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https://github.com/mozilla/gecko-dev.git
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419 lines
10 KiB
C++
419 lines
10 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is Mozilla Communicator client code.
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*
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* The Initial Developer of the Original Code is Netscape Communications
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* Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#ifndef nsLineBox_h___
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#define nsLineBox_h___
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#include "nsVoidArray.h"
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#include "nsPlaceholderFrame.h"
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#include "nsILineIterator.h"
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#include "nsISizeOfHandler.h"
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class nsISpaceManager;
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class nsLineBox;
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class nsFloaterCache;
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class nsFloaterCacheList;
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class nsFloaterCacheFreeList;
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// State cached after reflowing a floater. This state is used during
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// incremental reflow when we avoid reflowing a floater.
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class nsFloaterCache {
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public:
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nsFloaterCache();
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#ifdef DEBUG
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~nsFloaterCache();
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#else
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~nsFloaterCache() { }
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#endif
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nsFloaterCache* Next() const { return mNext; }
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nsPlaceholderFrame* mPlaceholder; // nsPlaceholderFrame
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// This will be true if the floater was placed on the current line
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// instead of below the current line.
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PRBool mIsCurrentLineFloater;
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nsMargin mMargins; // computed margins
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nsMargin mOffsets; // computed offsets (relative pos)
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// Region in the spacemanager impacted by this floater; the
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// coordinates are relative to the containing block frame. The
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// region includes the margins around the floater, but doesn't
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// include the relative offsets.
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nsRect mRegion;
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// Combined area for the floater. This will not include the margins
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// for the floater. Like mRegion, the coordinates are relative to
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// the containing block frame.
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nsRect mCombinedArea;
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protected:
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nsFloaterCache* mNext;
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friend class nsFloaterCacheList;
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friend class nsFloaterCacheFreeList;
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};
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//----------------------------------------
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class nsFloaterCacheList {
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public:
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nsFloaterCacheList() : mHead(nsnull) { }
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~nsFloaterCacheList();
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PRBool IsEmpty() const {
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return nsnull == mHead;
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}
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PRBool NotEmpty() const {
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return nsnull != mHead;
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}
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nsFloaterCache* Head() const {
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return mHead;
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}
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nsFloaterCache* Tail() const;
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nsFloaterCache* Find(nsIFrame* aOutOfFlowFrame);
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void Remove(nsFloaterCache* aElement);
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void Append(nsFloaterCacheFreeList& aList);
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#ifdef DEBUG
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void SizeOf(nsISizeOfHandler* aHandler, PRUint32* aResult) const;
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#endif
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protected:
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nsFloaterCache* mHead;
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friend class nsFloaterCacheFreeList;
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};
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//---------------------------------------
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class nsFloaterCacheFreeList : public nsFloaterCacheList {
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public:
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nsFloaterCacheFreeList() : mTail(nsnull) { }
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~nsFloaterCacheFreeList() { }
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// Steal away aList's nsFloaterCache objects and put them on this
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// free-list.
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void Append(nsFloaterCacheList& aList);
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void Append(nsFloaterCache* aFloaterCache);
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// Allocate a new nsFloaterCache object
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nsFloaterCache* Alloc();
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protected:
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nsFloaterCache* mTail;
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friend class nsFloaterCacheList;
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};
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//----------------------------------------------------------------------
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#define LINE_MAX_BREAK_TYPE ((1 << 4) - 1)
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#define LINE_MAX_CHILD_COUNT ((1 << 24) - 1)
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#if NS_STYLE_CLEAR_LAST_VALUE > 15
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need to rearrange the mBits bitfield;
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#endif
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/**
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* The nsLineBox class represents a horizontal line of frames. It contains
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* enough state to support incremental reflow of the frames, event handling
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* for the frames, and rendering of the frames.
