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%% @doc See external documentation: <a href="http://www.wxwidgets.org/manuals/2.8.12/wx_wxsizer.html">wxSizer</a>.
%% @type wxSizer(). 
  
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%                 
%%                                                \/  Overarching Sizers Overview @ Bottom
%%
%%   OVERVIEW
%%   ––––––––
%%   wxSizer is the abstract base class used for laying out 
%%   subwindows in a window. You cannot use wxSizer directly; instead, 
%%   you will have to use one of the sizer classes derived from it. 
%%   Currently there are wxBoxSizer, 
%%                       wxStaticBoxSizer, wxGridSizer wxFlexGridSizer and wxGridBagSizer.
%%
%%   The layout algorithm used by sizers in wxWidgets is closely related to 
%%   layout in other GUI toolkits, such as Java's AWT, the GTK toolkit 
%%   or the Qt toolkit. It is based upon the idea of the individual 
%%   subwindows reporting their minimal required size and their 
%%   ability to get stretched if the size of the parent window 
%%   has changed. This will most often mean that the programmer 
%%   does not set the original size of a dialog in the beginning, 
%%   rather the dialog will be assigned a sizer and this sizer will 
%%   be queried about the recommended size. The sizer in turn will 
%%   query its children, which can be normal windows, empty space or 
%%   other sizers, so that a hierarchy of sizers can be constructed. 
%%   Note that wxSizer does not derive from wxWindow and thus does not 
%%   interfere with tab ordering and requires very little resources compared 
%%   to a real window on screen.
%%   
%%   What makes sizers so well fitted for use in wxWidgets is the fact that 
%%   every control reports its own minimal size and the algorithm can handle 
%%   differences in font sizes or different window (dialog item) sizes on 
%%   different platforms without problems. If e.g. the standard font as well 
%%   as the overall design of Motif widgets requires more space than on Windows, 
%%   the initial dialog size will automatically be bigger on Motif than on Windows.
%%   
%%   Sizers may also be used to control the layout of custom drawn items on the 
%%   window. The Add, Insert, and Prepend functions return a pointer to the 
%%   newly added wxSizerItem. Just add empty space of the desired size and 
%%   attributes, and then use the wxSizerItem::GetRect method to determine 
%%   where the drawing operations should take place.
%%   
%%   Please notice that sizers, like child windows, are owned by the library 
%%   and will be deleted by it which implies that they must be allocated on 
%%   the heap. However if you create a sizer and do not add it to another 
%%   sizer or window, the library wouldn't be able to delete such an orphan 
%%   sizer and in this, and only this, case it should be deleted explicitly.
%%   
%%   
%%   
%%   See Also:
%%   —————————
%%   
%%   
%%   
-module(wxSizer).
-include("wxe.hrl").
-export([add/2,add/3,add/4,addSpacer/2,addStretchSpacer/1,addStretchSpacer/2,
  calcMin/1,clear/1,clear/2,detach/2,fit/2,fitInside/2,getChildren/1,getItem/2,
  getItem/3,getMinSize/1,getPosition/1,getSize/1,hide/2,hide/3,insert/3,
  insert/4,insert/5,insertSpacer/3,insertStretchSpacer/2,insertStretchSpacer/3,
  isShown/2,layout/1,prepend/2,prepend/3,prepend/4,prependSpacer/2,prependStretchSpacer/1,
  prependStretchSpacer/2,recalcSizes/1,remove/2,replace/3,replace/4,
  setDimension/5,setItemMinSize/3,setItemMinSize/4,setMinSize/2,setMinSize/3,
  setSizeHints/2,setVirtualSizeHints/2,show/2,show/3]).

%% inherited exports
-export([parent_class/1]).

-export_type([wxSizer/0]).
%% @hidden
parent_class(_Class) -> erlang:error({badtype, ?MODULE}).

-type wxSizer()  ::  wx:wx_object(). 





      %·%% ADD %%·%
%%   
%% See below...
%% @equiv add(This,Window, [])
          -spec add(This, Window) -> wxSizerItem:wxSizerItem()
           when
           This   :: wxSizer(), 
           Window :: wxWindow:wxWindow() 
                   | wxSizer(). 

add(This,Window)
           when 
           is_record(This, wx_ref),
           is_record(Window, wx_ref) ->  add(This,Window, []).

      %·%% ADD %%·%
%% See below...  
%% Return Value:
%% See Also:
%%*%%*%%
          -spec add(This, Width, Height) -> wxSizerItem:wxSizerItem()
           when
           This :: wxSizer(), 
           Width :: integer(), 
           Height :: integer();
     
                   (This, Window, [Option]) -> wxSizerItem:wxSizerItem()
           when
           This    ::           wxSizer(), 
           Window  :: wxWindow:wxWindow() 
                    |           wxSizer(),
           Option  :: {proportion,    integer()}
                    | {flag,          integer()}
                    | {border,        integer()}
                    | {userData, wx:wx_object()};

                   (This, Window, Flags) -> wxSizerItem:wxSizerItem()
           when
           This   ::                   wxSizer(), 
           Window ::         wxWindow:wxWindow() 
                   |                   wxSizer(), 
           Flags  :: wxSizerFlags:wxSizerFlags(). 


add(This,Width,Height)
           when 
           is_record(This, wx_ref),
           is_integer(Width),
           is_integer(Height) ->  add(This,Width,Height, []);

add(#wx_ref{type=ThisT,ref=ThisRef},
    #wx_ref{type=WindowT,ref=WindowRef}, 
                                  Options)
           when 
           is_list(Options) ->
                             ?CLASS(ThisT,wxSizer),
                    WindowOP = 
                             case 
                                ?CLASS_T(WindowT,wxWindow) of
                                   true ->
                                     ?wxSizer_Add_2_1;
                                   _ -> ?CLASS(WindowT,wxSizer),
                                     ?wxSizer_Add_2_0
                             end,
                     MOpts = fun({proportion, Proportion}, Acc) -> [<<1:32/?UI,Proportion:32/?UI>>|Acc];
                                ({flag,             Flag}, Acc) -> [<<2:32/?UI,Flag:32/?UI>>|Acc];
                                ({border,         Border}, Acc) -> [<<3:32/?UI,Border:32/?UI>>|Acc];
                                ({userData, #wx_ref{type=UserDataT,ref=UserDataRef}}, Acc) ->  ?CLASS(UserDataT,wx),[<<4:32/?UI,UserDataRef:32/?UI>>|Acc];
                                                    (BadOpt, _) -> erlang:error({badoption, BadOpt})
                             end,
                     BinOpt = list_to_binary(lists:foldl(MOpts, [<<0:32>>], Options)),
                                          wxe_util:call(WindowOP,
                                          <<ThisRef:32/?UI,WindowRef:32/?UI, BinOpt/binary>>);

add(#wx_ref{type=ThisT,ref=ThisRef},
    #wx_ref{type=WindowT,ref=WindowRef},
    #wx_ref{type=FlagsT,ref=FlagsRef}) ->
                                        ?CLASS(ThisT,wxSizer),
                               WindowOP = 
                                        case 
                                           ?CLASS_T(WindowT,wxWindow) 
                                          of
                                             true ->
                                                   ?CLASS(FlagsT,wxSizerFlags),
                                                   ?wxSizer_Add_2_3;
                                                _ -> 
                                                   ?CLASS(WindowT,wxSizer),
                                                   ?CLASS(FlagsT,wxSizerFlags),
                                                   ?wxSizer_Add_2_2
                                         end,
                                         wxe_util:call(WindowOP,
                                         <<ThisRef:32/?UI,WindowRef:32/?UI,FlagsRef:32/?UI>>).





