layout/xul/nsBoxLayoutState.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 /**
   8
   9   Author:
  10   Eric D Vaughan
  11
  12 **/
  13
  14 #ifndef nsBoxLayoutState_h___
  15 #define nsBoxLayoutState_h___
  16
  17 #include "nsCOMPtr.h"
  18 #include "nsPresContext.h"
  19 #include "nsIPresShell.h"
  20
  21 class gfxContext;
  22 namespace mozilla {
  23 struct ReflowInput;
  24 }  // namespace mozilla
  25
  26 class MOZ_STACK_CLASS nsBoxLayoutState {
  27   using ReflowInput = mozilla::ReflowInput;
  28
  29  public:
  30   explicit nsBoxLayoutState(nsPresContext* aPresContext,
  31                             gfxContext* aRenderingContext = nullptr,
  32                             // see OuterReflowInput() below
  33                             const ReflowInput* aOuterReflowInput = nullptr,
  34                             uint16_t aReflowDepth = 0);
  35   nsBoxLayoutState(const nsBoxLayoutState& aState);
  36
  37   nsPresContext* PresContext() const { return mPresContext; }
  38   nsIPresShell* PresShell() const { return mPresContext->PresShell(); }
  39
  40   uint32_t LayoutFlags() const { return mLayoutFlags; }
  41   void SetLayoutFlags(uint32_t aFlags) { mLayoutFlags = aFlags; }
  42
  43   // if true no one under us will paint during reflow.
  44   void SetPaintingDisabled(bool aDisable) { mPaintingDisabled = aDisable; }
  45   bool PaintingDisabled() const { return mPaintingDisabled; }
  46
  47   // The rendering context may be null for specialized uses of
  48   // nsBoxLayoutState and should be null-checked before it is used.
  49   // However, passing a null rendering context to the constructor when
  50   // doing box layout or intrinsic size calculation will cause bugs.
  51   gfxContext* GetRenderingContext() const { return mRenderingContext; }
  52
  53   struct AutoReflowDepth {
  54     explicit AutoReflowDepth(nsBoxLayoutState& aState) : mState(aState) {
  55       ++mState.mReflowDepth;
  56     }
  57     ~AutoReflowDepth() { --mState.mReflowDepth; }
  58     nsBoxLayoutState& mState;
  59   };
  60
  61   // The HTML reflow state that lives outside the box-block boundary.
  62   // May not be set reliably yet.
  63   const ReflowInput* OuterReflowInput() { return mOuterReflowInput; }
  64
  65   uint16_t GetReflowDepth() { return mReflowDepth; }
  66
  67  private:
  68   RefPtr<nsPresContext> mPresContext;
  69   gfxContext* mRenderingContext;
  70   const ReflowInput* mOuterReflowInput;
  71   uint32_t mLayoutFlags;
  72   uint16_t mReflowDepth;
  73   bool mPaintingDisabled;
  74 };
  75
  76 #endif