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gecko-dev/extensions/xforms/nsXFormsOutputElement.cpp

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8.5 KiB
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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>
*
* 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 "nsXFormsStubElement.h"
#include "nsIXTFXMLVisualWrapper.h"
#include "nsAutoPtr.h"
#include "nsCOMPtr.h"
#include "nsMemory.h"
#include "nsString.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 "nsIXFormsControl.h"
#include "nsXFormsAtoms.h"
#include "nsXFormsUtils.h"
/**
* Implementation of the XForms \<output\> element.
*
* @see http://www.w3.org/TR/xforms/slice8.html#ui-output
*/
class nsXFormsOutputElement : public nsXFormsXMLVisualStub,
public nsIXFormsControl
{
public:
NS_DECL_ISUPPORTS_INHERITED
// nsIXTFXMLVisual overrides
NS_IMETHOD OnCreated(nsIXTFXMLVisualWrapper *aWrapper);
// nsIXTFVisual overrides
NS_IMETHOD GetVisualContent(nsIDOMElement **aElement);
NS_IMETHOD GetInsertionPoint(nsIDOMElement **aElement);
// nsIXTFElement overrides
NS_IMETHOD OnDestroyed();
NS_IMETHOD DocumentChanged(nsIDOMDocument *aNewDocument);
NS_IMETHOD ParentChanged(nsIDOMElement *aNewParent);
NS_IMETHOD WillSetAttribute(nsIAtom *aName, const nsAString &aValue);
NS_IMETHOD AttributeSet(nsIAtom *aName, const nsAString &aValue);
// nsIXFormsControl
NS_DECL_NSIXFORMSCONTROL
nsXFormsOutputElement() : mElement(nsnull) {}
private:
nsCOMPtr<nsIDOMElement> mHTMLElement;
nsIDOMElement *mElement;
};
NS_IMPL_ISUPPORTS_INHERITED1(nsXFormsOutputElement,
nsXFormsXMLVisualStub,
nsIXFormsControl)
// nsIXTFXMLVisual
NS_IMETHODIMP
nsXFormsOutputElement::OnCreated(nsIXTFXMLVisualWrapper *aWrapper)
{
#ifdef DEBUG_XF_OUTPUT
printf("nsXFormsOutputElement::OnCreated()\n");
#endif
aWrapper->SetNotificationMask(nsIXTFElement::NOTIFY_WILL_SET_ATTRIBUTE |
nsIXTFElement::NOTIFY_ATTRIBUTE_SET |
nsIXTFElement::NOTIFY_DOCUMENT_CHANGED |
nsIXTFElement::NOTIFY_PARENT_CHANGED);
nsresult rv;
nsCOMPtr<nsIDOMElement> node;
rv = aWrapper->GetElementNode(getter_AddRefs(node));
NS_ENSURE_SUCCESS(rv, rv);
// It's ok to keep a weak pointer to mElement. mElement will have an
// owning reference to this object, so as long as we null out mElement in
// OnDestroyed, it will always be valid.
mElement = node;
NS_ASSERTION(mElement, "Wrapper is not an nsIDOMElement, we'll crash soon");
nsCOMPtr<nsIDOMDocument> domDoc;
rv = node->GetOwnerDocument(getter_AddRefs(domDoc));
NS_ENSURE_SUCCESS(rv, rv);
rv = domDoc->CreateElementNS(NS_LITERAL_STRING(NS_NAMESPACE_XHTML),
NS_LITERAL_STRING("span"),
getter_AddRefs(mHTMLElement));
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
// nsIXTFVisual
NS_IMETHODIMP
nsXFormsOutputElement::GetVisualContent(nsIDOMElement **aElement)
{
NS_IF_ADDREF(*aElement = mHTMLElement);
return NS_OK;
}
NS_IMETHODIMP
nsXFormsOutputElement::GetInsertionPoint(nsIDOMElement **aElement)
{
NS_IF_ADDREF(*aElement = mHTMLElement);
return NS_OK;
}
// nsIXTFElement
NS_IMETHODIMP
nsXFormsOutputElement::OnDestroyed()
{
mElement = nsnull;
mHTMLElement = nsnull;
return NS_OK;
}
NS_IMETHODIMP
nsXFormsOutputElement::DocumentChanged(nsIDOMDocument *aNewDocument)
{
// We need to re-evaluate our instance data binding when our document
// changes, since our context can change
if (aNewDocument)
Refresh();
return NS_OK;
}
NS_IMETHODIMP
nsXFormsOutputElement::ParentChanged(nsIDOMElement *aNewParent)
{
// We need to re-evaluate our instance data binding when our parent changes,
// since xmlns declarations or our context could have changed.
