats from its height
33 // this reflow, since its height made it hit floats that were not
34 // adjacent to its top.
35 LINE_REFLOW_REDO_MORE_FLOATS,
36 // We need to reflow the line again at a lower vertical postion where there
37 // may be more horizontal space due to different float configuration.
38 LINE_REFLOW_REDO_NEXT_BAND,
39 // The line did not fit in the available vertical space. Try pushing it to
40 // the next page or column if it's not the first line on the current page/column.
41 LINE_REFLOW_TRUNCATED
42 };
43
44 class nsBlockReflowState;
45 class nsBlockInFlowLineIterator;
46 class nsBulletFrame;
47 class nsFirstLineFrame;
48
49 /**
50 * Some invariants:
51 * -- The overflow out-of-flows list contains the out-of-
52 * flow frames whose placeholders are in the overflow list.
53 * -- A given piece of content has at most one placeholder
54 * frame in a block's normal child list.
55 * -- While a block is being reflowed, and from then until
56 * its next-in-flow is reflowed it may have a
57 * PushedFloatProperty frame property that points to
58 * an nsFrameList. This list contains continuations for
59 * floats whose prev-in-flow is in the block's regular float
60 * list and first-in-flows of floats that did not fit, but
61 * whose placeholders are in the block or one of its
62 * prev-in-flows.
63 * -- In all these frame lists, if there are two frames for
64 * the same content appearing in the list, then the frames
65 * appear with the prev-in-flow before the next-in-flow.
66 * -- While reflowing a block, its overflow line list
67 * will usually be empty but in some cases will have lines
68 * (while we reflow the block at its shrink-wrap width).
69 * In this case any new overflowing content must be
70 * prepended to the overflow lines.
71 */
72
73 typedef nsContainerFrame nsBlockFrameSuper;
74
75 /*
76 * Base class for block and inline frames.
77 * The block frame has an additional child list, kAbsoluteList, which
78 * contains the absolutely positioned frames.
79 */
80 class nsBlockFrame : public nsBlockFrameSuper
81 {
82 public:
83 NS_DECL_QUERYFRAME_TARGET(nsBlockFrame)
84 NS_DECL_FRAMEARENA_HELPERS
85
86 typedef nsLineList::iterator line_iterator;
87 typedef nsLineList::const_iterator const_line_iterator;
88 typedef nsLineList::reverse_iterator reverse_line_iterator;
89 typedef nsLineList::const_reverse_iterator const_reverse_line_iterator;
90
91 line_iterator begin_lines() { return mLines.begin(); }
92 line_iterator end_lines() { return mLines.end(); }
93 const_line_iterator begin_lines() const { return mLines.begin(); }
94 const_line_iterator end_lines() const { return mLines.end(); }
95 reverse_line_iterator rbegin_lines() { return mLines.rbegin(); }
96 reverse_line_iterator rend_lines() { return mLines.rend(); }
97 const_reverse_line_iterator rbegin_lines() const { return mLines.rbegin(); }
98 const_reverse_line_iterator rend_lines() const { return mLines.rend(); }
99 line_iterator line(nsLineBox* aList) { return mLines.begin(aList); }
100 reverse_line_iterator rline(nsLineBox* aList) { return mLines.rbegin(aList); }
101
102 friend nsIFrame* NS_NewBlockFrame(nsIPresShell* aPresShell, nsStyleContext* aContext, nsFrameState aFlags);
103
104 // nsQueryFrame
105 NS_DECL_QUERYFRAME
106
107 // nsIFrame
108 virtual void Init(nsIContent* aContent,
109 nsIFrame* aParent,
110 nsIFrame* aPrevInFlow) MOZ_OVERRIDE;
111 virtual nsresult SetInitialChildList(ChildListID aListID,
112 nsFrameList& aChildList) MOZ_OVERRIDE;
113 virtual nsresult AppendFrames(ChildListID aListID,
114 nsFrameList& aFrameList) MOZ_OVERRIDE;
115 virtual nsresult InsertFrames(ChildListID aListID,
116 nsIFrame* aPrevFrame,
117 nsFrameList& aFrameList) MOZ_OVERRIDE;
118 virtual nsresult RemoveFrame(ChildListID aListID,
119 nsIFrame* aOldFrame) MOZ_OVERRIDE;
120 virtual const nsFrameList& GetChildList(ChildListID aListID) const MOZ_OVERRIDE;
121 virtual void GetChildLists(nsTArray<ChildList>* aLists) const MOZ_OVERRIDE;
122 virtual nscoord GetBaseline() const MOZ_OVERRIDE;
123 virtual nscoord GetCaretBaseline() const MOZ_OVERRIDE;
124 virtual void DestroyFrom(nsIFrame* aDestructRoot) MOZ_OVERRIDE;
125 virtual nsSplittableType GetSplittableType() const MOZ_OVERRIDE;
126 virtual bool IsFloatContainingBlock() const MOZ_OVERRIDE;
127 virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
