mirror of
https://github.com/rn10950/RetroZilla.git
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238 lines
6.9 KiB
C++
238 lines
6.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla XForms support.
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*
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* The Initial Developer of the Original Code is
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* Novell, Inc.
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* Portions created by the Initial Developer are Copyright (C) 2004
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Allan Beaufour <abeaufour@novell.com>
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* Olli Pettay <Olli.Pettay@helsinki.fi>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifdef DEBUG
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//#define DEBUG_XF_OUTPUT
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#endif
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#include "nsAutoPtr.h"
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#include "nsCOMPtr.h"
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#include "nsMemory.h"
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#include "nsString.h"
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#include "nsDOMString.h"
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#include "nsIDOM3Node.h"
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#include "nsIDOMDocument.h"
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#include "nsIDOMElement.h"
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#include "nsIDOMEventTarget.h"
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#include "nsIDOMXPathExpression.h"
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#include "nsIDOMXPathResult.h"
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#include "nsISchema.h"
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#include "nsIModelElementPrivate.h"
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#include "nsXFormsDelegateStub.h"
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#include "nsXFormsAtoms.h"
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#include "nsXFormsUtils.h"
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#include "nsIXFormsUIWidget.h"
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#include "nsXFormsModelElement.h"
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/**
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* Implementation of the XForms \<output\> element.
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*
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* \<output\> is not really that different from \<input\>
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* (ie. nsXFormsDelegateStub), except that it has an "value" attribute that
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* must be handled seperately because it is evaluated to a string result.
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*
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* @see http://www.w3.org/TR/xforms/slice8.html#ui-output
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*/
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class nsXFormsOutputElement : public nsXFormsDelegateStub
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{
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public:
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// nsIXFormsControl
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NS_IMETHOD Bind(PRBool* aContextChanged);
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NS_IMETHOD Refresh();
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NS_IMETHOD GetBoundNode(nsIDOMNode **aBoundNode);
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// nsIXFormsDelegate
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NS_IMETHOD GetValue(nsAString& aValue);
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NS_IMETHOD SetValue(const nsAString& aValue);
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NS_IMETHOD GetHasBoundNode(PRBool *aHasBoundNode);
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virtual PRBool IsContentAllowed();
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nsXFormsOutputElement();
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private:
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// The value of the "value" attribute (if any). Updated by Bind()
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nsString mValue;
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// Use the "value" attribute
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PRBool mUseValueAttribute;
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};
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nsXFormsOutputElement::nsXFormsOutputElement()
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: nsXFormsDelegateStub(NS_LITERAL_STRING("output")),
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mUseValueAttribute(PR_FALSE)
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{
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}
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// nsIXFormsControl
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nsresult
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nsXFormsOutputElement::Bind(PRBool *aContextChanged)
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{
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SetDOMStringToNull(mValue);
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mUseValueAttribute = PR_FALSE;
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nsresult rv = nsXFormsDelegateStub::Bind(aContextChanged);
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NS_ENSURE_SUCCESS(rv, rv);
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if (!mHasParent || !mElement || rv == NS_OK_XFORMS_DEFERRED)
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return NS_OK;
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// Besides the standard single node binding (SNB) attributes, \<output\>
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// also has a "value" attribute, which is used when there are not other SNB
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// attributes.
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if (!HasBindingAttribute()) {
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mUseValueAttribute = PR_TRUE;
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} else {
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PRBool hasAttr;
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rv = mElement->HasAttribute(NS_LITERAL_STRING("ref"), &hasAttr);
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NS_ENSURE_SUCCESS(rv, rv);
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if (!hasAttr) {
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rv = mElement->HasAttribute(NS_LITERAL_STRING("bind"), &hasAttr);
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NS_ENSURE_SUCCESS(rv, rv);
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mUseValueAttribute = !hasAttr;
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}
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}
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if (!mUseValueAttribute)
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return NS_OK;
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// Bind to model and set mBoundNode . The bound node is used for setting
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// context for our children (our parent's context in the case of @value),
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// and the call to ProcessNodeBinding() will not set it.
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rv = BindToModel(PR_TRUE);
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NS_ENSURE_SUCCESS(rv, rv);
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// Process node binding
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nsCOMPtr<nsIDOMXPathResult> result;
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rv = ProcessNodeBinding(NS_LITERAL_STRING("value"),
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nsIDOMXPathResult::STRING_TYPE,
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getter_AddRefs(result));
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NS_ENSURE_SUCCESS(rv, rv);
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if (rv == NS_OK_XFORMS_DEFERRED) {
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// Can't leave the output in the model list. Since the xforms processor
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// is still deferring binds any contextcontrol helping to set the context
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// for the output's value expression probably isn't in the control list
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// yet. And if that's the case, we can't have the output in the list
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// before the contextcontrol or the output won't bind right once the
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// deferred binds finallyhappen. If we got mBoundNode in addition to
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// mModel during BindToModel, it isn't likely good, either, so junk it, too.
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mBoundNode = nsnull;
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if (mModel) {
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mModel->RemoveFormControl(this);
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mModel = nsnull;
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}
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return NS_OK;
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}
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if (result) {
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rv = result->GetStringValue(mValue);
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NS_ENSURE_SUCCESS(rv, rv);
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsXFormsOutputElement::Refresh()
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{
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return nsXFormsDelegateStub::Refresh();
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}
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NS_IMETHODIMP
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nsXFormsOutputElement::GetBoundNode(nsIDOMNode **aBoundNode)
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{
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return !mUseValueAttribute ? nsXFormsDelegateStub::GetBoundNode(aBoundNode)
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: NS_OK;
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}
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NS_IMETHODIMP
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nsXFormsOutputElement::GetHasBoundNode(PRBool *aHasBoundNode)
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{
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NS_ENSURE_ARG_POINTER(aHasBoundNode);
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*aHasBoundNode = (mBoundNode && !mUseValueAttribute) ? PR_TRUE : PR_FALSE;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsXFormsOutputElement::GetValue(nsAString& aValue)
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{
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if (mUseValueAttribute) {
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aValue = mValue;
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return NS_OK;
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}
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return nsXFormsDelegateStub::GetValue(aValue);
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}
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NS_IMETHODIMP
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nsXFormsOutputElement::SetValue(const nsAString& aValue)
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{
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// Setting the value on an output controls seems wrong semantically.
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return NS_ERROR_NOT_AVAILABLE;
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}
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PRBool
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nsXFormsOutputElement::IsContentAllowed()
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{
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PRBool isAllowed = PR_TRUE;
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// Output may not be bound to complexContent.
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PRBool isComplex = IsContentComplex();
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if (isComplex) {
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isAllowed = PR_FALSE;
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}
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return isAllowed;
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}
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NS_HIDDEN_(nsresult)
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NS_NewXFormsOutputElement(nsIXTFElement **aResult)
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{
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*aResult = new nsXFormsOutputElement();
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if (!*aResult)
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return NS_ERROR_OUT_OF_MEMORY;
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NS_ADDREF(*aResult);
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return NS_OK;
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}
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