layout/xul/nsStackLayout.h

   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/. */
   5
   6 /**
   7
   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.
  11
  12 **/
  13
  14 #ifndef nsStackLayout_h___
  15 #define nsStackLayout_h___
  16
  17 #include "mozilla/Attributes.h"
  18 #include "nsBoxLayout.h"
  19 #include "nsCOMPtr.h"
  20 #include "nsCoord.h"
  21
  22 class nsIPresShell;
  23
  24 nsresult NS_NewStackLayout(nsIPresShell* aPresShell, nsCOMPtr<nsBoxLayout>& aNewLayout);
  25
  26 class nsStackLayout : public nsBoxLayout
  27 {
  28 public:
  29
  30   friend nsresult NS_NewStackLayout(nsIPresShell* aPresShell, nsCOMPtr<nsBoxLayout>& aNewLayout);
  31   static void Shutdown();
  32
  33   nsStackLayout();
  34
  35   NS_IMETHOD Layout(nsIFrame* aBox, nsBoxLayoutState& aState) MOZ_OVERRIDE;
  36
  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;
  41
  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);
  47
  48 private:
  49   static nsBoxLayout* gInstance;
  50
  51 }; // class nsStackLayout
  52
  53
  54
  55 #endif
  56