зеркало из https://github.com/mozilla/gecko-dev.git
139 строки
5.3 KiB
C++
139 строки
5.3 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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/* base class for rendering objects that do not have child lists */
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#ifndef nsLeafFrame_h___
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#define nsLeafFrame_h___
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#include "nsFrame.h"
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#include "nsDisplayList.h"
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/**
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* Abstract class that provides simple fixed-size layout for leaf objects
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* (e.g. images, form elements, etc.). Deriviations provide the implementation
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* of the GetDesiredSize method. The rendering method knows how to render
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* borders and backgrounds.
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*/
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class nsLeafFrame : public nsFrame {
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public:
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NS_DECL_FRAMEARENA_HELPERS
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// nsIFrame replacements
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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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DO_GLOBAL_REFLOW_COUNT_DSP("nsLeafFrame");
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return DisplayBorderBackgroundOutline(aBuilder, aLists);
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}
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/**
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* Both GetMinWidth and GetPrefWidth will return whatever GetIntrinsicWidth
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* returns.
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*/
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virtual nscoord GetMinWidth(nsRenderingContext *aRenderingContext);
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virtual nscoord GetPrefWidth(nsRenderingContext *aRenderingContext);
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/**
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* Our auto size is just intrinsic width and intrinsic height.
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*/
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virtual nsSize ComputeAutoSize(nsRenderingContext *aRenderingContext,
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nsSize aCBSize, nscoord aAvailableWidth,
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nsSize aMargin, nsSize aBorder,
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nsSize aPadding, bool aShrinkWrap);
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/**
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* Reflow our frame. This will use the computed width plus borderpadding for
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* the desired width, and use the return value of GetIntrinsicHeight plus
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* borderpadding for the desired height. Ascent will be set to the height,
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* and descent will be set to 0.
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*/
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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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* This method does most of the work that Reflow() above need done.
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*/
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NS_IMETHOD DoReflow(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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virtual bool IsFrameOfType(PRUint32 aFlags) const
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{
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// We don't actually contain a block, but we do always want a
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// computed width, so tell a little white lie here.
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return nsFrame::IsFrameOfType(aFlags & ~(nsIFrame::eReplacedContainsBlock));
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}
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protected:
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nsLeafFrame(nsStyleContext* aContext) : nsFrame(aContext) {}
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virtual ~nsLeafFrame();
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/**
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* Return the intrinsic width of the frame's content area. Note that this
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* should not include borders or padding and should not depend on the applied
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* styles.
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*/
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virtual nscoord GetIntrinsicWidth() = 0;
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/**
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* Return the intrinsic height of the frame's content area. This should not
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* include border or padding. This will only matter if the specified height
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* is auto. Note that subclasses must either implement this or override
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* Reflow and ComputeAutoSize; the default Reflow and ComputeAutoSize impls
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* call this method.
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*/
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virtual nscoord GetIntrinsicHeight();
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/**
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* Subroutine to add in borders and padding
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*/
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void AddBordersAndPadding(const nsHTMLReflowState& aReflowState,
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nsHTMLReflowMetrics& aDesiredSize);
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/**
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* Set aDesiredSize to be the available size
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*/
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void SizeToAvailSize(const nsHTMLReflowState& aReflowState,
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nsHTMLReflowMetrics& aDesiredSize);
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};
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#endif /* nsLeafFrame_h___ */
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