/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is mozilla.org code. * * The Initial Developer of the Original Code is * Netscape Communications Corporation. * Portions created by the Initial Developer are Copyright (C) 1998 * the Initial Developer. All Rights Reserved. * * Contributor(s): * * Alternatively, the contents of this file may be used under the terms of * either of the GNU General Public License Version 2 or later (the "GPL"), * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ #ifndef nsAbsoluteContainingBlock_h___ #define nsAbsoluteContainingBlock_h___ #include "nsFrameList.h" #include "nsHTMLReflowState.h" #include "nsLayoutAtoms.h" class nsIAtom; class nsIFrame; class nsPresContext; /** * This class contains the logic for being an absolute containing block. * * There is no principal child list, just a named child list which contains * the absolutely positioned frames * * All functions include as the first argument the frame that is delegating * the request * * @see nsLayoutAtoms::absoluteList */ class nsAbsoluteContainingBlock { public: nsAbsoluteContainingBlock() { } // useful for debugging virtual ~nsAbsoluteContainingBlock() { } // useful for debugging virtual nsIAtom* GetChildListName() const { return nsLayoutAtoms::absoluteList; } nsresult FirstChild(const nsIFrame* aDelegatingFrame, nsIAtom* aListName, nsIFrame** aFirstChild) const; nsresult SetInitialChildList(nsIFrame* aDelegatingFrame, nsPresContext* aPresContext, nsIAtom* aListName, nsIFrame* aChildList); nsresult AppendFrames(nsIFrame* aDelegatingFrame, nsPresContext* aPresContext, nsIPresShell& aPresShell, nsIAtom* aListName, nsIFrame* aFrameList); nsresult InsertFrames(nsIFrame* aDelegatingFrame, nsPresContext* aPresContext, nsIPresShell& aPresShell, nsIAtom* aListName, nsIFrame* aPrevFrame, nsIFrame* aFrameList); nsresult RemoveFrame(nsIFrame* aDelegatingFrame, nsPresContext* aPresContext, nsIPresShell& aPresShell, nsIAtom* aListName, nsIFrame* aOldFrame); nsresult ReplaceFrame(nsIFrame* aDelegatingFrame, nsPresContext* aPresContext, nsIPresShell& aPresShell, nsIAtom* aListName, nsIFrame* aOldFrame, nsIFrame* aNewFrame); // Called by the delegating frame after it has done its reflow first. This // function will reflow any absolutely positioned child frames that need to // be reflowed, e.g., because the absolutely positioned child frame has // 'auto' for an offset, or a percentage based width or height. // If aChildBounds is set, it returns (in the local coordinate space) the // bounding rect of the absolutely positioned child elements taking into // account their overflow area (if it is visible) nsresult Reflow(nsIFrame* aDelegatingFrame, nsPresContext* aPresContext, const nsHTMLReflowState& aReflowState, nscoord aContainingBlockWidth, nscoord aContainingBlockHeight, nsRect* aChildBounds = nsnull); // Called by the delegating frame to determine whether the // incremental reflow is entirely targeted at absolute children PRBool ReflowingAbsolutesOnly(nsIFrame* aDelegatingFrame, const nsHTMLReflowState& aReflowState); // Called only for a reflow reason of eReflowReason_Incremental. // Returns (in the local coordinate space) the bounding rect of the // absolutely positioned child elements taking into account their // overflow area (if it is visible). void IncrementalReflow(nsIFrame* aDelegatingFrame, nsPresContext* aPresContext, const nsHTMLReflowState& aReflowState, nscoord aContainingBlockWidth, nscoord aContainingBlockHeight); // Returns PR_TRUE if any absolute frames depend on the position of their // placeholders PRBool FramesDependOnContainer(PRBool aWidthChanged, PRBool aHeightChanged); void DestroyFrames(nsIFrame* aDelegatingFrame, nsPresContext* aPresContext); PRBool HasAbsoluteFrames() {return mAbsoluteFrames.NotEmpty();} void CalculateChildBounds(nsPresContext* aPresContext, nsRect& aChildBounds); protected: nsresult ReflowAbsoluteFrame(nsIFrame* aDelegatingFrame, nsPresContext* aPresContext, const nsHTMLReflowState& aReflowState, nscoord aContainingBlockWidth, nscoord aContainingBlockHeight, nsIFrame* aKidFrame, nsReflowReason aReason, nsReflowStatus& aStatus); protected: nsFrameList mAbsoluteFrames; // additional named child list #ifdef DEBUG // helper routine for debug printout void PrettyUC(nscoord aSize, char* aBuf); #endif }; #endif /* nsnsAbsoluteContainingBlock_h___ */