128 const nsRect& aDirtyRect,
129 const nsDisplayListSet& aLists) MOZ_OVERRIDE;
130 virtual nsIAtom* GetType() const MOZ_OVERRIDE;
131 virtual bool IsFrameOfType(uint32_t aFlags) const MOZ_OVERRIDE
132 {
133 return nsContainerFrame::IsFrameOfType(aFlags &
134 ~(nsIFrame::eCanContainOverflowContainers |
135 nsIFrame::eBlockFrame));
136 }
137
138 virtual void InvalidateFrame(uint32_t aDisplayItemKey = 0) MOZ_OVERRIDE;
139 virtual void InvalidateFrameWithRect(const nsRect& aRect, uint32_t aDisplayItemKey = 0) MOZ_OVERRIDE;
140
141 #ifdef DEBUG_FRAME_DUMP
142 void List(FILE* out = stderr, const char* aPrefix = "", uint32_t aFlags = 0) const MOZ_OVERRIDE;
143 virtual nsresult GetFrameName(nsAString& aResult) const MOZ_OVERRIDE;
144 #endif
145
146 #ifdef DEBUG
147 virtual nsFrameState GetDebugStateBits() const MOZ_OVERRIDE;
148 #endif
149
150 #ifdef ACCESSIBILITY
151 virtual mozilla::a11y::AccType AccessibleType() MOZ_OVERRIDE;
152 #endif
153
154 // line cursor methods to speed up searching for the line(s)
155 // containing a point. The basic idea is that we set the cursor
156 // property if the lines' overflowArea.VisualOverflow().ys and
157 // overflowArea.VisualOverflow().yMosts are non-decreasing
158 // (considering only non-empty overflowArea.VisualOverflow()s; empty
159 // overflowArea.VisualOverflow()s never participate in event handling
160 // or painting), and the block has sufficient number of lines. The
161 // cursor property points to a "recently used" line. If we get a
162 // series of requests that work on lines
163 // "near" the cursor, then we can find those nearby lines quickly by
164 // starting our search at the cursor.
165
166 // Clear out line cursor because we're disturbing the lines (i.e., Reflow)
167 void ClearLineCursor();
168 // Get the first line that might contain y-coord 'y', or nullptr if you must search
169 // all lines. If nonnull is returned then we guarantee that the lines'
170 // combinedArea.ys and combinedArea.yMosts are non-decreasing.
171 // The actual line returned might not contain 'y', but if not, it is guaranteed
172 // to be before any line which does contain 'y'.
173 nsLineBox* GetFirstLineContaining(nscoord y);
174 // Set the line cursor to our first line. Only call this if you
175 // guarantee that the lines' combinedArea.ys and combinedArea.yMosts
176 // are non-decreasing.
177 void SetupLineCursor();
178
179 virtual void ChildIsDirty(nsIFrame* aChild) MOZ_OVERRIDE;
180 virtual bool IsVisibleInSelection(nsISelection* aSelection) MOZ_OVERRIDE;
181
182 virtual bool IsEmpty() MOZ_OVERRIDE;
183 virtual bool CachedIsEmpty() MOZ_OVERRIDE;
184 virtual bool IsSelfEmpty() MOZ_OVERRIDE;
185
186 // Given that we have a bullet, does it actually draw something, i.e.,
187 // do we have either a 'list-style-type' or 'list-style-image' that is
188 // not 'none'?
189 bool BulletIsEmpty() const;
190
191 /**
192 * Return the bullet text equivalent.
193 */
194 void GetBulletText(nsAString& aText) const;
195
196 /**
197 * Return true if there's a bullet.
198 */
199 bool HasBullet() const {
200 return HasOutsideBullet() || HasInsideBullet();
201 }
202
203 /**
204 * @return true if this frame has an inside bullet frame.
205 */
206 bool HasInsideBullet() const {
207 return 0 != (mState & NS_BLOCK_FRAME_HAS_INSIDE_BULLET);
208 }
209
210 /**
211 * @return true if this frame has an outside bullet frame.
212 */
213 bool HasOutsideBullet() const {
214 return 0 != (mState & NS_BLOCK_FRAME_HAS_OUTSIDE_BULLET);
215 }
216
217 /**
218 * @return the bullet frame or nullptr if we don't have one.
219 */
220 nsBulletFrame* GetBullet() const {
221 nsBulletFrame* outside = GetOutsideBullet();
222 return outside ? outside : GetInsideBullet();
223 }
224
225 virtual void MarkIntrinsicWidthsDirty() MOZ_OVERRIDE;
226 private:
227 void CheckIntrinsicCacheAgainstShrinkWrapState();
228 public:
229 virtual nscoord GetMinWidth(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE;
230 virtual nscoord GetPrefWidth(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE;
231
232 virtual nsRect ComputeTightBounds(gfxContext* aContext) const MOZ_OVERRIDE;
233
234 virtual nsresult GetPrefWidthTightBounds(nsRenderingContext* aContext,
235 nscoord* aX,
236 nscoord* aXMost) MOZ_OVERRIDE;
237
238 /**
239 * Compute the final height of this frame.
