gecko-dev/dom/xul/nsXULContentUtils.cpp

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4.1 KiB
C++

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
A package of routines shared by the XUL content code.
*/
#include "mozilla/ArrayUtils.h"
#include "nsCollationCID.h"
#include "nsCOMPtr.h"
#include "nsIContent.h"
#include "nsICollation.h"
#include "nsIDocument.h"
#include "nsIDOMElement.h"
#include "nsIDOMXULCommandDispatcher.h"
#include "nsIRDFService.h"
#include "nsIServiceManager.h"
#include "nsXULContentUtils.h"
#include "nsLayoutCID.h"
#include "nsRDFCID.h"
#include "nsString.h"
#include "nsGkAtoms.h"
#include "XULDocument.h"
using namespace mozilla;
using dom::XULDocument;
//------------------------------------------------------------------------
nsIRDFService* nsXULContentUtils::gRDF;
nsICollation *nsXULContentUtils::gCollation;
//------------------------------------------------------------------------
// Constructors n' stuff
//
nsresult
nsXULContentUtils::Init()
{
static NS_DEFINE_CID(kRDFServiceCID, NS_RDFSERVICE_CID);
nsresult rv = CallGetService(kRDFServiceCID, &gRDF);
if (NS_FAILED(rv)) {
return rv;
}
return NS_OK;
}
nsresult
nsXULContentUtils::Finish()
{
NS_IF_RELEASE(gRDF);
NS_IF_RELEASE(gCollation);
return NS_OK;
}
nsICollation*
nsXULContentUtils::GetCollation()
{
if (!gCollation) {
nsCOMPtr<nsICollationFactory> colFactory =
do_CreateInstance(NS_COLLATIONFACTORY_CONTRACTID);
if (colFactory) {
DebugOnly<nsresult> rv = colFactory->CreateCollation(&gCollation);
NS_ASSERTION(NS_SUCCEEDED(rv),
"couldn't create collation instance");
} else
NS_ERROR("couldn't create instance of collation factory");
}
return gCollation;
}
//------------------------------------------------------------------------
//
nsresult
nsXULContentUtils::FindChildByTag(nsIContent* aElement,
int32_t aNameSpaceID,
nsAtom* aTag,
Element** aResult)
{
for (nsIContent* child = aElement->GetFirstChild();
child;
child = child->GetNextSibling()) {
if (child->IsElement() &&
child->NodeInfo()->Equals(aTag, aNameSpaceID)) {
NS_ADDREF(*aResult = child->AsElement());
return NS_OK;
}
}
*aResult = nullptr;
return NS_RDF_NO_VALUE; // not found
}
nsresult
nsXULContentUtils::SetCommandUpdater(nsIDocument* aDocument, Element* aElement)
{
// Deal with setting up a 'commandupdater'. Pulls the 'events' and
// 'targets' attributes off of aElement, and adds it to the
// document's command dispatcher.
NS_PRECONDITION(aDocument != nullptr, "null ptr");
if (! aDocument)
return NS_ERROR_NULL_POINTER;
NS_PRECONDITION(aElement != nullptr, "null ptr");
if (! aElement)
return NS_ERROR_NULL_POINTER;
nsresult rv;
XULDocument* xuldoc = aDocument->AsXULDocument();
NS_ASSERTION(xuldoc != nullptr, "not a xul document");
if (! xuldoc)
return NS_ERROR_UNEXPECTED;
nsCOMPtr<nsIDOMXULCommandDispatcher> dispatcher =
xuldoc->GetCommandDispatcher();
NS_ASSERTION(dispatcher != nullptr, "no dispatcher");
if (! dispatcher)
return NS_ERROR_UNEXPECTED;
nsAutoString events;
aElement->GetAttr(kNameSpaceID_None, nsGkAtoms::events, events);
if (events.IsEmpty())
events.Assign('*');
nsAutoString targets;
aElement->GetAttr(kNameSpaceID_None, nsGkAtoms::targets, targets);
if (targets.IsEmpty())
targets.Assign('*');
nsCOMPtr<nsIDOMElement> domelement = do_QueryInterface(aElement);
NS_ASSERTION(domelement != nullptr, "not a DOM element");
if (! domelement)
return NS_ERROR_UNEXPECTED;
rv = dispatcher->AddCommandUpdater(domelement, events, targets);
if (NS_FAILED(rv)) return rv;
return NS_OK;
}