зеркало из https://github.com/mozilla/pjs.git
427 строки
13 KiB
C++
427 строки
13 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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* IBM Corporation.
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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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* Brian Ryner <bryner@brianryner.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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/**
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* Implementation of the XForms \<label\> element.
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*/
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#include "nsXFormsUtils.h"
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#include "nsXFormsControlStub.h"
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#include "nsXFormsDelegateStub.h"
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#include "nsXFormsAtoms.h"
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#include "nsCOMPtr.h"
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#include "nsIDOMElement.h"
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#include "nsIDOMXPathResult.h"
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#include "nsIDOM3Node.h"
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#include "nsIDOMDocument.h"
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#include "nsIDOMText.h"
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#include "nsIXTFXMLVisualWrapper.h"
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#include "nsString.h"
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#include "nsIXFormsUIWidget.h"
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#include "nsIDocument.h"
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#include "nsNetUtil.h"
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#include "nsIXFormsLabelElement.h"
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#include "nsIXFormsItemElement.h"
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class nsXFormsLabelElement : public nsXFormsDelegateStub,
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public nsIStreamListener,
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public nsIInterfaceRequestor,
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public nsIXFormsLabelElement
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{
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public:
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NS_DECL_ISUPPORTS_INHERITED
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NS_DECL_NSIREQUESTOBSERVER
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NS_DECL_NSISTREAMLISTENER
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NS_DECL_NSIINTERFACEREQUESTOR
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NS_DECL_NSIXFORMSLABELELEMENT
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// nsIXFormsDelegate
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NS_IMETHOD GetValue(nsAString& aValue);
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// nsIXFormsControl
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NS_IMETHOD IsEventTarget(PRBool *aOK);
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NS_IMETHOD Refresh();
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NS_IMETHOD OnCreated(nsIXTFBindableElementWrapper *aWrapper);
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NS_IMETHOD OnDestroyed();
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// nsIXTFElement overrides
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NS_IMETHOD ChildInserted(nsIDOMNode *aChild, PRUint32 aIndex);
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NS_IMETHOD ChildAppended(nsIDOMNode *aChild);
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NS_IMETHOD ChildRemoved(PRUint32 aIndex);
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NS_IMETHOD AttributeSet(nsIAtom *aName, const nsAString &aSrc);
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NS_IMETHOD AttributeRemoved(nsIAtom *aName);
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#ifdef DEBUG_smaug
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virtual const char* Name() { return "label"; }
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#endif
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private:
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NS_HIDDEN_(void) LoadExternalLabel(const nsAString& aValue);
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nsCString mSrcAttrText;
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nsCOMPtr<nsIChannel> mChannel;
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};
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NS_IMPL_ISUPPORTS_INHERITED4(nsXFormsLabelElement,
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nsXFormsDelegateStub,
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nsIRequestObserver,
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nsIStreamListener,
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nsIInterfaceRequestor,
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nsIXFormsLabelElement)
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NS_IMETHODIMP
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nsXFormsLabelElement::OnCreated(nsIXTFBindableElementWrapper *aWrapper)
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{
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nsresult rv = nsXFormsDelegateStub::OnCreated(aWrapper);
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NS_ENSURE_SUCCESS(rv, rv);
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aWrapper->SetNotificationMask(kStandardNotificationMask |
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nsIXTFElement::NOTIFY_CHILD_INSERTED |
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nsIXTFElement::NOTIFY_CHILD_APPENDED |
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nsIXTFElement::NOTIFY_CHILD_REMOVED);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsXFormsLabelElement::OnDestroyed()
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{
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if (mChannel) {
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// better be a good citizen and tell the browser that we don't need this
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// resource anymore.
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mChannel->Cancel(NS_BINDING_ABORTED);
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mChannel = nsnull;
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}
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return nsXFormsDelegateStub::OnDestroyed();
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}
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NS_IMETHODIMP
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nsXFormsLabelElement::ChildInserted(nsIDOMNode *aChild, PRUint32 aIndex)
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{
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Refresh();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsXFormsLabelElement::ChildAppended(nsIDOMNode *aChild)
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{
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Refresh();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsXFormsLabelElement::ChildRemoved(PRUint32 aIndex)
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{
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Refresh();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsXFormsLabelElement::AttributeSet(nsIAtom *aName, const nsAString &aValue)
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{
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if (aName == nsXFormsAtoms::src) {
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// If we are currently trying to load an external label, cancel the request.