240 *
241 * @param aReflowState Data structure passed from parent during reflow.
242 * @param aReflowStatus A pointed to the reflow status for when we're finished
243 * doing reflow. this will get set appropriately if the height causes
244 * us to exceed the current available (page) height.
245 * @param aContentHeight The height of content, precomputed outside of this
246 * function. The final height that is used in aMetrics will be set to
247 * either this or the available height, whichever is larger, in the
248 * case where our available height is constrained, and we overflow that
249 * available height.
250 * @param aBorderPadding The margins representing the border padding for block
251 * frames. Can be 0.
252 * @param aMetrics Out parameter for final height. Taken as an
253 * nsHTMLReflowMetrics object so that aMetrics can be passed in
254 * directly during reflow.
255 * @param aConsumed The height already consumed by our previous-in-flows.
256 */
257 void ComputeFinalHeight(const nsHTMLReflowState& aReflowState,
258 nsReflowStatus* aStatus,
259 nscoord aContentHeight,
260 const nsMargin& aBorderPadding,
261 nsHTMLReflowMetrics& aMetrics,
262 nscoord aConsumed);
263
264 virtual nsresult Reflow(nsPresContext* aPresContext,
265 nsHTMLReflowMetrics& aDesiredSize,
266 const nsHTMLReflowState& aReflowState,
267 nsReflowStatus& aStatus) MOZ_OVERRIDE;
268
269 virtual nsresult AttributeChanged(int32_t aNameSpaceID,
270 nsIAtom* aAttribute,
271 int32_t aModType) MOZ_OVERRIDE;
272
273 /**
274 * Move any frames on our overflow list to the end of our principal list.
275 * @return true if there were any overflow frames
276 */
277 virtual bool DrainSelfOverflowList() MOZ_OVERRIDE;
278
279 virtual nsresult StealFrame(nsIFrame* aChild,
280 bool aForceNormal = false) MOZ_OVERRIDE;
281
282 virtual void DeleteNextInFlowChild(nsIFrame* aNextInFlow,
283 bool aDeletingEmptyFrames) MOZ_OVERRIDE;
284
285 /**
286 * This is a special method that allows a child class of nsBlockFrame to
287 * return a special, customized nsStyleText object to the nsLineLayout
288 * constructor. It is used when the nsBlockFrame child needs to specify its
289 * custom rendering style.
290 */
291 virtual const nsStyleText* StyleTextForLineLayout();
292
293 /**
294 * Determines whether the collapsed margin carried out of the last
295 * line includes the margin-top of a line with clearance (in which
296 * case we must avoid collapsing that margin with our bottom margin)
297 */
298 bool CheckForCollapsedBottomMarginFromClearanceLine();
299
300 static nsresult GetCurrentLine(nsBlockReflowState *aState, nsLineBox **aOutCurrentLine);
301
302 /**
303 * Determine if this block is a margin root at the top/bottom edges.
304 */
305 void IsMarginRoot(bool* aTopMarginRoot, bool* aBottomMarginRoot);
306
307 static bool BlockNeedsFloatManager(nsIFrame* aBlock);
308
309 /**
310 * Returns whether aFrame is a block frame that will wrap its contents
311 * around floats intruding on it from the outside. (aFrame need not
312 * be a block frame, but if it's not, the result will be false.)
313 */
314 static bool BlockCanIntersectFloats(nsIFrame* aFrame);
315
316 /**
317 * Returns the width that needs to be cleared past floats for blocks
318 * that cannot intersect floats. aState must already have
319 * GetAvailableSpace called on it for the vertical position that we
320 * care about (which need not be its current mY)
321 */
322 struct ReplacedElementWidthToClear {
323 nscoord marginLeft, borderBoxWidth, marginRight;
324 nscoord MarginBoxWidth() const
325 { return marginLeft + borderBoxWidth + marginRight; }
326 };
327 static ReplacedElementWidthToClear
328 WidthToClearPastFloats(nsBlockReflowState& aState,
329 const nsRect& aFloatAvailableSpace,
330 nsIFrame* aFrame);
331
332 /**
333 * Creates a contination for aFloat and adds it to the list of overflow floats.
334 * Also updates aState.mReflowStatus to include the float's incompleteness.
335 * Must only be called while this block frame is in reflow.
336 * aFloatStatus must be the float's true, unmodified reflow status.
337 *
338 */
339 nsresult SplitFloat(nsBlockReflowState& aState,
340 nsIFrame* aFloat,
341 nsReflowStatus aFloatStatus);
342
343 /**
344 * Walks up the frame tree, starting with aCandidate, and returns the first
345 * block frame that it encounters.
