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pjs/editor/base/nsTextEditRules.cpp

553 строки
18 KiB
C++
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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.
*/
#include "nsTextEditRules.h"
#include "nsTextEditor.h"
#include "PlaceholderTxn.h"
#include "InsertTextTxn.h"
#include "nsCOMPtr.h"
#include "nsIDOMNode.h"
#include "nsIDOMElement.h"
#include "nsIDOMNodeList.h"
#include "nsIDOMSelection.h"
#include "nsIDOMRange.h"
#include "nsIDOMCharacterData.h"
#include "nsIEnumerator.h"
#include "nsIContent.h"
const static char* kMOZEditorBogusNodeAttr="MOZ_EDITOR_BOGUS_NODE";
const static char* kMOZEditorBogusNodeValue="TRUE";
static NS_DEFINE_IID(kPlaceholderTxnIID, PLACEHOLDER_TXN_IID);
static PRBool NodeIsType(nsIDOMNode *aNode, nsIAtom *aTag)
{
nsCOMPtr<nsIDOMElement>element;
element = do_QueryInterface(aNode);
if (element)
{
nsAutoString tag;
element->GetTagName(tag);
if (tag.Equals(aTag))
{
return PR_TRUE;
}
}
return PR_FALSE;
}
PRBool IsEditable(nsIDOMNode *aNode)
{
if (!aNode) return PR_FALSE;
nsCOMPtr<nsIDOMElement>element;
element = do_QueryInterface(aNode);
if (element)
{
nsAutoString att(kMOZEditorBogusNodeAttr);
nsAutoString val;
nsresult result = element->GetAttribute(att, val);
if (val.Equals(kMOZEditorBogusNodeValue)) {
return PR_FALSE;
}
else {
return PR_TRUE;
}
}
else
{
nsCOMPtr<nsIDOMCharacterData>text;
text = do_QueryInterface(aNode);
if (text)
{
nsAutoString data;
text->GetData(data);
if (0==data.Length()) {
return PR_FALSE;
}
if ('\n'==data[0]) {
return PR_FALSE;
}
else {
return PR_TRUE;
}
}
}
return PR_TRUE;
}
nsTextEditRules::nsTextEditRules()
{
mEditor = nsnull;
}
nsTextEditRules::~nsTextEditRules()
{
// do NOT delete mEditor here. We do not hold a ref count to mEditor. mEditor owns our lifespan.
}
NS_IMETHODIMP
nsTextEditRules::Init(nsTextEditor *aEditor)
{
// null aNextRule is ok
if (!aEditor) { return NS_ERROR_NULL_POINTER; }
mEditor = aEditor; // we hold a non-refcounted reference back to our editor
return NS_OK;
}
NS_IMETHODIMP
nsTextEditRules::WillInsert(nsIDOMSelection *aSelection, PRBool *aCancel)
{
if (!aSelection || !aCancel) { return NS_ERROR_NULL_POINTER; }
// initialize out param
*aCancel = PR_FALSE;
// check for the magic content node and delete it if it exists
if (mBogusNode)
{
mEditor->DeleteNode(mBogusNode);
mBogusNode = do_QueryInterface(nsnull);
// there is no longer any legit selection, so clear it.
aSelection->ClearSelection();
}
return NS_OK;
}
NS_IMETHODIMP
nsTextEditRules::DidInsert(nsIDOMSelection *aSelection, nsresult aResult)
{
return NS_OK;
}
NS_IMETHODIMP
nsTextEditRules::WillInsertText(nsIDOMSelection *aSelection,
const nsString& aInputString,
PRBool *aCancel,
nsString& aOutputString,
PlaceholderTxn **aTxn)
{
if (!aSelection || !aCancel) { return NS_ERROR_NULL_POINTER; }
// initialize out param
*aCancel = PR_FALSE;
// by default, we insert what we're told to insert
aOutputString = aInputString;
if (mBogusNode)
{
nsresult result = TransactionFactory::GetNewTransaction(kPlaceholderTxnIID, (EditTxn **)aTxn);
if (NS_FAILED(result)) { return result; }
if (!*aTxn) { return NS_ERROR_NULL_POINTER; }
(*aTxn)->SetName(InsertTextTxn::gInsertTextTxnName);
mEditor->Do(*aTxn);
}
nsresult result = WillInsert(aSelection, aCancel);
return result;
}
NS_IMETHODIMP
nsTextEditRules::DidInsertText(nsIDOMSelection *aSelection,
const nsString& aStringToInsert,
nsresult aResult)
{
return DidInsert(aSelection, aResult);
}
NS_IMETHODIMP
nsTextEditRules::WillInsertBreak(nsIDOMSelection *aSelection, PRBool *aCancel)
{
if (!aSelection || !aCancel) { return NS_ERROR_NULL_POINTER; }
// initialize out param
*aCancel = PR_FALSE;
return WillInsert(aSelection, aCancel);
}
// XXX: this code is all experimental, and has no effect on the content model yet
// the point here is to collapse adjacent BR's into P's
NS_IMETHODIMP
nsTextEditRules::DidInsertBreak(nsIDOMSelection *aSelection, nsresult aResult)
{
nsresult result = aResult; // if aResult is an error, we return it.