if (aNewParent) {
Refresh();
}
return NS_OK;
}
NS_IMETHODIMP
nsXFormsOutputElement::WillSetAttribute(nsIAtom *aName, const nsAString &aValue)
{
if (aName == nsXFormsAtoms::bind || aName == nsXFormsAtoms::ref) {
nsCOMPtr<nsIDOMNode> modelNode = nsXFormsUtils::GetModel(mElement);
nsCOMPtr<nsIModelElementPrivate> model = do_QueryInterface(modelNode);
if (model)
model->RemoveFormControl(this);
}
return NS_OK;
}
NS_IMETHODIMP
nsXFormsOutputElement::AttributeSet(nsIAtom *aName, const nsAString &aValue)
{
if (aName == nsXFormsAtoms::bind || aName == nsXFormsAtoms::ref) {
Refresh();
}
return NS_OK;
}
// nsIXFormsControl
NS_IMETHODIMP
nsXFormsOutputElement::Refresh()
{
#ifdef DEBUG_XF_OUTPUT
printf("nsXFormsOutputElement::Refresh()\n");
#endif
if (!mHTMLElement)
return NS_OK;
nsresult rv;
PRBool hasRef;
rv = mElement->HasAttribute(NS_LITERAL_STRING("ref"), &hasRef);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIDOMNode> modelNode;
nsCOMPtr<nsIDOMElement> bindElement;
nsCOMPtr<nsIDOMXPathResult> result;
if (hasRef) {
result = nsXFormsUtils::EvaluateNodeBinding(mElement,
nsXFormsUtils::ELEMENT_WITH_MODEL_ATTR,
NS_LITERAL_STRING("ref"),
EmptyString(),
nsIDOMXPathResult::FIRST_ORDERED_NODE_TYPE,
getter_AddRefs(modelNode),
getter_AddRefs(bindElement));
} else {
result = nsXFormsUtils::EvaluateNodeBinding(mElement,
nsXFormsUtils::ELEMENT_WITH_MODEL_ATTR,
NS_LITERAL_STRING("value"),
EmptyString(),
nsIDOMXPathResult::STRING_TYPE,
getter_AddRefs(modelNode),
getter_AddRefs(bindElement));
}
nsCOMPtr<nsIModelElementPrivate> model = do_QueryInterface(modelNode);
if (model) {
model->AddFormControl(this);
if (result) {
nsAutoString text;
if (hasRef) {
nsCOMPtr<nsIDOMNode> resultNode;
rv = result->GetSingleNodeValue(getter_AddRefs(resultNode));
if (resultNode)
nsXFormsUtils::GetNodeValue(resultNode, text);
} else {
rv = result->GetStringValue(text);
}
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIDOM3Node> dom3Node = do_QueryInterface(mHTMLElement);
NS_ENSURE_STATE(dom3Node);
rv = dom3Node->SetTextContent(text);
NS_ENSURE_SUCCESS(rv, rv);
}
}
return NS_OK;
}
NS_HIDDEN_(nsresult)
NS_NewXFormsOutputElement(nsIXTFElement **aResult)
{
*aResult = new nsXFormsOutputElement();
if (!*aResult)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(*aResult);
return NS_OK;
}
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