text: /*
   * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
   * Copyright (C) 2004, 2005, 2006, 2009, 2010, 2013 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.
   *
   */
  
  #pragma once
  
  #include "HTMLFrameOwnerElement.h"
  #include "OverlapTestRequestClient.h"
  #include "RenderReplaced.h"
  #include "Widget.h"
  #include <wtf/WeakPtr.h>
  
  namespace WebCore {
  
  class WidgetHierarchyUpdatesSuspensionScope {
  public:
      WidgetHierarchyUpdatesSuspensionScope()
      {
          s_widgetHierarchyUpdateSuspendCount++;
      }
      ~WidgetHierarchyUpdatesSuspensionScope()
      {
          ASSERT(s_widgetHierarchyUpdateSuspendCount);
          if (s_widgetHierarchyUpdateSuspendCount == 1)
              moveWidgets();
          s_widgetHierarchyUpdateSuspendCount--;
      }
  
      static bool isSuspended() { return s_widgetHierarchyUpdateSuspendCount; }
      static void scheduleWidgetToMove(Widget& widget, FrameView* frame) { widgetNewParentMap().set(&widget, frame); }
  
  private:
      using WidgetToParentMap = HashMap<RefPtr<Widget>, FrameView*>;
      static WidgetToParentMap& widgetNewParentMap();
  
      WEBCORE_EXPORT void moveWidgets();
      WEBCORE_EXPORT static unsigned s_widgetHierarchyUpdateSuspendCount;
  };
      
  class RenderWidget : public RenderReplaced, private OverlapTestRequestClient {
  public:
      virtual ~RenderWidget();
  
      HTMLFrameOwnerElement& frameOwnerElement() const { return downcast<HTMLFrameOwnerElement>(nodeForNonAnonymous()); }
  
      Widget* widget() const { return m_widget.get(); }
      WEBCORE_EXPORT void setWidget(RefPtr<Widget>&&);
  
      static RenderWidget* find(const Widget&);
  
      enum class ChildWidgetState { Valid, Destroyed };
      ChildWidgetState updateWidgetPosition() WARN_UNUSED_RETURN;
      WEBCORE_EXPORT IntRect windowClipRect() const;
  
      bool requiresAcceleratedCompositing() const;
  
      WeakPtr<RenderWidget> createWeakPtr() { return m_weakPtrFactory.createWeakPtr(); }
  
      void ref() { ++m_refCount; }
      void deref();
  
  protected:
      RenderWidget(HTMLFrameOwnerElement&, RenderStyle&&);
  
      void willBeDestroyed() override;
      void styleDidChange(StyleDifference, const RenderStyle* oldStyle) final;
      void layout() override;
      void paint(PaintInfo&, const LayoutPoint&) override;
      bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) override;
      virtual void paintContents(PaintInfo&, const LayoutPoint&);
      bool requiresLayer() const override;
  
  private:
      void element() const = delete;
  
      bool isWidget() const final { return true; }
  
      bool needsPreferredWidthsRecalculation() const final;
      RenderBox* embeddedContentBox() const final;
  
      void setSelectionState(SelectionState) final;
      void setOverlapTestResult(bool) final;
  
      bool setWidgetGeometry(const LayoutRect&);
      bool updateWidgetGeometry();
  
      WeakPtrFactory<RenderWidget> m_weakPtrFactory;
      RefPtr<Widget> m_widget;
      IntRect m_clipRect; // The rectangle needs to remain correct after scrolling, so it is stored in content view coordinates, and not clipped to window.
      unsigned m_refCount { 1 };
  };
  
  inline void RenderWidget::deref()
  {
      ASSERT(m_refCount);
      if (!--m_refCount)
          delete this;
  }
  
  } // namespace WebCore
  
  SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderWidget, isWidget())
  