1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 *
3 * This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6
7 /*
8
9 A package of routines shared by the XUL content code.
10
11 */
12
13 #include "mozilla/ArrayUtils.h"
14
15 #include "nsCollationCID.h"
16 #include "nsCOMPtr.h"
17 #include "nsIContent.h"
18 #include "nsICollation.h"
19 #include "nsIDocument.h"
20 #include "nsIDOMElement.h"
21 #include "nsIDOMXULCommandDispatcher.h"
22 #include "nsIRDFService.h"
23 #include "nsIServiceManager.h"
24 #include "nsXULContentUtils.h"
25 #include "nsLayoutCID.h"
26 #include "nsRDFCID.h"
27 #include "nsString.h"
28 #include "nsGkAtoms.h"
29 #include "XULDocument.h"
30
31 using namespace mozilla;
32 using dom::XULDocument;
33
34 //------------------------------------------------------------------------
35
36 nsIRDFService* nsXULContentUtils::gRDF;
37 nsICollation* nsXULContentUtils::gCollation;
38
39 //------------------------------------------------------------------------
40 // Constructors n' stuff
41 //
42
Init()43 nsresult nsXULContentUtils::Init() {
44 static NS_DEFINE_CID(kRDFServiceCID, NS_RDFSERVICE_CID);
45 nsresult rv = CallGetService(kRDFServiceCID, &gRDF);
46 if (NS_FAILED(rv)) {
47 return rv;
48 }
49
50 return NS_OK;
51 }
52
Finish()53 nsresult nsXULContentUtils::Finish() {
54 NS_IF_RELEASE(gRDF);
55 NS_IF_RELEASE(gCollation);
56
57 return NS_OK;
58 }
59
GetCollation()60 nsICollation* nsXULContentUtils::GetCollation() {
61 if (!gCollation) {
62 nsCOMPtr<nsICollationFactory> colFactory =
63 do_CreateInstance(NS_COLLATIONFACTORY_CONTRACTID);
64 if (colFactory) {
65 DebugOnly<nsresult> rv = colFactory->CreateCollation(&gCollation);
66 NS_ASSERTION(NS_SUCCEEDED(rv), "couldn't create collation instance");
67 } else
68 NS_ERROR("couldn't create instance of collation factory");
69 }
70
71 return gCollation;
72 }
73
74 //------------------------------------------------------------------------
75 //
76
FindChildByTag(nsIContent * aElement,int32_t aNameSpaceID,nsAtom * aTag,Element ** aResult)77 nsresult nsXULContentUtils::FindChildByTag(nsIContent* aElement,
78 int32_t aNameSpaceID, nsAtom* aTag,
79 Element** aResult) {
80 for (nsIContent* child = aElement->GetFirstChild(); child;
81 child = child->GetNextSibling()) {
82 if (child->IsElement() && child->NodeInfo()->Equals(aTag, aNameSpaceID)) {
83 NS_ADDREF(*aResult = child->AsElement());
84 return NS_OK;
85 }
86 }
87
88 *aResult = nullptr;
89 return NS_RDF_NO_VALUE; // not found
90 }
91
SetCommandUpdater(nsIDocument * aDocument,Element * aElement)92 nsresult nsXULContentUtils::SetCommandUpdater(nsIDocument* aDocument,
93 Element* aElement) {
94 // Deal with setting up a 'commandupdater'. Pulls the 'events' and
95 // 'targets' attributes off of aElement, and adds it to the
96 // document's command dispatcher.
97 NS_PRECONDITION(aDocument != nullptr, "null ptr");
98 if (!aDocument) return NS_ERROR_NULL_POINTER;
99
100 NS_PRECONDITION(aElement != nullptr, "null ptr");
101 if (!aElement) return NS_ERROR_NULL_POINTER;
102
103 nsresult rv;
104
105 XULDocument* xuldoc = aDocument->AsXULDocument();
106 NS_ASSERTION(xuldoc != nullptr, "not a xul document");
107 if (!xuldoc) return NS_ERROR_UNEXPECTED;
108
109 nsCOMPtr<nsIDOMXULCommandDispatcher> dispatcher =
110 xuldoc->GetCommandDispatcher();
111 NS_ASSERTION(dispatcher != nullptr, "no dispatcher");
112 if (!dispatcher) return NS_ERROR_UNEXPECTED;
113
114 nsAutoString events;
115 aElement->GetAttr(kNameSpaceID_None, nsGkAtoms::events, events);
116 if (events.IsEmpty()) events.Assign('*');
117
118 nsAutoString targets;
119 aElement->GetAttr(kNameSpaceID_None, nsGkAtoms::targets, targets);
120
121 if (targets.IsEmpty()) targets.Assign('*');
122
123 nsCOMPtr<nsIDOMElement> domelement = do_QueryInterface(aElement);
124 NS_ASSERTION(domelement != nullptr, "not a DOM element");
125 if (!domelement) return NS_ERROR_UNEXPECTED;
126
127 rv = dispatcher->AddCommandUpdater(domelement, events, targets);
128 if (NS_FAILED(rv)) return rv;
129
130 return NS_OK;
131 }
132