third_party/WebKit/Source/core/testing/DummyPageHolder.h

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#ifndef DummyPageHolder_h
#define DummyPageHolder_h

#include <memory>
#include "base/macros.h"
#include "core/frame/LocalFrameClient.h"
#include "core/page/Page.h"
#include "platform/geometry/IntSize.h"
#include "platform/heap/Handle.h"
#include "platform/wtf/Allocator.h"

namespace blink {

class Document;
class IntSize;
class LocalFrame;
class LocalFrameView;
class Settings;

typedef void (*FrameSettingOverrideFunction)(Settings&);

// Creates a dummy Page, LocalFrame, and LocalFrameView whose clients are all
// no-op.
//
// This class can be used when you write unit tests for components which do not
// work correctly without layoutObjects.  To make sure the layoutObjects are
// created, you need to call |frameView().layout()| after you add nodes into
// |document()|.
//
// Since DummyPageHolder stores empty clients in it, it must outlive the Page,
// LocalFrame, LocalFrameView and any other objects created by it.
// DummyPageHolder's destructor ensures this condition by checking remaining
// references to the LocalFrame.

class DummyPageHolder {
  USING_FAST_MALLOC(DummyPageHolder);

 public:
  static std::unique_ptr<DummyPageHolder> Create(
      const IntSize& initial_view_size = IntSize(),
      Page::PageClients* = nullptr,
      LocalFrameClient* = nullptr,
      FrameSettingOverrideFunction = nullptr);
  ~DummyPageHolder();

  Page& GetPage() const;
  LocalFrame& GetFrame() const;
  LocalFrameView& GetFrameView() const;
  Document& GetDocument() const;

 private:
  DummyPageHolder(const IntSize& initial_view_size,
                  Page::PageClients*,
                  LocalFrameClient*,
                  FrameSettingOverrideFunction setting_overrider);

  Persistent<Page> page_;

  // The LocalFrame is accessed from worker threads by unit tests
  // (WorkerThreadableLoaderTest), hence we need to allow cross-thread
  // usage of |m_frame|.
  //
  // TODO: rework the tests to not require cross-thread access.
  CrossThreadPersistent<LocalFrame> frame_;

  Persistent<LocalFrameClient> local_frame_client_;
  DISALLOW_COPY_AND_ASSIGN(DummyPageHolder);
};

}  // namespace blink

#endif  // DummyPageHolder_h