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gecko-dev/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 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#ifndef nsIEditor_h__
#define nsIEditor_h__
#include "nsISupports.h"
#include "nscore.h"
#include "nsIDiskDocument.h"
#define NS_IEDITOR_IID \
{/* A3C5EE71-742E-11d2-8F2C-006008310194*/ \
0xa3c5ee71, 0x742e, 0x11d2, \
{0x8f, 0x2c, 0x0, 0x60, 0x8, 0x31, 0x1, 0x94} }
class nsString;
class nsIPresShell;
class nsIDOMNode;
class nsIDOMElement;
class nsIDOMDocument;
class nsIDOMSelection;
class nsITransaction;
class nsIOutputStream;
class nsIEditActionListener;
class nsIDocumentStateListener;
class nsFileSpec;
class nsIEditor : public nsISupports
{
public:
static const nsIID& GetIID() { static nsIID iid = NS_IEDITOR_IID; return iid; }
/* An enum used to describe how to collpase a non-collapsed selection */
typedef enum {
eNone,
eNext,
ePrevious,
eNextWord,
ePreviousWord,
eToBeginningOfLine,
eToEndOfLine
} EDirection;
/**
* Init 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.
* @param aFlags A bitmask of flags for specifying the behavior of the editor.
*/
NS_IMETHOD Init(nsIDOMDocument *aDoc, nsIPresShell *aPresShell, PRUint32 aFlags)=0;
/**
* PostCreate should be called after Init, and is the time that the editor tells
* its documentStateObservers that the document has been created.
*/
NS_IMETHOD PostCreate()=0;
/** return the edit flags for this editor */
NS_IMETHOD GetFlags(PRUint32 *aFlags)=0;
/** set the edit flags for this editor. May be called at any time. */
NS_IMETHOD SetFlags(PRUint32 aFlags)=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;
/* ------------ Selected content removal -------------- */
/**
* 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(EDirection aAction)=0;
/* ------------ Document info and file methods -------------- */
/** Returns true if the document has no *meaningful* content */
NS_IMETHOD GetDocumentIsEmpty(PRBool *aDocumentIsEmpty)=0;
/** Returns true if the document is modifed and needs saving */
NS_IMETHOD GetDocumentModified(PRBool *outDocModified)=0;
/** Returns the current 'Save' document character set */
NS_IMETHOD GetDocumentCharacterSet(PRUnichar** characterSet)=0;
/** Sets the current 'Save' document character set */
NS_IMETHOD SetDocumentCharacterSet(const PRUnichar* characterSet)=0;
/** Save document to a file
* Note: No UI is used
* @param aFileSpec
* The file to save to
* @param aReplaceExisting
* true if replacing an existing file, otherwise false.
* If false and aFileSpec exists, SaveFile returns an error.
* @param aSaveCopy
* true if we are saving off a copy of the document
* without changing the disk file associated with the doc.
* This would correspond to a 'Save Copy As' menu command
* (currently not in our UI)
*/
NS_IMETHOD SaveFile(nsFileSpec *aFileSpec, PRBool aReplaceExisting, PRBool aSaveCopy, nsIDiskDocument::ESaveFileType aSaveFileType)=0;
/* ------------ Transaction methods -------------- */
/** 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;
/** 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;
/** 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;
NS_IMETHOD BeginPlaceHolderTransaction(nsIAtom *aName)=0;
NS_IMETHOD EndPlaceHolderTransaction()=0;
NS_IMETHOD ShouldTxnSetSelection(PRBool *aResult)=0;
/* ------------ Clipboard methods -------------- */
/** 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;
/** Can we cut? True if the doc is modifiable, and we have a non-
* collapsed selection.
*/
NS_IMETHOD CanCut(PRBool &aCanCut)=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;
/** Can we copy? True if we have a non-collapsed selection.
*/
NS_IMETHOD CanCopy(PRBool &aCanCopy)=0;
/** paste the text in the OS clipboard at the cursor position, replacing
* the selected text (if any)
*/
NS_IMETHOD Paste()=0;
/** Can we paste? True if the doc is modifiable, and we have
* pasteable data in the clipboard.