      %·%% ADD %%·%
%%   
%%   Appends a child to the sizer. wxSizer itself is an abstract class, 
%%   but the parameters are equivalent in the derived classes that you will 
%%   instantiate to use it so they are described here:
%%   
%%   window
%%   
%%      The window to be added to the sizer. 
%%      Its initial size (either set explicitly by the user or calculated 
%%      internally when using wxDefaultSize) is interpreted as the minimal 
%%      and in many cases also the initial size.
%%   
%%   sizer
%%   
%%      The (child-)sizer to be added to the sizer. 
%%      This allows placing a child sizer in a sizer and thus to 
%%      create hierarchies of sizers (typically a vertical box as the 
%%      top sizer and several horizontal boxes on the level beneath).
%%   
%%   width and height
%%   
%%      The dimension of a spacer to be added to the sizer. 
%%      Adding spacers to sizers gives more flexibility in the design 
%%      of dialogs; imagine for example a horizontal box with two buttons 
%%      at the bottom of a dialog: you might want to insert a space between 
%%      the two buttons and make that space stretchable using the proportion 
%%      flag and the result will be that the left button will be aligned with 
%%      the left side of the dialog and the right button with the right side - 
%%      the space in between will shrink and grow with the dialog.
%%   
%%   proportion
%%   
%%      Although the meaning of this parameter is undefined in wxSizer, 
%%      it is used in wxBoxSizer to indicate if a child of a sizer can change 
%%      its size in the main orientation of the wxBoxSizer - where 0 stands for 
%%      not changeable and a value of more than zero is interpreted relative to 
%%      the value of other children of the same wxBoxSizer. For example, you 
%%      might have a horizontal wxBoxSizer with three children, two of which 
%%      are supposed to change their size with the sizer. 
%%      Then the two stretchable windows would get a value of 1 each to 
%%      make them grow and shrink equally with the sizer's horizontal dimension.
%%   
%%   flag
%%   
%%      This parameter can be used to set a number of flags which can be 
%%      combined using the binary OR operator |. Two main behaviours are 
%%      defined using these flags. One is the border around a window: the 
%%      border parameter determines the border width whereas the flags 
%%      given here determine which side(s) of the item that the border 
%%      will be added. The other flags determine how the sizer item 
%%      behaves when the space allotted to the sizer changes, and is 
%%      somewhat dependent on the specific kind of sizer used.
%%   
%%           wxTOP
%%           wxBOTTOM
%%           wxLEFT
%%           wxRIGHT
%%           wxALL      These flags are used to specify which side(s) 
%%                      of the sizer item the border width will apply to.
%%           
%%           wxEXPAND   The item will be expanded to fill the space assigned 
%%                      to the item.
%%   
%%           wxSHAPED   The item will be expanded as much as possible while 
%%                      also maintaining its aspect ratio
%%   
%%           wxFIXED_MINSIZE   Normally wxSizers will use GetAdjustedBestSize to 
%%                             determine what the minimal size of window items 
%%                             should be, and will use that size to calculate the 
%%                             layout. This allows layouts to adjust when an item 
%%                             changes and its best size becomes different. If you 
%%                             would rather have a window item stay the size it 
%%                             started with then use wxFIXED_MINSIZE.
%%   
%%           wxRESERVE_SPACE_EVEN_IF_HIDDEN  
%%                             Normally wxSizers don't allocate space for hidden 
%%                             windows or other items. This flag overrides this 
%%                             behavior so that sufficient space is allocated for 
%%                             the window even if it isn't visible. This makes it 
%%                             possible to dynamically show and hide controls 
%%                             without resizing parent dialog, for example. 
%%                             This function is new since wxWidgets version 2.8.8
%%                             
%%           wxALIGN_LEFT      The wxALIGN flags allow you to specify the alignment 
%%           wxALIGN_RIGHT     of the item within the space allotted to it by the sizer, 
%%           wxALIGN_TOP       adjusted for the border if any.
%%           wxALIGN_BOTTOM
%%           wxALIGN_CENTER wxALIGN_CENTRE
%%           wxALIGN_CENTER_VERTICAL wxALIGN_CENTRE_VERTICAL
%%           wxALIGN_CENTER_HORIZONTAL wxALIGN_CENTRE_HORIZONTAL   
%%                             
%%
%%   border
%%
%%       Determines the border width, if the flag parameter is set to include 
%%       any border flag.
%%
%%   userData
%%   
%%       Allows an extra object to be attached to the sizer item, 
%%       for use in derived classes when sizing information is more 
%%       complex than the proportion and flag will allow for.
%%
%%   flags
%%   
%%       A wxSizerFlags object that enables you to specify most of the 
%%       above parameters more conveniently.
%%   
%% Return Value:
%% See Also:
%%*%%*%%
          -spec add(This, Width, Height, [Option]) -> wxSizerItem:wxSizerItem()
           when
           This    :: wxSizer(), 
           Width   :: integer(), 
           Height  :: integer(),
           Option  :: {proportion,    integer()}
                    | {flag,          integer()}
                    | {border,        integer()}
                    | {userData, wx:wx_object()}. 

add(#wx_ref{type=ThisT,ref=ThisRef}, Width, Height, Options)
           when 
           is_integer(Width),
           is_integer(Height),
           is_list(Options) ->
                             ?CLASS(ThisT,wxSizer),
                   MOpts = fun({proportion, Proportion}, Acc) -> [<<1:32/?UI,Proportion:32/?UI>>|Acc];
                              ({flag,             Flag}, Acc) -> [<<2:32/?UI,Flag:32/?UI>>|Acc];
                              ({border,         Border}, Acc) -> [<<3:32/?UI,Border:32/?UI>>|Acc];
                              ({userData, #wx_ref{type=UserDataT,ref=UserDataRef}}, Acc) ->  ?CLASS(UserDataT,wx),[<<4:32/?UI,UserDataRef:32/?UI>>|Acc];
                                                  (BadOpt, _) -> erlang:error({badoption, BadOpt})
                           end,
                   BinOpt = list_to_binary(lists:foldl(MOpts, [<<0:32>>], Options)),
                                        wxe_util:call(?wxSizer_Add_3,
                                        <<ThisRef:32/?UI,Width:32/?UI,Height:32/?UI, 0:32,BinOpt/binary>>).









