mirror of
https://github.com/mozilla/gecko-dev.git
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926 lines
34 KiB
C++
926 lines
34 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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// vim:cindent:ts=2:et:sw=2:
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* rendering object for CSS display:block, inline-block, and list-item
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* boxes, also used for various anonymous boxes
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*/
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#ifndef nsBlockFrame_h___
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#define nsBlockFrame_h___
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#include "nsContainerFrame.h"
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#include "nsHTMLParts.h"
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#include "nsLineBox.h"
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#include "nsCSSPseudoElements.h"
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#include "nsStyleSet.h"
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#include "nsFloatManager.h"
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enum LineReflowStatus {
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// The line was completely reflowed and fit in available width, and we should
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// try to pull up content from the next line if possible.
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LINE_REFLOW_OK,
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// The line was completely reflowed and fit in available width, but we should
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// not try to pull up content from the next line.
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LINE_REFLOW_STOP,
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// We need to reflow the line again at its current vertical position. The
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// new reflow should not try to pull up any frames from the next line.
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LINE_REFLOW_REDO_NO_PULL,
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// We need to reflow the line again using the floats from its height
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// this reflow, since its height made it hit floats that were not
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// adjacent to its top.
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LINE_REFLOW_REDO_MORE_FLOATS,
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// We need to reflow the line again at a lower vertical postion where there
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// may be more horizontal space due to different float configuration.
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LINE_REFLOW_REDO_NEXT_BAND,
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// The line did not fit in the available vertical space. Try pushing it to
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// the next page or column if it's not the first line on the current page/column.
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LINE_REFLOW_TRUNCATED
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};
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class nsBlockReflowState;
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class nsBlockInFlowLineIterator;
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class nsBulletFrame;
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class nsLineBox;
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class nsFirstLineFrame;
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class nsIntervalSet;
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/**
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* Some invariants:
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* -- The overflow out-of-flows list contains the out-of-
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* flow frames whose placeholders are in the overflow list.
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* -- A given piece of content has at most one placeholder
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* frame in a block's normal child list.
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* -- While a block is being reflowed, and from then until
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* its next-in-flow is reflowed it may have a
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* PushedFloatProperty frame property that points to
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* an nsFrameList. This list contains continuations for
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* floats whose prev-in-flow is in the block's regular float
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* list and first-in-flows of floats that did not fit, but
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* whose placeholders are in the block or one of its
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* prev-in-flows.
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* -- In all these frame lists, if there are two frames for
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* the same content appearing in the list, then the frames
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* appear with the prev-in-flow before the next-in-flow.
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* -- While reflowing a block, its overflow line list
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* will usually be empty but in some cases will have lines
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* (while we reflow the block at its shrink-wrap width).
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* In this case any new overflowing content must be
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* prepended to the overflow lines.
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*/
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// see nsHTMLParts.h for the public block state bits
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/**
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* Something in the block has changed that requires Bidi resolution to be
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* performed on the block. This flag must be either set on all blocks in a
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* continuation chain or none of them.
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*/
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#define NS_BLOCK_NEEDS_BIDI_RESOLUTION NS_FRAME_STATE_BIT(20)
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#define NS_BLOCK_HAS_PUSHED_FLOATS NS_FRAME_STATE_BIT(21)
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#define NS_BLOCK_HAS_LINE_CURSOR NS_FRAME_STATE_BIT(24)
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#define NS_BLOCK_HAS_OVERFLOW_LINES NS_FRAME_STATE_BIT(25)
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#define NS_BLOCK_HAS_OVERFLOW_OUT_OF_FLOWS NS_FRAME_STATE_BIT(26)
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// Set on any block that has descendant frames in the normal
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// flow with 'clear' set to something other than 'none'
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// (including <BR CLEAR="..."> frames)
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#define NS_BLOCK_HAS_CLEAR_CHILDREN NS_FRAME_STATE_BIT(27)
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// Are our cached intrinsic widths intrinsic widths for font size
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// inflation? i.e., what was the current state of
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// GetPresContext()->mInflationDisabledForShrinkWrap at the time they
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// were computed?
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// nsBlockFrame is the only thing that caches intrinsic widths that
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// needs to track this because it's the only thing that caches intrinsic
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// widths that lives inside of things (form controls) that do intrinsic
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// sizing with font inflation enabled.
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#define NS_BLOCK_FRAME_INTRINSICS_INFLATED NS_FRAME_STATE_BIT(62)
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#define nsBlockFrameSuper nsContainerFrame
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/*
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* Base class for block and inline frames.
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* The block frame has an additional child list, kAbsoluteList, which
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* contains the absolutely positioned frames.
