gecko-dev/layout/generic/nsViewportFrame.h

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/* -*- 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
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*
* 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
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#ifndef nsViewportFrame_h___
#define nsViewportFrame_h___
#include "nsContainerFrame.h"
#include "nsLayoutAtoms.h"
#include "nsPresContext.h"
#include "nsReflowPath.h"
#include "nsIPresShell.h"
#include "nsAbsoluteContainingBlock.h"
class nsFixedContainingBlock : public nsAbsoluteContainingBlock {
public:
nsFixedContainingBlock() { } // useful for debugging
virtual ~nsFixedContainingBlock() { } // useful for debugging
virtual nsIAtom* GetChildListName() const { return nsLayoutAtoms::fixedList; }
};
/**
* ViewportFrame is the parent of a single child - the doc root frame or a scroll frame
* containing the doc root frame. ViewportFrame stores this child in its primary child
* list. It stores fixed positioned items in a secondary child list and its mFixedContainer
* delegate handles them.
*/
class ViewportFrame : public nsContainerFrame {
public:
ViewportFrame() { } // useful for debugging
virtual ~ViewportFrame() { } // useful for debugging
NS_IMETHOD Destroy(nsPresContext* aPresContext);
NS_IMETHOD SetInitialChildList(nsPresContext* aPresContext,
nsIAtom* aListName,
nsIFrame* aChildList);
NS_IMETHOD GetFrameForPoint(nsPresContext* aPresContext,
const nsPoint& aPoint,
nsFramePaintLayer aWhichLayer,
nsIFrame** aFrame);
NS_IMETHOD AppendFrames(nsPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aFrameList);
NS_IMETHOD InsertFrames(nsPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsIFrame* aFrameList);
NS_IMETHOD RemoveFrame(nsPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aOldFrame);
virtual nsIAtom* GetAdditionalChildListName(PRInt32 aIndex) const;
virtual nsIFrame* GetFirstChild(nsIAtom* aListName) const;
NS_IMETHOD Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus);
virtual PRBool CanPaintBackground() { return PR_FALSE; }
/**
* Get the "type" of the frame
*
* @see nsLayoutAtoms::viewportFrame
*/
virtual nsIAtom* GetType() const;
virtual PRBool IsContainingBlock() const;
#ifdef DEBUG
NS_IMETHOD GetFrameName(nsAString& aResult) const;
#endif
protected:
nsPoint AdjustReflowStateForScrollbars(nsHTMLReflowState* aReflowState) const;
protected:
nsFixedContainingBlock mFixedContainer;
};
#endif // nsViewportFrame_h___