third_party/blink/renderer/core/testing/dummy_page_holder.h

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#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_TESTING_DUMMY_PAGE_HOLDER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_TESTING_DUMMY_PAGE_HOLDER_H_

#include <memory>

#include "base/bind_helpers.h"
#include "base/callback.h"
#include "base/macros.h"
#include "base/time/default_tick_clock.h"
#include "third_party/blink/renderer/core/frame/local_frame_client.h"
#include "third_party/blink/renderer/core/page/page.h"
#include "third_party/blink/renderer/core/testing/scoped_mock_overlay_scrollbars.h"
#include "third_party/blink/renderer/platform/geometry/int_size.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"

namespace blink {

class Document;
class IntSize;
class LocalFrame;
class LocalFrameView;
class 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:
  DummyPageHolder(
      const IntSize& initial_view_size = IntSize(),
      Page::PageClients* = nullptr,
      LocalFrameClient* = nullptr,
      base::OnceCallback<void(Settings&)> setting_overrider =
          base::NullCallback(),
      const base::TickClock* clock = base::DefaultTickClock::GetInstance());
  ~DummyPageHolder();

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

 private:
  Persistent<Page> page_;

  // Unit tests need to run with a mock theme enabled. This is necessitated
  // particularly by Android on which unit tests run without a platform theme
  // engine.
  ScopedMockOverlayScrollbars enable_mock_scrollbars_;

  // The LocalFrame is accessed from worker threads by unit tests
  // (ThreadableLoaderTest), 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  // THIRD_PARTY_BLINK_RENDERER_CORE_TESTING_DUMMY_PAGE_HOLDER_H_