gecko/layout/generic/nsTextFrame.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Robert O'Callahan <robert@ocallahan.org>
* Roger B. Sidje <rbs@maths.uq.edu.au>
* Pierre Phaneuf <pp@ludusdesign.com>
* Prabhat Hegde <prabhat.hegde@sun.com>
* Tomi Leppikangas <tomi.leppikangas@oulu.fi>
* Roland Mainz <roland.mainz@informatik.med.uni-giessen.de>
* Daniel Glazman <glazman@netscape.com>
* Neil Deakin <neil@mozdevgroup.com>
* Masayuki Nakano <masayuki@d-toybox.com>
2010-10-14 21:03:33 -07:00
* Mats Palmgren <matspal@gmail.com>
* Uri Bernstein <uriber@gmail.com>
* Stephen Blackheath <entangled.mooched.stephen@blacksapphire.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsTextFrame_h__
#define nsTextFrame_h__
#include "nsFrame.h"
#include "nsSplittableFrame.h"
#include "nsLineBox.h"
#include "gfxFont.h"
#include "gfxSkipChars.h"
#include "gfxContext.h"
#include "nsDisplayList.h"
class nsTextPaintStyle;
class PropertyProvider;
// This state bit is set on frames that have some non-collapsed characters after
// reflow
#define TEXT_HAS_NONCOLLAPSED_CHARACTERS NS_FRAME_STATE_BIT(31)
#define TEXT_HAS_FONT_INFLATION NS_FRAME_STATE_BIT(61)
class nsTextFrame : public nsFrame {
public:
NS_DECL_FRAMEARENA_HELPERS
friend class nsContinuingTextFrame;
nsTextFrame(nsStyleContext* aContext)
: nsFrame(aContext)
{
NS_ASSERTION(mContentOffset == 0, "Bogus content offset");
}
// nsIFrame
NS_IMETHOD BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists);
NS_IMETHOD Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow);
virtual void DestroyFrom(nsIFrame* aDestructRoot);
NS_IMETHOD GetCursor(const nsPoint& aPoint,
nsIFrame::Cursor& aCursor);
NS_IMETHOD CharacterDataChanged(CharacterDataChangeInfo* aInfo);
virtual void DidSetStyleContext(nsStyleContext* aOldStyleContext);
virtual nsIFrame* GetNextContinuation() const {
return mNextContinuation;
}
NS_IMETHOD SetNextContinuation(nsIFrame* aNextContinuation) {
NS_ASSERTION (!aNextContinuation || GetType() == aNextContinuation->GetType(),
"setting a next continuation with incorrect type!");
NS_ASSERTION (!nsSplittableFrame::IsInNextContinuationChain(aNextContinuation, this),
"creating a loop in continuation chain!");
mNextContinuation = aNextContinuation;
if (aNextContinuation)
aNextContinuation->RemoveStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
return NS_OK;
}
virtual nsIFrame* GetNextInFlowVirtual() const { return GetNextInFlow(); }
nsIFrame* GetNextInFlow() const {
return mNextContinuation && (mNextContinuation->GetStateBits() & NS_FRAME_IS_FLUID_CONTINUATION) ?
mNextContinuation : nsnull;
}
NS_IMETHOD SetNextInFlow(nsIFrame* aNextInFlow) {
NS_ASSERTION (!aNextInFlow || GetType() == aNextInFlow->GetType(),
"setting a next in flow with incorrect type!");
NS_ASSERTION (!nsSplittableFrame::IsInNextContinuationChain(aNextInFlow, this),
"creating a loop in continuation chain!");
mNextContinuation = aNextInFlow;
if (aNextInFlow)
aNextInFlow->AddStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
return NS_OK;
}
virtual nsIFrame* GetLastInFlow() const;
virtual nsIFrame* GetLastContinuation() const;
virtual nsSplittableType GetSplittableType() const {
return NS_FRAME_SPLITTABLE;
}
/**
* Get the "type" of the frame
*
* @see nsGkAtoms::textFrame
*/
virtual nsIAtom* GetType() const;
virtual bool IsFrameOfType(PRUint32 aFlags) const
{
// Set the frame state bit for text frames to mark them as replaced.
// XXX kipp: temporary
return nsFrame::IsFrameOfType(aFlags & ~(nsIFrame::eReplaced |
nsIFrame::eLineParticipant));
}
#ifdef DEBUG
NS_IMETHOD List(FILE* out, PRInt32 aIndent) const;
NS_IMETHOD GetFrameName(nsAString& aResult) const;
NS_IMETHOD_(nsFrameState) GetDebugStateBits() const ;
#endif
virtual ContentOffsets CalcContentOffsetsFromFramePoint(nsPoint aPoint);
ContentOffsets GetCharacterOffsetAtFramePoint(const nsPoint &aPoint);
/**
* This is called only on the primary text frame. It indicates that
* the selection state of the given character range has changed.
