Refactor LinkStyle out of HTMLLinkElement

third_party/WebKit/Source/core/html/LinkStyle.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef LinkStyle_h
+#define LinkStyle_h
+
+#include "core/dom/Node.h"
+#include "core/dom/StyleEngine.h"
+#include "core/fetch/ResourceOwner.h"
+#include "core/fetch/StyleSheetResource.h"
+#include "core/fetch/StyleSheetResourceClient.h"
+#include "core/html/LinkResource.h"
+
+namespace blink {
+
+class HTMLLinkElement;
+//
+// LinkStyle handles dynamically change-able link resources, which is
+// typically @rel="stylesheet".
+//
+// It could be @rel="shortcut icon" or something else though. Each of
+// types might better be handled by a separate class, but dynamically
+// changing @rel makes it harder to move such a design so we are
+// sticking current way so far.
+//
+class LinkStyle final : public LinkResource, ResourceOwner<StyleSheetResource> {
+  USING_GARBAGE_COLLECTED_MIXIN(LinkStyle);
+
+ public:
+  static LinkStyle* create(HTMLLinkElement* owner);
+
+  explicit LinkStyle(HTMLLinkElement* owner);
+  ~LinkStyle() override;
+
+  LinkResourceType type() const override { return Style; }
+  void process() override;
+  void ownerRemoved() override;
+  bool hasLoaded() const override { return m_loadedSheet; }
+  DECLARE_VIRTUAL_TRACE();
+
+  void startLoadingDynamicSheet();
+  void notifyLoadedSheetAndAllCriticalSubresources(
+      Node::LoadedSheetErrorStatus);
+  bool sheetLoaded();
+
+  void setDisabledState(bool);
+  void setSheetTitle(
+      const String&,
+      StyleEngine::ActiveSheetsUpdate = StyleEngine::DontUpdateActiveSheets);
+
+  bool styleSheetIsLoading() const;
+  bool hasSheet() const { return m_sheet; }
+  bool isDisabled() const { return m_disabledState == Disabled; }
+  bool isEnabledViaScript() const {
+    return m_disabledState == EnabledViaScript;
+  }
+  bool isUnset() const { return m_disabledState == Unset; }
+
+  CSSStyleSheet* sheet() const { return m_sheet.get(); }
+
+ private:
+  // From StyleSheetResourceClient
+  void setCSSStyleSheet(const String& href,
+                        const KURL& baseURL,
+                        const String& charset,
+                        const CSSStyleSheetResource*) override;
+  String debugName() const override { return "LinkStyle"; }
+
+  enum DisabledState { Unset, EnabledViaScript, Disabled };
+
+  enum PendingSheetType { None, NonBlocking, Blocking };
+
+  void clearSheet();
+  void addPendingSheet(PendingSheetType);
+  void removePendingSheet();
+  Document& document();
+
+  void setCrossOriginStylesheetStatus(CSSStyleSheet*);
+  void setFetchFollowingCORS() {
+    DCHECK(!m_fetchFollowingCORS);
+    m_fetchFollowingCORS = true;
+  }
+  void clearFetchFollowingCORS() { m_fetchFollowingCORS = false; }
+
+  Member<CSSStyleSheet> m_sheet;
+  DisabledState m_disabledState;
+  PendingSheetType m_pendingSheetType;
+  StyleEngineContext m_styleEngineContext;
+  bool m_loading;
+  bool m_firedLoad;
+  bool m_loadedSheet;
+  bool m_fetchFollowingCORS;
+};
+
+}  // namespace blink
+
+#endif