if (!aSelection) { return NS_ERROR_NULL_POINTER; }
PRBool isCollapsed;
aSelection->IsCollapsed(&isCollapsed);
NS_ASSERTION(PR_TRUE==isCollapsed, "selection not collapsed after insert break.");
// if the insert break resulted in consecutive BR tags,
// collapse the two BR tags into a single P
if (NS_SUCCEEDED(result))
{
nsCOMPtr<nsIEnumerator> enumerator;
enumerator = do_QueryInterface(aSelection,&result);
if (enumerator)
{
enumerator->First();
nsISupports *currentItem;
result = enumerator->CurrentItem(&currentItem);
if ((NS_SUCCEEDED(result)) && currentItem)
{
result = NS_ERROR_UNEXPECTED;
nsCOMPtr<nsIDOMRange> range( do_QueryInterface(currentItem) );
if (range)
{
nsIAtom *brTag = NS_NewAtom("BR");
nsCOMPtr<nsIDOMNode> startNode;
result = range->GetStartParent(getter_AddRefs(startNode));
if ((NS_SUCCEEDED(result)) && startNode)
{
PRInt32 offset;
range->GetStartOffset(&offset);
nsCOMPtr<nsIDOMNodeList>startNodeChildren;
result = startNode->GetChildNodes(getter_AddRefs(startNodeChildren));
if ((NS_SUCCEEDED(result)) && startNodeChildren)
{
nsCOMPtr<nsIDOMNode> selectedNode;
result = startNodeChildren->Item(offset, getter_AddRefs(selectedNode));
if ((NS_SUCCEEDED(result)) && selectedNode)
{
nsCOMPtr<nsIDOMNode> prevNode;
result = selectedNode->GetPreviousSibling(getter_AddRefs(prevNode));
if ((NS_SUCCEEDED(result)) && prevNode)
{
if (PR_TRUE==NodeIsType(prevNode, brTag))
{ // the previous node is a BR, check it's siblings
nsCOMPtr<nsIDOMNode> leftNode;
result = prevNode->GetPreviousSibling(getter_AddRefs(leftNode));
if ((NS_SUCCEEDED(result)) && leftNode)
{
if (PR_TRUE==NodeIsType(leftNode, brTag))
{ // left sibling is also a BR, collapse
printf("1\n");
}
else
{
if (PR_TRUE==NodeIsType(selectedNode, brTag))
{ // right sibling is also a BR, collapse
printf("2\n");
}
}
}
}
}
// now check the next node from selectedNode
nsCOMPtr<nsIDOMNode> nextNode;
result = selectedNode->GetNextSibling(getter_AddRefs(nextNode));
if ((NS_SUCCEEDED(result)) && nextNode)
{
if (PR_TRUE==NodeIsType(nextNode, brTag))
{ // the previous node is a BR, check it's siblings
nsCOMPtr<nsIDOMNode> rightNode;
result = nextNode->GetNextSibling(getter_AddRefs(rightNode));
if ((NS_SUCCEEDED(result)) && rightNode)
{
if (PR_TRUE==NodeIsType(rightNode, brTag))
{ // right sibling is also a BR, collapse
printf("3\n");
}
else
{
if (PR_TRUE==NodeIsType(selectedNode, brTag))
{ // left sibling is also a BR, collapse
printf("4\n");
}
}
}
}
}
}
}
}
NS_RELEASE(brTag);
}
}
}
}
return result;
}
NS_IMETHODIMP
nsTextEditRules::GetInsertBreakTag(nsIAtom **aTag)
{
if (!aTag) { return NS_ERROR_NULL_POINTER; }
*aTag = NS_NewAtom("BR");
return NS_OK;
}
NS_IMETHODIMP
nsTextEditRules::WillDeleteSelection(nsIDOMSelection *aSelection, PRBool *aCancel)
{
if (!aSelection || !aCancel) { return NS_ERROR_NULL_POINTER; }
// initialize out param
*aCancel = PR_FALSE;
// if there is only bogus content, cancel the operation
if (mBogusNode) {
*aCancel = PR_TRUE;
return NS_OK;
}
return NS_OK;
}
// if the document is empty, insert a bogus text node with a &nbsp;
// if we ended up with consecutive text nodes, merge them
NS_IMETHODIMP
nsTextEditRules::DidDeleteSelection(nsIDOMSelection *aSelection, nsresult aResult)
{
nsresult result = aResult; // if aResult is an error, we just return it
if (!aSelection) { return NS_ERROR_NULL_POINTER; }
PRBool isCollapsed;
aSelection->IsCollapsed(&isCollapsed);
NS_ASSERTION(PR_TRUE==isCollapsed, "selection not collapsed after delete selection.");
// if the delete selection resulted in no content
// insert a special bogus text node with a &nbsp; character in it.