* Text in the range is unconditionally invalidated
* (nsTypedSelection::Repaint depends on this).
* @param aSelected true if the selection has been added to the range,
* false otherwise
* @param aType the type of selection added or removed
*/
void SetSelectedRange(PRUint32 aStart, PRUint32 aEnd, bool aSelected,
SelectionType aType);
virtual bool PeekOffsetNoAmount(bool aForward, PRInt32* aOffset);
virtual bool PeekOffsetCharacter(bool aForward, PRInt32* aOffset,
bool aRespectClusters = true);
virtual bool PeekOffsetWord(bool aForward, bool aWordSelectEatSpace, bool aIsKeyboardSelect,
PRInt32* aOffset, PeekWordState* aState);
NS_IMETHOD CheckVisibility(nsPresContext* aContext, PRInt32 aStartIndex, PRInt32 aEndIndex, bool aRecurse, bool *aFinished, bool *_retval);
// Flags for aSetLengthFlags
enum { ALLOW_FRAME_CREATION_AND_DESTRUCTION = 0x01 };
// Update offsets to account for new length. This may clear mTextRun.
void SetLength(PRInt32 aLength, nsLineLayout* aLineLayout,
PRUint32 aSetLengthFlags = 0);
NS_IMETHOD GetOffsets(PRInt32 &start, PRInt32 &end)const;
virtual void AdjustOffsetsForBidi(PRInt32 start, PRInt32 end);
NS_IMETHOD GetPointFromOffset(PRInt32 inOffset,
nsPoint* outPoint);
NS_IMETHOD GetChildFrameContainingOffset(PRInt32 inContentOffset,
bool inHint,
PRInt32* outFrameContentOffset,
nsIFrame* *outChildFrame);
virtual bool IsVisibleInSelection(nsISelection* aSelection);
virtual bool IsEmpty();
virtual bool IsSelfEmpty() { return IsEmpty(); }
virtual nscoord GetBaseline() const;
/**
* @return true if this text frame ends with a newline character. It
* should return false if this is not a text frame.
*/
virtual bool HasTerminalNewline() const;
/**
* Returns true if this text frame is logically adjacent to the end of the
* line.
*/
bool IsAtEndOfLine() const;
/**
* Call this only after reflow the frame. Returns true if non-collapsed
* characters are present.
*/
bool HasNoncollapsedCharacters() const {
return (GetStateBits() & TEXT_HAS_NONCOLLAPSED_CHARACTERS) != 0;
}
#ifdef ACCESSIBILITY
virtual already_AddRefed<nsAccessible> CreateAccessible();
#endif
float GetFontSizeInflation() const;
bool HasFontSizeInflation() const {
return (GetStateBits() & TEXT_HAS_FONT_INFLATION) != 0;
}
void SetFontSizeInflation(float aInflation);
virtual void MarkIntrinsicWidthsDirty();
virtual nscoord GetMinWidth(nsRenderingContext *aRenderingContext);
virtual nscoord GetPrefWidth(nsRenderingContext *aRenderingContext);
virtual void AddInlineMinWidth(nsRenderingContext *aRenderingContext,
InlineMinWidthData *aData);
virtual void AddInlinePrefWidth(nsRenderingContext *aRenderingContext,
InlinePrefWidthData *aData);
virtual nsSize ComputeSize(nsRenderingContext *aRenderingContext,
nsSize aCBSize, nscoord aAvailableWidth,
nsSize aMargin, nsSize aBorder, nsSize aPadding,
PRUint32 aFlags) MOZ_OVERRIDE;
virtual nsRect ComputeTightBounds(gfxContext* aContext) const;
NS_IMETHOD Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus);
virtual bool CanContinueTextRun() const;
// Method that is called for a text frame that is logically
// adjacent to the end of the line (i.e. followed only by empty text frames,
// placeholders or inlines containing such).
struct TrimOutput {
// true if we trimmed some space or changed metrics in some other way.
