pjs/extensions/xforms/nsXFormsOutputElement.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla 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/MPL/
*
* 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 XForms support.
*
* The Initial Developer of the Original Code is
* Novell, Inc.
* Portions created by the Initial Developer are Copyright (C) 2004
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Allan Beaufour <abeaufour@novell.com>
* Olli Pettay <Olli.Pettay@helsinki.fi>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifdef DEBUG
//#define DEBUG_XF_OUTPUT
#endif
#include "nsAutoPtr.h"
#include "nsCOMPtr.h"
#include "nsMemory.h"
#include "nsString.h"
#include "nsDOMString.h"
#include "nsIDOM3Node.h"
#include "nsIDOMDocument.h"
#include "nsIDOMElement.h"
#include "nsIDOMEventTarget.h"
#include "nsIDOMXPathExpression.h"
#include "nsIDOMXPathResult.h"
#include "nsISchema.h"
#include "nsIModelElementPrivate.h"
#include "nsXFormsDelegateStub.h"
#include "nsXFormsAtoms.h"
#include "nsXFormsUtils.h"
#include "nsIXFormsUIWidget.h"
#include "nsXFormsModelElement.h"
/**
* Implementation of the XForms \<output\> element.
*
* \<output\> is not really that different from \<input\>
* (ie. nsXFormsDelegateStub), except that it has an "value" attribute that
* must be handled separately because it is evaluated to a string result.
*
* @see http://www.w3.org/TR/xforms/slice8.html#ui-output
*/
class nsXFormsOutputElement : public nsXFormsDelegateStub
{
public:
// nsIXFormsControl
NS_IMETHOD Bind(PRBool* aContextChanged);
NS_IMETHOD Refresh();
NS_IMETHOD GetBoundNode(nsIDOMNode **aBoundNode);
// nsIXFormsDelegate
NS_IMETHOD GetValue(nsAString& aValue);
NS_IMETHOD SetValue(const nsAString& aValue);
NS_IMETHOD GetHasBoundNode(PRBool *aHasBoundNode);
virtual PRBool IsContentAllowed();
nsXFormsOutputElement();
private:
// The value of the "value" attribute (if any). Updated by Bind()
nsString mValue;
// Use the "value" attribute
PRBool mUseValueAttribute;
};
nsXFormsOutputElement::nsXFormsOutputElement()
: nsXFormsDelegateStub(NS_LITERAL_STRING("output")),
mUseValueAttribute(PR_FALSE)
{
}
// nsIXFormsControl
nsresult
nsXFormsOutputElement::Bind(PRBool *aContextChanged)
{
SetDOMStringToNull(mValue);
mUseValueAttribute = PR_FALSE;
nsresult rv = nsXFormsDelegateStub::Bind(aContextChanged);
NS_ENSURE_SUCCESS(rv, rv);
if (!mHasParent || !mElement || rv == NS_OK_XFORMS_DEFERRED)
return NS_OK;
// Besides the standard single node binding (SNB) attributes, \<output\>
// also has a "value" attribute, which is used when there are not other SNB
// attributes.
if (!HasBindingAttribute()) {
mUseValueAttribute = PR_TRUE;
} else {
PRBool hasAttr;
rv = mElement->HasAttribute(NS_LITERAL_STRING("ref"), &hasAttr);
NS_ENSURE_SUCCESS(rv, rv);
if (!hasAttr) {
rv = mElement->HasAttribute(NS_LITERAL_STRING("bind"), &hasAttr);
NS_ENSURE_SUCCESS(rv, rv);
mUseValueAttribute = !hasAttr;
}
}
if (!mUseValueAttribute)
return NS_OK;
// Bind to model and set mBoundNode . The bound node is used for setting
// context for our children (our parent's context in the case of @value),
// and the call to ProcessNodeBinding() will not set it.
rv = BindToModel(PR_TRUE);
NS_ENSURE_SUCCESS(rv, rv);
// Process node binding
nsCOMPtr<nsIDOMXPathResult> result;
rv = ProcessNodeBinding(NS_LITERAL_STRING("value"),
nsIDOMXPathResult::STRING_TYPE,
getter_AddRefs(result));
NS_ENSURE_SUCCESS(rv, rv);
if (rv == NS_OK_XFORMS_DEFERRED) {
// Can't leave the output in the model list. Since the xforms processor
// is still deferring binds any contextcontrol helping to set the context
// for the output's value expression probably isn't in the control list
// yet. And if that's the case, we can't have the output in the list
// before the contextcontrol or the output won't bind right once the
// deferred binds finallyhappen. If we got mBoundNode in addition to
// mModel during BindToModel, it isn't likely good, either, so junk it, too.
mBoundNode = nsnull;
if (mModel) {
mModel->RemoveFormControl(this);
mModel = nsnull;
}
return NS_OK;
}
if (result) {
rv = result->GetStringValue(mValue);
NS_ENSURE_SUCCESS(rv, rv);
}
return NS_OK;
}
NS_IMETHODIMP
nsXFormsOutputElement::Refresh()
{
return nsXFormsDelegateStub::Refresh();
}
NS_IMETHODIMP
nsXFormsOutputElement::GetBoundNode(nsIDOMNode **aBoundNode)
{
return !mUseValueAttribute ? nsXFormsDelegateStub::GetBoundNode(aBoundNode)
: NS_OK;
}
NS_IMETHODIMP
nsXFormsOutputElement::GetHasBoundNode(PRBool *aHasBoundNode)
{
NS_ENSURE_ARG_POINTER(aHasBoundNode);
*aHasBoundNode = (mBoundNode && !mUseValueAttribute) ? PR_TRUE : PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP
nsXFormsOutputElement::GetValue(nsAString& aValue)
{
if (mUseValueAttribute) {
aValue = mValue;
return NS_OK;
}
return nsXFormsDelegateStub::GetValue(aValue);
}
NS_IMETHODIMP
nsXFormsOutputElement::SetValue(const nsAString& aValue)
{
// Setting the value on an output controls seems wrong semantically.
return NS_ERROR_NOT_AVAILABLE;
}
PRBool
nsXFormsOutputElement::IsContentAllowed()
{
PRBool isAllowed = PR_TRUE;
// Output may not be bound to complexContent.
PRBool isComplex = IsContentComplex();
if (isComplex) {
isAllowed = PR_FALSE;
}
return isAllowed;
}
NS_HIDDEN_(nsresult)
NS_NewXFormsOutputElement(nsIXTFElement **aResult)
{
*aResult = new nsXFormsOutputElement();
if (!*aResult)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(*aResult);
return NS_OK;
}