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*/
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class nsLineBox {
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public:
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nsLineBox(nsIFrame* aFrame, PRInt32 aCount, PRBool aIsBlock);
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~nsLineBox();
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void Reset(nsIFrame* aFrame, PRInt32 aCount, PRBool aIsBlock);
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// mBlock bit
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PRBool IsBlock() const {
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return mFlags.mBlock;
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}
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PRBool IsInline() const {
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return 0 == mFlags.mBlock;
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}
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// mDirty bit
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void MarkDirty() {
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mFlags.mDirty = 1;
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}
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void ClearDirty() {
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mFlags.mDirty = 0;
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}
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PRBool IsDirty() const {
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return mFlags.mDirty;
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}
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// mImpactedByFloater bit
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void SetLineIsImpactedByFloater(PRBool aValue) {
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mFlags.mImpactedByFloater = aValue;
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}
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PRBool IsImpactedByFloater() const {
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return mFlags.mImpactedByFloater;
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}
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// mTrimmed bit
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void SetTrimmed(PRBool aOn) {
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mFlags.mTrimmed = aOn;
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}
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PRBool IsTrimmed() const {
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return mFlags.mTrimmed;
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}
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// mHasPercentageChild bit
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void SetHasPercentageChild(PRBool aOn) {
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mFlags.mHasPercentageChild = aOn;
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}
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PRBool HasPercentageChild() const {
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return mFlags.mHasPercentageChild;
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}
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// mLineWrapped bit
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void SetLineWrapped(PRBool aOn) {
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mFlags.mLineWrapped = aOn;
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}
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PRBool IsLineWrapped() const {
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return mFlags.mLineWrapped;
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}
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// mChildCount value
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PRInt32 GetChildCount() const {
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return (PRInt32) mFlags.mChildCount;
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}
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void SetChildCount(PRInt32 aNewCount) {
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if (NS_WARN_IF_FALSE(aNewCount >= 0, "negative child count")) {
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aNewCount = 0;
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}
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if (aNewCount > LINE_MAX_CHILD_COUNT) {
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aNewCount = LINE_MAX_CHILD_COUNT;
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}
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mFlags.mChildCount = aNewCount;
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}
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// mBreakType value
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PRBool HasBreak() const {
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return NS_STYLE_CLEAR_NONE != mFlags.mBreakType;
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}
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void SetBreakType(PRUint8 aBreakType) {
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NS_WARN_IF_FALSE(aBreakType <= LINE_MAX_BREAK_TYPE, "bad break type");
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mFlags.mBreakType = aBreakType;
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}
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PRUint8 GetBreakType() const {
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return mFlags.mBreakType;
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}
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// mCarriedOutBottomMargin value
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nscoord GetCarriedOutBottomMargin() const;
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void SetCarriedOutBottomMargin(nscoord aValue);
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// mFloaters
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PRBool HasFloaters() const {
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return (IsInline() && mInlineData) && mInlineData->mFloaters.NotEmpty();
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}
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nsFloaterCache* GetFirstFloater();
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void FreeFloaters(nsFloaterCacheFreeList& aFreeList);
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void AppendFloaters(nsFloaterCacheFreeList& aFreeList);
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PRBool RemoveFloater(nsIFrame* aFrame);
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void RemoveFloatersFromSpaceManager(nsISpaceManager* aSpaceManager);
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// Combined area
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void SetCombinedArea(const nsRect& aCombinedArea);
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void GetCombinedArea(nsRect* aResult);
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PRBool CombinedAreaIntersects(const nsRect& aDamageRect) {
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nsRect* ca = (mData ? &mData->mCombinedArea : &mBounds);
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return !((ca->YMost() <= aDamageRect.y) ||
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(ca->y >= aDamageRect.YMost()));
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}
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void SlideBy(nscoord aDY) {
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mBounds.y += aDY;
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if (mData) {
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mData->mCombinedArea.y += aDY;
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}
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}
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//----------------------------------------
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nscoord GetHeight() const {
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return mBounds.height;
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}
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static void DeleteLineList(nsIPresContext* aPresContext, nsLineBox* aLine);
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static nsLineBox* LastLine(nsLineBox* aLine);
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static nsLineBox* FindLineContaining(nsLineBox* aLine, nsIFrame* aFrame,
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PRInt32* aFrameIndexInLine);
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#ifdef DEBUG
