pjs/editor/public/nsIEditor.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#ifndef nsIEditor_h__
#define nsIEditor_h__
#include "nsISupports.h"
#include "nscore.h"
class nsIAtom;
class nsIDOMElement;
class nsIDOMNode;
class nsITransaction;
/*
Editor interface to outside world
*/
#define NS_IEDITOR_IID \
{/* A3C5EE71-742E-11d2-8F2C-006008310194*/ \
0xa3c5ee71, 0x742e, 0x11d2, \
{0x8f, 0x2c, 0x0, 0x60, 0x8, 0x31, 0x1, 0x94} }
#define NS_IEDITORFACTORY_IID \
{ /* {E2F4C7F1-864A-11d2-8F38-006008310194}*/ \
0xe2f4c7f1, 0x864a, 0x11d2, \
{ 0x8f, 0x38, 0x0, 0x60, 0x8, 0x31, 0x1, 0x94 } }
#define NS_ITEXTEDITORFACTORY_IID \
{ /* {4a1f5ce0-c1f9-11d2-8f4c-006008159b0c}*/ \
0x4a1f5ce0, 0xc1f9, 0x11d2, \
{ 0x8f, 0x4c, 0x0, 0x60, 0x8, 0x15, 0x9b, 0xc } }
#define NS_IHTMLEDITORFACTORY_IID \
{ /* BD62F312-CB8A-11d2-983A-00805F8AA8B8 */ \
0xbd62f312, 0xcb8a, 0x11d2, \
{ 0x98, 0x3a, 0x0, 0x80, 0x5f, 0x8a, 0xa8, 0xb8 } }
class nsIDOMDocument;
class nsIDOMSelection;
class nsIPresShell;
class nsString;
/**
* A generic editor interface.
* <P>
* nsIEditor is the base interface used by applications to communicate with the editor.
* It makes no assumptions about the kind of content it is editing,
* other than the content being a DOM tree.
*/
class nsIEditor : public nsISupports{
public:
typedef enum {eLTR=0, eRTL=1} Direction;
static nsString& GetTextNodeTag();
static const nsIID& GetIID() { static nsIID iid = NS_IEDITOR_IID; return iid; }
/**
* Init tells is to tell the implementation of nsIEditor to begin its services
* @param aDoc The dom document interface being observed
* @param aPresShell TEMP: The presentation shell displaying the document
* once events can tell us from what pres shell they originated,
* this will no longer be necessary and the editor will no longer be
* linked to a single pres shell.
*/
NS_IMETHOD Init(nsIDOMDocument *aDoc, nsIPresShell *aPresShell )=0;
/**
* return the DOM Document this editor is associated with
*
* @param aDoc [OUT] the dom interface being observed, refcounted
*/
NS_IMETHOD GetDocument(nsIDOMDocument **aDoc)=0;
/**
* return the presentation shell this editor is associated with
*
* @param aPS [OUT] the pres shell, refcounted
*/
NS_IMETHOD GetPresShell(nsIPresShell **aPS)=0;
/**
* return the DOM Selection for the presentation shell that has focus
* (or most recently had focus.)
* @param aSelection [OUT] the dom interface for the selection
*/
NS_IMETHOD GetSelection(nsIDOMSelection **aSelection)=0;
/**
* SetAttribute() sets the attribute of aElement.
* No checking is done to see if aAttribute is a legal attribute of the node,
* or if aValue is a legal value of aAttribute.
*
* @param aElement the content element to operate on
* @param aAttribute the string representation of the attribute to set
* @param aValue the value to set aAttribute to
*/
NS_IMETHOD SetAttribute(nsIDOMElement * aElement,
const nsString& aAttribute,
const nsString& aValue)=0;
/**
* GetAttributeValue() retrieves the attribute's value for aElement.
*
* @param aElement the content element to operate on
* @param aAttribute the string representation of the attribute to get
* @param aResultValue the value of aAttribute. only valid if aResultIsSet is PR_TRUE
* @param aResultIsSet PR_TRUE if aAttribute is set on the current node, PR_FALSE if it is not.
*/
NS_IMETHOD GetAttributeValue(nsIDOMElement * aElement,
const nsString& aAttribute,
nsString& aResultValue,
PRBool& aResultIsSet)=0;
/**
* RemoveAttribute() deletes aAttribute from the attribute list of aElement.
