/* -*- 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 * Roger B. Sidje * Pierre Phaneuf * Prabhat Hegde * Tomi Leppikangas * Roland Mainz * Daniel Glazman * Neil Deakin * Masayuki Nakano * Mats Palmgren * Uri Bernstein * Stephen Blackheath * * 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" 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) 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 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); 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 */ virtual void SetSelected(PRBool aSelected, SelectionType aType); void SetSelectedRange(PRUint32 aStart, PRUint32 aEnd, PRBool aSelected, SelectionType aType); 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, nsLineLayout* aLineLayout); 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 virtual already_AddRefed CreateAccessible(); #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 = nsnull); // 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); 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(); // 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 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 nsRect& 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); // 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 PR_TRUE. PRBool CombineSelectionUnderlineRect(nsPresContext* aPresContext, nsRect& aRect); PRBool IsFloatingFirstLetterChild(); ContentOffsets GetCharacterOffsetAtFramePointInternal(const nsPoint &aPoint, PRBool aForInsertionPoint); void ClearFrameOffsetCache(); }; #endif