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153 lines
5.1 KiB
C++
153 lines
5.1 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: NPL 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 Netscape Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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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 the GNU General Public License Version 2 or later (the "GPL"), or
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* 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 NPL, 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 NPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsHTMLReflowCommand_h___
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#define nsHTMLReflowCommand_h___
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#include "nsReflowType.h"
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#include "nsVoidArray.h"
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#include <stdio.h>
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class nsIAtom;
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class nsIFrame;
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class nsIPresContext;
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class nsIRenderingContext;
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struct nsHTMLReflowMetrics;
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struct nsSize;
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// Reflow command flags
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#define NS_RC_CREATED_DURING_DOCUMENT_LOAD 0x0001
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/**
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* A reflow command is an object that is generated in response to a content
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* model change notification. The reflow command is given to a presentation
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* shell where it is queued and then dispatched by invoking the reflow
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* commands's Dispatch() member function.
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*
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* Reflow command processing follows a path from the root frame down to the
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* target frame (the frame for which the reflow command is destined). Reflow
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* commands are processed by invoking the frame's Reflow() member function.
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*
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* The typical flow of control for a given reflow command starts with a content
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* change notification. The content notifications are sent to document observers.
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* The presentation shell forwards the notifications to the style set. The style
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* system responds to the notifications by creating new frame (or destroying
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* existing frames) as appropriate, and then generating a reflow command.
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*
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* @see nsIDocumentObserver
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* @see nsIStyleSet
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* @see nsIFrameReflow#Reflow()
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* @see nsIPresShell#AppendReflowCommand()
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* @see nsIPresShell#ProcessReflowCommands()
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*/
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class nsHTMLReflowCommand {
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public:
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/**
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* Construct an HTML reflow command of type aReflowType and with target
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* frame aTargetFrame. You can also specify an optional child frame, e.g.
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* to indicate the inserted child frame
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*/
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nsHTMLReflowCommand(nsIFrame* aTargetFrame,
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nsReflowType aReflowType,
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nsIFrame* aChildFrame = nsnull,
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nsIAtom* aAttribute = nsnull);
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~nsHTMLReflowCommand();
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/**
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* Get the target of the reflow command.
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*/
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nsresult GetTarget(nsIFrame*& aTargetFrame) const;
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/**
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* Change the target of the reflow command.
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*/
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nsresult SetTarget(nsIFrame* aTargetFrame);
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/**
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* Get the type of reflow command.
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*/
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nsresult GetType(nsReflowType& aReflowType) const;
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/**
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* Can return nsnull. If nsnull is not returned, the caller must NS_RELEASE aAttribute
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*/
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nsresult GetAttribute(nsIAtom *& aAttribute) const;
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/**
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* Get the child frame associated with the reflow command.
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*/
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nsresult GetChildFrame(nsIFrame*& aChildFrame) const;
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/**
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* Returns the name of the child list to which the child frame belongs.
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* Only used for reflow command types FrameAppended, FrameInserted, and
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* FrameRemoved
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*
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* Returns nsnull if the child frame is associated with the unnamed
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* principal child list
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*/
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nsresult GetChildListName(nsIAtom*& aListName) const;
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/**
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* Sets the name of the child list to which the child frame belongs.
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* Only used for reflow command types FrameAppended, FrameInserted, and
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* FrameRemoved
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*/
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nsresult SetChildListName(nsIAtom* aListName);
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/**
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* Dump out the reflow-command to out
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*/
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nsresult List(FILE* out) const;
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/**
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* Get/set reflow command flags
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*/
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nsresult GetFlags(PRInt32* aFlags);
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nsresult SetFlags(PRInt32 aFlags);
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private:
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nsReflowType mType;
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nsIFrame* mTargetFrame;
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nsIFrame* mChildFrame;
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nsIAtom* mAttribute;
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nsIAtom* mListName;
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PRInt32 mFlags;
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};
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#endif /* nsHTMLReflowCommand_h___ */
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