if (NS_SUCCEEDED(result)) // only do this work if DeleteSelection completed successfully
{
nsCOMPtr<nsIDOMDocument>doc;
mEditor->GetDocument(getter_AddRefs(doc));
nsCOMPtr<nsIDOMNodeList>nodeList;
nsAutoString bodyTag = "body";
nsresult result = doc->GetElementsByTagName(bodyTag, getter_AddRefs(nodeList));
if ((NS_SUCCEEDED(result)) && nodeList)
{
PRUint32 count;
nodeList->GetLength(&count);
NS_ASSERTION(1==count, "there is not exactly 1 body in the document!");
nsCOMPtr<nsIDOMNode>bodyNode;
result = nodeList->Item(0, getter_AddRefs(bodyNode));
if ((NS_SUCCEEDED(result)) && bodyNode)
{ // now we've got the body tag.
// iterate the body tag, looking for editable content
// if no editable content is found, insert the bogus node
PRBool needsBogusContent=PR_TRUE;
nsCOMPtr<nsIDOMNode>bodyChild;
result = bodyNode->GetFirstChild(getter_AddRefs(bodyChild));
while ((NS_SUCCEEDED(result)) && bodyChild)
{
if (PR_TRUE==IsEditable(bodyChild))
{
needsBogusContent = PR_FALSE;
break;
}
nsCOMPtr<nsIDOMNode>temp;
bodyChild->GetNextSibling(getter_AddRefs(temp));
bodyChild = do_QueryInterface(temp);
}
if (PR_TRUE==needsBogusContent)
{
// set mBogusNode to be the newly created <P>
result = mEditor->CreateNode(nsAutoString("P"), bodyNode, 0,
getter_AddRefs(mBogusNode));
if ((NS_SUCCEEDED(result)) && mBogusNode)
{
nsCOMPtr<nsIDOMNode>newTNode;
result = mEditor->CreateNode(nsIEditor::GetTextNodeTag(), mBogusNode, 0,
getter_AddRefs(newTNode));
if ((NS_SUCCEEDED(result)) && newTNode)
{
nsCOMPtr<nsIDOMCharacterData>newNodeAsText;
newNodeAsText = do_QueryInterface(newTNode);
if (newNodeAsText)
{
nsAutoString data;
data += 160;
newNodeAsText->SetData(data);
aSelection->Collapse(newTNode, 0);
}
}
// make sure we know the PNode is bogus
nsCOMPtr<nsIDOMElement>newPElement;
newPElement = do_QueryInterface(mBogusNode);
if (newPElement)
{
nsAutoString att(kMOZEditorBogusNodeAttr);
nsAutoString val(kMOZEditorBogusNodeValue);
newPElement->SetAttribute(att, val);
}
}
}
}
}
// if we don't have an empty document, check the selection to see if any collapsing is necessary
if (!mBogusNode)
{
nsCOMPtr<nsIDOMNode>anchor;
PRInt32 offset;
nsresult result = aSelection->GetAnchorNodeAndOffset(getter_AddRefs(anchor), &offset);
if ((NS_SUCCEEDED(result)) && anchor)
{
nsCOMPtr<nsIDOMNodeList> anchorChildren;
result = anchor->GetChildNodes(getter_AddRefs(anchorChildren));
nsCOMPtr<nsIDOMNode> selectedNode;
if ((NS_SUCCEEDED(result)) && anchorChildren) {
result = anchorChildren->Item(offset, getter_AddRefs(selectedNode));
}
else {
selectedNode = do_QueryInterface(anchor);
}
if ((NS_SUCCEEDED(result)) && selectedNode)
{
nsCOMPtr<nsIDOMCharacterData>selectedNodeAsText;
selectedNodeAsText = do_QueryInterface(selectedNode);
if (selectedNodeAsText)
{
nsCOMPtr<nsIDOMNode> siblingNode;
selectedNode->GetPreviousSibling(getter_AddRefs(siblingNode));
if (siblingNode)
{
nsCOMPtr<nsIDOMCharacterData>siblingNodeAsText;
siblingNodeAsText = do_QueryInterface(siblingNode);
if (siblingNodeAsText)
{
PRUint32 siblingLength; // the length of siblingNode before the join
siblingNodeAsText->GetLength(&siblingLength);
nsCOMPtr<nsIDOMNode> parentNode;
selectedNode->GetParentNode(getter_AddRefs(parentNode));
result = mEditor->JoinNodes(siblingNode, selectedNode, parentNode);
// set selection to point between the end of siblingNode and start of selectedNode
aSelection->Collapse(siblingNode, siblingLength);
