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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>
* Mats Palmgren <mats.palmgren@bredband.net>
* 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 "nsLineBox.h"
#include "gfxFont.h"
#include "gfxSkipChars.h"
#include "gfxContext.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 0x02000000
class nsTextFrame : public nsFrame {
public:
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 Destroy();
NS_IMETHOD GetCursor(const nsPoint& aPoint,
nsIFrame::Cursor& aCursor);
NS_IMETHOD CharacterDataChanged(nsPresContext* aPresContext,
nsIContent* aChild,
PRBool aAppend);
NS_IMETHOD DidSetStyleContext();
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 PRBool 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);
NS_IMETHOD SetSelected(nsPresContext* aPresContext,
nsIDOMRange *aRange,
PRBool aSelected,
nsSpread aSpread);
virtual PRBool PeekOffsetNoAmount(PRBool aForward, PRInt32* aOffset);
virtual PRBool PeekOffsetCharacter(PRBool aForward, PRInt32* aOffset);
virtual PRBool PeekOffsetWord(PRBool aForward, PRBool aWordSelectEatSpace, PRBool aIsKeyboardSelect,
PRInt32* aOffset, PeekWordState* aState);
NS_IMETHOD CheckVisibility(nsPresContext* aContext, PRInt32 aStartIndex, PRInt32 aEndIndex, PRBool aRecurse, PRBool *aFinished, PRBool *_retval);
// Update offsets to account for new length. This may clear mTextRun.
void SetLength(PRInt32 aLength);
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,
PRBool inHint,
PRInt32* outFrameContentOffset,
nsIFrame* *outChildFrame);
virtual PRBool IsVisibleInSelection(nsISelection* aSelection);
virtual PRBool IsEmpty();
virtual PRBool IsSelfEmpty() { return IsEmpty(); }
/**
* @return PR_TRUE if this text frame ends with a newline character. It
* should return PR_FALSE if this is not a text frame.
*/
virtual PRBool HasTerminalNewline() const;
/**
* Returns true if this text frame is logically adjacent to the end of the
* line.
*/
PRBool IsAtEndOfLine() const;
/**
* Call this only after reflow the frame. Returns true if non-collapsed
* characters are present.
*/
PRBool HasNoncollapsedCharacters() const {
return (GetStateBits() & TEXT_HAS_NONCOLLAPSED_CHARACTERS) != 0;
}
#ifdef ACCESSIBILITY
NS_IMETHOD GetAccessible(nsIAccessible** aAccessible);
#endif
virtual void MarkIntrinsicWidthsDirty();
virtual nscoord GetMinWidth(nsIRenderingContext *aRenderingContext);
virtual nscoord GetPrefWidth(nsIRenderingContext *aRenderingContext);
virtual void AddInlineMinWidth(nsIRenderingContext *aRenderingContext,
InlineMinWidthData *aData);
virtual void AddInlinePrefWidth(nsIRenderingContext *aRenderingContext,
InlinePrefWidthData *aData);
virtual nsSize ComputeSize(nsIRenderingContext *aRenderingContext,
nsSize aCBSize, nscoord aAvailableWidth,
nsSize aMargin, nsSize aBorder, nsSize aPadding,
PRBool aShrinkWrap);
virtual nsRect ComputeTightBounds(gfxContext* aContext) const;
NS_IMETHOD Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus);
virtual PRBool 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 RecomputeOverflowRect on this frame.
PRPackedBool 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.
PRPackedBool mLastCharIsJustifiable;
// an amount to *subtract* from the frame's width (zero if !mChanged)
nscoord mDeltaWidth;
};
TrimOutput TrimTrailingWhiteSpace(nsIRenderingContext* aRC);
virtual nsresult GetRenderedText(nsAString* aString = nsnull,
gfxSkipChars* aSkipChars = nsnull,
gfxSkipCharsIterator* aSkipIter = nsnull,
PRUint32 aSkippedStartOffset = 0,
PRUint32 aSkippedMaxLength = PR_UINT32_MAX);
nsRect RecomputeOverflowRect();
void AddInlineMinWidthForFlow(nsIRenderingContext *aRenderingContext,
nsIFrame::InlineMinWidthData *aData);
void AddInlinePrefWidthForFlow(nsIRenderingContext *aRenderingContext,
InlinePrefWidthData *aData);
gfxFloat GetSnappedBaselineY(gfxContext* aContext, gfxFloat aY);
// primary frame paint method called from nsDisplayText
// The private DrawText() is what applies the text to a graphics context
void PaintText(nsIRenderingContext* aRenderingContext, nsPoint aPt,
const nsRect& aDirtyRect);
// helper: paint quirks-mode CSS text decorations
void PaintTextDecorations(gfxContext* aCtx, const gfxRect& aDirtyRect,
const gfxPoint& aFramePt,
const gfxPoint& aTextBaselinePt,
nsTextPaintStyle& aTextStyle,
PropertyProvider& aProvider,
const nscolor& aOverrideColor = 0);
// helper: paint text frame when we're impacted by at least one selection.
