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127 lines
4.3 KiB
C++
127 lines
4.3 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 Communicator client 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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*
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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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/* code for management of floats that implements space manager interfaces */
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#ifndef nsBlockBandData_h___
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#define nsBlockBandData_h___
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#include "nsSpaceManager.h"
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class nsPresContext;
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// Number of builtin nsBandTrapezoid's
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#define NS_BLOCK_BAND_DATA_TRAPS 6
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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(nsSpaceManager* 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, PRBool aRelaxHeightConstraint,
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nsRect& aResult);
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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 floats 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 floats may be hidden
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// by the translation and therefore won't be in the count.
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PRInt32 GetFloatCount() const {
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return mLeftFloats + mRightFloats;
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}
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PRInt32 GetLeftFloatCount() const {
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return mLeftFloats;
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}
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PRInt32 GetRightFloatCount() const {
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return mRightFloats;
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}
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#ifdef DEBUG
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void List();
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#endif
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protected:
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/** utility method to calculate the band data at aY.
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* nsBlockBandData methods should never call
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* mSpaceManager->GetBandData directly.
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* They should always call this method instead so data members
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* mTrapezoid, mCount, and mSize all get managed properly.
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*/
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nsresult GetBandData(nscoord aY, PRBool aRelaxHeightConstraint);
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// The spacemanager we are getting space from
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nsSpaceManager* 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[NS_BLOCK_BAND_DATA_TRAPS];
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// Bounding rect of available space between any left and right floats
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nsRect mAvailSpace;
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// Number of left/right floats in the current band. Note that this
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// number may be less than the total number of floats present in
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// the band, if our translation in the space manager "hides" some
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// floats.
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PRInt32 mLeftFloats, mRightFloats;
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void ComputeAvailSpaceRect();
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};
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#endif /* nsBlockBandData_h___ */
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