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nsXFormsSetIndexElement.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  * Novell, Inc.
00019  * Portions created by the Initial Developer are Copyright (C) 2005
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *  Allan Beaufour <abeaufour@novell.com>
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 <math.h>
00040 
00041 #include "nsIDOMDocument.h"
00042 #include "nsIDOMXPathResult.h"
00043 
00044 #include "nsIXFormsRepeatElement.h"
00045 #include "nsXFormsActionModuleBase.h"
00046 #include "nsXFormsActionElement.h"
00047 
00048 #ifdef DEBUG
00049 //#define DEBUG_XF_SETINDEX
00050 #endif
00051 
00060 class nsXFormsSetIndexElement : public nsXFormsActionModuleBase
00061 {
00062 public:
00063   virtual nsresult HandleSingleAction(nsIDOMEvent* aEvent,
00064                                       nsIXFormsActionElement *aParentAction);
00065 };
00066  
00067 nsresult
00068 nsXFormsSetIndexElement::HandleSingleAction(nsIDOMEvent            *aEvent,
00069                                             nsIXFormsActionElement *aParentAction)
00070 {
00071   // Get @repeat and @index
00072   nsAutoString id, index;
00073   NS_NAMED_LITERAL_STRING(repeatStr, "repeat");
00074   mElement->GetAttribute(repeatStr, id);
00075   NS_NAMED_LITERAL_STRING(indexStr, "index");
00076   mElement->GetAttribute(indexStr, index);
00077   if (id.IsEmpty() || index.IsEmpty()) {
00081     return NS_ERROR_ABORT;
00082   }
00083 
00084 
00085   // Find index (XPath) value
00086   nsresult rv;
00087   nsCOMPtr<nsIModelElementPrivate> model;
00088   nsCOMPtr<nsIDOMXPathResult> result;
00089   // EvaluateNodeBinding uses @bind if @index is not present, but we have
00090   // checked that @index is present above
00091   PRBool usesModelBinding;
00092   rv = nsXFormsUtils::EvaluateNodeBinding(mElement,
00093                                           0,
00094                                           indexStr,
00095                                           EmptyString(),
00096                                           nsIDOMXPathResult::NUMBER_TYPE,
00097                                           getter_AddRefs(model),
00098                                           getter_AddRefs(result),
00099                                           &usesModelBinding);
00100   NS_ENSURE_SUCCESS(rv, rv);
00101   if (!result) {
00102     nsXFormsUtils::ReportError(NS_LITERAL_STRING("indexEvalError"),
00103                                mElement);
00104     return NS_OK;
00105   }
00106   double indexDoub;
00107   rv = result->GetNumberValue(&indexDoub);
00108   NS_ENSURE_SUCCESS(rv, rv);
00109   PRUint32 indexInt = indexDoub < 1 ? 0 : (PRUint32) floor(indexDoub);
00110 
00111 #ifdef DEBUG_XF_SETINDEX
00112   printf("<setindex>: Setting index '%s' to '%d'\n",
00113          NS_ConvertUTF16toUTF8(id).get(),
00114          indexInt);
00115 #endif
00116 
00117   // Find the <repeat> with @id == |id|
00118   nsCOMPtr<nsIDOMElement> repeatElem;
00119   nsXFormsUtils::GetElementByContextId(mElement, id,
00120                                        getter_AddRefs(repeatElem));
00121 
00122   nsCOMPtr<nsIXFormsRepeatElement> repeat = do_QueryInterface(repeatElem);
00123   if (!repeat) {
00124     const PRUnichar *strings[] = { id.get(), repeatStr.get() };
00125     nsXFormsUtils::ReportError(NS_LITERAL_STRING("idRefError"),
00126                                strings, 2, mElement, mElement);
00127     return NS_OK;
00128   }
00129 
00130   // Set the index = |indexInt|
00131   return repeat->SetIndex(&indexInt, PR_FALSE);
00132 }
00133 
00134 NS_HIDDEN_(nsresult)
00135 NS_NewXFormsSetIndexElement(nsIXTFElement **aResult)
00136 {
00137   *aResult = new nsXFormsSetIndexElement();
00138   if (!*aResult)
00139     return NS_ERROR_OUT_OF_MEMORY;
00140 
00141   NS_ADDREF(*aResult);
00142   return NS_OK;
00143 }
00144