// Return PR_FALSE if the text was not painted and we should continue with
// the fast path.
PRBool PaintTextWithSelection(gfxContext* aCtx,
const gfxPoint& aFramePt,
const gfxPoint& aTextBaselinePt,
const gfxRect& aDirtyRect,
PropertyProvider& aProvider,
nsTextPaintStyle& aTextPaintStyle);
// 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.
void PaintTextWithSelectionColors(gfxContext* aCtx,
const gfxPoint& aFramePt,
const gfxPoint& aTextBaselinePt,
const gfxRect& aDirtyRect,
PropertyProvider& aProvider,
nsTextPaintStyle& aTextPaintStyle,
SelectionDetails* aDetails,
SelectionType* aAllTypes);
// helper: paint text decorations for text selected by aSelectionType
void PaintTextSelectionDecorations(gfxContext* aCtx,
const gfxPoint& aFramePt,
const gfxPoint& aTextBaselinePt,
const gfxRect& aDirtyRect,
PropertyProvider& aProvider,
nsTextPaintStyle& aTextPaintStyle,
SelectionDetails* aDetails,
SelectionType aSelectionType);
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();
// Clears out mTextRun from this frame and all other frames that hold a reference
// to it, then deletes the textrun.
void ClearTextRun();
/**
* Acquires the text run for this content, if necessary.
* @param aRC 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 aBlock the block ancestor for this frame, or nsnull if unknown
* @param aLine the line that this frame is on, if any, 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(gfxContext* aReferenceContext = nsnull,
nsIFrame* aLineContainer = nsnull,
const nsLineList::iterator* aLine = nsnull,
PRUint32* aFlowEndInTextRun = nsnull);
gfxTextRun* GetTextRun() { return mTextRun; }
void SetTextRun(gfxTextRun* aTextRun) { mTextRun = aTextRun; }
// 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,
PRBool aTrimAfter);
protected:
virtual ~nsTextFrame();
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;
// 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 AdjustSelectionPointsForBidi(SelectionDetails *sdptr,
PRInt32 textLength,
PRBool isRTLChars,
PRBool isOddLevel,
PRBool isBidiSystem);
void UnionTextDecorationOverflow(nsPresContext* aPresContext,
PropertyProvider& aProvider,
nsRect* aOverflowRect);
void DrawText(gfxContext* aCtx,
const gfxPoint& aTextBaselinePt,
PRUint32 aOffset,
PRUint32 aLength,
const gfxRect* aDirtyRect,
PropertyProvider* aProvider,
gfxFloat& aAdvanceWidth,
PRBool aDrawSoftHyphen);
void PaintOneShadow(PRUint32 aOffset,
PRUint32 aLength,
nsCSSShadowItem* aShadowDetails,
PropertyProvider* aProvider,
const gfxRect& aDirtyRect,
const gfxPoint& aFramePt,
const gfxPoint& aTextBaselinePt,
gfxContext* aCtx,
const nscolor& aForegroundColor);
struct TextDecorations {
PRUint8 mDecorations;
nscolor mOverColor;
nscolor mUnderColor;
nscolor mStrikeColor;
TextDecorations() :
mDecorations(0), mOverColor(NS_RGB(0, 0, 0)),
mUnderColor(NS_RGB(0, 0, 0)), mStrikeColor(NS_RGB(0, 0, 0))
{ }
PRBool HasDecorationlines() {
return !!(mDecorations & (NS_STYLE_TEXT_DECORATION_UNDERLINE |
NS_STYLE_TEXT_DECORATION_OVERLINE |
NS_STYLE_TEXT_DECORATION_LINE_THROUGH));
}
PRBool HasUnderline() {
return !!(mDecorations & NS_STYLE_TEXT_DECORATION_UNDERLINE);
}
PRBool HasOverline() {
return !!(mDecorations & NS_STYLE_TEXT_DECORATION_OVERLINE);
}
PRBool HasStrikeout() {
return !!(mDecorations & NS_STYLE_TEXT_DECORATION_LINE_THROUGH);
}
};
TextDecorations GetTextDecorations(nsPresContext* aPresContext);
PRBool HasSelectionOverflowingDecorations(nsPresContext* aPresContext,
float* aRatio = nsnull);
PRBool IsFloatingFirstLetterChild();
};
#endif
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