      %·%% ADD SPACER %%·%
%%   
%%   Adds non-stretchable space to the sizer. 
%%   More readable way of calling Add(size, size, 0).
%%   
%% Return Value:
%% See Also:
%%*%%*%%
          -spec addSpacer(This, Size) -> wxSizerItem:wxSizerItem()
           when
           This :: wxSizer(), 
           Size :: integer(). 

addSpacer(#wx_ref{type=ThisT,ref=ThisRef}, Size)
           when 
           is_integer(Size) ->
                             ?CLASS(ThisT,wxSizer),
               wxe_util:call(?wxSizer_AddSpacer,
               <<ThisRef:32/?UI,Size:32/?UI>>).






      %·%% ADD STRETCH SPACER %%·%
%%   
%% See below...
%% @equiv addStretchSpacer(This, [])
          -spec addStretchSpacer(This) -> wxSizerItem:wxSizerItem()
           when
           This :: wxSizer(). 


addStretchSpacer(This)
           when 
           is_record(This, wx_ref) ->  addStretchSpacer(This, []).

      %·%% ADD STRETCH SPACER %%·%
%%   
%%    Adds stretchable space to the sizer. More readable way of calling Add(0, 0, prop).
%%   
%% Return Value:
%% See Also:
%%*%%*%%
          -spec addStretchSpacer(This, [Option]) -> wxSizerItem:wxSizerItem()
           when
           This    ::         wxSizer(),
           Option  ::  {prop, integer()}. 

addStretchSpacer(#wx_ref{type=ThisT,ref=ThisRef}, Options)
           when 
           is_list(Options) ->
                             ?CLASS(ThisT,wxSizer),
                   MOpts = fun({prop, Prop}, Acc) -> [<<1:32/?UI,Prop:32/?UI>>|Acc];
                                      (BadOpt, _) -> erlang:error({badoption, BadOpt})
                           end,
                   BinOpt = list_to_binary(lists:foldl(MOpts, [<<0:32>>], Options)),
                                        wxe_util:call(?wxSizer_AddStretchSpacer,
                                        <<ThisRef:32/?UI, 0:32,BinOpt/binary>>).






      %·%% CALC MIN %%·%
%%   
%%   This method is abstract and has to be overwritten by any derived class. 
%%   Here, the sizer will do the actual calculation of its children minimal sizes.
%%   
%% Return Value:
%% See Also:
%%*%%*%%
   "http://www.wxwidgets.org/manuals/2.8.12/wx_wxsizer.html#wxsizercalcmin">external documentation</a>.
          -spec calcMin(This) -> {W :: integer(), H :: integer()}
           when
           This :: wxSizer(). 

calcMin(#wx_ref{type=ThisT,ref=ThisRef}) ->
                                          ?CLASS(ThisT,wxSizer),
                            wxe_util:call(?wxSizer_CalcMin,
                            <<ThisRef:32/?UI>>).






      %·%% CLEAR %%·%
%%   
%% See below...
%% @equiv clear(This, [])
          -spec clear(This) -> ok
           when
           This :: wxSizer(). 


clear(This)
           when 
           is_record(This, wx_ref) ->  clear(This, []).

      %·%% CLEAR %%·%
%%   
%%   Detaches all children from the sizer.
%%   If delete_windows is true then child windows will also be deleted.
%%   
%% Return Value:
%% See Also:
%%*%%*%%
          -spec clear(This, [Option]) -> ok
           when
           This    ::                  wxSizer(),
           Option  :: {delete_windows, boolean()}. 

clear(#wx_ref{type=ThisT,ref=ThisRef}, Options)
           when 
           is_list(Options) ->
                             ?CLASS(ThisT,wxSizer),
                   MOpts = fun({delete_windows, Delete_windows}, Acc) -> [<<1:32/?UI,(wxe_util:from_bool(Delete_windows)):32/?UI>>|Acc];
                                                          (BadOpt, _) -> erlang:error({badoption, BadOpt})
                           end,
                   BinOpt = list_to_binary(lists:foldl(MOpts, [<<0:32>>], Options)),
                                        wxe_util:cast(?wxSizer_Clear,
                                        <<ThisRef:32/?UI, 0:32,BinOpt/binary>>).





      %·%% DETACH %%·%
%%   
%%   Detach a child from the sizer without destroying it. 
%%   window is the window to be detached, sizer is the equivalent sizer and 
%%   index is the position of the child in the sizer, typically 0 for the 
%%   first item. This method does not cause any layout or resizing to take 
%%   place, call wxSizer::Layout to update the layout "on screen" after 
%%   detaching a child from the sizer.
%%
%%   Returns true if the child item was found and detached, false otherwise.
%%   
%% Return Value: wxSizer:Remove
%% See Also:
%%*%%*%%
          -spec detach(This, Index)  -> boolean()
           when
           This  :: wxSizer(), 
           Index :: integer();
     
                      (This, Window) -> boolean()
           when
           This   ::           wxSizer(), 
           Window :: wxWindow:wxWindow() 
                   |           wxSizer(). 

detach(#wx_ref{type=ThisT,ref=ThisRef}, Index)
           when 
           is_integer(Index) ->
                              ?CLASS(ThisT,wxSizer),
                wxe_util:call(?wxSizer_Detach_1_0,
                <<ThisRef:32/?UI,Index:32/?UI>>);

detach(#wx_ref{type=ThisT,ref=ThisRef},
       #wx_ref{type=WindowT,ref=WindowRef}) ->
                                             ?CLASS(ThisT,wxSizer),
                                    WindowOP = 
                                             case 
                                             ?CLASS_T(WindowT,wxWindow) 
                                             of
                                                 true ->
                                                       ?wxSizer_Detach_1_2;
                                                    _ -> 
                                                       ?CLASS(WindowT,wxSizer),
                                                       ?wxSizer_Detach_1_1
                                             end,
                                             wxe_util:call(WindowOP,
                                             <<ThisRef:32/?UI,WindowRef:32/?UI>>).