346 */
347 static nsBlockFrame* GetNearestAncestorBlock(nsIFrame* aCandidate);
348
349 struct FrameLines {
350 nsLineList mLines;
351 nsFrameList mFrames;
352 };
353
354 protected:
355 nsBlockFrame(nsStyleContext* aContext)
356 : nsContainerFrame(aContext)
357 , mMinWidth(NS_INTRINSIC_WIDTH_UNKNOWN)
358 , mPrefWidth(NS_INTRINSIC_WIDTH_UNKNOWN)
359 {
360 #ifdef DEBUG
361 InitDebugFlags();
362 #endif
363 }
364 virtual ~nsBlockFrame();
365
366 #ifdef DEBUG
367 already_AddRefed<nsStyleContext> GetFirstLetterStyle(nsPresContext* aPresContext)
368 {
369 return aPresContext->StyleSet()->
370 ProbePseudoElementStyle(mContent->AsElement(),
371 nsCSSPseudoElements::ePseudo_firstLetter,
372 mStyleContext);
373 }
374 #endif
375
376 NS_DECLARE_FRAME_PROPERTY(LineCursorProperty, nullptr)
377 nsLineBox* GetLineCursor() {
378 return (GetStateBits() & NS_BLOCK_HAS_LINE_CURSOR) ?
379 static_cast<nsLineBox*>(Properties().Get(LineCursorProperty())) : nullptr;
380 }
381
382 nsLineBox* NewLineBox(nsIFrame* aFrame, bool aIsBlock) {
383 return NS_NewLineBox(PresContext()->PresShell(), aFrame, aIsBlock);
384 }
385 nsLineBox* NewLineBox(nsLineBox* aFromLine, nsIFrame* aFrame, int32_t aCount) {
386 return NS_NewLineBox(PresContext()->PresShell(), aFromLine, aFrame, aCount);
387 }
388 void FreeLineBox(nsLineBox* aLine) {
389 if (aLine == GetLineCursor()) {
390 ClearLineCursor();
391 }
392 aLine->Destroy(PresContext()->PresShell());
393 }
394 /**
395 * Helper method for StealFrame.
396 */
397 void RemoveFrameFromLine(nsIFrame* aChild, nsLineList::iterator aLine,
398 nsFrameList& aFrameList, nsLineList& aLineList);
399
400 void TryAllLines(nsLineList::iterator* aIterator,
401 nsLineList::iterator* aStartIterator,
402 nsLineList::iterator* aEndIterator,
403 bool* aInOverflowLines,
404 FrameLines** aOverflowLines);
405
406 void SetFlags(nsFrameState aFlags) {
407 mState &= ~NS_BLOCK_FLAGS_MASK;
408 mState |= aFlags;
409 }
410
411 /** move the frames contained by aLine by aDY
412 * if aLine is a block, its child floats are added to the state manager
413 */
414 void SlideLine(nsBlockReflowState& aState,
415 nsLineBox* aLine, nscoord aDY);
416
417 void ComputeFinalSize(const nsHTMLReflowState& aReflowState,
418 nsBlockReflowState& aState,
419 nsHTMLReflowMetrics& aMetrics,
420 nscoord* aBottomEdgeOfChildren);
421
422 void ComputeOverflowAreas(const nsRect& aBounds,
423 const nsStyleDisplay* aDisplay,
424 nscoord aBottomEdgeOfChildren,
425 nsOverflowAreas& aOverflowAreas);
426
427 /**
428 * Add the frames in aFrameList to this block after aPrevSibling.
429 * This block thinks in terms of lines, but the frame construction code
430 * knows nothing about lines at all so we need to find the line that
431 * contains aPrevSibling and add aFrameList after aPrevSibling on that line.
432 * New lines are created as necessary to handle block data in aFrameList.
433 * This function will clear aFrameList.
434 */
435 void AddFrames(nsFrameList& aFrameList, nsIFrame* aPrevSibling);
436
437 /**
438 * Perform Bidi resolution on this frame
439 */
440 nsresult ResolveBidi();
441
442 /**
443 * Test whether the frame is a form control in a visual Bidi page.
444 * This is necessary for backwards-compatibility, because most visual
445 * pages use logical order for form controls so that they will
446 * display correctly on native widgets in OSs with Bidi support
447 * @param aPresContext the pres context
448 * @return whether the frame is a BIDI form control
449 */
450 bool IsVisualFormControl(nsPresContext* aPresContext);
451
452 public:
453 /**
454 * Does all the real work for removing aDeletedFrame
455 * -- finds the line containing aDeletedFrame
456 * -- removes all aDeletedFrame next-in-flows (or all continuations,
457 * if REMOVE_FIXED_CONTINUATIONS is given)
458 * -- marks lines dirty as needed
459 * -- marks textruns dirty (unless FRAMES_ARE_EMPTY is given, in which
460 * case textruns do not need to be dirtied)
461 * -- destroys all removed frames
462 */
463 enum {
464 REMOVE_FIXED_CONTINUATIONS = 0x02,
465 FRAMES_ARE_EMPTY = 0x04
466 };
467 nsresult DoRemoveFrame(nsIFrame* aDeletedFrame, uint32_t aFlags);
468
469 void ReparentFloats(nsIFrame* aFirstFrame, nsBlockFrame* aOldParent,
470 bool aReparentSiblings);
471
472 virtual bool UpdateOverflow() MOZ_OVERRIDE;
473
474 /** Load all of aFrame's floats into the float manager iff aFrame is not a
475 * block formatting context. Handles all necessary float manager translations;
476 * assumes float manager is in aFrame's parent's coord system.
