import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

dom/base/nsStyleLinkElement.h

@@ -0,0 +1,146 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 base class which implements nsIStyleSheetLinkingElement and can
+ * be subclassed by various content nodes that want to load
+ * stylesheets (<style>, <link>, processing instructions, etc).
+ */
+
+#ifndef nsStyleLinkElement_h___
+#define nsStyleLinkElement_h___
+
+#include "mozilla/Attributes.h"
+#include "mozilla/CORSMode.h"
+#include "mozilla/StyleSheetInlines.h"
+#include "mozilla/net/ReferrerPolicy.h"
+#include "nsCOMPtr.h"
+#include "nsIStyleSheetLinkingElement.h"
+#include "nsTArray.h"
+
+class nsIDocument;
+class nsIURI;
+
+namespace mozilla {
+class CSSStyleSheet;
+namespace dom {
+class ShadowRoot;
+} // namespace dom
+} // namespace mozilla
+
+class nsStyleLinkElement : public nsIStyleSheetLinkingElement
+{
+public:
+  nsStyleLinkElement();
+  virtual ~nsStyleLinkElement();
+
+  NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr) override = 0;
+
+  mozilla::StyleSheet* GetSheet() const { return mStyleSheet; }
+
+  // nsIStyleSheetLinkingElement  
+  NS_IMETHOD SetStyleSheet(mozilla::StyleSheet* aStyleSheet) override;
+  NS_IMETHOD_(mozilla::StyleSheet*) GetStyleSheet() override;
+  NS_IMETHOD InitStyleLinkElement(bool aDontLoadStyle) override;
+  NS_IMETHOD UpdateStyleSheet(nsICSSLoaderObserver* aObserver,
+                              bool* aWillNotify,
+                              bool* aIsAlternate,
+                              bool aForceReload) override;
+  NS_IMETHOD SetEnableUpdates(bool aEnableUpdates) override;
+  NS_IMETHOD GetCharset(nsAString& aCharset) override;
+
+  virtual void OverrideBaseURI(nsIURI* aNewBaseURI) override;
+  virtual void SetLineNumber(uint32_t aLineNumber) override;
+  virtual uint32_t GetLineNumber() override;
+
+  enum RelValue {
+    ePREFETCH =     0x00000001,
+    eDNS_PREFETCH = 0x00000002,
+    eSTYLESHEET =   0x00000004,
+    eNEXT =         0x00000008,
+    eALTERNATE =    0x00000010,
+    eHTMLIMPORT =   0x00000020,
+    ePRECONNECT =   0x00000040
+  };
+
+  // The return value is a bitwise or of 0 or more RelValues.
+  // aPrincipal is used to check if HTML imports is enabled for the
+  // provided principal.
+  static uint32_t ParseLinkTypes(const nsAString& aTypes,
+                                 nsIPrincipal* aPrincipal);
+
+  static bool IsImportEnabled();
+  
+  void UpdateStyleSheetInternal()
+  {
+    UpdateStyleSheetInternal(nullptr, nullptr);
+  }
+protected:
+  /**
+   * @param aOldDocument should be non-null only if we're updating because we
+   *                     removed the node from the document.
+   * @param aForceUpdate true will force the update even if the URI has not
+   *                     changed.  This should be used in cases when something
+   *                     about the content that affects the resulting sheet
+   *                     changed but the URI may not have changed.
+   */
+  nsresult UpdateStyleSheetInternal(nsIDocument *aOldDocument,
+                                    mozilla::dom::ShadowRoot *aOldShadowRoot,
+                                    bool aForceUpdate = false);
+
+  void UpdateStyleSheetScopedness(bool aIsNowScoped);
+
+  virtual already_AddRefed<nsIURI> GetStyleSheetURL(bool* aIsInline) = 0;
+  virtual void GetStyleSheetInfo(nsAString& aTitle,
+                                 nsAString& aType,
+                                 nsAString& aMedia,
+                                 bool* aIsScoped,
+                                 bool* aIsAlternate) = 0;
+
+  virtual mozilla::CORSMode GetCORSMode() const
+  {
+    // Default to no CORS
+    return mozilla::CORS_NONE;
+  }
+
+  virtual mozilla::net::ReferrerPolicy GetLinkReferrerPolicy()
+  {
+    return mozilla::net::RP_Unset;
+  }
+
+  // CC methods
+  void Unlink();
+  void Traverse(nsCycleCollectionTraversalCallback &cb);
+
+private:
+  /**
+   * @param aOldDocument should be non-null only if we're updating because we
+   *                     removed the node from the document.
+   * @param aOldShadowRoot The ShadowRoot that used to contain the style.
+   *                     Passed as a parameter because on an update, the node
+   *                     is removed from the tree before the sheet is removed
+   *                     from the ShadowRoot.
+   * @param aForceUpdate true will force the update even if the URI has not
+   *                     changed.  This should be used in cases when something
+   *                     about the content that affects the resulting sheet
+   *                     changed but the URI may not have changed.
+   */
+  nsresult DoUpdateStyleSheet(nsIDocument* aOldDocument,
+                              mozilla::dom::ShadowRoot* aOldShadowRoot,
+                              nsICSSLoaderObserver* aObserver,
+                              bool* aWillNotify,
+                              bool* aIsAlternate,
+                              bool aForceUpdate);
+
+  RefPtr<mozilla::StyleSheet> mStyleSheet;
+protected:
+  bool mDontLoadStyle;
+  bool mUpdatesEnabled;
+  uint32_t mLineNumber;
+};
+
+#endif /* nsStyleLinkElement_h___ */
+