The Tor Browser: layout/xul/nsBoxLayoutState.h@8bccb770b82d

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 /**

     8   Author:

     9   Eric D Vaughan

    11 **/

    13 #ifndef nsBoxLayoutState_h___

    14 #define nsBoxLayoutState_h___

    16 #include "nsCOMPtr.h"

    17 #include "nsPresContext.h"

    18 #include "nsIPresShell.h"

    20 class nsRenderingContext;

    21 class nsCalculatedBoxInfo;

    22 struct nsHTMLReflowMetrics;

    23 struct nsHTMLReflowState;

    24 class nsString;

    25 class nsHTMLReflowCommand;

    27 class MOZ_STACK_CLASS nsBoxLayoutState

    28 {

    29 public:

    30   nsBoxLayoutState(nsPresContext* aPresContext,

    31                    nsRenderingContext* aRenderingContext = nullptr,

    32                    // see OuterReflowState() below

    33                    const nsHTMLReflowState* aOuterReflowState = nullptr,

    34                    uint16_t aReflowDepth = 0) NS_HIDDEN;

    35   nsBoxLayoutState(const nsBoxLayoutState& aState) NS_HIDDEN;

    37   nsPresContext* PresContext() const { return mPresContext; }

    38   nsIPresShell* PresShell() const { return mPresContext->PresShell(); }

    40   uint32_t LayoutFlags() const { return mLayoutFlags; }

    41   void SetLayoutFlags(uint32_t aFlags) { mLayoutFlags = aFlags; }

    43   // if true no one under us will paint during reflow.

    44   void SetPaintingDisabled(bool aDisable) { mPaintingDisabled = aDisable; }

    45   bool PaintingDisabled() const { return mPaintingDisabled; }

    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   nsRenderingContext* GetRenderingContext() const { return mRenderingContext; }

    53   struct AutoReflowDepth {

    54     AutoReflowDepth(nsBoxLayoutState& aState)

    55       : mState(aState) { ++mState.mReflowDepth; }

    56     ~AutoReflowDepth() { --mState.mReflowDepth; }

    57     nsBoxLayoutState& mState;

    58   };

    60   // The HTML reflow state that lives outside the box-block boundary.

    61   // May not be set reliably yet.

    62   const nsHTMLReflowState* OuterReflowState() { return mOuterReflowState; }

    64   uint16_t GetReflowDepth() { return mReflowDepth; }

    66 private:

    67   nsRefPtr<nsPresContext> mPresContext;

    68   nsRenderingContext *mRenderingContext;

    69   const nsHTMLReflowState *mOuterReflowState;

    70   uint32_t mLayoutFlags;

    71   uint16_t mReflowDepth;

    72   bool mPaintingDisabled;

    73 };

    75 #endif

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