layout/xul/nsBoxLayoutState.h
author Chris Manchester <cmanchester@mozilla.com>
Wed, 16 Jan 2019 22:46:38 +0000
changeset 514323 471d9fab61b34671f974dfa349e7972c200faa2b
parent 508163 6f3709b3878117466168c40affa7bca0b60cf75b
child 529640 ca4ff21cf3541314675bd0d66690ef9a9e989abe
permissions -rw-r--r--
Bug 1507631 - Remove mentions of MOZ_SIGN_CMD from the build system. r=nalexander Differential Revision: https://phabricator.services.mozilla.com/D16754

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 gfxContext;
namespace mozilla {
struct ReflowInput;
}  // namespace mozilla

class MOZ_STACK_CLASS nsBoxLayoutState {
  using ReflowInput = mozilla::ReflowInput;

 public:
  explicit nsBoxLayoutState(nsPresContext* aPresContext,
                            gfxContext* 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.
  gfxContext* 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;
  gfxContext* mRenderingContext;
  const ReflowInput* mOuterReflowInput;
  uint32_t mLayoutFlags;
  uint16_t mReflowDepth;
  bool mPaintingDisabled;
};

#endif