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117 lines
3.7 KiB
C++
117 lines
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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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 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#ifndef nsIContent_h___
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#define nsIContent_h___
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#include <stdio.h>
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#include "nslayout.h"
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#include "nsISupports.h"
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class nsIAtom;
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class nsIContentDelegate;
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class nsIDocument;
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class nsIPresContext;
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class nsISizeofHandler;
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class nsString;
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class nsString;
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class nsVoidArray;
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// IID for the nsIContent interface
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#define NS_ICONTENT_IID \
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{ 0x78030220, 0x9447, 0x11d1, \
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{0x93, 0x23, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32} }
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/**
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* Content attribute states
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*/
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enum nsContentAttr {
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// Attribute does not exist on the piece of content
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eContentAttr_NotThere,
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// Attribute exists, but has no value, e.g. "BORDER" in <TABLE BORDER>
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eContentAttr_NoValue,
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// Attribute exists and has a value. However, value may be the
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// empty string. e.g. <TABLE BORDER="1"> or <TABLE BORDER="">
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eContentAttr_HasValue,
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};
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// A node of content in a documents content model. This interface
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// is supported by all content objects.
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class nsIContent : public nsISupports
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{
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public:
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virtual nsIDocument* GetDocument() const = 0;
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virtual void SetDocument(nsIDocument* aDocument) = 0;
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virtual nsIContent* GetParent() const = 0;
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virtual void SetParent(nsIContent* aParent) = 0;
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virtual PRBool CanContainChildren() const = 0;
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virtual PRInt32 ChildCount() const = 0;
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virtual nsIContent* ChildAt(PRInt32 aIndex) const = 0;
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virtual PRInt32 IndexOf(nsIContent* aPossibleChild) const = 0;
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virtual PRBool InsertChildAt(nsIContent* aKid, PRInt32 aIndex) = 0;
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virtual PRBool ReplaceChildAt(nsIContent* aKid, PRInt32 aIndex) = 0;
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virtual PRBool AppendChild(nsIContent* aKid) = 0;
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virtual PRBool RemoveChildAt(PRInt32 aIndex) = 0;
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virtual nsIAtom* GetTag() const = 0;
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/**
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* Set attribute values. All attribute values are assumed to have a
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* canonical String representation that can be used for these
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* methods. The setAttribute method is assumed to perform a translation
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* of the canonical form into the underlying content specific
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* form.
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*
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* aValue may legitimately be the empty string.
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*/
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virtual void SetAttribute(const nsString& aName, const nsString& aValue) = 0;
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/**
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* Get the current value of the attribute. This returns a form that is
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* suitable for passing back into setAttribute.
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*
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* <UL>
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*
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* <LI>If the attribute is not set and has no default value, return
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* eContentAttr_NotThere.
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*
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* <LI>If the attribute exists, but has no value, return
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* eContentAttr_NoValue.
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*
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* <LI>If the attribute has a value, empty or otherwise, set ret to
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* be the value, and return eContentAttr_HasValue.
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*
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* </UL> */
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virtual nsContentAttr GetAttribute(const nsString& aName,
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nsString& aResult) const = 0;
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virtual nsIContentDelegate* GetDelegate(nsIPresContext* aCX) = 0;
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virtual void List(FILE* out = stdout, PRInt32 aIndent = 0) const = 0;
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/**
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* Return the number of bytes consumed by this node of content and
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* anything that it can reach.
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*/
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virtual PRUint32 SizeOf(nsISizeofHandler* aHandler) const = 0;
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};
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#endif /* nsIContent_h___ */
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