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/*
* Copyright (C) 2012 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_DOM_CONTEXT_FEATURES_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_DOM_CONTEXT_FEATURES_H_
#include <memory>
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/page/page.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
namespace blink {
class ContextFeaturesClient;
class Document;
class Page;
class ContextFeatures final : public GarbageCollected<ContextFeatures>,
public Supplement<Page> {
public:
static const char kSupplementName[];
enum FeatureType {
kPagePopup = 0,
kMutationEvents,
kFeatureTypeSize // Should be the last entry.
};
static ContextFeatures& DefaultSwitch();
static bool PagePopupEnabled(Document*);
static bool MutationEventsEnabled(Document*);
explicit ContextFeatures(std::unique_ptr<ContextFeaturesClient> client)
: client_(std::move(client)) {}
bool IsEnabled(Document*, FeatureType, bool) const;
void UrlDidChange(Document*);
private:
std::unique_ptr<ContextFeaturesClient> client_;
};
class ContextFeaturesClient {
USING_FAST_MALLOC(ContextFeaturesClient);
public:
static std::unique_ptr<ContextFeaturesClient> Empty();
virtual ~ContextFeaturesClient() = default;
virtual bool IsEnabled(Document*,
ContextFeatures::FeatureType,
bool default_value) {
return default_value;
}
virtual void UrlDidChange(Document*) {}
};
CORE_EXPORT void ProvideContextFeaturesTo(
Page&,
std::unique_ptr<ContextFeaturesClient>);
void ProvideContextFeaturesToDocumentFrom(Document&, Page&);
inline bool ContextFeatures::IsEnabled(Document* document,
FeatureType type,
bool default_value) const {
if (!client_)
return default_value;
return client_->IsEnabled(document, type, default_value);
}
inline void ContextFeatures::UrlDidChange(Document* document) {
// FIXME: The original code, commented out below, is obviously
// wrong, but the seemingly correct fix of negating the test to
// the more logical 'if (!client_)' crashes the renderer.
// See issue 294180
//
// if (client_)
// return;
// client_->UrlDidChange(document);
}
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_DOM_CONTEXT_FEATURES_H_
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