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1 : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 : /* vim: set ts=8 sts=2 et sw=2 tw=80: */
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 : * A base class which implements nsIStyleSheetLinkingElement and can
9 : * be subclassed by various content nodes that want to load
10 : * stylesheets (<style>, <link>, processing instructions, etc).
11 : */
12 :
13 : #ifndef nsStyleLinkElement_h___
14 : #define nsStyleLinkElement_h___
15 :
16 : #include "mozilla/Attributes.h"
17 : #include "mozilla/CORSMode.h"
18 : #include "mozilla/StyleSheetInlines.h"
19 : #include "mozilla/net/ReferrerPolicy.h"
20 : #include "nsCOMPtr.h"
21 : #include "nsIStyleSheetLinkingElement.h"
22 : #include "nsTArray.h"
23 : #include "nsAttrValue.h"
24 :
25 : class nsIDocument;
26 : class nsIURI;
27 :
28 : namespace mozilla {
29 : class CSSStyleSheet;
30 : namespace dom {
31 : class ShadowRoot;
32 : } // namespace dom
33 : } // namespace mozilla
34 :
35 : class nsStyleLinkElement : public nsIStyleSheetLinkingElement
36 : {
37 : public:
38 : nsStyleLinkElement();
39 : virtual ~nsStyleLinkElement();
40 :
41 : NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr) override = 0;
42 :
43 0 : mozilla::StyleSheet* GetSheet() const { return mStyleSheet; }
44 :
45 : // nsIStyleSheetLinkingElement
46 : NS_IMETHOD SetStyleSheet(mozilla::StyleSheet* aStyleSheet) override;
47 : NS_IMETHOD_(mozilla::StyleSheet*) GetStyleSheet() override;
48 : NS_IMETHOD InitStyleLinkElement(bool aDontLoadStyle) override;
49 : NS_IMETHOD UpdateStyleSheet(nsICSSLoaderObserver* aObserver,
50 : bool* aWillNotify,
51 : bool* aIsAlternate,
52 : bool aForceReload) override;
53 : NS_IMETHOD SetEnableUpdates(bool aEnableUpdates) override;
54 : NS_IMETHOD GetCharset(nsAString& aCharset) override;
55 :
56 : virtual void OverrideBaseURI(nsIURI* aNewBaseURI) override;
57 : virtual void SetLineNumber(uint32_t aLineNumber) override;
58 : virtual uint32_t GetLineNumber() override;
59 :
60 : enum RelValue {
61 : ePREFETCH = 0x00000001,
62 : eDNS_PREFETCH = 0x00000002,
63 : eSTYLESHEET = 0x00000004,
64 : eNEXT = 0x00000008,
65 : eALTERNATE = 0x00000010,
66 : ePRECONNECT = 0x00000020,
67 : ePRERENDER = 0x00000040,
68 : ePRELOAD = 0x00000080
69 : };
70 :
71 : // The return value is a bitwise or of 0 or more RelValues.
72 : static uint32_t ParseLinkTypes(const nsAString& aTypes);
73 :
74 : static bool CheckPreloadAttrs(const nsAttrValue& aAs, const nsAString& aType,
75 : const nsAString& aMedia, nsIDocument* aDocument);
76 :
77 11 : void UpdateStyleSheetInternal()
78 : {
79 11 : UpdateStyleSheetInternal(nullptr, nullptr);
80 11 : }
81 : protected:
82 : /**
83 : * @param aOldDocument should be non-null only if we're updating because we
84 : * removed the node from the document.
85 : * @param aForceUpdate true will force the update even if the URI has not
86 : * changed. This should be used in cases when something
87 : * about the content that affects the resulting sheet
88 : * changed but the URI may not have changed.
89 : */
90 : nsresult UpdateStyleSheetInternal(nsIDocument *aOldDocument,
91 : mozilla::dom::ShadowRoot *aOldShadowRoot,
92 : bool aForceUpdate = false);
93 :
94 : void UpdateStyleSheetScopedness(bool aIsNowScoped);
95 :
96 : virtual already_AddRefed<nsIURI> GetStyleSheetURL(bool* aIsInline) = 0;
97 : virtual void GetStyleSheetInfo(nsAString& aTitle,
98 : nsAString& aType,
99 : nsAString& aMedia,
100 : bool* aIsScoped,
101 : bool* aIsAlternate) = 0;
102 :
103 6 : virtual mozilla::CORSMode GetCORSMode() const
104 : {
105 : // Default to no CORS
106 6 : return mozilla::CORS_NONE;
107 : }
108 :
109 6 : virtual mozilla::net::ReferrerPolicy GetLinkReferrerPolicy()
110 : {
111 6 : return mozilla::net::RP_Unset;
112 : }
113 :
114 : // CC methods
115 : void Unlink();
116 : void Traverse(nsCycleCollectionTraversalCallback &cb);
117 :
118 : private:
119 : /**
120 : * @param aOldDocument should be non-null only if we're updating because we
121 : * removed the node from the document.
122 : * @param aOldShadowRoot The ShadowRoot that used to contain the style.
123 : * Passed as a parameter because on an update, the node
124 : * is removed from the tree before the sheet is removed
125 : * from the ShadowRoot.
126 : * @param aForceUpdate true will force the update even if the URI has not
127 : * changed. This should be used in cases when something
128 : * about the content that affects the resulting sheet
129 : * changed but the URI may not have changed.
130 : */
131 : nsresult DoUpdateStyleSheet(nsIDocument* aOldDocument,
132 : mozilla::dom::ShadowRoot* aOldShadowRoot,
133 : nsICSSLoaderObserver* aObserver,
134 : bool* aWillNotify,
135 : bool* aIsAlternate,
136 : bool aForceUpdate);
137 :
138 : RefPtr<mozilla::StyleSheet> mStyleSheet;
139 : protected:
140 : bool mDontLoadStyle;
141 : bool mUpdatesEnabled;
142 : uint32_t mLineNumber;
143 : };
144 :
145 : #endif /* nsStyleLinkElement_h___ */
146 :
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