      %·%% FIT %%·%
%%   
%%   Tell the sizer to resize the window to match the sizer's minimal size. 
%%   This is commonly done in the constructor of the window itself, 
%%   see sample in the description of wxBoxSizer. Returns the new size.
%%   
%%   For a top level window this is the total window size, not client size.
%%   
%% Return Value:
%% See Also:
%%*%%*%%
          -spec fit(This, Window) -> {W :: integer(), H :: integer()}
           when
           This   ::           wxSizer(), 
           Window :: wxWindow:wxWindow(). 

fit(#wx_ref{type=ThisT,ref=ThisRef},
    #wx_ref{type=WindowT,ref=WindowRef}) ->
                                          ?CLASS(ThisT,wxSizer),
                                          ?CLASS(WindowT,wxWindow),
                            wxe_util:call(?wxSizer_Fit,
                            <<ThisRef:32/?UI,WindowRef:32/?UI>>).






      %·%% FIT INSIDE %%·%
%%   
%%   Tell the sizer to resize the virtual size of the window to match the 
%%   sizer's minimal size. This will not alter the on screen size of the window, 
%%   but may cause the addition/removal/alteration of scrollbars required to 
%%   view the virtual area in windows which manage it.
%%   
%% Return Value:
%% See Also: wxScrolledWindow::SetScrollbars, wxSizer::SetVirtualSizeHints
%%*%%*%%
          -spec fitInside(This, Window) -> ok
           when
           This   ::           wxSizer(), 
           Window :: wxWindow:wxWindow(). 

fitInside(#wx_ref{type=ThisT,ref=ThisRef},
          #wx_ref{type=WindowT,ref=WindowRef}) ->
                                                ?CLASS(ThisT,wxSizer),
                                                ?CLASS(WindowT,wxWindow),
                                  wxe_util:cast(?wxSizer_FitInside,
                                  <<ThisRef:32/?UI,WindowRef:32/?UI>>).





      %·%% GET CHILDREN %%·%
%%   
%%   Returns the list of the items in this sizer. 
%%   The elements of type-safe wxList wxSizerItemList are objects of type w
%%   xSizerItem *.
%%   
%% Return Value:
%% See Also:
%%*%%*%%
          -spec getChildren(This) -> [wxSizerItem:wxSizerItem()] 
           when
           This :: wxSizer(). 

getChildren(#wx_ref{type=ThisT,ref=ThisRef}) ->
                                              ?CLASS(ThisT,wxSizer),
                                wxe_util:call(?wxSizer_GetChildren,
                                <<ThisRef:32/?UI>>).





      %·%% GET ITEM / 2 %%·%
%%   
%% See below...
%% Return Value:
%% See Also:
%%*%%*%%
          -spec getItem(This, Window) -> wxSizerItem:wxSizerItem()
           when
           This   ::           wxSizer(), 
           Window :: wxWindow:wxWindow() 
                             | wxSizer();
        
                       (This, Index)  -> wxSizerItem:wxSizerItem()
           when
           This  :: wxSizer(), 
           Index :: integer(). 


getItem(This,Window)
           when 
           is_record(This, wx_ref),
           is_record(Window, wx_ref) ->  getItem(This,Window, []);

getItem(#wx_ref{type=ThisT,ref=ThisRef}, Index)
           when 
           is_integer(Index) ->
                              ?CLASS(ThisT,wxSizer),
                wxe_util:call(?wxSizer_GetItem_1,
                <<ThisRef:32/?UI,Index:32/?UI>>).

      %·%% GET ITEM / 3 %%·%
%%   
%%   Finds item of the sizer which holds given window, 
%%   sizer or is located in sizer at position index. Use parameter 
%%   recursive to search in subsizers too.
%%
%%   Returns pointer to item or NULL.  
%%   
%% Return Value:
%% See Also:
%%*%%*%%
          -spec getItem(This, Window, [Option]) -> wxSizerItem:wxSizerItem()
           when
           This    ::           wxSizer(), 
           Window  :: wxWindow:wxWindow() 
                    |           wxSizer(),
           Option  :: {recursive, boolean()}. 

getItem(#wx_ref{type=ThisT,ref=ThisRef},
        #wx_ref{type=WindowT,ref=WindowRef}, Options)
           when 
           is_list(Options) ->
                             ?CLASS(ThisT,wxSizer),
                    WindowOP = 
                             case 
                                ?CLASS_T(WindowT,wxWindow) 
                               of
                                 true ->
                                       ?wxSizer_GetItem_2_1;
                                    _ -> 
                                       ?CLASS(WindowT,wxSizer),
                                       ?wxSizer_GetItem_2_0
                             end,
                    MOpts =  fun({recursive, Recursive}, Acc) -> [<<1:32/?UI,(wxe_util:from_bool(Recursive)):32/?UI>>|Acc];
                                                (BadOpt, _) -> erlang:error({badoption, BadOpt})
                             end,
                    BinOpt = list_to_binary(lists:foldl(MOpts, [<<0:32>>], Options)),
                                         wxe_util:call(WindowOP,
                                         <<ThisRef:32/?UI,WindowRef:32/?UI, BinOpt/binary>>).







      %·%% GET SIZE %%·%
%%   
%%    Returns the current size of the sizer.
%%   
%% Return Value:
%% See Also:
%%*%%*%%
   "http://www.wxwidgets.org/manuals/2.8.12/wx_wxsizer.html#wxsizergetsize">external documentation</a>.
          -spec getSize(This) -> {W :: integer(),  H :: integer()}
           when
           This :: wxSizer(). 

getSize(#wx_ref{type=ThisT,ref=ThisRef}) ->
                                          ?CLASS(ThisT,wxSizer),
                            wxe_util:call(?wxSizer_GetSize,
                            <<ThisRef:32/?UI>>).





      %·%% GET POSITION %%·%
%%   
%%    Returns the current position of the sizer.
%%   
%% Return Value:
%% See Also:
%%*%%*%%
   "http://www.wxwidgets.org/manuals/2.8.12/wx_wxsizer.html#wxsizergetposition">external documentation</a>.
          -spec getPosition(This) -> {X :: integer(),  Y :: integer()}
           when
           This :: wxSizer(). 

getPosition(#wx_ref{type=ThisT,ref=ThisRef}) ->
                                              ?CLASS(ThisT,wxSizer),
                                wxe_util:call(?wxSizer_GetPosition,
                                <<ThisRef:32/?UI>>).





