зеркало из https://github.com/mozilla/pjs.git
132 строки
4.7 KiB
C++
132 строки
4.7 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.org 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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/*
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* rendering object that is the root of the frame tree, which contains
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* the document's scrollbars and contains fixed-positioned elements
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*/
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#ifndef nsViewportFrame_h___
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#define nsViewportFrame_h___
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#include "nsContainerFrame.h"
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#include "nsGkAtoms.h"
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#include "nsAbsoluteContainingBlock.h"
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class nsPresContext;
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/**
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* ViewportFrame is the parent of a single child - the doc root frame or a scroll frame
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* containing the doc root frame. ViewportFrame stores this child in its primary child
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* list. It stores fixed positioned items in a secondary child list and its mFixedContainer
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* delegate handles them.
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*/
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class ViewportFrame : public nsContainerFrame {
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public:
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NS_DECL_FRAMEARENA_HELPERS
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typedef nsContainerFrame Super;
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ViewportFrame(nsStyleContext* aContext)
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: nsContainerFrame(aContext)
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, mFixedContainer(nsGkAtoms::fixedList)
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{}
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virtual ~ViewportFrame() { } // useful for debugging
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virtual void DestroyFrom(nsIFrame* aDestructRoot);
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NS_IMETHOD Init(nsIContent* aContent,
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nsIFrame* aParent,
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nsIFrame* asPrevInFlow);
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NS_IMETHOD SetInitialChildList(nsIAtom* aListName,
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nsFrameList& aChildList);
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NS_IMETHOD AppendFrames(nsIAtom* aListName,
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nsFrameList& aFrameList);
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NS_IMETHOD InsertFrames(nsIAtom* aListName,
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nsIFrame* aPrevFrame,
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nsFrameList& aFrameList);
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NS_IMETHOD RemoveFrame(nsIAtom* aListName,
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nsIFrame* aOldFrame);
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virtual nsIAtom* GetAdditionalChildListName(PRInt32 aIndex) const;
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virtual nsFrameList GetChildList(nsIAtom* aListName) const;
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NS_IMETHOD BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsRect& aDirtyRect,
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const nsDisplayListSet& aLists);
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virtual nscoord GetMinWidth(nsIRenderingContext *aRenderingContext);
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virtual nscoord GetPrefWidth(nsIRenderingContext *aRenderingContext);
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NS_IMETHOD Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus);
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/**
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* Get the "type" of the frame
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*
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* @see nsGkAtoms::viewportFrame
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*/
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virtual nsIAtom* GetType() const;
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virtual PRBool IsContainingBlock() const;
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virtual void InvalidateInternal(const nsRect& aDamageRect,
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nscoord aX, nscoord aY, nsIFrame* aForChild,
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PRUint32 aFlags);
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#ifdef DEBUG
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NS_IMETHOD GetFrameName(nsAString& aResult) const;
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#endif
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protected:
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nsPoint AdjustReflowStateForScrollbars(nsHTMLReflowState* aReflowState) const;
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protected:
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// position: fixed content is really content which is absolutely positioned with
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// respect to the viewport.
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nsAbsoluteContainingBlock mFixedContainer;
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};
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#endif // nsViewportFrame_h___
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