477 * Safe to call on non-blocks (does nothing).
478 */
479 static void RecoverFloatsFor(nsIFrame* aFrame,
480 nsFloatManager& aFloatManager);
481
482 /**
483 * Determine if we have any pushed floats from a previous continuation.
484 *
485 * @returns true, if any of the floats at the beginning of our mFloats list
486 * have the NS_FRAME_IS_PUSHED_FLOAT bit set; false otherwise.
487 */
488 bool HasPushedFloatsFromPrevContinuation() const {
489 if (!mFloats.IsEmpty()) {
490 // If we have pushed floats, then they should be at the beginning of our
491 // float list.
492 if (mFloats.FirstChild()->GetStateBits() & NS_FRAME_IS_PUSHED_FLOAT) {
493 return true;
494 }
495 }
496
497 #ifdef DEBUG
498 // Double-check the above assertion that pushed floats should be at the
499 // beginning of our floats list.
500 for (nsFrameList::Enumerator e(mFloats); !e.AtEnd(); e.Next()) {
501 nsIFrame* f = e.get();
502 NS_ASSERTION(!(f->GetStateBits() & NS_FRAME_IS_PUSHED_FLOAT),
503 "pushed floats must be at the beginning of the float list");
504 }
505 #endif
506 return false;
507 }
508
509 protected:
510
511 /** grab overflow lines from this block's prevInFlow, and make them
512 * part of this block's mLines list.
513 * @return true if any lines were drained.
514 */
515 bool DrainOverflowLines();
516
517 /**
518 * @return false iff this block does not have a float on any child list.
519 * This function is O(1).
520 */
521 bool MaybeHasFloats() const {
522 if (!mFloats.IsEmpty()) {
523 return true;
524 }
525 // XXX this could be replaced with HasPushedFloats() if we enforced
526 // removing the property when the frame list becomes empty.
527 nsFrameList* list = GetPushedFloats();
528 if (list && !list->IsEmpty()) {
529 return true;
530 }
531 // For the OverflowOutOfFlowsProperty I think we do enforce that, but it's
532 // a mix of out-of-flow frames, so that's why the method name has "Maybe".
533 return GetStateBits() & NS_BLOCK_HAS_OVERFLOW_OUT_OF_FLOWS;
534 }
535
536 /** grab pushed floats from this block's prevInFlow, and splice
537 * them into this block's mFloats list.
538 */
539 void DrainPushedFloats(nsBlockReflowState& aState);
540
541 /** Load all our floats into the float manager (without reflowing them).
542 * Assumes float manager is in our own coordinate system.
543 */
544 void RecoverFloats(nsFloatManager& aFloatManager);
545
546 /** Reflow pushed floats
547 */
548 void ReflowPushedFloats(nsBlockReflowState& aState,
549 nsOverflowAreas& aOverflowAreas,
550 nsReflowStatus& aStatus);
551
552 /** Find any trailing BR clear from the last line of the block (or its PIFs)
553 */
554 uint8_t FindTrailingClear();
555
556 /**
557 * Remove a float from our float list.
558 */
559 void RemoveFloat(nsIFrame* aFloat);
560 /**
561 * Remove a float from the float cache for the line its placeholder is on.
562 */
563 void RemoveFloatFromFloatCache(nsIFrame* aFloat);
564
565 void CollectFloats(nsIFrame* aFrame, nsFrameList& aList,
566 bool aCollectFromSiblings) {
567 if (MaybeHasFloats()) {
568 DoCollectFloats(aFrame, aList, aCollectFromSiblings);
569 }
570 }
571 void DoCollectFloats(nsIFrame* aFrame, nsFrameList& aList,
572 bool aCollectFromSiblings);
573
574 // Remove a float, abs, rel positioned frame from the appropriate block's list
575 static void DoRemoveOutOfFlowFrame(nsIFrame* aFrame);
576
577 /** set up the conditions necessary for an resize reflow
578 * the primary task is to mark the minimumly sufficient lines dirty.
579 */
580 void PrepareResizeReflow(nsBlockReflowState& aState);
581
582 /** reflow all lines that have been marked dirty */
583 nsresult ReflowDirtyLines(nsBlockReflowState& aState);
584
585 /** Mark a given line dirty due to reflow being interrupted on or before it */
586 void MarkLineDirtyForInterrupt(nsLineBox* aLine);
587
588 //----------------------------------------
589 // Methods for line reflow
590 /**
591 * Reflow a line.
592 * @param aState the current reflow state
593 * @param aLine the line to reflow. can contain a single block frame
594 * or contain 1 or more inline frames.
