mirror of
https://github.com/mozilla/gecko-dev.git
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53b3380a59
made a special case for typing with BR as the selection (as after an InsertBreak.) made DEL and BACKSPACE at the beginning and end of a text node fixes bugs 3742 and 3756 (with permission from choff and gkostello)
332 lines
13 KiB
C++
332 lines
13 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 nsIEditor_h__
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#define nsIEditor_h__
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#include "nsISupports.h"
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#include "nscore.h"
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class nsIAtom;
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class nsIDOMElement;
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class nsIDOMNode;
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class nsITransaction;
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/*
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Editor interface to outside world
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*/
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#define NS_IEDITOR_IID \
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{/* A3C5EE71-742E-11d2-8F2C-006008310194*/ \
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0xa3c5ee71, 0x742e, 0x11d2, \
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{0x8f, 0x2c, 0x0, 0x60, 0x8, 0x31, 0x1, 0x94} }
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#define NS_IEDITORFACTORY_IID \
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{ /* {E2F4C7F1-864A-11d2-8F38-006008310194}*/ \
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0xe2f4c7f1, 0x864a, 0x11d2, \
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{ 0x8f, 0x38, 0x0, 0x60, 0x8, 0x31, 0x1, 0x94 } }
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#define NS_ITEXTEDITORFACTORY_IID \
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{ /* {4a1f5ce0-c1f9-11d2-8f4c-006008159b0c}*/ \
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0x4a1f5ce0, 0xc1f9, 0x11d2, \
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{ 0x8f, 0x4c, 0x0, 0x60, 0x8, 0x15, 0x9b, 0xc } }
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#define NS_IHTMLEDITORFACTORY_IID \
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{ /* BD62F312-CB8A-11d2-983A-00805F8AA8B8 */ \
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0xbd62f312, 0xcb8a, 0x11d2, \
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{ 0x98, 0x3a, 0x0, 0x80, 0x5f, 0x8a, 0xa8, 0xb8 } }
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class nsIDOMDocument;
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class nsIDOMSelection;
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class nsIPresShell;
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class nsString;
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/**
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* A generic editor interface.
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* <P>
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* nsIEditor is the base interface used by applications to communicate with the editor.
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* It makes no assumptions about the kind of content it is editing,
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* other than the content being a DOM tree.
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*/
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class nsIEditor : public nsISupports{
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public:
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typedef enum {eLTR=0, eRTL=1} Direction;
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static nsString& GetTextNodeTag();
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static const nsIID& GetIID() { static nsIID iid = NS_IEDITOR_IID; return iid; }
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/**
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* Init tells is to tell the implementation of nsIEditor to begin its services
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* @param aDoc The dom document interface being observed
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* @param aPresShell TEMP: The presentation shell displaying the document
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* once events can tell us from what pres shell they originated,
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* this will no longer be necessary and the editor will no longer be
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* linked to a single pres shell.
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*/
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NS_IMETHOD Init(nsIDOMDocument *aDoc, nsIPresShell *aPresShell )=0;
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/**
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* return the DOM Document this editor is associated with
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*
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* @param aDoc [OUT] the dom interface being observed, refcounted
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*/
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NS_IMETHOD GetDocument(nsIDOMDocument **aDoc)=0;
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/**
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* return the presentation shell this editor is associated with
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*
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* @param aPS [OUT] the pres shell, refcounted
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*/
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NS_IMETHOD GetPresShell(nsIPresShell **aPS)=0;
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/**
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* return the DOM Selection for the presentation shell that has focus
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* (or most recently had focus.)
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* @param aSelection [OUT] the dom interface for the selection
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*/
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NS_IMETHOD GetSelection(nsIDOMSelection **aSelection)=0;
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/**
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* SetAttribute() sets the attribute of aElement.
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* No checking is done to see if aAttribute is a legal attribute of the node,
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* or if aValue is a legal value of aAttribute.
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*
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* @param aElement the content element to operate on
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* @param aAttribute the string representation of the attribute to set
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* @param aValue the value to set aAttribute to
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*/
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NS_IMETHOD SetAttribute(nsIDOMElement * aElement,
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const nsString& aAttribute,
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const nsString& aValue)=0;
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/**
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* GetAttributeValue() retrieves the attribute's value for aElement.
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*
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* @param aElement the content element to operate on
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* @param aAttribute the string representation of the attribute to get
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* @param aResultValue the value of aAttribute. only valid if aResultIsSet is PR_TRUE
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* @param aResultIsSet PR_TRUE if aAttribute is set on the current node, PR_FALSE if it is not.
