gecko-dev/layout/generic/nsSpaceManager.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#ifndef nsSpaceManager_h___
#define nsSpaceManager_h___
#include "nsISpaceManager.h"
#include "prclist.h"
#include "plhash.h"
/**
* Implementation of nsISpaceManager that maintains a region data structure of
* unavailable space
*/
class nsSpaceManager : public nsISpaceManager {
public:
nsSpaceManager(nsIFrame* aFrame);
// nsISupports
NS_DECL_ISUPPORTS
// nsISpaceManager
NS_IMETHOD GetFrame(nsIFrame*& aFrame) const;
NS_IMETHOD Translate(nscoord aDx, nscoord aDy);
NS_IMETHOD GetTranslation(nscoord& aX, nscoord& aY) const;
NS_IMETHOD YMost(nscoord& aYMost) const;
NS_IMETHOD GetBandData(nscoord aYOffset,
const nsSize& aMaxSize,
nsBandData& aBandData) const;
NS_IMETHOD AddRectRegion(nsIFrame* aFrame,
const nsRect& aUnavailableSpace);
NS_IMETHOD ResizeRectRegion(nsIFrame* aFrame,
nscoord aDeltaWidth,
nscoord aDeltaHeight,
AffectedEdge aEdge);
NS_IMETHOD OffsetRegion(nsIFrame* aFrame, nscoord aDx, nscoord aDy);
NS_IMETHOD RemoveRegion(nsIFrame* aFrame);
NS_IMETHOD ClearRegions();
protected:
// Structure that maintains information about the region associated
// with a particular frame
struct FrameInfo {
nsIFrame* const mFrame;
nsRect mRect; // rectangular region
FrameInfo(nsIFrame* aFrame, const nsRect& aRect);
};
public:
// Doubly linked list of band rects
struct BandRect : PRCListStr {
nscoord mLeft, mTop;
nscoord mRight, mBottom;
PRIntn mNumFrames; // number of frames occupying this rect
union {
nsIFrame* mFrame; // single frame occupying the space
nsVoidArray* mFrames; // list of frames occupying the space
};
BandRect(nscoord aLeft, nscoord aTop,
nscoord aRight, nscoord aBottom,
nsIFrame*);
BandRect(nscoord aLeft, nscoord aTop,
nscoord aRight, nscoord aBottom,
nsVoidArray*);
~BandRect();
// List operations
BandRect* Next() const {return (BandRect*)PR_NEXT_LINK(this);}
BandRect* Prev() const {return (BandRect*)PR_PREV_LINK(this);}
void InsertBefore(BandRect* aBandRect) {PR_INSERT_BEFORE(aBandRect, this);}
void InsertAfter(BandRect* aBandRect) {PR_INSERT_AFTER(aBandRect, this);}
void Remove() {PR_REMOVE_LINK(this);}
// Split the band rect into two vertically, with this band rect becoming
// the top part, and a new band rect being allocated and returned for the
// bottom part
//
// Does not insert the new band rect into the linked list
BandRect* SplitVertically(nscoord aBottom);
// Split the band rect into two horizontally, with this band rect becoming
// the left part, and a new band rect being allocated and returned for the
// right part
//
// Does not insert the new band rect into the linked list
BandRect* SplitHorizontally(nscoord aRight);
// Accessor functions
PRBool IsOccupiedBy(const nsIFrame*) const;
void AddFrame(const nsIFrame*);
void RemoveFrame(const nsIFrame*);
PRBool HasSameFrameList(const BandRect* aBandRect) const;
PRInt32 Length() const;
};
// Circular linked list of band rects
struct BandList : BandRect {
BandList();
// Accessors
PRBool IsEmpty() const {return PR_CLIST_IS_EMPTY((PRCListStr*)this);}
BandRect* Head() const {return (BandRect*)PR_LIST_HEAD(this);}
BandRect* Tail() const {return (BandRect*)PR_LIST_TAIL(this);}
// Operations
void Append(BandRect* aBandRect) {PR_APPEND_LINK(aBandRect, this);}
// Remove and delete all the band rects in the list
void Clear();
};
protected:
nsIFrame* const mFrame; // frame associated with the space manager
nscoord mX, mY; // translation from local to global coordinate space
BandList mBandList; // header/sentinel for circular linked list of band rects
PLHashTable* mFrameInfoMap;
protected:
virtual ~nsSpaceManager();
FrameInfo* GetFrameInfoFor(nsIFrame* aFrame);
FrameInfo* CreateFrameInfo(nsIFrame* aFrame, const nsRect& aRect);
void DestroyFrameInfo(FrameInfo*);
void ClearFrameInfo();
void ClearBandRects();
BandRect* GetNextBand(const BandRect* aBandRect) const;
void DivideBand(BandRect* aBand, nscoord aBottom);
PRBool CanJoinBands(BandRect* aBand, BandRect* aPrevBand);
PRBool JoinBands(BandRect* aBand, BandRect* aPrevBand);
void AddRectToBand(BandRect* aBand, BandRect* aBandRect);
void InsertBandRect(BandRect* aBandRect);
nsresult GetBandAvailableSpace(const BandRect* aBand,
nscoord aY,
const nsSize& aMaxSize,
nsBandData& aAvailableSpace) const;
private:
nsSpaceManager(const nsSpaceManager&); // no implementation
void operator=(const nsSpaceManager&); // no implementation
friend PR_CALLBACK PRIntn NS_RemoveFrameInfoEntries(PLHashEntry*, PRIntn, void*);
};
/* prototypes */
PR_CALLBACK PLHashNumber
NS_HashNumber(const void* key);
#endif /* nsSpaceManager_h___ */