      %·%% GET MIN SIZE %%·%
%%   
%%   Returns the minimal size of the sizer. This is either the combined 
%%   minimal size of all the children and their borders or the minimal 
%%   size set by SetMinSize, depending on which is bigger.
%%
%%   Note that the returned value is client size, not window size. 
%%   In particular, if you use the value to set toplevel window's minimal 
%%   or actual size, you should convert it using wxWindow::ClientToWindowSize 
%%   before passing it to wxWindow::SetMinSize or wxWindow::SetSize.
%%   
%% Return Value:
%% See Also:
%%*%%*%%
          -spec getMinSize(This) -> {W :: integer(), H :: integer()}
           when
           This :: wxSizer(). 

getMinSize(#wx_ref{type=ThisT,ref=ThisRef}) ->
                                             ?CLASS(ThisT,wxSizer),
                               wxe_util:call(?wxSizer_GetMinSize,
                               <<ThisRef:32/?UI>>).





      %·%% HIDE %%·%
%%   
%% See also...
%% Return Value:
%% See Also:
%%*%%*%%

          -spec hide(This, Window) -> boolean()
           when
           This   ::           wxSizer(), 
           Window :: wxWindow:wxWindow() 
                   |          wxSizer();

      (This, Index) -> boolean()
           when
           This  :: wxSizer(), 
           Index :: integer(). 

hide(This,Window)
           when 
           is_record(This, wx_ref),
           is_record(Window, wx_ref) ->  hide(This,Window, []);


hide(#wx_ref{type=ThisT,ref=ThisRef},Index)
           when 
           is_integer(Index) ->
                              ?CLASS(ThisT,wxSizer),
                wxe_util:call(?wxSizer_Hide_1,
                <<ThisRef:32/?UI,Index:32/?UI>>).

      %·%% HIDE %%·%
%%   
%%   Hides the window, sizer, or item at index.  
%%   To make a sizer item disappear, use Hide() followed by Layout(). 
%%   Use parameter recursive to hide elements found in subsizers.
%%
%%   Returns true if the child item was found, false otherwise.
%%   
%% Return Value:
%% See Also: wxSizer::IsShown, wxSizer::Show
%%*%%*%%
          -spec hide(This, Window, [Option]) -> boolean()
           when
           This    ::              wxSizer(), 
           Window  ::    wxWindow:wxWindow() 
                    |              wxSizer(),
           Option  ::  {recursive, boolean()}. 

hide(#wx_ref{type=ThisT,ref=ThisRef},
     #wx_ref{type=WindowT,ref=WindowRef}, Options)
           when 
           is_list(Options) ->
                             ?CLASS(ThisT,wxSizer),
                    WindowOP = 
                             case 
                                ?CLASS_T(WindowT,wxWindow) 
                                of
                                   true ->
                                         ?wxSizer_Hide_2_1;
                                      _ -> 
                                         ?CLASS(WindowT,wxSizer),
                                         ?wxSizer_Hide_2_0
                             end,
                    MOpts =  fun({recursive, Recursive}, Acc) -> [<<1:32/?UI,(wxe_util:from_bool(Recursive)):32/?UI>>|Acc];
                                                 (BadOpt, _) -> erlang:error({badoption, BadOpt})
                             end,
                    BinOpt = list_to_binary(lists:foldl(MOpts, [<<0:32>>], Options)),
                                         wxe_util:call(WindowOP,
                                         <<ThisRef:32/?UI,WindowRef:32/?UI, BinOpt/binary>>).








      %·%% INSERT %%·%
%%   
%% See below...
%% Return Value:
%% See Also:
%%*%%*%%
          -spec insert(This, Index, Item) -> wxSizerItem:wxSizerItem()
           when
           This  ::                 wxSizer(), 
           Index ::                 integer(),  %% The position this child should assume in the sizer.
           Item  :: wxSizerItem:wxSizerItem(). 

insert(#wx_ref{type=ThisT,ref=ThisRef},
                                 Index,  
       #wx_ref{type=ItemT,ref=ItemRef})
           when 
           is_integer(Index) ->
                              ?CLASS(ThisT,wxSizer),
                              ?CLASS(ItemT,wxSizerItem),
                wxe_util:call(?wxSizer_Insert_2,
                <<ThisRef:32/?UI,Index:32/?UI,ItemRef:32/?UI>>).

      %·%% INSERT %%·%
%%   
%% See also...  
%% Return Value:
%% See Also:
%%*%%*%%
          -spec insert(This, Index, Width, Height)  -> wxSizerItem:wxSizerItem()
           when
           This   :: wxSizer(), 
           Index  :: integer(), % The position this child should assume in the sizer.
           Width  :: integer(), 
           Height :: integer();
    
                      (This, Index, Window, [Option]) -> wxSizerItem:wxSizerItem()
           when
           This    ::           wxSizer(), 
           Index   ::           integer(), %% The position this child should assume in the sizer. 
           Window  :: wxWindow:wxWindow() 
                    |           wxSizer(),
           Option  :: {proportion,    integer()}
                    | {flag,          integer()}
                    | {border,        integer()}
                    | {userData, wx:wx_object()};

                      (This, Index, Window, Flags) -> wxSizerItem:wxSizerItem()
           when
           This   ::                   wxSizer(), 
           Index  ::                   integer(), %% The position this child should assume in the sizer.
           Window ::         wxWindow:wxWindow() 
                   |                   wxSizer(), 
           Flags  :: wxSizerFlags:wxSizerFlags(). 


insert(This,Index,Width,Height)
           when 
           is_record(This, wx_ref),
           is_integer(Index),
           is_integer(Width),
           is_integer(Height)        ->     insert(This,Index,Width,Height, []);

insert(#wx_ref{type=ThisT,ref=ThisRef}, Index,
       #wx_ref{type=WindowT,ref=WindowRef},  Options)
           when 
           is_integer(Index),
           is_list(Options) ->
                             ?CLASS(ThisT,wxSizer),
                   WindowOP  = 
                             case 
                                ?CLASS_T(WindowT,wxWindow) 
                                of
                                   true ->
                                         ?wxSizer_Insert_3_1;
                                      _ -> 
                                         ?CLASS(WindowT,wxSizer),
                                         ?wxSizer_Insert_3_0
                              end,
                   MOpts  =   fun({proportion, Proportion}, Acc) -> [<<1:32/?UI,Proportion:32/?UI>>|Acc];
                                 ({flag,             Flag}, Acc) -> [<<2:32/?UI,Flag:32/?UI>>|Acc];
                                 ({border,         Border}, Acc) -> [<<3:32/?UI,Border:32/?UI>>|Acc];
                                 ({userData, #wx_ref{type=UserDataT,ref=UserDataRef}}, Acc) ->  ?CLASS(UserDataT,wx),[<<4:32/?UI,UserDataRef:32/?UI>>|Acc];
                                                     (BadOpt, _) -> erlang:error({badoption, BadOpt})
                              end,
                   BinOpt = list_to_binary(lists:foldl(MOpts, [<<0:32>>], Options)),
                                        wxe_util:call(WindowOP,
                                        <<ThisRef:32/?UI,Index:32/?UI,WindowRef:32/?UI, 0:32,BinOpt/binary>>);

