WebCore/LayoutState.h

   1 /*
   2  * Copyright (C) 2007 Apple Inc.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef LayoutState_h
  27 #define LayoutState_h
  28
  29 #include "IntRect.h"
  30 #include "IntSize.h"
  31 #include <wtf/Noncopyable.h>
  32
  33 namespace WebCore {
  34
  35 class RenderArena;
  36 class RenderBox;
  37 class RenderObject;
  38
  39 class LayoutState : Noncopyable {
  40 public:
  41     LayoutState()
  42         : m_clipped(false)
  43         , m_next(0)
  44 #ifndef NDEBUG
  45         , m_renderer(0)
  46 #endif
  47     {
  48     }
  49
  50     LayoutState(LayoutState*, RenderBox*, const IntSize& offset);
  51     LayoutState(RenderObject*);
  52
  53     void destroy(RenderArena*);
  54
  55     // Overloaded new operator.
  56     void* operator new(size_t, RenderArena*) throw();
  57
  58     // Overridden to prevent the normal delete from being called.
  59     void operator delete(void*, size_t);
  60
  61 private:
  62     // The normal operator new is disallowed.
  63     void* operator new(size_t) throw();
  64
  65 public:
  66     bool m_clipped;
  67     IntRect m_clipRect;
  68     IntSize m_offset;       // x/y offset from container.
  69     IntSize m_layoutDelta;  // Transient offset from the final position of the object
  70                             // used to ensure that repaints happen in the correct place.
  71                             // This is a total delta accumulated from the root.
  72     LayoutState* m_next;
  73 #ifndef NDEBUG
  74     RenderObject* m_renderer;
  75 #endif
  76 };
  77
  78 } // namespace WebCore
  79
  80 #endif // LayoutState_h