* If aAttribute is not an attribute of aElement, nothing is done.
*
* @param aElement the content element to operate on
* @param aAttribute the string representation of the attribute to get
*/
NS_IMETHOD RemoveAttribute(nsIDOMElement * aElement,
const nsString& aAttribute)=0;
/**
* CreateNode instantiates a new element of type aTag and inserts it into aParent at aPosition.
* @param aTag The type of object to create
* @param aParent The node to insert the new object into
* @param aPosition The place in aParent to insert the new node
* @param aNewNode [OUT] The node created. Caller must release aNewNode.
*/
NS_IMETHOD CreateNode(const nsString& aTag,
nsIDOMNode * aParent,
PRInt32 aPosition,
nsIDOMNode ** aNewNode)=0;
/**
* InsertNode inserts aNode into aParent at aPosition.
* No checking is done to verify the legality of the insertion. That is the
* responsibility of the caller.
* @param aNode The DOM Node to insert.
* @param aParent The node to insert the new object into
* @param aPosition The place in aParent to insert the new node
*/
NS_IMETHOD InsertNode(nsIDOMNode * aNode,
nsIDOMNode * aParent,
PRInt32 aPosition)=0;
/**
* InsertText() Inserts a string at the current location, given by the selection.
* If the selection is not collapsed, the selection is deleted and the insertion
* takes place at the resulting collapsed selection.
*
* NOTE: what happens if the string contains a CR?
*
* @param aString the string to be inserted
*/
NS_IMETHOD InsertText(const nsString& aStringToInsert)=0;
/**
* DeleteNode removes aChild from aParent.
* If aChild is not a child of aParent, nothing is done and an error is returned.
* @param aChild The node to delete
*/
NS_IMETHOD DeleteNode(nsIDOMNode * aChild)=0;
/**
* DeleteSelection removes all nodes in the current selection.
* @param aDir if eLTR, delete to the right (for example, the DEL key)
* if eRTL, delete to the left (for example, the BACKSPACE key)
*/
NS_IMETHOD DeleteSelection(nsIEditor::Direction aDir)=0;
/**
* DeleteSelectionAndCreateNode combines DeleteSelection and CreateNode
* It deletes only if there is something selected (doesn't do DEL, BACKSPACE action)
* @param aTag The type of object to create
* @param aNewNode [OUT] The node created. Caller must release aNewNode.
*/
NS_IMETHOD DeleteSelectionAndCreateNode(const nsString& aTag, nsIDOMNode ** aNewNode)=0;
/**
* SplitNode() creates a new node identical to an existing node, and split the contents between the two nodes
* @param aExistingRightNode the node to split. It will become the new node's next sibling.
* @param aOffset the offset of aExistingRightNode's content|children to do the split at
* @param aNewLeftNode [OUT] the new node resulting from the split, becomes aExistingRightNode's previous sibling.
*/
NS_IMETHOD SplitNode(nsIDOMNode * aExistingRightNode,
PRInt32 aOffset,
nsIDOMNode ** aNewLeftNode)=0;
/**
* JoinNodes() takes 2 nodes and merge their content|children.
* @param aNodeToKeep The node that will remain after the join.
* @param aNodeToJoin The node that will be joined with aNodeToKeep.
* There is no requirement that the two nodes be of the same type.
* @param aParent The parent of aExistingRightNode
* @param aNodeToKeepIsFirst if PR_TRUE, the contents|children of aNodeToKeep come before the
* contents|children of aNodeToJoin, otherwise their positions are switched.
*/
NS_IMETHOD JoinNodes(nsIDOMNode *aNodeToKeep,
nsIDOMNode *aNodeToJoin,
nsIDOMNode *aParent,
PRBool aNodeToKeepIsFirst)=0;
/**
* Insert a break into the content model.<br>
* The interpretation of a break is up to the rule system:
* it may enter a character, split a node in the tree, etc.
*/
NS_IMETHOD InsertBreak()=0;
/** turn the undo system on or off
* @param aEnable if PR_TRUE, the undo system is turned on if it is available
* if PR_FALSE the undo system is turned off if it was previously on
* @return if aEnable is PR_TRUE, returns NS_OK if the undo system could be initialized properly
* if aEnable is PR_FALSE, returns NS_OK.
