/* -*- 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 ***** */ /* * code for managing absolutely positioned children of a rendering * object that is a containing block for them */ #ifndef nsAbsoluteContainingBlock_h___ #define nsAbsoluteContainingBlock_h___ #include "nsFrameList.h" #include "nsHTMLReflowState.h" #include "nsGkAtoms.h" #include "nsContainerFrame.h" class nsIAtom; class nsIFrame; class nsPresContext; /** * This class contains the logic for being an absolute containing block. This * class is used within viewport frames (for frames representing content with * fixed position) and blocks (for frames representing absolutely positioned * content), since each set of frames is absolutely positioned with respect to * its parent. * * 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 nsGkAtoms::absoluteList and nsGkAtoms::fixedList */ class nsAbsoluteContainingBlock { public: nsAbsoluteContainingBlock(nsIAtom* aChildListName) #ifdef DEBUG : mChildListName(aChildListName) #endif { NS_ASSERTION(mChildListName == nsGkAtoms::absoluteList || mChildListName == nsGkAtoms::fixedList, "should either represent position:fixed or absolute content"); } #ifdef DEBUG nsIAtom* GetChildListName() const { return mChildListName; } #endif const nsFrameList& GetChildList() const { return mAbsoluteFrames; } nsresult SetInitialChildList(nsIFrame* aDelegatingFrame, nsIAtom* aListName, nsFrameList& aChildList); nsresult AppendFrames(nsIFrame* aDelegatingFrame, nsIAtom* aListName, nsFrameList& aFrameList); nsresult InsertFrames(nsIFrame* aDelegatingFrame, nsIAtom* aListName, nsIFrame* aPrevFrame, nsFrameList& aFrameList); void RemoveFrame(nsIFrame* aDelegatingFrame, nsIAtom* aListName, nsIFrame* aOldFrame); // 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). // @param aForceReflow if this is false, reflow for some absolutely // positioned frames may be skipped based on whether they use // placeholders for positioning and on whether the containing block // width or height changed. nsresult Reflow(nsContainerFrame* aDelegatingFrame, nsPresContext* aPresContext, const nsHTMLReflowState& aReflowState, nsReflowStatus& aReflowStatus, nscoord aContainingBlockWidth, nscoord aContainingBlockHeight, PRBool aConstrainHeight, PRBool aCBWidthChanged, PRBool aCBHeightChanged, nsRect* aChildBounds = nsnull); void DestroyFrames(nsIFrame* aDelegatingFrame, nsIFrame* aDestructRoot); PRBool HasAbsoluteFrames() {return mAbsoluteFrames.NotEmpty();} // Mark our size-dependent absolute frames with NS_FRAME_HAS_DIRTY_CHILDREN // so that we'll make sure to reflow them. void MarkSizeDependentFramesDirty(); // Mark all our absolute frames with NS_FRAME_IS_DIRTY void MarkAllFramesDirty(); protected: // Returns PR_TRUE if the position of f depends on the position of // its placeholder or if the position or size of f depends on a // containing block dimension that changed. PRBool FrameDependsOnContainer(nsIFrame* f, PRBool aCBWidthChanged, PRBool aCBHeightChanged); nsresult ReflowAbsoluteFrame(nsIFrame* aDelegatingFrame, nsPresContext* aPresContext, const nsHTMLReflowState& aReflowState, nscoord aContainingBlockWidth, nscoord aContainingBlockHeight, PRBool aConstrainHeight, nsIFrame* aKidFrame, nsReflowStatus& aStatus, nsRect* aChildBounds); // Mark our absolute frames dirty. If aMarkAllDirty is true, all will be // marked with NS_FRAME_IS_DIRTY. Otherwise, the size-dependant ones will be // marked with NS_FRAME_HAS_DIRTY_CHILDREN. void DoMarkFramesDirty(PRBool aMarkAllDirty); protected: nsFrameList mAbsoluteFrames; // additional named child list #ifdef DEBUG nsIAtom* const mChildListName; // nsGkAtoms::fixedList or nsGkAtoms::absoluteList // helper routine for debug printout void PrettyUC(nscoord aSize, char* aBuf); #endif }; #endif /* nsnsAbsoluteContainingBlock_h___ */