595 * @param aKeepReflowGoing [OUT] indicates whether the caller should continue to reflow more lines
596 */
597 nsresult ReflowLine(nsBlockReflowState& aState,
598 line_iterator aLine,
599 bool* aKeepReflowGoing);
600
601 // Return false if it needs another reflow because of reduced space
602 // between floats that are next to it (but not next to its top), and
603 // return true otherwise.
604 bool PlaceLine(nsBlockReflowState& aState,
605 nsLineLayout& aLineLayout,
606 line_iterator aLine,
607 nsFloatManager::SavedState* aFloatStateBeforeLine,
608 nsRect& aFloatAvailableSpace, /* in-out */
609 nscoord& aAvailableSpaceHeight, /* in-out */
610 bool* aKeepReflowGoing);
611
612 /**
613 * If NS_BLOCK_LOOK_FOR_DIRTY_FRAMES is set, call MarkLineDirty
614 * on any line with a child frame that is dirty.
615 */
616 void LazyMarkLinesDirty();
617
618 /**
619 * Mark |aLine| dirty, and, if necessary because of possible
620 * pull-up, mark the previous line dirty as well. Also invalidates textruns
621 * on those lines because the text in the lines might have changed due to
622 * addition/removal of frames.
623 * @param aLine the line to mark dirty
624 * @param aLineList the line list containing that line
625 */
626 void MarkLineDirty(line_iterator aLine, const nsLineList* aLineList);
627
628 // XXX where to go
629 bool IsLastLine(nsBlockReflowState& aState,
630 line_iterator aLine);
631
632 void DeleteLine(nsBlockReflowState& aState,
633 nsLineList::iterator aLine,
634 nsLineList::iterator aLineEnd);
635
636 //----------------------------------------
637 // Methods for individual frame reflow
638
639 bool ShouldApplyTopMargin(nsBlockReflowState& aState,
640 nsLineBox* aLine);
641
642 nsresult ReflowBlockFrame(nsBlockReflowState& aState,
643 line_iterator aLine,
644 bool* aKeepGoing);
645
646 nsresult ReflowInlineFrames(nsBlockReflowState& aState,
647 line_iterator aLine,
648 bool* aKeepLineGoing);
649
650 nsresult DoReflowInlineFrames(nsBlockReflowState& aState,
651 nsLineLayout& aLineLayout,
652 line_iterator aLine,
653 nsFlowAreaRect& aFloatAvailableSpace,
654 nscoord& aAvailableSpaceHeight,
655 nsFloatManager::SavedState*
656 aFloatStateBeforeLine,
657 bool* aKeepReflowGoing,
658 LineReflowStatus* aLineReflowStatus,
659 bool aAllowPullUp);
660
661 nsresult ReflowInlineFrame(nsBlockReflowState& aState,
662 nsLineLayout& aLineLayout,
663 line_iterator aLine,
664 nsIFrame* aFrame,
665 LineReflowStatus* aLineReflowStatus);
666
667 // Compute the available width for a float.
668 nsRect AdjustFloatAvailableSpace(nsBlockReflowState& aState,
669 const nsRect& aFloatAvailableSpace,
670 nsIFrame* aFloatFrame);
671 // Computes the border-box width of the float
672 nscoord ComputeFloatWidth(nsBlockReflowState& aState,
673 const nsRect& aFloatAvailableSpace,
674 nsIFrame* aFloat);
675 // An incomplete aReflowStatus indicates the float should be split
676 // but only if the available height is constrained.
677 // aAdjustedAvailableSpace is the result of calling
678 // nsBlockFrame::AdjustFloatAvailableSpace.
679 nsresult ReflowFloat(nsBlockReflowState& aState,
680 const nsRect& aAdjustedAvailableSpace,
681 nsIFrame* aFloat,
682 nsMargin& aFloatMargin,
683 nsMargin& aFloatOffsets,
684 // Whether the float's position
685 // (aAdjustedAvailableSpace) has been pushed down
686 // due to the presence of other floats.
687 bool aFloatPushedDown,
688 nsReflowStatus& aReflowStatus);
689
690 //----------------------------------------
691 // Methods for pushing/pulling lines/frames
692
693 /**
694 * Create a next-in-flow, if necessary, for aFrame. If a new frame is
695 * created, place it in aLine if aLine is not null.
696 * @param aState the block reflow state
697 * @param aLine where to put a new frame
698 * @param aFrame the frame
699 * @return true if a new frame was created, false if not
700 */
701 bool CreateContinuationFor(nsBlockReflowState& aState,
702 nsLineBox* aLine,
703 nsIFrame* aFrame);
704
705 /**
706 * Push aLine (and any after it), since it cannot be placed on this
707 * page/column. Set aKeepReflowGoing to false and set
708 * flag aState.mReflowStatus as incomplete.