// In this case, we should call RecomputeOverflow on this frame.
bool mChanged;
// true if the last character is not justifiable so should be subtracted
// from the count of justifiable characters in the frame, since the last
// character in a line is not justifiable.
bool mLastCharIsJustifiable;
// an amount to *subtract* from the frame's width (zero if !mChanged)
nscoord mDeltaWidth;
};
TrimOutput TrimTrailingWhiteSpace(nsRenderingContext* aRC);
virtual nsresult GetRenderedText(nsAString* aString = nsnull,
gfxSkipChars* aSkipChars = nsnull,
gfxSkipCharsIterator* aSkipIter = nsnull,
PRUint32 aSkippedStartOffset = 0,
PRUint32 aSkippedMaxLength = PR_UINT32_MAX);
nsOverflowAreas
RecomputeOverflow(const nsHTMLReflowState& aBlockReflowState);
enum TextRunType {
// Anything in reflow (but not intrinsic width calculation) or
// painting should use the inflated text run (i.e., with font size
// inflation applied).
eInflated,
// Intrinsic width calculation should use the non-inflated text run.
// When there is font size inflation, it will be different.
eNotInflated
};
void AddInlineMinWidthForFlow(nsRenderingContext *aRenderingContext,
nsIFrame::InlineMinWidthData *aData,
float aInflation, TextRunType aTextRunType);
void AddInlinePrefWidthForFlow(nsRenderingContext *aRenderingContext,
InlinePrefWidthData *aData,
float aInflation, TextRunType aTextRunType);
/**
* Calculate the horizontal bounds of the grapheme clusters that fit entirely
* inside the given left/right edges (which are positive lengths from the
* respective frame edge). If an input value is zero it is ignored and the
* result for that edge is zero. All out parameter values are undefined when
* the method returns false.
* @return true if at least one whole grapheme cluster fit between the edges
*/
bool MeasureCharClippedText(nscoord aLeftEdge, nscoord aRightEdge,
nscoord* aSnappedLeftEdge,
nscoord* aSnappedRightEdge);
/**
* Same as above; this method also the returns the corresponding text run
* offset and number of characters that fit. All out parameter values are
* undefined when the method returns false.
* @return true if at least one whole grapheme cluster fit between the edges
*/
bool MeasureCharClippedText(PropertyProvider& aProvider,
nscoord aLeftEdge, nscoord aRightEdge,
PRUint32* aStartOffset, PRUint32* aMaxLength,
nscoord* aSnappedLeftEdge,
nscoord* aSnappedRightEdge);
// primary frame paint method called from nsDisplayText
// The private DrawText() is what applies the text to a graphics context
void PaintText(nsRenderingContext* aRenderingContext, nsPoint aPt,
const nsRect& aDirtyRect, const nsCharClipDisplayItem& aItem);
// helper: paint text frame when we're impacted by at least one selection.
// Return false if the text was not painted and we should continue with
// the fast path.
bool PaintTextWithSelection(gfxContext* aCtx,
const gfxPoint& aFramePt,
const gfxPoint& aTextBaselinePt,
const gfxRect& aDirtyRect,
PropertyProvider& aProvider,
PRUint32 aContentOffset,
PRUint32 aContentLength,
nsTextPaintStyle& aTextPaintStyle,
const nsCharClipDisplayItem::ClipEdges& aClipEdges);
// helper: paint text with foreground and background colors determined
// by selection(s). Also computes a mask of all selection types applying to
// our text, returned in aAllTypes.
// Return false if the text was not painted and we should continue with
// the fast path.
bool PaintTextWithSelectionColors(gfxContext* aCtx,
const gfxPoint& aFramePt,
const gfxPoint& aTextBaselinePt,
const gfxRect& aDirtyRect,
PropertyProvider& aProvider,
PRUint32 aContentOffset,
PRUint32 aContentLength,
nsTextPaintStyle& aTextPaintStyle,
SelectionDetails* aDetails,
SelectionType* aAllTypes,
const nsCharClipDisplayItem::ClipEdges& aClipEdges);
// helper: paint text decorations for text selected by aSelectionType
void PaintTextSelectionDecorations(gfxContext* aCtx,
const gfxPoint& aFramePt,
const gfxPoint& aTextBaselinePt,
const gfxRect& aDirtyRect,
PropertyProvider& aProvider,
PRUint32 aContentOffset,
PRUint32 aContentLength,
nsTextPaintStyle& aTextPaintStyle,
SelectionDetails* aDetails,
SelectionType aSelectionType);
virtual nscolor GetCaretColorAt(PRInt32 aOffset);
PRInt16 GetSelectionStatus(PRInt16* aSelectionFlags);
#ifdef DEBUG
void ToCString(nsCString& aBuf, PRInt32* aTotalContentLength) const;
#endif
PRInt32 GetContentOffset() const { return mContentOffset; }
PRInt32 GetContentLength() const
{
NS_ASSERTION(GetContentEnd() - mContentOffset >= 0, "negative length");
return GetContentEnd() - mContentOffset;
}
PRInt32 GetContentEnd() const;
// This returns the length the frame thinks it *should* have after it was
// last reflowed (0 if it hasn't been reflowed yet). This should be used only
// when setting up the text offsets for a new continuation frame.