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*/
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class nsBlockFrame : public nsBlockFrameSuper
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{
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public:
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NS_DECL_QUERYFRAME_TARGET(nsBlockFrame)
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NS_DECL_FRAMEARENA_HELPERS
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typedef nsLineList::iterator line_iterator;
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typedef nsLineList::const_iterator const_line_iterator;
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typedef nsLineList::reverse_iterator reverse_line_iterator;
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typedef nsLineList::const_reverse_iterator const_reverse_line_iterator;
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line_iterator begin_lines() { return mLines.begin(); }
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line_iterator end_lines() { return mLines.end(); }
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const_line_iterator begin_lines() const { return mLines.begin(); }
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const_line_iterator end_lines() const { return mLines.end(); }
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reverse_line_iterator rbegin_lines() { return mLines.rbegin(); }
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reverse_line_iterator rend_lines() { return mLines.rend(); }
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const_reverse_line_iterator rbegin_lines() const { return mLines.rbegin(); }
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const_reverse_line_iterator rend_lines() const { return mLines.rend(); }
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line_iterator line(nsLineBox* aList) { return mLines.begin(aList); }
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reverse_line_iterator rline(nsLineBox* aList) { return mLines.rbegin(aList); }
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friend nsIFrame* NS_NewBlockFrame(nsIPresShell* aPresShell, nsStyleContext* aContext, uint32_t aFlags);
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// nsQueryFrame
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NS_DECL_QUERYFRAME
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// nsIFrame
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NS_IMETHOD Init(nsIContent* aContent,
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nsIFrame* aParent,
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nsIFrame* aPrevInFlow);
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NS_IMETHOD SetInitialChildList(ChildListID aListID,
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nsFrameList& aChildList);
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NS_IMETHOD AppendFrames(ChildListID aListID,
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nsFrameList& aFrameList);
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NS_IMETHOD InsertFrames(ChildListID aListID,
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nsIFrame* aPrevFrame,
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nsFrameList& aFrameList);
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NS_IMETHOD RemoveFrame(ChildListID aListID,
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nsIFrame* aOldFrame);
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virtual const nsFrameList& GetChildList(ChildListID aListID) const;
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virtual void GetChildLists(nsTArray<ChildList>* aLists) const;
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virtual nscoord GetBaseline() const;
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virtual nscoord GetCaretBaseline() const;
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virtual void DestroyFrom(nsIFrame* aDestructRoot);
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virtual nsSplittableType GetSplittableType() const;
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virtual bool IsFloatContainingBlock() const;
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NS_IMETHOD BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsRect& aDirtyRect,
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const nsDisplayListSet& aLists);
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virtual nsIAtom* GetType() const;
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virtual bool IsFrameOfType(uint32_t aFlags) const
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{
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return nsContainerFrame::IsFrameOfType(aFlags &
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~(nsIFrame::eCanContainOverflowContainers |
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nsIFrame::eBlockFrame));
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}
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#ifdef DEBUG
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NS_IMETHOD List(FILE* out, int32_t aIndent, uint32_t aFlags = 0) const;
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NS_IMETHOD_(nsFrameState) GetDebugStateBits() const;
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NS_IMETHOD GetFrameName(nsAString& aResult) const;
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#endif
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#ifdef ACCESSIBILITY
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virtual mozilla::a11y::AccType AccessibleType() MOZ_OVERRIDE;
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#endif
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// line cursor methods to speed up searching for the line(s)
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// containing a point. The basic idea is that we set the cursor
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// property if the lines' overflowArea.VisualOverflow().ys and
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// overflowArea.VisualOverflow().yMosts are non-decreasing
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// (considering only non-empty overflowArea.VisualOverflow()s; empty
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// overflowArea.VisualOverflow()s never participate in event handling
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// or painting), and the block has sufficient number of lines. The
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// cursor property points to a "recently used" line. If we get a
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// series of requests that work on lines
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// "near" the cursor, then we can find those nearby lines quickly by
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// starting our search at the cursor.
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// Clear out line cursor because we're disturbing the lines (i.e., Reflow)
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void ClearLineCursor();
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// Get the first line that might contain y-coord 'y', or nullptr if you must search
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// all lines. If nonnull is returned then we guarantee that the lines'
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// combinedArea.ys and combinedArea.yMosts are non-decreasing.
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// The actual line returned might not contain 'y', but if not, it is guaranteed
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// to be before any line which does contain 'y'.
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nsLineBox* GetFirstLineContaining(nscoord y);
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// Set the line cursor to our first line. Only call this if you
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// guarantee that the lines' combinedArea.ys and combinedArea.yMosts
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// are non-decreasing.
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void SetupLineCursor();
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virtual void ChildIsDirty(nsIFrame* aChild);
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virtual bool IsVisibleInSelection(nsISelection* aSelection);
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virtual bool IsEmpty();
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virtual bool CachedIsEmpty();
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virtual bool IsSelfEmpty();
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// Given that we have a bullet, does it actually draw something, i.e.,
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// do we have either a 'list-style-type' or 'list-style-image' that is
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// not 'none'?