709 */
710 void PushTruncatedLine(nsBlockReflowState& aState,
711 line_iterator aLine,
712 bool* aKeepReflowGoing);
713
714 void SplitLine(nsBlockReflowState& aState,
715 nsLineLayout& aLineLayout,
716 line_iterator aLine,
717 nsIFrame* aFrame,
718 LineReflowStatus* aLineReflowStatus);
719
720 /**
721 * Pull a frame from the next available location (one of our lines or
722 * one of our next-in-flows lines).
723 * @return the pulled frame or nullptr
724 */
725 nsIFrame* PullFrame(nsBlockReflowState& aState,
726 line_iterator aLine);
727
728 /**
729 * Try to pull a frame out of a line pointed at by aFromLine.
730 *
731 * Note: pulling a frame from a line that is a place-holder frame
732 * doesn't automatically remove the corresponding float from the
733 * line's float array. This happens indirectly: either the line gets
734 * emptied (and destroyed) or the line gets reflowed (because we mark
735 * it dirty) and the code at the top of ReflowLine empties the
736 * array. So eventually, it will be removed, just not right away.
737 *
738 * @return the pulled frame or nullptr
739 */
740 nsIFrame* PullFrameFrom(nsLineBox* aLine,
741 nsBlockFrame* aFromContainer,
742 nsLineList::iterator aFromLine);
743
744 /**
745 * Push the line after aLineBefore to the overflow line list.
746 * @param aLineBefore a line in 'mLines' (or begin_lines() when
747 * pushing the first line)
748 */
749 void PushLines(nsBlockReflowState& aState,
750 nsLineList::iterator aLineBefore);
751
752 void PropagateFloatDamage(nsBlockReflowState& aState,
753 nsLineBox* aLine,
754 nscoord aDeltaY);
755
756 void CheckFloats(nsBlockReflowState& aState);
757
758 //----------------------------------------
759 // List handling kludge
760
761 // If this returns true, the block it's called on should get the
762 // NS_FRAME_HAS_DIRTY_CHILDREN bit set on it by the caller; either directly
763 // if it's already in reflow, or via calling FrameNeedsReflow() to schedule a
764 // reflow.
765 bool RenumberLists(nsPresContext* aPresContext);
766
767 static bool RenumberListsInBlock(nsPresContext* aPresContext,
768 nsBlockFrame* aBlockFrame,
769 int32_t* aOrdinal,
770 int32_t aDepth,
771 int32_t aIncrement);
772
773 static bool RenumberListsFor(nsPresContext* aPresContext, nsIFrame* aKid,
774 int32_t* aOrdinal, int32_t aDepth,
775 int32_t aIncrement);
776
777 static bool FrameStartsCounterScope(nsIFrame* aFrame);
778
779 void ReflowBullet(nsIFrame* aBulletFrame,
780 nsBlockReflowState& aState,
781 nsHTMLReflowMetrics& aMetrics,
782 nscoord aLineTop);
783
784 //----------------------------------------
785
786 virtual nsILineIterator* GetLineIterator() MOZ_OVERRIDE;
787
788 public:
789 bool HasOverflowLines() const {
790 return 0 != (GetStateBits() & NS_BLOCK_HAS_OVERFLOW_LINES);
791 }
792 FrameLines* GetOverflowLines() const;
793 protected:
794 FrameLines* RemoveOverflowLines();
795 void SetOverflowLines(FrameLines* aOverflowLines);
796 void DestroyOverflowLines();
797
798 /**
799 * This class is useful for efficiently modifying the out of flow
800 * overflow list. It gives the client direct writable access to
801 * the frame list temporarily but ensures that property is only
802 * written back if absolutely necessary.
803 */
804 struct nsAutoOOFFrameList {
805 nsFrameList mList;
806
807 nsAutoOOFFrameList(nsBlockFrame* aBlock)
808 : mPropValue(aBlock->GetOverflowOutOfFlows())
809 , mBlock(aBlock) {
810 if (mPropValue) {
811 mList = *mPropValue;
812 }
813 }
814 ~nsAutoOOFFrameList() {
815 mBlock->SetOverflowOutOfFlows(mList, mPropValue);
816 }
817 protected:
818 nsFrameList* const mPropValue;
819 nsBlockFrame* const mBlock;
820 };
821 friend struct nsAutoOOFFrameList;
822
823 nsFrameList* GetOverflowOutOfFlows() const;
824 void SetOverflowOutOfFlows(const nsFrameList& aList, nsFrameList* aPropValue);
825
826 /**
827 * @return the inside bullet frame or nullptr if we don't have one.
828 */
829 nsBulletFrame* GetInsideBullet() const;
830
831 /**
832 * @return the outside bullet frame or nullptr if we don't have one.
833 */
834 nsBulletFrame* GetOutsideBullet() const;
835
836 /**
837 * @return the outside bullet frame list frame property.
838 */
839 nsFrameList* GetOutsideBulletList() const;
840
841 /**
842 * @return true if this frame has pushed floats.