*/
NS_IMETHOD EnableUndo(PRBool aEnable)=0;
/** Do() fires a transaction. It is provided here so clients can create their own transactions.
* If a transaction manager is present, it is used.
* Otherwise, the transaction is just executed directly.
*
* @param aTxn the transaction to execute
*/
NS_IMETHOD Do(nsITransaction *aTxn)=0;
/** Undo reverses the effects of the last Do operation, if Undo is enabled in the editor.
* It is provided here so clients need no knowledge of whether the editor has a transaction manager or not.
* If a transaction manager is present, it is told to undo and the result of
* that undo is returned.
* Otherwise, the Undo request is ignored and an error NS_ERROR_NOT_AVAILABLE is returned.
*
*/
NS_IMETHOD Undo(PRUint32 aCount)=0;
/** returns state information about the undo system.
* @param aIsEnabled [OUT] PR_TRUE if undo is enabled
* @param aCanUndo [OUT] PR_TRUE if at least one transaction is currently ready to be undone.
*/
NS_IMETHOD CanUndo(PRBool &aIsEnabled, PRBool &aCanUndo)=0;
/** Redo reverses the effects of the last Undo operation
* It is provided here so clients need no knowledge of whether the editor has a transaction manager or not.
* If a transaction manager is present, it is told to redo and the result of the previously undone
* transaction is reapplied to the document.
* If no transaction is available for Redo, or if the document has no transaction manager,
* the Redo request is ignored and an error NS_ERROR_NOT_AVAILABLE is returned.
*
*/
NS_IMETHOD Redo(PRUint32 aCount)=0;
/** returns state information about the redo system.
* @param aIsEnabled [OUT] PR_TRUE if redo is enabled
* @param aCanRedo [OUT] PR_TRUE if at least one transaction is currently ready to be redone.
*/
NS_IMETHOD CanRedo(PRBool &aIsEnabled, PRBool &aCanRedo)=0;
/** BeginTransaction is a signal from the caller to the editor that the caller will execute multiple updates
* to the content tree that should be treated as a single logical operation,
* in the most efficient way possible.<br>
* All transactions executed between a call to BeginTransaction and EndTransaction will be undoable as
* an atomic action.<br>
* EndTransaction must be called after BeginTransaction.<br>
* Calls to BeginTransaction can be nested, as long as EndTransaction is called once per BeginUpdate.
*/
NS_IMETHOD BeginTransaction()=0;
/** EndTransaction is a signal to the editor that the caller is finished updating the content model.<br>
* BeginUpdate must be called before EndTransaction is called.<br>
* Calls to BeginTransaction can be nested, as long as EndTransaction is called once per BeginTransaction.
*/
NS_IMETHOD EndTransaction()=0;
/** Get the layout's frame object associated with the node
* Needed when we must get geometric layout info, such as what column a table cell is in.
* @param aNode The DOM node we need the frame for
* @param aLayoutObject The pointer where the resulting object is placed
*/
NS_IMETHOD GetLayoutObject(nsIDOMNode *aNode, nsISupports **aLayoutObject)=0;
/** scroll the viewport so the selection is in view.
* @param aScrollToBegin PR_TRUE if the beginning of the selection is to be scrolled into view.
* PR_FALSE if the end of the selection is to be scrolled into view
*/
NS_IMETHOD ScrollIntoView(PRBool aScrollToBegin)=0;
/** sets the document selection to the entire contents of the document */
NS_IMETHOD SelectAll()=0;
/** cut the currently selected text, putting it into the OS clipboard
* What if no text is selected?
* What about mixed selections?
* What are the clipboard formats?
*/
NS_IMETHOD Cut()=0;
/** copy the currently selected text, putting it into the OS clipboard
* What if no text is selected?
* What about mixed selections?
* What are the clipboard formats?
*/
NS_IMETHOD Copy()=0;
/** paste the text in the OS clipboard at the cursor position, replacing
* the selected text (if any)
*/
NS_IMETHOD Paste()=0;
};
#endif //nsIEditor_h__