import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

layout/xul/nsBoxLayoutState.h

@@ -0,0 +1,77 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ 
+  Author:
+  Eric D Vaughan
+
+**/
+
+#ifndef nsBoxLayoutState_h___
+#define nsBoxLayoutState_h___
+
+#include "nsCOMPtr.h"
+#include "nsPresContext.h"
+#include "nsIPresShell.h"
+
+class nsRenderingContext;
+namespace mozilla {
+struct ReflowInput;
+} // namespace mozilla
+
+
+class MOZ_STACK_CLASS nsBoxLayoutState
+{
+  using ReflowInput = mozilla::ReflowInput;
+
+public:
+  explicit nsBoxLayoutState(nsPresContext* aPresContext,
+                            nsRenderingContext* aRenderingContext = nullptr,
+                            // see OuterReflowInput() below
+                            const ReflowInput* aOuterReflowInput = nullptr,
+                            uint16_t aReflowDepth = 0);
+  nsBoxLayoutState(const nsBoxLayoutState& aState);
+
+  nsPresContext* PresContext() const { return mPresContext; }
+  nsIPresShell* PresShell() const { return mPresContext->PresShell(); }
+
+  uint32_t LayoutFlags() const { return mLayoutFlags; }
+  void SetLayoutFlags(uint32_t aFlags) { mLayoutFlags = aFlags; }
+
+  // if true no one under us will paint during reflow.
+  void SetPaintingDisabled(bool aDisable) { mPaintingDisabled = aDisable; }
+  bool PaintingDisabled() const { return mPaintingDisabled; }
+
+  // The rendering context may be null for specialized uses of
+  // nsBoxLayoutState and should be null-checked before it is used.
+  // However, passing a null rendering context to the constructor when
+  // doing box layout or intrinsic size calculation will cause bugs.
+  nsRenderingContext* GetRenderingContext() const { return mRenderingContext; }
+
+  struct AutoReflowDepth {
+    explicit AutoReflowDepth(nsBoxLayoutState& aState)
+      : mState(aState) { ++mState.mReflowDepth; }
+    ~AutoReflowDepth() { --mState.mReflowDepth; }
+    nsBoxLayoutState& mState;
+  };
+
+  // The HTML reflow state that lives outside the box-block boundary.
+  // May not be set reliably yet.
+  const ReflowInput* OuterReflowInput() { return mOuterReflowInput; }
+
+  uint16_t GetReflowDepth() { return mReflowDepth; }
+  
+private:
+  RefPtr<nsPresContext> mPresContext;
+  nsRenderingContext *mRenderingContext;
+  const ReflowInput *mOuterReflowInput;
+  uint32_t mLayoutFlags;
+  uint16_t mReflowDepth; 
+  bool mPaintingDisabled;
+};
+
+#endif
+