*/
NS_IMETHOD CanPaste(PRBool &aCanPaste)=0;
/* ------------ Selection methods -------------- */
/** sets the document selection to the entire contents of the document */
NS_IMETHOD SelectAll()=0;
/** sets the document selection to the beginning of the document */
NS_IMETHOD BeginningOfDocument()=0;
/** sets the document selection to the end of the document */
NS_IMETHOD EndOfDocument()=0;
/* ------------ Node manipulation methods -------------- */
/**
* Tests if a node is a BLOCK element according the the HTML 4.0 DTD
* This does NOT consider CSS effect on display type
*
* @param aNode the node to test
*/
NS_IMETHOD NodeIsBlock(nsIDOMNode *aNode, PRBool &aIsBlock)=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;
/**
* CloneAttributes() is similar to nsIDOMNode::cloneNode(),
* it assures the attribute nodes of the destination are identical with the source node
* by copying all existing attributes from the source and deleting those not in the source.
* This is used when the destination node (element) already exists
*
* The supplied nodes MUST BE ELEMENTS (most callers are working with nodes)
* @param aDestNode the destination element to operate on
* @param aSourceNode the source element to copy attributes from
*/
NS_IMETHOD CloneAttributes(nsIDOMNode *aDestNode, nsIDOMNode *aSourceNode)=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
* 0=first child, 1=second child, etc.
* any number > number of current children = last child
*/
NS_IMETHOD InsertNode(nsIDOMNode * aNode,
nsIDOMNode * aParent,
PRInt32 aPosition)=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 aLeftNode The left node. It will be deleted.
* @param aRightNode The right node. It will remain after the join.
* @param aParent The parent of aExistingRightNode
*
* There is no requirement that the two nodes be of the same type.
* However, a text node can be merged only with another text node.
*/
NS_IMETHOD JoinNodes(nsIDOMNode *aLeftNode,
nsIDOMNode *aRightNode,
nsIDOMNode *aParent)=0;
/**
* DeleteNode removes aChild from aParent.
* @param aChild The node to delete
*/
NS_IMETHOD DeleteNode(nsIDOMNode * aChild)=0;
/**
* InsertNoneditableTextNode() inserts a noneditable text node, e.g. for formatting.
* @param aParent The parent of the newly created node
* @param aOffset The offset in the parent for the new node
* @param aStr The string contents to be placed in the node
*/
NS_IMETHOD InsertNoneditableTextNode(nsIDOMNode* aParent, PRInt32 aOffset,
nsString& aStr) = 0;
/**
* InsertFormattingForNode() inserts formatting before and/or after a node.
* Usually this will be called immediately after creating a new node.
* @param aNode The node for which to insert formatting.
*/
NS_IMETHOD InsertFormattingForNode(nsIDOMNode* aNode) = 0;
/* ------------ Output methods -------------- */
/**
* Output methods:
* aFormatType is a mime type, like text/plain.
*/
NS_IMETHOD OutputToString(nsString& aOutputString,
const nsString& aFormatType,
PRUint32 aFlags) = 0;
NS_IMETHOD OutputToStream(nsIOutputStream* aOutputStream,
const nsString& aFormatType,
const nsString* aCharsetOverride,
PRUint32 aFlags) = 0;
/* ------------ Various listeners methods -------------- */
/** add an EditActionListener to the editors list of listeners. */
NS_IMETHOD AddEditActionListener(nsIEditActionListener *aListener)=0;
/** Remove an EditActionListener from the editor's list of listeners. */
NS_IMETHOD RemoveEditActionListener(nsIEditActionListener *aListener)=0;
/** Add a DocumentStateListener to the editors list of doc state listeners. */
NS_IMETHOD AddDocumentStateListener(nsIDocumentStateListener *aListener)=0;
/** Remove a DocumentStateListener to the editors list of doc state listeners. */
NS_IMETHOD RemoveDocumentStateListener(nsIDocumentStateListener *aListener)=0;
/* ------------ Debug methods -------------- */
/**
* And a debug method -- show us what the tree looks like right now
*/
NS_IMETHOD DumpContentTree() = 0;
/** Dumps a text representation of the content tree to standard out */
NS_IMETHOD DebugDumpContent() const =0;
/* Run unit tests. Noop in optimized builds */
NS_IMETHOD DebugUnitTests(PRInt32 *outNumTests, PRInt32 *outNumTestsFailed)=0;
};
#endif //nsIEditor_h__
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