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*/
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NS_IMETHOD GetAttributeValue(nsIDOMElement * aElement,
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const nsString& aAttribute,
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nsString& aResultValue,
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PRBool& aResultIsSet)=0;
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/**
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* RemoveAttribute() deletes aAttribute from the attribute list of aElement.
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* If aAttribute is not an attribute of aElement, nothing is done.
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*
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* @param aElement the content element to operate on
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* @param aAttribute the string representation of the attribute to get
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*/
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NS_IMETHOD RemoveAttribute(nsIDOMElement * aElement,
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const nsString& aAttribute)=0;
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/**
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* CreateNode instantiates a new element of type aTag and inserts it into aParent at aPosition.
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* @param aTag The type of object to create
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* @param aParent The node to insert the new object into
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* @param aPosition The place in aParent to insert the new node
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* @param aNewNode [OUT] The node created. Caller must release aNewNode.
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*/
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NS_IMETHOD CreateNode(const nsString& aTag,
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nsIDOMNode * aParent,
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PRInt32 aPosition,
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nsIDOMNode ** aNewNode)=0;
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/**
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* InsertNode inserts aNode into aParent at aPosition.
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* No checking is done to verify the legality of the insertion. That is the
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* responsibility of the caller.
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* @param aNode The DOM Node to insert.
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* @param aParent The node to insert the new object into
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* @param aPosition The place in aParent to insert the new node
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*/
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NS_IMETHOD InsertNode(nsIDOMNode * aNode,
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nsIDOMNode * aParent,
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PRInt32 aPosition)=0;
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/**
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* InsertText() Inserts a string at the current location, given by the selection.
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* If the selection is not collapsed, the selection is deleted and the insertion
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* takes place at the resulting collapsed selection.
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*
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* NOTE: what happens if the string contains a CR?
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*
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* @param aString the string to be inserted
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*/
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NS_IMETHOD InsertText(const nsString& aStringToInsert)=0;
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/**
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* DeleteNode removes aChild from aParent.
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* If aChild is not a child of aParent, nothing is done and an error is returned.
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* @param aChild The node to delete
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*/
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NS_IMETHOD DeleteNode(nsIDOMNode * aChild)=0;
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/**
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* DeleteSelection removes all nodes in the current selection.
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* @param aDir if eLTR, delete to the right (for example, the DEL key)
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* if eRTL, delete to the left (for example, the BACKSPACE key)
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*/
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NS_IMETHOD DeleteSelection(nsIEditor::Direction aDir)=0;
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/**
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* DeleteSelectionAndCreateNode combines DeleteSelection and CreateNode
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* It deletes only if there is something selected (doesn't do DEL, BACKSPACE action)
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* @param aTag The type of object to create
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* @param aNewNode [OUT] The node created. Caller must release aNewNode.
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*/
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NS_IMETHOD DeleteSelectionAndCreateNode(const nsString& aTag, nsIDOMNode ** aNewNode)=0;
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/**
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* SplitNode() creates a new node identical to an existing node, and split the contents between the two nodes
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* @param aExistingRightNode the node to split. It will become the new node's next sibling.
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* @param aOffset the offset of aExistingRightNode's content|children to do the split at
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* @param aNewLeftNode [OUT] the new node resulting from the split, becomes aExistingRightNode's previous sibling.
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*/
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NS_IMETHOD SplitNode(nsIDOMNode * aExistingRightNode,
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PRInt32 aOffset,
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nsIDOMNode ** aNewLeftNode)=0;
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/**
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* JoinNodes() takes 2 nodes and merge their content|children.
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* @param aNodeToKeep The left node. It will remain after the join.
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* @param aNodeToJoin The right node.
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* There is no requirement that the two nodes be of the same type.
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* @param aParent The parent of aExistingRightNode
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* @param aNodeToKeepIsFirst if PR_TRUE, the contents|children of aNodeToKeep come before the
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* contents|children of aNodeToJoin, otherwise their positions are switched.
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*/
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NS_IMETHOD JoinNodes(nsIDOMNode *aLeftNode,
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nsIDOMNode *aRightNode,
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nsIDOMNode *aParent)=0;
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/**
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* Insert a break into the content model.<br>
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* The interpretation of a break is up to the rule system:
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* it may enter a character, split a node in the tree, etc.
