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