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void List(nsIPresContext* aPresContext, FILE* out, PRInt32 aIndent) const;
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#endif
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nsIFrame* LastChild() const;
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PRBool IsLastChild(nsIFrame* aFrame) const;
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char* StateToString(char* aBuf, PRInt32 aBufSize) const;
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PRInt32 IndexOf(nsIFrame* aFrame) const;
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PRBool Contains(nsIFrame* aFrame) const {
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return IndexOf(aFrame) >= 0;
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}
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#ifdef DEBUG
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nsIAtom* SizeOf(nsISizeOfHandler* aHandler, PRUint32* aResult) const;
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static PRInt32 GetCtorCount();
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static PRInt32 ListLength(nsLineBox* aLine);
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#endif
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nsIFrame* mFirstChild;
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nsLineBox* mNext;
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nsRect mBounds;
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nscoord mMaxElementWidth; // width part of max-element-size
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nscoord mMaximumWidth; // maximum width (needed for incremental reflow of tables)
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struct FlagBits {
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PRUint32 mDirty : 1;
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PRUint32 mBlock : 1;
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PRUint32 mImpactedByFloater : 1;
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PRUint32 mTrimmed : 1;
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PRUint32 mHasPercentageChild : 1;
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PRUint32 mLineWrapped: 1;
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PRUint32 mBreakType : 4;
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PRUint32 mChildCount : 22;
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};
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struct ExtraData {
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ExtraData(const nsRect& aBounds) : mCombinedArea(aBounds) {
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}
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nsRect mCombinedArea;
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};
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struct ExtraBlockData : public ExtraData {
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ExtraBlockData(const nsRect& aBounds) : ExtraData(aBounds) {
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mCarriedOutBottomMargin = 0;
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}
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nscoord mCarriedOutBottomMargin;
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};
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struct ExtraInlineData : public ExtraData {
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ExtraInlineData(const nsRect& aBounds) : ExtraData(aBounds) {
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}
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nsFloaterCacheList mFloaters;
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};
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protected:
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union {
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PRUint32 mAllFlags;
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FlagBits mFlags;
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};
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union {
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ExtraData* mData;
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ExtraBlockData* mBlockData;
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ExtraInlineData* mInlineData;
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};
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void Cleanup();
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void MaybeFreeData();
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};
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//----------------------------------------------------------------------
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class nsLineIterator : public nsILineIterator {
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public:
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nsLineIterator();
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virtual ~nsLineIterator();
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NS_DECL_ISUPPORTS
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NS_IMETHOD GetNumLines(PRInt32* aResult);
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NS_IMETHOD GetDirection(PRBool* aIsRightToLeft);
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NS_IMETHOD GetLine(PRInt32 aLineNumber,
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nsIFrame** aFirstFrameOnLine,
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PRInt32* aNumFramesOnLine,
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nsRect& aLineBounds,
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PRUint32* aLineFlags);
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NS_IMETHOD FindLineContaining(nsIFrame* aFrame,
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PRInt32* aLineNumberResult);
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NS_IMETHOD FindLineAt(nscoord aY,
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PRInt32* aLineNumberResult);
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NS_IMETHOD FindFrameAt(PRInt32 aLineNumber,
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nscoord aX,
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nsIFrame** aFrameFound,
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PRBool* aXIsBeforeFirstFrame,
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PRBool* aXIsAfterLastFrame);
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nsresult Init(nsLineBox* aLines, PRBool aRightToLeft);
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protected:
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PRInt32 NumLines() const {
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return mNumLines;
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}
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nsLineBox* CurrentLine() {
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return mLines[mIndex];
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}
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nsLineBox* PrevLine() {
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if (0 == mIndex) {
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return nsnull;
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}
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return mLines[--mIndex];
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}
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nsLineBox* NextLine() {
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if (mIndex >= mNumLines - 1) {
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return nsnull;
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}
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return mLines[++mIndex];
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}
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nsLineBox* LineAt(PRInt32 aIndex) {
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if ((aIndex < 0) || (aIndex >= mNumLines)) {
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return nsnull;
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}
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return mLines[aIndex];
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}
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nsLineBox** mLines;
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PRInt32 mIndex;
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PRInt32 mNumLines;
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PRBool mRightToLeft;
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};
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#endif /* nsLineBox_h___ */
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