PRInt32 GetContentLengthHint() const { return mContentLengthHint; }
// Compute the length of the content mapped by this frame
// and all its in-flow siblings. Basically this means starting at mContentOffset
// and going to the end of the text node or the next bidi continuation
// boundary.
PRInt32 GetInFlowContentLength();
/**
* Acquires the text run for this content, if necessary.
* @param aWhichTextRun indicates whether to get an inflated or non-inflated
* text run
* @param aInflation the text inflation scale
* @param aReferenceContext the rendering context to use as a reference for
* creating the textrun, if available (if not, we'll create one which will
* just be slower)
* @param aLineContainer the block ancestor for this frame, or nsnull if
* unknown
* @param aFlowEndInTextRun if non-null, this returns the textrun offset of
* end of the text associated with this frame and its in-flow siblings
* @return a gfxSkipCharsIterator set up to map DOM offsets for this frame
* to offsets into the textrun; its initial offset is set to this frame's
* content offset
*/
gfxSkipCharsIterator EnsureTextRun(TextRunType aWhichTextRun,
float aInflation,
gfxContext* aReferenceContext = nsnull,
nsIFrame* aLineContainer = nsnull,
const nsLineList::iterator* aLine = nsnull,
PRUint32* aFlowEndInTextRun = nsnull);
// Since we can't reference |this| in default arguments:
gfxSkipCharsIterator EnsureTextRun(TextRunType aWhichTextRun) {
return EnsureTextRun(aWhichTextRun,
(aWhichTextRun == eInflated)
? GetFontSizeInflation() : 1.0f);
}
gfxTextRun* GetTextRun(TextRunType aWhichTextRun) {
if (aWhichTextRun == eInflated || !HasFontSizeInflation())
return mTextRun;
return GetUninflatedTextRun();
}
gfxTextRun* GetUninflatedTextRun();
void SetTextRun(gfxTextRun* aTextRun, TextRunType aWhichTextRun,
float aInflation);
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/**
* Notify the frame that it should drop its pointer to a text run.
* Returns whether the text run was removed (i.e., whether it was
* associated with this frame, either as its inflated or non-inflated
* text run.
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*/
bool RemoveTextRun(gfxTextRun* aTextRun);
/**
* Clears out |mTextRun| (or the uninflated text run, when aInflated
* is nsTextFrame::eNotInflated and there is inflation) from all frames that hold a
* reference to it, starting at |aStartContinuation|, or if it's
* nsnull, starting at |this|. Deletes the text run if all references
* were cleared and it's not cached.
*/
void ClearTextRun(nsTextFrame* aStartContinuation,
TextRunType aWhichTextRun);
void ClearTextRuns() {
ClearTextRun(nsnull, nsTextFrame::eInflated);
ClearTextRun(nsnull, nsTextFrame::eNotInflated);
}
// Get the DOM content range mapped by this frame after excluding
// whitespace subject to start-of-line and end-of-line trimming.
// The textrun must have been created before calling this.
struct TrimmedOffsets {
PRInt32 mStart;
PRInt32 mLength;
PRInt32 GetEnd() { return mStart + mLength; }
};
TrimmedOffsets GetTrimmedOffsets(const nsTextFragment* aFrag,
bool aTrimAfter);
// Similar to Reflow(), but for use from nsLineLayout
void ReflowText(nsLineLayout& aLineLayout, nscoord aAvailableWidth,
nsRenderingContext* aRenderingContext, bool aShouldBlink,
nsHTMLReflowMetrics& aMetrics, nsReflowStatus& aStatus);
bool IsFloatingFirstLetterChild() const;
protected:
virtual ~nsTextFrame();
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nsIFrame* mNextContinuation;
// The key invariant here is that mContentOffset never decreases along
// a next-continuation chain. And of course mContentOffset is always <= the
// the text node's content length, and the mContentOffset for the first frame
// is always 0. Furthermore the text mapped by a frame is determined by
// GetContentOffset() and GetContentLength()/GetContentEnd(), which get
// the length from the difference between this frame's offset and the next
// frame's offset, or the text length if there is no next frame. This means
// the frames always map the text node without overlapping or leaving any gaps.
PRInt32 mContentOffset;
// This does *not* indicate the length of text currently mapped by the frame;
// instead it's a hint saying that this frame *wants* to map this much text
// so if we create a new continuation, this is where that continuation should
// start.