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bool BulletIsEmpty() const;
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/**
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* Return the bullet text equivalent.
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*/
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void GetBulletText(nsAString& aText) const;
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/**
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* Return true if there's a bullet.
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*/
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bool HasBullet() const {
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return HasOutsideBullet() || HasInsideBullet();
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}
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/**
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* @return true if this frame has an inside bullet frame.
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*/
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bool HasInsideBullet() const {
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return 0 != (mState & NS_BLOCK_FRAME_HAS_INSIDE_BULLET);
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}
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/**
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* @return true if this frame has an outside bullet frame.
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*/
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bool HasOutsideBullet() const {
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return 0 != (mState & NS_BLOCK_FRAME_HAS_OUTSIDE_BULLET);
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}
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/**
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* @return the bullet frame or nullptr if we don't have one.
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*/
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nsBulletFrame* GetBullet() const {
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nsBulletFrame* outside = GetOutsideBullet();
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return outside ? outside : GetInsideBullet();
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}
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virtual void MarkIntrinsicWidthsDirty();
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private:
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void CheckIntrinsicCacheAgainstShrinkWrapState();
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public:
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virtual nscoord GetMinWidth(nsRenderingContext *aRenderingContext);
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virtual nscoord GetPrefWidth(nsRenderingContext *aRenderingContext);
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virtual nsRect ComputeTightBounds(gfxContext* aContext) const;
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NS_IMETHOD Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus);
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NS_IMETHOD AttributeChanged(int32_t aNameSpaceID,
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nsIAtom* aAttribute,
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int32_t aModType);
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/**
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* Move any frames on our overflow list to the end of our principal list.
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* @return true if there were any overflow frames
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*/
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virtual bool DrainSelfOverflowList();
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virtual nsresult StealFrame(nsPresContext* aPresContext,
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nsIFrame* aChild,
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bool aForceNormal = false);
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virtual void DeleteNextInFlowChild(nsPresContext* aPresContext,
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nsIFrame* aNextInFlow,
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bool aDeletingEmptyFrames);
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/**
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* Determines whether the collapsed margin carried out of the last
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* line includes the margin-top of a line with clearance (in which
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* case we must avoid collapsing that margin with our bottom margin)
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*/
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bool CheckForCollapsedBottomMarginFromClearanceLine();
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static nsresult GetCurrentLine(nsBlockReflowState *aState, nsLineBox **aOutCurrentLine);
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/**
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* Determine if this block is a margin root at the top/bottom edges.
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*/
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void IsMarginRoot(bool* aTopMarginRoot, bool* aBottomMarginRoot);
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static bool BlockNeedsFloatManager(nsIFrame* aBlock);
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/**
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* Returns whether aFrame is a block frame that will wrap its contents
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* around floats intruding on it from the outside. (aFrame need not
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* be a block frame, but if it's not, the result will be false.)
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*/
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static bool BlockCanIntersectFloats(nsIFrame* aFrame);
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/**
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* Returns the width that needs to be cleared past floats for blocks
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* that cannot intersect floats. aState must already have
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* GetAvailableSpace called on it for the vertical position that we
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* care about (which need not be its current mY)
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*/
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struct ReplacedElementWidthToClear {
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nscoord marginLeft, borderBoxWidth, marginRight;
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nscoord MarginBoxWidth() const
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{ return marginLeft + borderBoxWidth + marginRight; }
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};
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static ReplacedElementWidthToClear
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WidthToClearPastFloats(nsBlockReflowState& aState,
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const nsRect& aFloatAvailableSpace,
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nsIFrame* aFrame);
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/**
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* Creates a contination for aFloat and adds it to the list of overflow floats.
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* Also updates aState.mReflowStatus to include the float's incompleteness.
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* Must only be called while this block frame is in reflow.
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* aFloatStatus must be the float's true, unmodified reflow status.
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*
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*/
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nsresult SplitFloat(nsBlockReflowState& aState,
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nsIFrame* aFloat,
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nsReflowStatus aFloatStatus);
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/**
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* Walks up the frame tree, starting with aCandidate, and returns the first
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* block frame that it encounters.
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*/
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static nsBlockFrame* GetNearestAncestorBlock(nsIFrame* aCandidate);
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struct FrameLines {
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nsLineList mLines;
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nsFrameList mFrames;
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};
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protected:
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nsBlockFrame(nsStyleContext* aContext)
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: nsContainerFrame(aContext)
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, mMinWidth(NS_INTRINSIC_WIDTH_UNKNOWN)
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, mPrefWidth(NS_INTRINSIC_WIDTH_UNKNOWN)
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{
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#ifdef DEBUG
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InitDebugFlags();
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#endif
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}
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virtual ~nsBlockFrame();
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#ifdef DEBUG
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#ifdef _IMPL_NS_LAYOUT
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already_AddRefed<nsStyleContext> GetFirstLetterStyle(nsPresContext* aPresContext)
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{
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return aPresContext->StyleSet()->
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ProbePseudoElementStyle(mContent->AsElement(),
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nsCSSPseudoElements::ePseudo_firstLetter,
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mStyleContext);
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}
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#endif
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#endif
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NS_DECLARE_FRAME_PROPERTY(LineCursorProperty, nullptr)
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nsLineBox* GetLineCursor() {
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return (GetStateBits() & NS_BLOCK_HAS_LINE_CURSOR) ?