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*/
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NS_IMETHOD InsertBreak()=0;
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/** turn the undo system on or off
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* @param aEnable if PR_TRUE, the undo system is turned on if it is available
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* if PR_FALSE the undo system is turned off if it was previously on
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* @return if aEnable is PR_TRUE, returns NS_OK if the undo system could be initialized properly
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* if aEnable is PR_FALSE, returns NS_OK.
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*/
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NS_IMETHOD EnableUndo(PRBool aEnable)=0;
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/** Do() fires a transaction. It is provided here so clients can create their own transactions.
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* If a transaction manager is present, it is used.
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* Otherwise, the transaction is just executed directly.
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*
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* @param aTxn the transaction to execute
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*/
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NS_IMETHOD Do(nsITransaction *aTxn)=0;
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/** Undo reverses the effects of the last Do operation, if Undo is enabled in the editor.
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* It is provided here so clients need no knowledge of whether the editor has a transaction manager or not.
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* If a transaction manager is present, it is told to undo and the result of
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* that undo is returned.
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* Otherwise, the Undo request is ignored and an error NS_ERROR_NOT_AVAILABLE is returned.
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*
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*/
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NS_IMETHOD Undo(PRUint32 aCount)=0;
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/** returns state information about the undo system.
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* @param aIsEnabled [OUT] PR_TRUE if undo is enabled
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* @param aCanUndo [OUT] PR_TRUE if at least one transaction is currently ready to be undone.
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*/
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NS_IMETHOD CanUndo(PRBool &aIsEnabled, PRBool &aCanUndo)=0;
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/** Redo reverses the effects of the last Undo operation
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* It is provided here so clients need no knowledge of whether the editor has a transaction manager or not.
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* If a transaction manager is present, it is told to redo and the result of the previously undone
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* transaction is reapplied to the document.
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* If no transaction is available for Redo, or if the document has no transaction manager,
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* the Redo request is ignored and an error NS_ERROR_NOT_AVAILABLE is returned.
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*
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*/
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NS_IMETHOD Redo(PRUint32 aCount)=0;
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/** returns state information about the redo system.
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* @param aIsEnabled [OUT] PR_TRUE if redo is enabled
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* @param aCanRedo [OUT] PR_TRUE if at least one transaction is currently ready to be redone.
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*/
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NS_IMETHOD CanRedo(PRBool &aIsEnabled, PRBool &aCanRedo)=0;
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/** BeginTransaction is a signal from the caller to the editor that the caller will execute multiple updates
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* to the content tree that should be treated as a single logical operation,
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* in the most efficient way possible.<br>
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* All transactions executed between a call to BeginTransaction and EndTransaction will be undoable as
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* an atomic action.<br>
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* EndTransaction must be called after BeginTransaction.<br>
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* Calls to BeginTransaction can be nested, as long as EndTransaction is called once per BeginUpdate.
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*/
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NS_IMETHOD BeginTransaction()=0;
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/** EndTransaction is a signal to the editor that the caller is finished updating the content model.<br>
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* BeginUpdate must be called before EndTransaction is called.<br>
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* Calls to BeginTransaction can be nested, as long as EndTransaction is called once per BeginTransaction.
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*/
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NS_IMETHOD EndTransaction()=0;
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/** Get the layout's frame object associated with the node
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* Needed when we must get geometric layout info, such as what column a table cell is in.
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* @param aNode The DOM node we need the frame for
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* @param aLayoutObject The pointer where the resulting object is placed
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*/
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NS_IMETHOD GetLayoutObject(nsIDOMNode *aNode, nsISupports **aLayoutObject)=0;
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/** scroll the viewport so the selection is in view.
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* @param aScrollToBegin PR_TRUE if the beginning of the selection is to be scrolled into view.
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* PR_FALSE if the end of the selection is to be scrolled into view
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*/
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NS_IMETHOD ScrollIntoView(PRBool aScrollToBegin)=0;
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/** sets the document selection to the entire contents of the document */
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NS_IMETHOD SelectAll()=0;
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/** cut the currently selected text, putting it into the OS clipboard
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* What if no text is selected?
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* What about mixed selections?
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* What are the clipboard formats?
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*/
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NS_IMETHOD Cut()=0;
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/** copy the currently selected text, putting it into the OS clipboard
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* What if no text is selected?
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* What about mixed selections?
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* What are the clipboard formats?
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*/
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NS_IMETHOD Copy()=0;
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/** paste the text in the OS clipboard at the cursor position, replacing
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* the selected text (if any)
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*/
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NS_IMETHOD Paste()=0;
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};
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#endif //nsIEditor_h__
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