insert(#wx_ref{type=ThisT,ref=ThisRef},Index,
       #wx_ref{type=WindowT,ref=WindowRef},
       #wx_ref{type=FlagsT,ref=FlagsRef})
           when 
           is_integer(Index)  ->
                               ?CLASS(ThisT,wxSizer),
                      WindowOP = 
                               case 
                                  ?CLASS_T(WindowT,wxWindow) 
                                  of
                                    true ->
                                          ?CLASS(FlagsT,wxSizerFlags),
                                          ?wxSizer_Insert_3_3;
                                       _ -> 
                                          ?CLASS(WindowT,wxSizer),
                                          ?CLASS(FlagsT,wxSizerFlags),
                                          ?wxSizer_Insert_3_2
                               end,
                               wxe_util:call(WindowOP,
                               <<ThisRef:32/?UI,Index:32/?UI,WindowRef:32/?UI,FlagsRef:32/?UI>>).

      %·%% INSERT %%·%
%%   
%% Insert a child into the sizer before any existing item at index.  
%% See wxSizer::Add for the meaning of the other parameters.
%%
%%  
%% Return Value:
%% See Also:
%%*%%*%%
          -spec insert(This, Index, Width, Height, [Option]) -> wxSizerItem:wxSizerItem()
           when
           This    :: wxSizer(), 
           Index   :: integer(), %% The position this child should assume in the sizer.
           Width   :: integer(), 
           Height  :: integer(),
           Option  :: {proportion,    integer()}
                    | {flag,          integer()}
                    | {border,        integer()}
                    | {userData, wx:wx_object()}. 

insert(#wx_ref{type=ThisT,ref=ThisRef}, Index, Width, Height, Options)
           when 
           is_integer(Index),
           is_integer(Width),
           is_integer(Height),
           is_list(Options) ->
                             ?CLASS(ThisT,wxSizer),
                   MOpts = fun({proportion, Proportion}, Acc) -> [<<1:32/?UI,Proportion:32/?UI>>|Acc];
                              ({flag,             Flag}, Acc) -> [<<2:32/?UI,Flag:32/?UI>>|Acc];
                              ({border,         Border}, Acc) -> [<<3:32/?UI,Border:32/?UI>>|Acc];
                              ({userData, #wx_ref{type=UserDataT,ref=UserDataRef}}, Acc) ->   ?CLASS(UserDataT,wx),[<<4:32/?UI,UserDataRef:32/?UI>>|Acc];
                                                  (BadOpt, _) -> erlang:error({badoption, BadOpt})
                           end,
                   BinOpt = list_to_binary(lists:foldl(MOpts, [<<0:32>>], Options)),
                                        wxe_util:call(?wxSizer_Insert_4,
                                        <<ThisRef:32/?UI,Index:32/?UI,Width:32/?UI,Height:32/?UI, BinOpt/binary>>).










      %·%% INSERT SPACER %%·%
%%   
%%   Inserts non-stretchable space to the sizer. 
%%   More readable way of calling Insert(size, size, 0).
%%   
%% Return Value:
%% See Also:
%%*%%*%%
          -spec insertSpacer(This, Index, Size) -> wxSizerItem:wxSizerItem()
           when
           This  :: wxSizer(), 
           Index :: integer(), 
           Size  :: integer(). 

insertSpacer(#wx_ref{type=ThisT,ref=ThisRef}, Index, Size)
           when 
           is_integer(Index),
           is_integer(Size) ->
                             ?CLASS(ThisT,wxSizer),
               wxe_util:call(?wxSizer_InsertSpacer,
               <<ThisRef:32/?UI,Index:32/?UI,Size:32/?UI>>).





      %·%% INSERT STRETCH SPACER %%·%
%%   
%% See below...
%% @equiv insertStretchSpacer(This,Index, [])
          -spec insertStretchSpacer(This, Index) -> wxSizerItem:wxSizerItem()
           when
           This  :: wxSizer(), 
           Index :: integer(). 


insertStretchSpacer(This,Index)
           when 
           is_record(This, wx_ref),
           is_integer(Index) -> insertStretchSpacer(This,Index, []).





      %·%% INSERT STRETCH SPACER %%·%
%%   
%%   Inserts stretchable space to the sizer. 
%%   More readable way of calling Insert(0, 0, prop).
%%   
%% Return Value:
%% See Also:
%%*%%*%%
          -spec insertStretchSpacer(This, Index, [Option]) -> wxSizerItem:wxSizerItem()
           when
           This    ::        wxSizer(), 
           Index   ::        integer(),
           Option  :: {prop, integer()}. 

insertStretchSpacer(#wx_ref{type=ThisT,ref=ThisRef}, Index, Options)
           when 
           is_integer(Index),
           is_list(Options) ->
                             ?CLASS(ThisT,wxSizer),
                   MOpts = fun({prop, Prop}, Acc) -> [<<1:32/?UI,Prop:32/?UI>>|Acc];
                                      (BadOpt, _) -> erlang:error({badoption, BadOpt})
                           end,
                   BinOpt = list_to_binary(lists:foldl(MOpts, [<<0:32>>], Options)),
                                        wxe_util:call(?wxSizer_InsertStretchSpacer,
                                        <<ThisRef:32/?UI,Index:32/?UI, BinOpt/binary>>).





      %·%% IS SHOWN %%·%
%%   
%%    Returns true if the window, sizer, or item at index is shown.
%%   
%% Return Value:
%% See Also: wxSizer::Hide, wxSizer::Show
%%*%%*%%
          -spec isShown(This, Index) -> boolean()
           when
           This  :: wxSizer(), 
           Index :: integer();
          
                       (This, Window) -> boolean()
           when
           This   ::           wxSizer(), 
           Window :: wxWindow:wxWindow() 
                   |           wxSizer(). 

isShown(#wx_ref{type=ThisT,ref=ThisRef}, Index)
           when 
           is_integer(Index) ->
                              ?CLASS(ThisT,wxSizer),
                wxe_util:call(?wxSizer_IsShown_1_0,
                <<ThisRef:32/?UI,Index:32/?UI>>);

isShown(#wx_ref{type=ThisT,ref=ThisRef},
        #wx_ref{type=WindowT,ref=WindowRef}) ->
                                              ?CLASS(ThisT,wxSizer),
                                     WindowOP = 
                                              case 
                                                 ?CLASS_T(WindowT,wxWindow)
                                                 of
                                                  true ->
                                                        ?wxSizer_IsShown_1_2;
                                                   _ -> 
                                                      ?CLASS(WindowT,wxSizer),
                                                      ?wxSizer_IsShown_1_1
                                              end,   
                                              wxe_util:call(WindowOP,
                                              <<ThisRef:32/?UI,WindowRef:32/?UI>>).