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static_cast<nsLineBox*>(Properties().Get(LineCursorProperty())) : nullptr;
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}
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nsLineBox* NewLineBox(nsIFrame* aFrame, bool aIsBlock) {
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return NS_NewLineBox(PresContext()->PresShell(), aFrame, aIsBlock);
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}
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nsLineBox* NewLineBox(nsLineBox* aFromLine, nsIFrame* aFrame, int32_t aCount) {
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return NS_NewLineBox(PresContext()->PresShell(), aFromLine, aFrame, aCount);
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}
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void FreeLineBox(nsLineBox* aLine) {
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if (aLine == GetLineCursor()) {
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ClearLineCursor();
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}
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aLine->Destroy(PresContext()->PresShell());
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}
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void TryAllLines(nsLineList::iterator* aIterator,
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nsLineList::iterator* aStartIterator,
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nsLineList::iterator* aEndIterator,
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bool* aInOverflowLines,
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FrameLines** aOverflowLines);
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void SetFlags(nsFrameState aFlags) {
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mState &= ~NS_BLOCK_FLAGS_MASK;
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mState |= aFlags;
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}
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/** move the frames contained by aLine by aDY
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* if aLine is a block, its child floats are added to the state manager
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*/
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void SlideLine(nsBlockReflowState& aState,
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nsLineBox* aLine, nscoord aDY);
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virtual int GetSkipSides() const MOZ_OVERRIDE;
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virtual void ComputeFinalSize(const nsHTMLReflowState& aReflowState,
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nsBlockReflowState& aState,
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nsHTMLReflowMetrics& aMetrics,
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nscoord* aBottomEdgeOfChildren);
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void ComputeOverflowAreas(const nsRect& aBounds,
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const nsStyleDisplay* aDisplay,
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nscoord aBottomEdgeOfChildren,
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nsOverflowAreas& aOverflowAreas);
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/** add the frames in aFrameList to this block after aPrevSibling
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* this block thinks in terms of lines, but the frame construction code
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* knows nothing about lines at all. So we need to find the line that
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* contains aPrevSibling and add aFrameList after aPrevSibling on that line.
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* new lines are created as necessary to handle block data in aFrameList.
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* This function will clear aFrameList.
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*/
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virtual nsresult AddFrames(nsFrameList& aFrameList, nsIFrame* aPrevSibling);
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#ifdef IBMBIDI
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/**
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* Perform Bidi resolution on this frame
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*/
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nsresult ResolveBidi();
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/**
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* Test whether the frame is a form control in a visual Bidi page.
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* This is necessary for backwards-compatibility, because most visual
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* pages use logical order for form controls so that they will
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* display correctly on native widgets in OSs with Bidi support
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* @param aPresContext the pres context
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* @return whether the frame is a BIDI form control
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*/
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bool IsVisualFormControl(nsPresContext* aPresContext);
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#endif
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public:
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/**
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* Does all the real work for removing aDeletedFrame
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* -- finds the line containing aDeletedFrame
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* -- removes all aDeletedFrame next-in-flows (or all continuations,
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* if REMOVE_FIXED_CONTINUATIONS is given)
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* -- marks lines dirty as needed
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* -- marks textruns dirty (unless FRAMES_ARE_EMPTY is given, in which
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* case textruns do not need to be dirtied)
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* -- destroys all removed frames
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*/
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enum {
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REMOVE_FIXED_CONTINUATIONS = 0x02,
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FRAMES_ARE_EMPTY = 0x04
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};
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nsresult DoRemoveFrame(nsIFrame* aDeletedFrame, uint32_t aFlags);
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void ReparentFloats(nsIFrame* aFirstFrame,
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nsBlockFrame* aOldParent, bool aFromOverflow,
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bool aReparentSiblings);
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virtual bool UpdateOverflow();
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/** Load all of aFrame's floats into the float manager iff aFrame is not a
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* block formatting context. Handles all necessary float manager translations;
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* assumes float manager is in aFrame's parent's coord system.
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* Safe to call on non-blocks (does nothing).
