gecko-dev/layout/generic/nsLeafFrame.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
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*
* 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/
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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.
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*
* 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 ***** */
/* base class for rendering objects that do not have child lists */
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#ifndef nsLeafFrame_h___
#define nsLeafFrame_h___
#include "nsFrame.h"
#include "nsDisplayList.h"
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/**
* 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 BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists) {
DO_GLOBAL_REFLOW_COUNT_DSP("nsLeafFrame");
return DisplayBorderBackgroundOutline(aBuilder, aLists);
}
/**
* Both GetMinWidth and GetPrefWidth will return whatever GetIntrinsicWidth
* returns.
*/
virtual nscoord GetMinWidth(nsIRenderingContext *aRenderingContext);
virtual nscoord GetPrefWidth(nsIRenderingContext *aRenderingContext);
/**
* Reflow our frame. This will use the computed width plus borderpadding for
* the desired width, and use the return value of GetIntrinsicHeight plus
* borderpadding for the desired height. Ascent will be set to the height,
* and descent will be set to 0.
*/
NS_IMETHOD Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus);
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virtual PRBool IsFrameOfType(PRUint32 aFlags) const
{
// We don't actually contain a block, but we do always want a
// computed width, so tell a little white lie here.
return nsFrame::IsFrameOfType(aFlags & ~(nsIFrame::eReplacedContainsBlock));
}
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protected:
nsLeafFrame(nsStyleContext* aContext) : nsFrame(aContext) {}
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virtual ~nsLeafFrame();
/**
* Return the intrinsic width of the frame's content area. Note that this
* should not include borders or padding and should not depend on the applied
* styles.
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*/
virtual nscoord GetIntrinsicWidth() = 0;
/**
* Return the intrinsic height of the frame's content area. This should not
* include border or padding. This will only be called if there is no
* computed height. Note that subclasses must either implement this or
* override Reflow; the default Reflow impl calls this method.
*/
virtual nscoord GetIntrinsicHeight();
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/**
* Subroutine to add in borders and padding
*/
void AddBordersAndPadding(const nsHTMLReflowState& aReflowState,
nsHTMLReflowMetrics& aDesiredSize);
/**
* Set aDesiredSize to be the available size
*/
void SizeToAvailSize(const nsHTMLReflowState& aReflowState,
nsHTMLReflowMetrics& aDesiredSize);
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};
#endif /* nsLeafFrame_h___ */