104 lines
3.6 KiB
C++
104 lines
3.6 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 License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#ifndef nsSpaceManager_h___
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#define nsSpaceManager_h___
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#include "nsISpaceManager.h"
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/**
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* Implementation of nsISpaceManager that maintains a region data structure of
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* unavailable space
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*/
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class SpaceManager : public nsISpaceManager {
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public:
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SpaceManager(nsIFrame* aFrame);
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// nsISupports
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NS_DECL_ISUPPORTS
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virtual nsIFrame* GetFrame() const;
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virtual void Translate(nscoord aDx, nscoord aDy);
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virtual void GetTranslation(nscoord& aX, nscoord& aY) const;
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virtual nscoord YMost() const;
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virtual PRInt32 GetBandData(nscoord aYOffset,
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const nsSize& aMaxSize,
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nsBandData& aBandData) const;
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virtual PRBool AddRectRegion(nsIFrame* aFrame, const nsRect& aUnavailableSpace);
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virtual PRBool ReshapeRectRegion(nsIFrame* aFrame, const nsRect& aUnavailableSpace);
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virtual PRBool OffsetRegion(nsIFrame* aFrame, nscoord dx, nscoord dy);
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virtual PRBool RemoveRegion(nsIFrame* aFrame);
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virtual void ClearRegions();
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protected:
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struct nsBandRect : nsRect {
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nsIFrame* frame;
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};
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class RectArray {
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public:
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RectArray();
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~RectArray();
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// Functions to add rects
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void Append(const nsRect& aRect, nsIFrame* aFrame);
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void InsertAt(const nsRect& aRect, PRInt32 aIndex, nsIFrame* aFrame);
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void RemoveAt(PRInt32 aIndex);
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// Clear the list of rectangles
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void Clear();
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// Returns the y-most of the bottom band
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nscoord YMost() const;
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public:
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// Access to the underlying storage
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nsBandRect* mRects; // y-x banded array of rectangles of unavailable space
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PRInt32 mCount; // current number of rects
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PRInt32 mMax; // capacity of rect array
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};
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nsIFrame* const mFrame; // frame associated with the space manager
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nscoord mX, mY; // translation from local to global coordinate space
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RectArray mRectArray; // y-x banded array of rectangles of unavailable space
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RectArray mEmptyRects; // list of empty height rects
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protected:
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PRBool GetNextBand(nsBandRect*& aRect, PRInt32& aIndex) const;
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PRInt32 LengthOfBand(const nsBandRect* aBand, PRInt32 aIndex) const;
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PRBool CoalesceBand(nsBandRect* aBand, PRInt32 aIndex);
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void DivideBand(nsBandRect* aBand, PRInt32 aIndex, nscoord aB1Height);
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void AddRectToBand(nsBandRect* aBand, PRInt32 aIndex,
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const nsRect& aRect, nsIFrame* aFrame);
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PRInt32 GetBandAvailableSpace(const nsBandRect* aBand,
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PRInt32 aIndex,
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nscoord aY,
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const nsSize& aMaxSize,
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nsBandData& aAvailableSpace) const;
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private:
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SpaceManager(const SpaceManager&); // no implementation
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void operator=(const SpaceManager&); // no implementation
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};
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#endif /* nsSpaceManager_h___ */
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