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*/
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static void RecoverFloatsFor(nsIFrame* aFrame,
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nsFloatManager& aFloatManager);
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protected:
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/** grab overflow lines from this block's prevInFlow, and make them
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* part of this block's mLines list.
|
|
* @return true if any lines were drained.
|
|
*/
|
|
bool DrainOverflowLines();
|
|
|
|
/** grab pushed floats from this block's prevInFlow, and splice
|
|
* them into this block's mFloats list.
|
|
*/
|
|
void DrainPushedFloats(nsBlockReflowState& aState);
|
|
|
|
/** Load all our floats into the float manager (without reflowing them).
|
|
* Assumes float manager is in our own coordinate system.
|
|
*/
|
|
void RecoverFloats(nsFloatManager& aFloatManager);
|
|
|
|
/** Reflow pushed floats
|
|
*/
|
|
nsresult ReflowPushedFloats(nsBlockReflowState& aState,
|
|
nsOverflowAreas& aOverflowAreas,
|
|
nsReflowStatus& aStatus);
|
|
|
|
/** Find any trailing BR clear from the last line of the block (or its PIFs)
|
|
*/
|
|
uint8_t FindTrailingClear();
|
|
|
|
/**
|
|
* Remove a float from our float list and also the float cache
|
|
* for the line its placeholder is on.
|
|
*/
|
|
line_iterator RemoveFloat(nsIFrame* aFloat);
|
|
|
|
void CollectFloats(nsIFrame* aFrame, nsFrameList& aList,
|
|
bool aFromOverflow, bool aCollectFromSiblings);
|
|
// Remove a float, abs, rel positioned frame from the appropriate block's list
|
|
static void DoRemoveOutOfFlowFrame(nsIFrame* aFrame);
|
|
|
|
/** set up the conditions necessary for an resize reflow
|
|
* the primary task is to mark the minimumly sufficient lines dirty.
|
|
*/
|
|
nsresult PrepareResizeReflow(nsBlockReflowState& aState);
|
|
|
|
/** reflow all lines that have been marked dirty */
|
|
nsresult ReflowDirtyLines(nsBlockReflowState& aState);
|
|
|
|
/** Mark a given line dirty due to reflow being interrupted on or before it */
|
|
void MarkLineDirtyForInterrupt(nsLineBox* aLine);
|
|
|
|
//----------------------------------------
|
|
// Methods for line reflow
|
|
/**
|
|
* Reflow a line.
|
|
* @param aState the current reflow state
|
|
* @param aLine the line to reflow. can contain a single block frame
|
|
* or contain 1 or more inline frames.
|
|
* @param aKeepReflowGoing [OUT] indicates whether the caller should continue to reflow more lines
|
|
*/
|
|
nsresult ReflowLine(nsBlockReflowState& aState,
|
|
line_iterator aLine,
|
|
bool* aKeepReflowGoing);
|
|
|
|
// Return false if it needs another reflow because of reduced space
|
|
// between floats that are next to it (but not next to its top), and
|
|
// return true otherwise.
|
|
bool PlaceLine(nsBlockReflowState& aState,
|
|
nsLineLayout& aLineLayout,
|
|
line_iterator aLine,
|
|
nsFloatManager::SavedState* aFloatStateBeforeLine,
|
|
nsRect& aFloatAvailableSpace, /* in-out */
|
|
nscoord& aAvailableSpaceHeight, /* in-out */
|
|
bool* aKeepReflowGoing);
|
|
|
|
/**
|
|
* Mark |aLine| dirty, and, if necessary because of possible
|
|
* pull-up, mark the previous line dirty as well. Also invalidates textruns
|
|
* on those lines because the text in the lines might have changed due to
|
|
* addition/removal of frames.
|
|
* @param aLine the line to mark dirty
|
|
* @param aLineList the line list containing that line
|
|
*/
|
|
void MarkLineDirty(line_iterator aLine, const nsLineList* aLineList);
|
|
|
|
// XXX where to go
|
|
bool IsLastLine(nsBlockReflowState& aState,
|
|
line_iterator aLine);
|
|
|
|
void DeleteLine(nsBlockReflowState& aState,
|
|
nsLineList::iterator aLine,
|
|
nsLineList::iterator aLineEnd);
|
|
|
|
//----------------------------------------
|
|
// Methods for individual frame reflow
|
|
|
|
bool ShouldApplyTopMargin(nsBlockReflowState& aState,
|
|
nsLineBox* aLine);
|
|
|
|
nsresult ReflowBlockFrame(nsBlockReflowState& aState,
|
|
line_iterator aLine,
|
|
bool* aKeepGoing);
|
|
|
|
nsresult ReflowInlineFrames(nsBlockReflowState& aState,
|
|
line_iterator aLine,
|
|
bool* aKeepLineGoing);
|
|
|
|
nsresult DoReflowInlineFrames(nsBlockReflowState& aState,
|
|
nsLineLayout& aLineLayout,
|
|
line_iterator aLine,
|
|
nsFlowAreaRect& aFloatAvailableSpace,
|
|
nscoord& aAvailableSpaceHeight,
|
|
nsFloatManager::SavedState*
|
|
aFloatStateBeforeLine,
|
|
bool* aKeepReflowGoing,
|
|
LineReflowStatus* aLineReflowStatus,
|
|
bool aAllowPullUp);
|
|
|
|
nsresult ReflowInlineFrame(nsBlockReflowState& aState,
|
|
nsLineLayout& aLineLayout,
|
|
line_iterator aLine,
|
|
nsIFrame* aFrame,
|
|
LineReflowStatus* aLineReflowStatus);
|
|
|
|
// Compute the available width for a float.