PRInt32 mContentLengthHint;
nscoord mAscent;
gfxTextRun* mTextRun;
/**
* Return true if the frame is part of a Selection.
* Helper method to implement the public IsSelected() API.
*/
virtual bool IsFrameSelected() const;
// The caller of this method must call DestroySelectionDetails() on the
// return value, if that return value is not null. Calling
// DestroySelectionDetails() on a null value is still OK, just not necessary.
SelectionDetails* GetSelectionDetails();
void UnionAdditionalOverflow(nsPresContext* aPresContext,
const nsHTMLReflowState& aBlockReflowState,
PropertyProvider& aProvider,
nsRect* aVisualOverflowRect,
bool aIncludeTextDecorations);
void PaintOneShadow(PRUint32 aOffset,
PRUint32 aLength,
nsCSSShadowItem* aShadowDetails,
PropertyProvider* aProvider,
const nsRect& aDirtyRect,
const gfxPoint& aFramePt,
const gfxPoint& aTextBaselinePt,
gfxContext* aCtx,
const nscolor& aForegroundColor,
const nsCharClipDisplayItem::ClipEdges& aClipEdges,
nscoord aLeftSideOffset);
struct LineDecoration {
nsIFrame* mFrame;
// This is represents the offset from our baseline to mFrame's baseline;
// positive offsets are *above* the baseline and negative offsets below
nscoord mBaselineOffset;
nscolor mColor;
PRUint8 mStyle;
LineDecoration(nsIFrame *const aFrame,
const nscoord aOff,
const nscolor aColor,
const PRUint8 aStyle)
: mFrame(aFrame),
mBaselineOffset(aOff),
mColor(aColor),
mStyle(aStyle)
{}
LineDecoration(const LineDecoration& aOther)
: mFrame(aOther.mFrame),
mBaselineOffset(aOther.mBaselineOffset),
mColor(aOther.mColor),
mStyle(aOther.mStyle)
{}
bool operator==(const LineDecoration& aOther) const {
return mFrame == aOther.mFrame &&
mStyle == aOther.mStyle &&
mColor == aOther.mColor &&
mBaselineOffset == aOther.mBaselineOffset;
}
};
struct TextDecorations {
nsAutoTArray<LineDecoration, 1> mOverlines, mUnderlines, mStrikes;
TextDecorations() { }
bool HasDecorationLines() const {
return HasUnderline() || HasOverline() || HasStrikeout();
}
bool HasUnderline() const {
return !mUnderlines.IsEmpty();
}
bool HasOverline() const {
return !mOverlines.IsEmpty();
}
bool HasStrikeout() const {
return !mStrikes.IsEmpty();
}
};
void GetTextDecorations(nsPresContext* aPresContext,
TextDecorations& aDecorations);
void DrawTextRun(gfxContext* const aCtx,
const gfxPoint& aTextBaselinePt,
PRUint32 aOffset,
PRUint32 aLength,
PropertyProvider& aProvider,
gfxFloat& aAdvanceWidth,
bool aDrawSoftHyphen);
void DrawTextRunAndDecorations(gfxContext* const aCtx,
const gfxRect& aDirtyRect,
const gfxPoint& aFramePt,
const gfxPoint& aTextBaselinePt,
PRUint32 aOffset,
PRUint32 aLength,
PropertyProvider& aProvider,
const nsTextPaintStyle& aTextStyle,
const nsCharClipDisplayItem::ClipEdges& aClipEdges,
gfxFloat& aAdvanceWidth,
bool aDrawSoftHyphen,
const TextDecorations& aDecorations,
const nscolor* const aDecorationOverrideColor);
void DrawText(gfxContext* const aCtx,
const gfxRect& aDirtyRect,
const gfxPoint& aFramePt,
const gfxPoint& aTextBaselinePt,
PRUint32 aOffset,
PRUint32 aLength,
PropertyProvider& aProvider,
const nsTextPaintStyle& aTextStyle,
const nsCharClipDisplayItem::ClipEdges& aClipEdges,
gfxFloat& aAdvanceWidth,
bool aDrawSoftHyphen,
const nscolor* const aDecorationOverrideColor = nsnull);
// Set non empty rect to aRect, it should be overflow rect or frame rect.
// If the result rect is larger than the given rect, this returns true.
bool CombineSelectionUnderlineRect(nsPresContext* aPresContext,
nsRect& aRect);
ContentOffsets GetCharacterOffsetAtFramePointInternal(const nsPoint &aPoint,
bool aForInsertionPoint);
void ClearFrameOffsetCache();
virtual bool HasAnyNoncollapsedCharacters();
void ClearMetrics(nsHTMLReflowMetrics& aMetrics);
};
#endif