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lightning-sunbird  0.9+nobinonly
nsXFormsSetValueElement.cpp
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is Mozilla XForms support.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Olli Pettay.
00019  * Portions created by the Initial Developer are Copyright (C) 2004
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *   Olli Pettay <Olli.Pettay@helsinki.fi> (original author)
00024  *
00025  * Alternatively, the contents of this file may be used under the terms of
00026  * either of the GNU General Public License Version 2 or later (the "GPL"),
00027  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00028  * in which case the provisions of the GPL or the LGPL are applicable instead
00029  * of those above. If you wish to allow use of your version of this file only
00030  * under the terms of either the GPL or the LGPL, and not to allow others to
00031  * use your version of this file under the terms of the MPL, indicate your
00032  * decision by deleting the provisions above and replace them with the notice
00033  * and other provisions required by the GPL or the LGPL. If you do not delete
00034  * the provisions above, a recipient may use your version of this file under
00035  * the terms of any one of the MPL, the GPL or the LGPL.
00036  *
00037  * ***** END LICENSE BLOCK ***** */
00038 
00039 #include "nsXFormsActionModuleBase.h"
00040 #include "nsXFormsActionElement.h"
00041 #include "nsIDOM3Node.h"
00042 #include "nsIDOMXPathResult.h"
00043 #include "nsIDOMDocument.h"
00044 #include "nsIDOMEvent.h"
00045 #include "nsIDOMElement.h"
00046 #include "nsIXFormsModelElement.h"
00047 #include "nsXFormsModelElement.h"
00048 #include "nsXFormsUtils.h"
00049 
00050 class nsXFormsSetValueElement : public nsXFormsActionModuleBase
00051 {
00052 public:
00053   nsXFormsSetValueElement();
00054   virtual nsresult HandleSingleAction(nsIDOMEvent* aEvent,
00055                                       nsIXFormsActionElement *aParentAction);
00056 };
00057 
00058 nsXFormsSetValueElement::nsXFormsSetValueElement()
00059 {
00060 }
00061 
00062 nsresult
00063 nsXFormsSetValueElement::HandleSingleAction(nsIDOMEvent            *aEvent,
00064                                       nsIXFormsActionElement *aParentAction)
00065 {
00066   nsCOMPtr<nsIModelElementPrivate> modelPriv;
00067   nsCOMPtr<nsIDOMNode> singleNode;
00068   PRBool succeeded =
00069     nsXFormsUtils::GetSingleNodeBinding(mElement,
00070                                         getter_AddRefs(singleNode),
00071                                         getter_AddRefs(modelPriv));
00072 
00073   if (!succeeded | !modelPriv | !singleNode)
00074     return NS_OK;
00075 
00076   nsAutoString value;
00077   nsAutoString valueAttr;
00078   nsresult rv;
00079   mElement->GetAttribute(NS_LITERAL_STRING("value"), valueAttr);
00080 
00081   if (!valueAttr.IsEmpty()) {
00082     // According to the XForms Errata, the context node for the XPath expression
00083     //   stored in @value should be the node that setvalue is bound to.
00084     nsCOMPtr<nsIDOMXPathResult> xpResult;
00085     rv = nsXFormsUtils::EvaluateXPath(valueAttr, singleNode, mElement,
00086                                       nsIDOMXPathResult::STRING_TYPE,
00087                                       getter_AddRefs(xpResult));
00088     NS_ENSURE_SUCCESS(rv, rv);
00089     if (!xpResult)
00090       return NS_OK;
00091     xpResult->GetStringValue(value);
00092   } else {
00093     nsCOMPtr<nsIDOM3Node> n3(do_QueryInterface(mElement));
00094     n3->GetTextContent(value);
00095   }
00096 
00097   PRBool changed;
00098   rv = modelPriv->SetNodeValue(singleNode, value, !aParentAction, &changed);
00099   NS_ENSURE_SUCCESS(rv, rv);
00100 
00101   if (changed && aParentAction) {
00102     aParentAction->SetRecalculate(modelPriv, PR_TRUE);
00103     aParentAction->SetRevalidate(modelPriv, PR_TRUE);
00104     aParentAction->SetRefresh(modelPriv, PR_TRUE);
00105   }
00106 
00107   return NS_OK;
00108 }
00109 
00110 NS_HIDDEN_(nsresult)
00111 NS_NewXFormsSetValueElement(nsIXTFElement **aResult)
00112 {
00113   *aResult = new nsXFormsSetValueElement();
00114   if (!*aResult)
00115     return NS_ERROR_OUT_OF_MEMORY;
00116 
00117   NS_ADDREF(*aResult);
00118   return NS_OK;
00119 }
00120