|
|
nsRect AdjustFloatAvailableSpace(nsBlockReflowState& aState,
|
|
const nsRect& aFloatAvailableSpace,
|
|
nsIFrame* aFloatFrame);
|
|
// Computes the border-box width of the float
|
|
nscoord ComputeFloatWidth(nsBlockReflowState& aState,
|
|
const nsRect& aFloatAvailableSpace,
|
|
nsIFrame* aFloat);
|
|
// An incomplete aReflowStatus indicates the float should be split
|
|
// but only if the available height is constrained.
|
|
// aAdjustedAvailableSpace is the result of calling
|
|
// nsBlockFrame::AdjustFloatAvailableSpace.
|
|
nsresult ReflowFloat(nsBlockReflowState& aState,
|
|
const nsRect& aAdjustedAvailableSpace,
|
|
nsIFrame* aFloat,
|
|
nsMargin& aFloatMargin,
|
|
// Whether the float's position
|
|
// (aAdjustedAvailableSpace) has been pushed down
|
|
// due to the presence of other floats.
|
|
bool aFloatPushedDown,
|
|
nsReflowStatus& aReflowStatus);
|
|
|
|
//----------------------------------------
|
|
// Methods for pushing/pulling lines/frames
|
|
|
|
/**
|
|
* Create a next-in-flow, if necessary, for aFrame. If a new frame is
|
|
* created, place it in aLine if aLine is not null.
|
|
* @param aState the block reflow state
|
|
* @param aLine where to put a new frame
|
|
* @param aFrame the frame
|
|
* @param aMadeNewFrame true if a new frame was created, false if not
|
|
* @return NS_OK if a next-in-flow already exists or is successfully created
|
|
*/
|
|
virtual nsresult CreateContinuationFor(nsBlockReflowState& aState,
|
|
nsLineBox* aLine,
|
|
nsIFrame* aFrame,
|
|
bool& aMadeNewFrame);
|
|
|
|
/**
|
|
* Push aLine (and any after it), since it cannot be placed on this
|
|
* page/column. Set aKeepReflowGoing to false and set
|
|
* flag aState.mReflowStatus as incomplete.
|
|
*/
|
|
void PushTruncatedLine(nsBlockReflowState& aState,
|
|
line_iterator aLine,
|
|
bool* aKeepReflowGoing);
|
|
|
|
nsresult SplitLine(nsBlockReflowState& aState,
|
|
nsLineLayout& aLineLayout,
|
|
line_iterator aLine,
|
|
nsIFrame* aFrame,
|
|
LineReflowStatus* aLineReflowStatus);
|
|
|
|
/**
|
|
* Pull a frame from the next available location (one of our lines or
|
|
* one of our next-in-flows lines).
|
|
* @return the pulled frame or nullptr
|
|
*/
|
|
nsIFrame* PullFrame(nsBlockReflowState& aState,
|
|
line_iterator aLine);
|
|
|
|
/**
|
|
* Try to pull a frame out of a line pointed at by aFromLine.
|
|
*
|
|
* Note: pulling a frame from a line that is a place-holder frame
|
|
* doesn't automatically remove the corresponding float from the
|
|
* line's float array. This happens indirectly: either the line gets
|
|
* emptied (and destroyed) or the line gets reflowed (because we mark
|
|
* it dirty) and the code at the top of ReflowLine empties the
|
|
* array. So eventually, it will be removed, just not right away.
|
|
*
|
|
* @return the pulled frame or nullptr
|
|
*/
|
|
nsIFrame* PullFrameFrom(nsBlockReflowState& aState,
|
|
nsLineBox* aLine,
|
|
nsBlockFrame* aFromContainer,
|
|
bool aFromOverflowLine,
|
|
nsFrameList& aFromFrameList,
|
|
nsLineList::iterator aFromLine);
|
|
|
|
/**
|
|
* Push the line after aLineBefore to the overflow line list.
|
|
* @param aLineBefore a line in 'mLines' (or begin_lines() when
|
|
* pushing the first line)
|
|
*/
|
|
void PushLines(nsBlockReflowState& aState,
|
|
nsLineList::iterator aLineBefore);
|
|
|
|
void PropagateFloatDamage(nsBlockReflowState& aState,
|
|
nsLineBox* aLine,
|
|
nscoord aDeltaY);
|
|
|
|
void CheckFloats(nsBlockReflowState& aState);
|
|
|
|
//----------------------------------------
|
|
// List handling kludge
|
|
|
|
// If this returns true, the block it's called on should get the
|
|
// NS_FRAME_HAS_DIRTY_CHILDREN bit set on it by the caller; either directly
|
|
// if it's already in reflow, or via calling FrameNeedsReflow() to schedule a
|
|
// reflow.
