The Tor Browser: layout/generic/nsViewportFrame.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     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 /*

     7  * rendering object that is the root of the frame tree, which contains

     8  * the document's scrollbars and contains fixed-positioned elements

     9  */

    11 #ifndef nsViewportFrame_h___

    12 #define nsViewportFrame_h___

    14 #include "mozilla/Attributes.h"

    15 #include "nsContainerFrame.h"

    17 class nsPresContext;

    19 /**

    20   * ViewportFrame is the parent of a single child - the doc root frame or a scroll frame

    21   * containing the doc root frame. ViewportFrame stores this child in its primary child

    22   * list.

    23   */

    24 class ViewportFrame : public nsContainerFrame {

    25 public:

    26   NS_DECL_QUERYFRAME_TARGET(ViewportFrame)

    27   NS_DECL_QUERYFRAME

    28   NS_DECL_FRAMEARENA_HELPERS

    30   typedef nsContainerFrame Super;

    32   ViewportFrame(nsStyleContext* aContext)

    33     : nsContainerFrame(aContext)

    34   {}

    35   virtual ~ViewportFrame() { } // useful for debugging

    37   virtual void Init(nsIContent*      aContent,

    38                     nsIFrame*        aParent,

    39                     nsIFrame*        asPrevInFlow) MOZ_OVERRIDE;

    41   virtual nsresult SetInitialChildList(ChildListID     aListID,

    42                                        nsFrameList&    aChildList) MOZ_OVERRIDE;

    44   virtual nsresult AppendFrames(ChildListID     aListID,

    45                                 nsFrameList&    aFrameList) MOZ_OVERRIDE;

    47   virtual nsresult InsertFrames(ChildListID     aListID,

    48                                 nsIFrame*       aPrevFrame,

    49                                 nsFrameList&    aFrameList) MOZ_OVERRIDE;

    51   virtual nsresult RemoveFrame(ChildListID     aListID,

    52                                nsIFrame*       aOldFrame) MOZ_OVERRIDE;

    54   virtual void BuildDisplayList(nsDisplayListBuilder*   aBuilder,

    55                                 const nsRect&           aDirtyRect,

    56                                 const nsDisplayListSet& aLists) MOZ_OVERRIDE;

    58   virtual nscoord GetMinWidth(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE;

    59   virtual nscoord GetPrefWidth(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE;

    60   virtual nsresult Reflow(nsPresContext*          aPresContext,

    61                           nsHTMLReflowMetrics&     aDesiredSize,

    62                           const nsHTMLReflowState& aReflowState,

    63                           nsReflowStatus&          aStatus) MOZ_OVERRIDE;

    65   /**

    66    * Get the "type" of the frame

    67    *

    68    * @see nsGkAtoms::viewportFrame

    69    */

    70   virtual nsIAtom* GetType() const MOZ_OVERRIDE;

    72   /**

    73    * Adjust aReflowState to account for scrollbars and pres shell

    74    * GetScrollPositionClampingScrollPortSizeSet and

    75    * GetContentDocumentFixedPositionMargins adjustments.

    76    * @return the rect to use as containing block rect

    77    */

    78   nsRect AdjustReflowStateAsContainingBlock(nsHTMLReflowState* aReflowState) const;

    80 #ifdef DEBUG_FRAME_DUMP

    81   virtual nsresult GetFrameName(nsAString& aResult) const MOZ_OVERRIDE;

    82 #endif

    84 private:

    85   virtual mozilla::layout::FrameChildListID GetAbsoluteListID() const MOZ_OVERRIDE { return kFixedList; }

    87 protected:

    88   /**

    89    * Calculate how much room is available for fixed frames. That means

    90    * determining if the viewport is scrollable and whether the vertical and/or

    91    * horizontal scrollbars are visible.  Adjust the computed width/height and

    92    * available width for aReflowState accordingly.

    93    * @return the current scroll position, or 0,0 if not scrollable

    94    */

    95   nsPoint AdjustReflowStateForScrollbars(nsHTMLReflowState* aReflowState) const;

    96 };

    99 #endif // nsViewportFrame_h___

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