843 */
844 bool HasPushedFloats() const {
845 return 0 != (GetStateBits() & NS_BLOCK_HAS_PUSHED_FLOATS);
846 }
847
848 // Get the pushed floats list, which is used for *temporary* storage
849 // of floats during reflow, between when we decide they don't fit in
850 // this block until our next continuation takes them.
851 nsFrameList* GetPushedFloats() const;
852 // Get the pushed floats list, or if there is not currently one,
853 // make a new empty one.
854 nsFrameList* EnsurePushedFloats();
855 // Remove and return the pushed floats list.
856 nsFrameList* RemovePushedFloats();
857
858 #ifdef DEBUG
859 void VerifyLines(bool aFinalCheckOK);
860 void VerifyOverflowSituation();
861 int32_t GetDepth() const;
862 #endif
863
864 nscoord mMinWidth, mPrefWidth;
865
866 nsLineList mLines;
867
868 // List of all floats in this block
869 // XXXmats blocks rarely have floats, make it a frame property
870 nsFrameList mFloats;
871
872 friend class nsBlockReflowState;
873 friend class nsBlockInFlowLineIterator;
874
875 #ifdef DEBUG
876 public:
877 static bool gLamePaintMetrics;
878 static bool gLameReflowMetrics;
879 static bool gNoisy;
880 static bool gNoisyDamageRepair;
881 static bool gNoisyIntrinsic;
882 static bool gNoisyReflow;
883 static bool gReallyNoisyReflow;
884 static bool gNoisyFloatManager;
885 static bool gVerifyLines;
886 static bool gDisableResizeOpt;
887
888 static int32_t gNoiseIndent;
889
890 static const char* kReflowCommandType[];
891
892 protected:
893 static void InitDebugFlags();
894 #endif
895 };
896
897 #ifdef DEBUG
898 class AutoNoisyIndenter {
899 public:
900 AutoNoisyIndenter(bool aDoIndent) : mIndented(aDoIndent) {
901 if (mIndented) {
902 nsBlockFrame::gNoiseIndent++;
903 }
904 }
905 ~AutoNoisyIndenter() {
906 if (mIndented) {
907 nsBlockFrame::gNoiseIndent--;
908 }
909 }
910 private:
911 bool mIndented;
912 };
913 #endif
914
915 /**
916 * Iterates over all lines in the prev-in-flows/next-in-flows of this block.
917 */
918 class nsBlockInFlowLineIterator {
919 public:
920 typedef nsBlockFrame::line_iterator line_iterator;
921 /**
922 * Set up the iterator to point to aLine which must be a normal line
923 * in aFrame (not an overflow line).
924 */
925 nsBlockInFlowLineIterator(nsBlockFrame* aFrame, line_iterator aLine);
926 /**
927 * Set up the iterator to point to the first line found starting from
928 * aFrame. Sets aFoundValidLine to false if there is no such line.
929 * After aFoundValidLine has returned false, don't call any methods on this
930 * object again.
931 */
932 nsBlockInFlowLineIterator(nsBlockFrame* aFrame, bool* aFoundValidLine);
933 /**
934 * Set up the iterator to point to the line that contains aFindFrame (either
935 * directly or indirectly). If aFrame is out of flow, or contained in an
936 * out-of-flow, finds the line containing the out-of-flow's placeholder. If
937 * the frame is not found, sets aFoundValidLine to false. After
938 * aFoundValidLine has returned false, don't call any methods on this
939 * object again.
940 */
941 nsBlockInFlowLineIterator(nsBlockFrame* aFrame, nsIFrame* aFindFrame,
942 bool* aFoundValidLine);
943
944 line_iterator GetLine() { return mLine; }
945 bool IsLastLineInList();
946 nsBlockFrame* GetContainer() { return mFrame; }
947 bool GetInOverflow() { return mLineList != &mFrame->mLines; }
948
949 /**
950 * Returns the current line list we're iterating, null means
951 * we're iterating |mLines| of the container.
952 */
953 nsLineList* GetLineList() { return mLineList; }
954
955 /**
956 * Returns the end-iterator of whatever line list we're in.
957 */
958 line_iterator End();
959
960 /**
961 * Returns false if there are no more lines. After this has returned false,
962 * don't call any methods on this object again.
963 */
964 bool Next();
965 /**
966 * Returns false if there are no more lines. After this has returned false,
967 * don't call any methods on this object again.
968 */
969 bool Prev();
970
971 private:
972 friend class nsBlockFrame;
973 // XXX nsBlockFrame uses this internally in one place. Try to remove it.
974 nsBlockInFlowLineIterator(nsBlockFrame* aFrame, line_iterator aLine, bool aInOverflow);
975
976 nsBlockFrame* mFrame;
977 line_iterator mLine;
978 nsLineList* mLineList; // the line list mLine is in
979
980 /**
981 * Moves iterator to next valid line reachable from the current block.
982 * Returns false if there are no valid lines.
983 */
984 bool FindValidLine();
985 };
986
987 #endif /* nsBlockFrame_h___ */

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