|
|
bool RenumberLists(nsPresContext* aPresContext);
|
|
|
|
static bool RenumberListsInBlock(nsPresContext* aPresContext,
|
|
nsBlockFrame* aBlockFrame,
|
|
int32_t* aOrdinal,
|
|
int32_t aDepth,
|
|
int32_t aIncrement);
|
|
|
|
static bool RenumberListsFor(nsPresContext* aPresContext, nsIFrame* aKid,
|
|
int32_t* aOrdinal, int32_t aDepth,
|
|
int32_t aIncrement);
|
|
|
|
static bool FrameStartsCounterScope(nsIFrame* aFrame);
|
|
|
|
void ReflowBullet(nsIFrame* aBulletFrame,
|
|
nsBlockReflowState& aState,
|
|
nsHTMLReflowMetrics& aMetrics,
|
|
nscoord aLineTop);
|
|
|
|
//----------------------------------------
|
|
|
|
virtual nsILineIterator* GetLineIterator();
|
|
|
|
public:
|
|
bool HasOverflowLines() const {
|
|
return 0 != (GetStateBits() & NS_BLOCK_HAS_OVERFLOW_LINES);
|
|
}
|
|
FrameLines* GetOverflowLines() const;
|
|
protected:
|
|
FrameLines* RemoveOverflowLines();
|
|
void SetOverflowLines(FrameLines* aOverflowLines);
|
|
void DestroyOverflowLines();
|
|
|
|
// Determine the computed height that's in effect for this block
|
|
// frame (that is, our computed height minus the heights of our
|
|
// previous in-flows).
|
|
// XXXbz this clearly makes laying out a block with N in-flows
|
|
// O(N^2)! Good thing the constant is tiny.
|
|
nscoord GetEffectiveComputedHeight(const nsHTMLReflowState& aReflowState) const;
|
|
|
|
/**
|
|
* This class is useful for efficiently modifying the out of flow
|
|
* overflow list. It gives the client direct writable access to
|
|
* the frame list temporarily but ensures that property is only
|
|
* written back if absolutely necessary.
|
|
*/
|
|
struct nsAutoOOFFrameList {
|
|
nsFrameList mList;
|
|
|
|
nsAutoOOFFrameList(nsBlockFrame* aBlock)
|
|
: mPropValue(aBlock->GetOverflowOutOfFlows())
|
|
, mBlock(aBlock) {
|
|
if (mPropValue) {
|
|
mList = *mPropValue;
|
|
}
|
|
}
|
|
~nsAutoOOFFrameList() {
|
|
mBlock->SetOverflowOutOfFlows(mList, mPropValue);
|
|
}
|
|
protected:
|
|
nsFrameList* const mPropValue;
|
|
nsBlockFrame* const mBlock;
|
|
};
|
|
friend struct nsAutoOOFFrameList;
|
|
|
|
nsFrameList* GetOverflowOutOfFlows() const;
|
|
void SetOverflowOutOfFlows(const nsFrameList& aList, nsFrameList* aPropValue);
|
|
|
|
/**
|
|
* @return the inside bullet frame or nullptr if we don't have one.
|
|
*/
|
|
nsBulletFrame* GetInsideBullet() const;
|
|
|
|
/**
|
|
* @return the outside bullet frame or nullptr if we don't have one.
|
|
*/
|
|
nsBulletFrame* GetOutsideBullet() const;
|
|
|
|
/**
|
|
* @return the outside bullet frame list frame property.
|
|
*/
|
|
nsFrameList* GetOutsideBulletList() const;
|
|
|
|
/**
|
|
* @return true if this frame has pushed floats.
|
|
*/
|
|
bool HasPushedFloats() const {
|
|
return 0 != (GetStateBits() & NS_BLOCK_HAS_PUSHED_FLOATS);
|
|
}
|
|
|
|
// Get the pushed floats list, which is used for *temporary* storage
|
|
// of floats during reflow, between when we decide they don't fit in
|
|
// this block until our next continuation takes them.
|
|
nsFrameList* GetPushedFloats() const;
|
|
// Get the pushed floats list, or if there is not currently one,
|
|
// make a new empty one.
|
|
nsFrameList* EnsurePushedFloats();
|
|
// Remove and return the pushed floats list.