selectedNode = do_QueryInterface(siblingNode); // subsequent code relies on selectedNode
// being the real node in the DOM tree
}
}
selectedNode->GetNextSibling(getter_AddRefs(siblingNode));
if (siblingNode)
{
nsCOMPtr<nsIDOMCharacterData>siblingNodeAsText;
siblingNodeAsText = do_QueryInterface(siblingNode);
if (siblingNodeAsText)
{
PRUint32 selectedNodeLength; // the length of siblingNode before the join
selectedNodeAsText->GetLength(&selectedNodeLength);
nsCOMPtr<nsIDOMNode> parentNode;
selectedNode->GetParentNode(getter_AddRefs(parentNode));
result = mEditor->JoinNodes(selectedNode, siblingNode, parentNode);
// set selection
aSelection->Collapse(selectedNode, selectedNodeLength);
}
}
}
}
}
}
}
return result;
}
NS_IMETHODIMP
nsTextEditRules::WillUndo(nsIDOMSelection *aSelection, PRBool *aCancel)
{
if (!aSelection || !aCancel) { return NS_ERROR_NULL_POINTER; }
// initialize out param
*aCancel = PR_FALSE;
return NS_OK;
}
/* the idea here is to see if the magic empty node has suddenly reappeared as the result of the undo.
* if it has, set our state so we remember it.
* There is a tradeoff between doing here and at redo, or doing it everywhere else that might care.
* Since undo and redo are relatively rare, it makes sense to take the (small) performance hit here.
*/
NS_IMETHODIMP
nsTextEditRules:: DidUndo(nsIDOMSelection *aSelection, nsresult aResult)
{
nsresult result = aResult; // if aResult is an error, we return it.
if (!aSelection) { return NS_ERROR_NULL_POINTER; }
if (NS_SUCCEEDED(result))
{
if (mBogusNode) {
mBogusNode = do_QueryInterface(nsnull);
}
else
{
nsCOMPtr<nsIDOMNode>node;
PRInt32 offset;
nsresult result = aSelection->GetAnchorNodeAndOffset(getter_AddRefs(node), &offset);
while ((NS_SUCCEEDED(result)) && node)
{
nsCOMPtr<nsIDOMElement>element;
element = do_QueryInterface(node);
if (element)
{
nsAutoString att(kMOZEditorBogusNodeAttr);
nsAutoString val;
nsresult result = element->GetAttribute(att, val);
if (val.Equals(kMOZEditorBogusNodeValue)) {
mBogusNode = do_QueryInterface(element);
}
}
nsCOMPtr<nsIDOMNode> temp;
result = node->GetParentNode(getter_AddRefs(temp));
node = do_QueryInterface(temp);
}
}
}
return result;
}
NS_IMETHODIMP
nsTextEditRules::WillRedo(nsIDOMSelection *aSelection, PRBool *aCancel)
{
if (!aSelection || !aCancel) { return NS_ERROR_NULL_POINTER; }
// initialize out param
*aCancel = PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP
nsTextEditRules::DidRedo(nsIDOMSelection *aSelection, nsresult aResult)
{
nsresult result = aResult; // if aResult is an error, we return it.
if (!aSelection) { return NS_ERROR_NULL_POINTER; }
if (NS_SUCCEEDED(result))
{
if (mBogusNode) {
mBogusNode = do_QueryInterface(nsnull);
}
else
{
nsCOMPtr<nsIDOMNode>node;
PRInt32 offset;
nsresult result = aSelection->GetAnchorNodeAndOffset(getter_AddRefs(node), &offset);
while ((NS_SUCCEEDED(result)) && node)
{
nsCOMPtr<nsIDOMElement>element;
element = do_QueryInterface(node);
if (element)
{
nsAutoString att(kMOZEditorBogusNodeAttr);
nsAutoString val;
nsresult result = element->GetAttribute(att, val);
if (val.Equals(kMOZEditorBogusNodeValue)) {
mBogusNode = do_QueryInterface(element);
}
}
nsCOMPtr<nsIDOMNode> temp;
result = node->GetParentNode(getter_AddRefs(temp));
node = do_QueryInterface(temp);
}
}
}
return result;
}
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