      %·%% LAYOUT %%·%
%%   
%%   Call this to force layout of the children anew,
%%   e.g. after having added a child to or removed a child (window, 
%%   other sizer or space) from the sizer while keeping the current dimension.
%%   
%% Return Value:
%% See Also:
%%*%%*%%
          -spec layout(This) -> ok
           when
           This :: wxSizer(). 

layout(#wx_ref{type=ThisT,ref=ThisRef}) ->
                                         ?CLASS(ThisT,wxSizer),
                           wxe_util:cast(?wxSizer_Layout,
                           <<ThisRef:32/?UI>>).







      %·%% PREPEND %%·%
%%   
%%   
%%   
%% Return Value:
%% See Also:
%%*%%*%%
          -spec prepend(This, Item) -> wxSizerItem:wxSizerItem()
           when
           This ::                 wxSizer(), 
           Item :: wxSizerItem:wxSizerItem(). 

prepend(#wx_ref{type=ThisT,ref=ThisRef},
        #wx_ref{type=ItemT,ref=ItemRef}) ->
                                          ?CLASS(ThisT,wxSizer),
                                          ?CLASS(ItemT,wxSizerItem),
                            wxe_util:call(?wxSizer_Prepend_1,
                            <<ThisRef:32/?UI,ItemRef:32/?UI>>).

      %·%% PREPEND %%·%
%%   
%%   
%%   
%% Return Value:
%% See Also:
%%*%%*%%
          -spec prepend(This, Width, Height) -> wxSizerItem:wxSizerItem()
           when
           This   :: wxSizer(), 
           Width  :: integer(), 
           Height :: integer();
      
                       (This, Window, [Option]) -> wxSizerItem:wxSizerItem()
           when
           This    ::           wxSizer(), 
           Window  :: wxWindow:wxWindow() 
                    |           wxSizer(),
           Option  :: {proportion, integer()}
                    | {flag, integer()}
                    | {border, integer()}
                    | {userData, wx:wx_object()};

                       (This, Window, Flags) -> wxSizerItem:wxSizerItem()
           when
           This   ::                   wxSizer(), 
           Window ::         wxWindow:wxWindow() 
                   |                   wxSizer(), 
           Flags  :: wxSizerFlags:wxSizerFlags(). 


prepend(This,Width,Height)
           when 
           is_record(This, wx_ref),
           is_integer(Width),
           is_integer(Height) ->  prepend(This,Width,Height, []);

prepend(#wx_ref{type=ThisT,ref=ThisRef},
        #wx_ref{type=WindowT,ref=WindowRef}, 
                                      Options)
           when 
           is_list(Options) ->
                             ?CLASS(ThisT,wxSizer),
                    WindowOP = 
                             case 
                                ?CLASS_T(WindowT,wxWindow)
                                of
                                   true ->
                                         ?wxSizer_Prepend_2_1;
                                      _ -> 
                                         ?CLASS(WindowT,wxSizer),
                                         ?wxSizer_Prepend_2_0
                                end,
                   MOpts = fun({proportion, Proportion}, Acc) -> [<<1:32/?UI,Proportion:32/?UI>>|Acc];
                              ({flag,             Flag}, Acc) -> [<<2:32/?UI,Flag:32/?UI>>|Acc];
                              ({border,         Border}, Acc) -> [<<3:32/?UI,Border:32/?UI>>|Acc];
                              ({userData, #wx_ref{type=UserDataT,ref=UserDataRef}}, Acc) -> ?CLASS(UserDataT,wx),[<<4:32/?UI,UserDataRef:32/?UI>>|Acc];
                                                  (BadOpt, _) -> erlang:error({badoption, BadOpt})
                           end,
                   BinOpt = list_to_binary(lists:foldl(MOpts, [<<0:32>>], Options)),
                                        wxe_util:call(WindowOP,
                                        <<ThisRef:32/?UI,WindowRef:32/?UI, BinOpt/binary>>);

prepend(#wx_ref{type=ThisT,ref=ThisRef},
        #wx_ref{type=WindowT,ref=WindowRef},
        #wx_ref{type=FlagsT,ref=FlagsRef}) ->
                                            ?CLASS(ThisT,wxSizer),
                                   WindowOP = 
                                            case 
                                               ?CLASS_T(WindowT,wxWindow) 
                                               of
                                                 true ->
                                                       ?CLASS(FlagsT,wxSizerFlags),
                                                       ?wxSizer_Prepend_2_3;
                                                    _ -> 
                                                       ?CLASS(WindowT,wxSizer),
                                                       ?CLASS(FlagsT,wxSizerFlags),
                                                       ?wxSizer_Prepend_2_2
                                            end,
                                            wxe_util:call(WindowOP,
                                            <<ThisRef:32/?UI,WindowRef:32/?UI,FlagsRef:32/?UI>>).

      %·%% PREPEND %%·%
%%   
%%   Same as wxSizer::Add, but prepends the items to the beginning of the 
%%   list of items (windows, subsizers or spaces) owned by this sizer.
%%   
%% Return Value:
%% See Also:
%%*%%*%%
          -spec prepend(This, Width, Height, [Option]) -> wxSizerItem:wxSizerItem()
           when
           This    :: wxSizer(), 
           Width   :: integer(), 
           Height  :: integer(),
           Option  :: {proportion,    integer()}
                    | {flag,          integer()}
                    | {border,        integer()}
                    | {userData, wx:wx_object()}. 

prepend(#wx_ref{type=ThisT,ref=ThisRef}, Width, Height, Options)
           when 
           is_integer(Width),
           is_integer(Height),
           is_list(Options) ->
                             ?CLASS(ThisT,wxSizer),
                   MOpts = fun({proportion, Proportion}, Acc) -> [<<1:32/?UI,Proportion:32/?UI>>|Acc];
                              ({flag,             Flag}, Acc) -> [<<2:32/?UI,Flag:32/?UI>>|Acc];
                              ({border,         Border}, Acc) -> [<<3:32/?UI,Border:32/?UI>>|Acc];
                              ({userData, #wx_ref{type=UserDataT,ref=UserDataRef}}, Acc)  ->  ?CLASS(UserDataT,wx),[<<4:32/?UI,UserDataRef:32/?UI>>|Acc];
                                                  (BadOpt, _) -> erlang:error({badoption, BadOpt})
                           end,
                   BinOpt = list_to_binary(lists:foldl(MOpts, [<<0:32>>], Options)),
                                        wxe_util:call(?wxSizer_Prepend_3,
                                        <<ThisRef:32/?UI,Width:32/?UI,Height:32/?UI, 0:32,BinOpt/binary>>).









