gecko-dev/layout/generic/nsLeafFrame.h

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1998-04-13 20:24:54 +00:00
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#ifndef nsLeafFrame_h___
#define nsLeafFrame_h___
#include "nsFrame.h"
/**
* Abstract class that provides simple fixed-size layout for leaf objects
* (e.g. images, form elements, etc.). Deriviations provide the implementation
* of the GetDesiredSize method. The rendering method knows how to render
* borders and backgrounds.
*/
class nsLeafFrame : public nsFrame {
public:
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// nsIFrame replacements
NS_IMETHOD Paint(nsIPresContext& aPresContext,
nsIRenderingContext& aRenderingContext,
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const nsRect& aDirtyRect,
nsFramePaintLayer aWhichLayer);
NS_IMETHOD Reflow(nsIPresContext& aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus);
NS_IMETHOD ContentChanged(nsIPresContext* aPresContext,
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nsIContent* aChild,
nsISupports* aSubContent);
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protected:
virtual ~nsLeafFrame();
/**
* Return the desired size of the frame's content area. Note that this
* method doesn't need to deal with padding or borders (the caller will
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* deal with it). In addition, the ascent will be set to the height
* and the descent will be set to zero.
*/
virtual void GetDesiredSize(nsIPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
nsHTMLReflowMetrics& aDesiredSize) = 0;
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/**
* Subroutine to add in borders and padding
*/
void AddBordersAndPadding(nsIPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
nsHTMLReflowMetrics& aDesiredSize,
nsMargin& aBorderPadding);
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};
#endif /* nsLeafFrame_h___ */