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if (mChannel) {
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mChannel->Cancel(NS_BINDING_ABORTED);
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}
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LoadExternalLabel(aValue);
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// No need to call Refresh() here, since it is called once the link
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// target has been read in, during OnStopRequest()
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return NS_OK;
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}
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return nsXFormsDelegateStub::AttributeSet(aName, aValue);
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}
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NS_IMETHODIMP
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nsXFormsLabelElement::AttributeRemoved(nsIAtom *aName)
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{
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if (aName == nsXFormsAtoms::src) {
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// If we are currently trying to load an external label, cancel the request.
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if (mChannel) {
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mChannel->Cancel(NS_BINDING_ABORTED);
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}
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mSrcAttrText.Truncate();
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Refresh();
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return NS_OK;
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}
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return nsXFormsDelegateStub::AttributeRemoved(aName);
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}
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NS_IMETHODIMP
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nsXFormsLabelElement::GetValue(nsAString& aValue)
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{
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// The order of precedence for determining the label is:
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// single node binding, linking, inline text (8.3.3)
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nsXFormsDelegateStub::GetValue(aValue);
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if (aValue.IsVoid() && !mSrcAttrText.IsEmpty()) {
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// handle linking ('src') attribute
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aValue = NS_ConvertUTF8toUTF16(mSrcAttrText);
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}
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return NS_OK;
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}
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void
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nsXFormsLabelElement::LoadExternalLabel(const nsAString& aSrc)
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{
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nsresult rv = NS_ERROR_FAILURE;
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nsCOMPtr<nsIDOMDocument> domDoc;
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mElement->GetOwnerDocument(getter_AddRefs(domDoc));
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nsCOMPtr<nsIDocument> doc(do_QueryInterface(domDoc));
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if (doc) {
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nsCOMPtr<nsIURI> uri;
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NS_NewURI(getter_AddRefs(uri), aSrc, doc->GetDocumentCharacterSet().get(),
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doc->GetDocumentURI());
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if (uri) {
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if (nsXFormsUtils::CheckSameOrigin(doc->GetDocumentURI(), uri)) {
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nsCOMPtr<nsILoadGroup> loadGroup;
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loadGroup = doc->GetDocumentLoadGroup();
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NS_WARN_IF_FALSE(loadGroup, "No load group!");
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// Using the same load group as the main document and creating
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// the channel with LOAD_NORMAL flag delays the dispatching of
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// the 'load' event until label data document has been loaded.
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NS_NewChannel(getter_AddRefs(mChannel), uri, nsnull, loadGroup,
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this, nsIRequest::LOAD_NORMAL);
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if (mChannel) {
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rv = mChannel->AsyncOpen(this, nsnull);
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if (NS_FAILED(rv)) {
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// URI doesn't exist; report error.
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mChannel = nsnull;
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// XXX Passing |mElement| as |aContext| param to ReportError leads
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// to an infinite loop. Avoid for now.
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const nsPromiseFlatString& flat = PromiseFlatString(aSrc);
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const PRUnichar *strings[] = { flat.get() };
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nsXFormsUtils::ReportError(NS_LITERAL_STRING("labelLink1Error"),
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strings, 1, mElement, nsnull);
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nsCOMPtr<nsIModelElementPrivate> modelPriv =
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nsXFormsUtils::GetModel(mElement);
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nsCOMPtr<nsIDOMNode> model = do_QueryInterface(modelPriv);
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nsXFormsUtils::DispatchEvent(model, eEvent_LinkError);
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}
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}
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} else {
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nsXFormsUtils::ReportError(NS_LITERAL_STRING("labelLinkLoadOrigin"),
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domDoc);
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}
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}
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}
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}
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// nsIXFormsControl
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NS_IMETHODIMP
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nsXFormsLabelElement::Refresh()
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{
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nsXFormsDelegateStub::Refresh();
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nsCOMPtr<nsIDOMNode> parent;
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mElement->GetParentNode(getter_AddRefs(parent));
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// If <label> is inside <select1> its parent is <item>
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// or <contextcontainer> (which parent is <item>).
