third_party/WebKit/Source/core/layout/LayoutPart.h

/*
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 *           (C) 2000 Simon Hausmann <hausmann@kde.org>
 * Copyright (C) 2006, 2009 Apple Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#ifndef LayoutPart_h
#define LayoutPart_h

#include "core/CoreExport.h"
#include "core/layout/LayoutReplaced.h"
#include "platform/FrameViewBase.h"

namespace blink {

// LayoutObject for frames via LayoutFrame and LayoutIFrame, and plugins via
// LayoutEmbeddedObject.
class CORE_EXPORT LayoutPart : public LayoutReplaced {
 public:
  explicit LayoutPart(Element*);
  ~LayoutPart() override;

  bool requiresAcceleratedCompositing() const;

  bool needsPreferredWidthsRecalculation() const final;

  bool nodeAtPoint(HitTestResult&,
                   const HitTestLocation& locationInContainer,
                   const LayoutPoint& accumulatedOffset,
                   HitTestAction) override;

  void ref() { ++m_refCount; }
  void deref();

  FrameViewBase* frameViewBase() const;

  LayoutRect replacedContentRect() const final;

  void updateOnWidgetChange();
  void updateGeometry();

  bool isLayoutPart() const final { return true; }
  virtual void paintContents(const PaintInfo&, const LayoutPoint&) const;

  bool isThrottledFrameView() const;

 protected:
  PaintLayerType layerTypeRequired() const override;

  void styleDidChange(StyleDifference, const ComputedStyle* oldStyle) final;
  void layout() override;
  void paint(const PaintInfo&, const LayoutPoint&) const override;
  CursorDirective getCursor(const LayoutPoint&, Cursor&) const final;

  // Overridden to invalidate the child frame if any.
  void invalidatePaintOfSubtreesIfNeeded(
      const PaintInvalidationState&) override;

 private:
  void updateGeometryInternal();
  CompositingReasons additionalCompositingReasons() const override;

  void willBeDestroyed() final;
  void destroy() final;

  bool nodeAtPointOverFrameViewBase(HitTestResult&,
                                    const HitTestLocation& locationInContainer,
                                    const LayoutPoint& accumulatedOffset,
                                    HitTestAction);

  int m_refCount;
};

DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutPart, isLayoutPart());

}  // namespace blink

#endif  // LayoutPart_h