The Tor Browser: layout/xul/nsStackLayout.h@7e26c7da4463

     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   Eric D Vaughan

     9   A frame that can have multiple children. Only one child may be displayed at one time. So the

    10   can be flipped though like a deck of cards.

    12 **/

    14 #ifndef nsStackLayout_h___

    15 #define nsStackLayout_h___

    17 #include "mozilla/Attributes.h"

    18 #include "nsBoxLayout.h"

    19 #include "nsCOMPtr.h"

    20 #include "nsCoord.h"

    22 class nsIPresShell;

    24 nsresult NS_NewStackLayout(nsIPresShell* aPresShell, nsCOMPtr<nsBoxLayout>& aNewLayout);

    26 class nsStackLayout : public nsBoxLayout

    27 {

    28 public:

    30   friend nsresult NS_NewStackLayout(nsIPresShell* aPresShell, nsCOMPtr<nsBoxLayout>& aNewLayout);

    31   static void Shutdown();

    33   nsStackLayout();

    35   NS_IMETHOD Layout(nsIFrame* aBox, nsBoxLayoutState& aState) MOZ_OVERRIDE;

    37   virtual nsSize GetPrefSize(nsIFrame* aBox, nsBoxLayoutState& aBoxLayoutState) MOZ_OVERRIDE;

    38   virtual nsSize GetMinSize(nsIFrame* aBox, nsBoxLayoutState& aBoxLayoutState) MOZ_OVERRIDE;

    39   virtual nsSize GetMaxSize(nsIFrame* aBox, nsBoxLayoutState& aBoxLayoutState) MOZ_OVERRIDE;

    40   virtual nscoord GetAscent(nsIFrame* aBox, nsBoxLayoutState& aBoxLayoutState) MOZ_OVERRIDE;

    42   // get the child offsets for aChild and set them in aMargin. Returns a

    43   // bitfield mask of the SPECIFIED_LEFT, SPECIFIED_RIGHT, SPECIFIED_TOP and

    44   // SPECIFIED_BOTTOM offsets indicating which sides have been specified by

    45   // attributes.

    46   static uint8_t GetOffset(nsBoxLayoutState& aState, nsIFrame* aChild, nsMargin& aMargin);

    48 private:

    49   static nsBoxLayout* gInstance;

    51 }; // class nsStackLayout

    55 #endif

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