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nsCOMPtr<nsIXFormsItemElement> item(do_QueryInterface(parent));
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if (item) {
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item->LabelRefreshed();
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} else if (parent) {
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nsCOMPtr<nsIDOMNode> grandparent;
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parent->GetParentNode(getter_AddRefs(grandparent));
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item = do_QueryInterface(grandparent);
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if (item) {
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item->LabelRefreshed();
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}
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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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nsXFormsLabelElement::IsEventTarget(PRBool *aOK)
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{
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*aOK = PR_FALSE;
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return NS_OK;
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}
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// nsIInterfaceRequestor
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NS_IMETHODIMP
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nsXFormsLabelElement::GetInterface(const nsIID &aIID, void **aResult)
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{
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*aResult = nsnull;
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return QueryInterface(aIID, aResult);
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}
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// nsIStreamListener
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// It is possible that the label element could well on its way to invalid by
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// the time that the below handlers are called. If the document hit a
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// parsing error after we've already started to load the external source, then
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// Mozilla will destroy all of the elements and the document in order to load
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// the parser error page. This will cause mElement to become null but since
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// the channel will hold a nsCOMPtr to the nsXFormsLabelElement preventing
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// it from being freed up, the channel will still be able to call the
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// nsIStreamListener functions that we implement here. And calling
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// mChannel->Cancel() is no guarantee that these other notifications won't come
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// through if the timing is wrong. So we need to check for mElement below
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// before we handle any of the stream notifications.
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NS_IMETHODIMP
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nsXFormsLabelElement::OnStartRequest(nsIRequest *aRequest,
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nsISupports *aContext)
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{
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if (!mElement) {
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return NS_OK;
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}
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// Only handle data from text files for now. Cancel any other requests.
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nsCOMPtr<nsIChannel> channel(do_QueryInterface(aRequest));
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if (channel) {
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nsCAutoString type;
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channel->GetContentType(type);
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if (!type.EqualsLiteral("text/plain"))
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return NS_ERROR_ILLEGAL_VALUE;
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}
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mSrcAttrText.Truncate();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsXFormsLabelElement::OnDataAvailable(nsIRequest *aRequest,
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nsISupports *aContext,
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nsIInputStream *aInputStream,
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PRUint32 aOffset,
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PRUint32 aCount)
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{
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if (!mElement) {
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return NS_OK;
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}
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nsresult rv;
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PRUint32 size, bytesRead;
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char buffer[256];
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while (aCount) {
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size = PR_MIN(aCount, sizeof(buffer));
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rv = aInputStream->Read(buffer, size, &bytesRead);
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if (NS_FAILED(rv))
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return rv;
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mSrcAttrText.Append(buffer, bytesRead);
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aCount -= bytesRead;
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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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nsXFormsLabelElement::OnStopRequest(nsIRequest *aRequest,
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nsISupports *aContext,
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nsresult aStatusCode)
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{
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// Done with load request, so null out channel member
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mChannel = nsnull;
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if (!mElement) {
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return NS_OK;
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}
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if (NS_FAILED(aStatusCode)) {
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// If we received NS_BINDING_ABORTED, then we were cancelled by a later
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// AttributeSet() or AttributeRemoved call. Don't do anything and return.
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if (aStatusCode == NS_BINDING_ABORTED)
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return NS_OK;
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// XXX Passing |mElement| as |aContext| param to ReportError leads
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// to an infinite loop. Avoid for now.
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nsAutoString src;
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mElement->GetAttribute(NS_LITERAL_STRING("src"), src);
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const PRUnichar *strings[] = { src.get() };
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nsXFormsUtils::ReportError(NS_LITERAL_STRING("labelLink2Error"),
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strings, 1, mElement, nsnull);
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nsCOMPtr<nsIModelElementPrivate> modelPriv =
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nsXFormsUtils::GetModel(mElement);
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nsCOMPtr<nsIDOMNode> model = do_QueryInterface(modelPriv);
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nsXFormsUtils::DispatchEvent(model, eEvent_LinkError);
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mSrcAttrText.Truncate();
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}
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nsCOMPtr<nsIXFormsUIWidget> widget = do_QueryInterface(mElement);
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if (widget)
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widget->Refresh();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsXFormsLabelElement::GetTextValue(nsAString& aValue)
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{
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NS_ENSURE_STATE(mElement);
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GetValue(aValue);
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if (aValue.IsVoid()) {
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nsCOMPtr<nsIDOM3Node> inner(do_QueryInterface(mElement));
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if (inner) {
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inner->GetTextContent(aValue);
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}
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}
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return NS_OK;
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}
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NS_HIDDEN_(nsresult)
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NS_NewXFormsLabelElement(nsIXTFElement **aResult)
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{
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*aResult = new nsXFormsLabelElement();
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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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