extensions/xforms/nsXFormsSetValueElement.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
   7  * the License. You may obtain a copy of the License at
   8  * http://www.mozilla.org/MPL/
   9  *
  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12  * for the specific language governing rights and limitations under the
  13  * License.
  14  *
  15  * The Original Code is Mozilla XForms support.
  16  *
  17  * The Initial Developer of the Original Code is
  18  * Olli Pettay.
  19  * Portions created by the Initial Developer are Copyright (C) 2004
  20  * the Initial Developer. All Rights Reserved.
  21  *
  22  * Contributor(s):
  23  *   Olli Pettay <Olli.Pettay@helsinki.fi> (original author)
  24  *
  25  * Alternatively, the contents of this file may be used under the terms of
  26  * either of the GNU General Public License Version 2 or later (the "GPL"),
  27  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  28  * in which case the provisions of the GPL or the LGPL are applicable instead
  29  * of those above. If you wish to allow use of your version of this file only
  30  * under the terms of either the GPL or the LGPL, and not to allow others to
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  32  * decision by deleting the provisions above and replace them with the notice
  33  * and other provisions required by the GPL or the LGPL. If you do not delete
  34  * the provisions above, a recipient may use your version of this file under
  35  * the terms of any one of the MPL, the GPL or the LGPL.
  36  *
  37  * ***** END LICENSE BLOCK ***** */
  38
  39 #include "nsXFormsActionModuleBase.h"
  40 #include "nsXFormsActionElement.h"
  41 #include "nsIDOM3Node.h"
  42 #include "nsIDOMXPathResult.h"
  43 #include "nsIDOMDocument.h"
  44 #include "nsIDOMEvent.h"
  45 #include "nsIDOMElement.h"
  46 #include "nsIXFormsModelElement.h"
  47 #include "nsXFormsModelElement.h"
  48 #include "nsXFormsUtils.h"
  49
  50 class nsXFormsSetValueElement : public nsXFormsActionModuleBase
  51 {
  52 public:
  53   nsXFormsSetValueElement();
  54   virtual nsresult HandleSingleAction(nsIDOMEvent* aEvent,
  55                                       nsIXFormsActionElement *aParentAction);
  56 };
  57
  58 nsXFormsSetValueElement::nsXFormsSetValueElement()
  59 {
  60 }
  61
  62 nsresult
  63 nsXFormsSetValueElement::HandleSingleAction(nsIDOMEvent            *aEvent,
  64                                             nsIXFormsActionElement *aParentAction)
  65 {
  66   nsCOMPtr<nsIModelElementPrivate> modelPriv;
  67   nsCOMPtr<nsIDOMNode> singleNode;
  68   PRBool succeeded =
  69     nsXFormsUtils::GetSingleNodeBinding(mElement,
  70                                         getter_AddRefs(singleNode),
  71                                         getter_AddRefs(modelPriv));
  72
  73   if (!succeeded | !modelPriv | !singleNode)
  74     return NS_OK;
  75
  76   nsAutoString value;
  77   nsAutoString valueAttr;
  78   nsresult rv;
  79   mElement->GetAttribute(NS_LITERAL_STRING("value"), valueAttr);
  80
  81   if (!valueAttr.IsEmpty()) {
  82     // According to the XForms Errata, the context node for the XPath expression
  83     //   stored in @value should be the node that setvalue is bound to.
  84     nsCOMPtr<nsIDOMXPathResult> xpResult;
  85     rv = nsXFormsUtils::EvaluateXPath(valueAttr, singleNode, mElement,
  86                                       nsIDOMXPathResult::STRING_TYPE,
  87                                       getter_AddRefs(xpResult));
  88     NS_ENSURE_SUCCESS(rv, rv);
  89     if (!xpResult)
  90       return NS_OK;
  91     xpResult->GetStringValue(value);
  92   } else {
  93     nsCOMPtr<nsIDOM3Node> n3(do_QueryInterface(mElement));
  94     n3->GetTextContent(value);
  95   }
  96
  97   PRBool changed;
  98   rv = modelPriv->SetNodeValue(singleNode, value, !aParentAction, &changed);
  99   NS_ENSURE_SUCCESS(rv, rv);
 100
 101   if (changed && aParentAction) {
 102     aParentAction->SetRecalculate(modelPriv, PR_TRUE);
 103     aParentAction->SetRevalidate(modelPriv, PR_TRUE);
 104     aParentAction->SetRefresh(modelPriv, PR_TRUE);
 105   }
 106
 107   return NS_OK;
 108 }
 109
 110 NS_HIDDEN_(nsresult)
 111 NS_NewXFormsSetValueElement(nsIXTFElement **aResult)
 112 {
 113   *aResult = new nsXFormsSetValueElement();
 114   if (!*aResult)
 115     return NS_ERROR_OUT_OF_MEMORY;
 116
 117   NS_ADDREF(*aResult);
 118   return NS_OK;
 119 }
 120