зеркало из https://github.com/mozilla/gecko-dev.git
89 строки
3.0 KiB
C++
89 строки
3.0 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 "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS IS"
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* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
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* the License for the specific language governing rights and limitations
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* 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 Copyright (C) 1998
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* Netscape Communications Corporation. All Rights Reserved.
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*/
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#ifndef nsBlockBandData_h___
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#define nsBlockBandData_h___
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#include "nsISpaceManager.h"
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/**
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* Class used to manage processing of the space-manager band data.
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* Provides HTML/CSS specific behavior to the raw data.
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*/
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class nsBlockBandData : public nsBandData {
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public:
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nsBlockBandData();
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~nsBlockBandData();
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// Initialize. This must be called before any of the other methods.
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nsresult Init(nsISpaceManager* aSpaceManager, const nsSize& aSpace);
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// Get some available space. Note that aY is relative to the current
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// space manager translation.
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nsresult GetAvailableSpace(nscoord aY, nsRect& aResult);
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// Clear any current floaters, returning a new Y coordinate
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nscoord ClearFloaters(nscoord aY, PRUint8 aBreakType);
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// Get the raw trapezoid count for this band.
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PRInt32 GetTrapezoidCount() const {
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return mCount;
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}
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const nsBandTrapezoid* GetTrapezoid(PRInt32 aIndex) const {
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return &mTrapezoids[aIndex];
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}
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// Get the number of floaters that are impacting the current
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// band. Note that this value is relative to the current translation
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// in the space manager which means that some floaters may be hidden
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// by the translation and therefore won't be in the count.
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PRInt32 GetFloaterCount() const {
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return mFloaters;
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}
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// Return the impact on the max-element-size for this band by
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// computing the maximum width and maximum height of all the
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// floaters.
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void GetMaxElementSize(nscoord* aWidthResult, nscoord* aHeightResult) const;
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protected:
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// The spacemanager we are getting space from
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nsISpaceManager* mSpaceManager;
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nscoord mSpaceManagerX, mSpaceManagerY;
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// Limit to the available space (set by Init)
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nsSize mSpace;
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// Trapezoids used during band processing
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nsBandTrapezoid mData[12];
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// Bounding rect of available space between any left and right floaters
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nsRect mAvailSpace;
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// Number of floaters in the current band. Note that this number may
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// be less than the total number of floaters present in the band, if
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// our translation in the space manager "hides" some floaters.
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PRInt32 mFloaters;
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void ComputeAvailSpaceRect();
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PRBool ShouldClearFrame(nsIFrame* aFrame, PRUint8 aBreakType);
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};
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#endif /* nsBlockBandData_h___ */
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