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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_HTML_LINK_STYLE_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_HTML_LINK_STYLE_H_
#include "third_party/blink/renderer/core/css/pending_sheet_type.h"
#include "third_party/blink/renderer/core/css/style_engine.h"
#include "third_party/blink/renderer/core/dom/node.h"
#include "third_party/blink/renderer/core/html/link_resource.h"
#include "third_party/blink/renderer/core/loader/resource/css_style_sheet_resource.h"
#include "third_party/blink/renderer/platform/loader/fetch/resource_client.h"
#include "third_party/blink/renderer/platform/wtf/forward.h"
namespace blink {
class HTMLLinkElement;
struct LinkLoadParameters;
// 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, ResourceClient {
public:
explicit LinkStyle(HTMLLinkElement* owner);
~LinkStyle() override;
LinkResourceType GetType() const override { return kStyle; }
void Process(LinkLoadParameters::Reason reason) override;
void OwnerRemoved() override;
bool HasLoaded() const override { return loaded_sheet_; }
void Trace(Visitor*) const override;
void SetToPendingState();
void NotifyLoadedSheetAndAllCriticalSubresources(
Node::LoadedSheetErrorStatus);
bool SheetLoaded();
void SetDisabledState(bool);
void SetSheetTitle(const String&);
bool StyleSheetIsLoading() const;
bool HasSheet() const { return sheet_ != nullptr; }
bool IsDisabled() const { return disabled_state_ == kDisabled; }
bool IsEnabledViaScript() const {
return disabled_state_ == kEnabledViaScript;
}
bool IsUnset() const { return disabled_state_ == kUnset; }
bool IsExplicitlyEnabled() const { return explicitly_enabled_; }
CSSStyleSheet* Sheet() const { return sheet_.Get(); }
void UnblockRenderingForPendingSheet();
private:
// From ResourceClient
void NotifyFinished(Resource*) override;
String DebugName() const override { return "LinkStyle"; }
enum LoadReturnValue { kLoaded, kNotNeeded, kBail };
LoadReturnValue LoadStylesheetIfNeeded(const LinkLoadParameters&,
const WTF::TextEncoding&);
enum DisabledState { kUnset, kEnabledViaScript, kDisabled };
void ClearSheet();
void AddPendingSheet(PendingSheetType);
void RemovePendingSheet();
Member<CSSStyleSheet> sheet_;
DisabledState disabled_state_;
PendingSheetType pending_sheet_type_;
RenderBlockingBehavior render_blocking_behavior_;
bool explicitly_enabled_;
bool loading_;
bool fired_load_;
bool loaded_sheet_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_HTML_LINK_STYLE_H_
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