|
|
nsFrameList* RemovePushedFloats();
|
|
|
|
#ifdef DEBUG
|
|
void VerifyLines(bool aFinalCheckOK);
|
|
void VerifyOverflowSituation();
|
|
int32_t GetDepth() const;
|
|
#endif
|
|
|
|
nscoord mMinWidth, mPrefWidth;
|
|
|
|
nsLineList mLines;
|
|
|
|
// List of all floats in this block
|
|
// XXXmats blocks rarely have floats, make it a frame property
|
|
nsFrameList mFloats;
|
|
|
|
friend class nsBlockReflowState;
|
|
friend class nsBlockInFlowLineIterator;
|
|
|
|
#ifdef DEBUG
|
|
public:
|
|
static bool gLamePaintMetrics;
|
|
static bool gLameReflowMetrics;
|
|
static bool gNoisy;
|
|
static bool gNoisyDamageRepair;
|
|
static bool gNoisyIntrinsic;
|
|
static bool gNoisyReflow;
|
|
static bool gReallyNoisyReflow;
|
|
static bool gNoisyFloatManager;
|
|
static bool gVerifyLines;
|
|
static bool gDisableResizeOpt;
|
|
|
|
static int32_t gNoiseIndent;
|
|
|
|
static const char* kReflowCommandType[];
|
|
|
|
protected:
|
|
static void InitDebugFlags();
|
|
#endif
|
|
};
|
|
|
|
#ifdef DEBUG
|
|
class AutoNoisyIndenter {
|
|
public:
|
|
AutoNoisyIndenter(bool aDoIndent) : mIndented(aDoIndent) {
|
|
if (mIndented) {
|
|
nsBlockFrame::gNoiseIndent++;
|
|
}
|
|
}
|
|
~AutoNoisyIndenter() {
|
|
if (mIndented) {
|
|
nsBlockFrame::gNoiseIndent--;
|
|
}
|
|
}
|
|
private:
|
|
bool mIndented;
|
|
};
|
|
#endif
|
|
|
|
/**
|
|
* Iterates over all lines in the prev-in-flows/next-in-flows of this block.
|
|
*/
|
|
class nsBlockInFlowLineIterator {
|
|
public:
|
|
typedef nsBlockFrame::line_iterator line_iterator;
|
|
/**
|
|
* Set up the iterator to point to aLine which must be a normal line
|
|
* in aFrame (not an overflow line).
|
|
*/
|
|
nsBlockInFlowLineIterator(nsBlockFrame* aFrame, line_iterator aLine);
|
|
/**
|
|
* Set up the iterator to point to the first line found starting from
|
|
* aFrame. Sets aFoundValidLine to false if there is no such line.
|
|
* After aFoundValidLine has returned false, don't call any methods on this
|
|
* object again.
|
|
*/
|
|
nsBlockInFlowLineIterator(nsBlockFrame* aFrame, bool* aFoundValidLine);
|
|
/**
|
|
* Set up the iterator to point to the line that contains aFindFrame (either
|
|
* directly or indirectly). If aFrame is out of flow, or contained in an
|
|
* out-of-flow, finds the line containing the out-of-flow's placeholder. If
|
|
* the frame is not found, sets aFoundValidLine to false. After
|
|
* aFoundValidLine has returned false, don't call any methods on this
|
|
* object again.
|
|
*/
|
|
nsBlockInFlowLineIterator(nsBlockFrame* aFrame, nsIFrame* aFindFrame,
|
|
bool* aFoundValidLine);
|
|
|
|
line_iterator GetLine() { return mLine; }
|
|
bool IsLastLineInList();
|
|
nsBlockFrame* GetContainer() { return mFrame; }
|
|
bool GetInOverflow() { return mLineList != &mFrame->mLines; }
|
|
|
|
/**
|
|
* Returns the current line list we're iterating, null means
|
|
* we're iterating |mLines| of the container.
|
|
*/
|
|
nsLineList* GetLineList() { return mLineList; }
|
|
|
|
/**
|
|
* Returns the end-iterator of whatever line list we're in.
|
|
*/
|
|
line_iterator End();
|
|
|
|
/**
|
|
* Returns false if there are no more lines. After this has returned false,
|
|
* don't call any methods on this object again.
|
|
*/
|
|
bool Next();
|
|
/**
|
|
* Returns false if there are no more lines. After this has returned false,
|
|
* don't call any methods on this object again.
|
|
*/
|
|
bool Prev();
|
|
|
|
private:
|
|
friend class nsBlockFrame;
|
|
// XXX nsBlockFrame uses this internally in one place. Try to remove it.
|
|
nsBlockInFlowLineIterator(nsBlockFrame* aFrame, line_iterator aLine, bool aInOverflow);
|
|
|
|
nsBlockFrame* mFrame;
|
|
line_iterator mLine;
|
|
nsLineList* mLineList; // the line list mLine is in
|
|
|
|
/**
|
|
* Moves iterator to next valid line reachable from the current block.
|
|
* Returns false if there are no valid lines.
|
|
*/
|
|
bool FindValidLine();
|
|
};
|
|
|
|
#endif /* nsBlockFrame_h___ */
|