      %·%% PREPEND SPACER %%·%
%%   
%%    Prepends non-stretchable space to the sizer. More readable way of calling Prepend(size, size, 0).
%%   
%% Return Value:
%% See Also:
%%*%%*%%
          -spec prependSpacer(This, Size) -> wxSizerItem:wxSizerItem()
           when
           This :: wxSizer(), 
           Size :: integer(). 

prependSpacer(#wx_ref{type=ThisT,ref=ThisRef}, Size)
           when 
           is_integer(Size) ->
                             ?CLASS(ThisT,wxSizer),
               wxe_util:call(?wxSizer_PrependSpacer,
               <<ThisRef:32/?UI,Size:32/?UI>>).





      %·%% PREPEND STRETCH SPACER / 1 %%·%
%%   
%% See below...
%% @equiv prependStretchSpacer(This, [])
          -spec prependStretchSpacer(This) -> wxSizerItem:wxSizerItem()
           when
           This :: wxSizer(). 


prependStretchSpacer(This)
           when 
           is_record(This, wx_ref) ->  prependStretchSpacer(This, []).

      %·%% PREPEND STRETCH SPACER / 2 %%·%
%%   
%%   Prepends stretchable space to the sizer. 
%%   More readable way of calling Prepend(0, 0, prop).
%%   
%% Return Value:
%% See Also:
%%*%%*%%
          -spec prependStretchSpacer(This, [Option]) -> wxSizerItem:wxSizerItem()
           when
           This    ::        wxSizer(),
           Option  :: {prop, integer()}. 

prependStretchSpacer(#wx_ref{type=ThisT,ref=ThisRef}, Options)
           when 
           is_list(Options) ->
                             ?CLASS(ThisT,wxSizer),
                   MOpts = fun({prop, Prop}, Acc) -> [<<1:32/?UI,Prop:32/?UI>>|Acc];
                                      (BadOpt, _) -> erlang:error({badoption, BadOpt})
                           end,
                   BinOpt = list_to_binary(lists:foldl(MOpts, [<<0:32>>], Options)),
                                        wxe_util:call(?wxSizer_PrependStretchSpacer,
                                        <<ThisRef:32/?UI, 0:32,BinOpt/binary>>).





      %·%% RECALC SIZES %%·%
%%   
%%   This method is abstract and has to be overwritten by any derived class. 
%%   Here, the sizer will do the actual calculation of its children's 
%%   positions and sizes.
%%   
%% Return Value:
%% See Also:
%%*%%*%%
          -spec recalcSizes(This) -> ok
           when
           This :: wxSizer(). 

recalcSizes(#wx_ref{type=ThisT,ref=ThisRef}) ->
                                              ?CLASS(ThisT,wxSizer),
                                wxe_util:cast(?wxSizer_RecalcSizes,
                                <<ThisRef:32/?UI>>).





      %·%% REMOVE %%·%
%%   
%%   Removes a child from the sizer and destroys it if it is a sizer or a spacer,
%%   but not if it is a window (because windows are owned by their parent window,
%%   not the sizer). sizer is the wxSizer to be removed, index is the position 
%%   of the child in the sizer, e.g. 0 for the first item. This method does 
%%   not cause any layout or resizing to take place, call wxSizer:Layout to 
%%   update the layout "on screen" after removing a child from the sizer.
%%   
%%   NB: The method taking a wxWindow* parameter is deprecated as it does 
%%   not destroy the window as would usually be expected from Remove. 
%%   You should use wxSizer::Detach in new code instead. 
%%   There is currently no wxSizer method that will both detach and 
%%   destroy a wxWindow item.
%%
%%   Returns true if the child item was found and removed, false otherwise.
%%   
%% Return Value:
%% See Also:
%%*%%*%%
          -spec remove(This, Index) -> boolean()
           when
           This  :: wxSizer(), 
           Index :: integer();
     
                      (This, Sizer) -> boolean()
           when
           This  :: wxSizer(), 
           Sizer :: wxSizer(). 

remove(#wx_ref{type=ThisT,ref=ThisRef}, Index)
           when 
           is_integer(Index) ->
                              ?CLASS(ThisT,wxSizer),
                wxe_util:call(?wxSizer_Remove_1_0,
                <<ThisRef:32/?UI,Index:32/?UI>>);

remove(#wx_ref{type=ThisT,ref=ThisRef},
       #wx_ref{type=SizerT,ref=SizerRef}) ->
                                           ?CLASS(ThisT,wxSizer),
                                           ?CLASS(SizerT,wxSizer),
                             wxe_util:call(?wxSizer_Remove_1_1,
                             <<ThisRef:32/?UI,SizerRef:32/?UI>>).





      %·%% REPLACE %%·%
%%   
%% See also... 
%% Return Value:
%% See Also:
%%*%%*%%
%% 
          -spec replace(This, Oldwin, Newwin) -> boolean()
           when
           This   ::           wxSizer(), 
           Oldwin :: wxWindow:wxWindow() 
                   |           wxSizer(), 
           Newwin :: wxWindow:wxWindow() 
                   |           wxSizer();
     
                       (This, Index, Newitem) -> boolean()
           when
           This    ::                 wxSizer(), 
           Index   ::                 integer(), 
           Newitem :: wxSizerItem:wxSizerItem(). 


replace(This, Oldwin, Newwin)
           when 
           is_record(This, wx_ref),
           is_record(Oldwin, wx_ref),
           is_record(Newwin, wx_ref) ->  replace(This,Oldwin,Newwin, []);

replace(#wx_ref{type=ThisT,ref=ThisRef},
                                     Index,
        #wx_ref{type=NewitemT,ref=NewitemRef})
           when 
           is_integer(Index) ->
                              ?CLASS(ThisT,wxSizer),
                              ?CLASS(NewitemT,wxSizerItem),
                wxe_util:call(?wxSizer_Replace_2,
                <<ThisRef:32/?UI,Index:32/?UI,NewitemRef:32/?UI>>).

      %·%% REPLACE %%·%
%%   
%%   Detaches the given oldwin, oldsz child from the sizer and replaces it with 
%%   the given window, sizer, or wxSizerItem.
%%
%%   The detached child is removed only if it is a sizer or a spacer 
%%   (because windows are owned by their parent window, not the sizer).
%%
%%   Use parameter recursive to search the given element 
%%   recursively in subsizers.
%%   
%%   This method does not cause any layout or resizing to take place, 
%%   call wxSizer::Layout to update the layout "on screen" after replacing a child from the sizer.
%%   
%%   Returns true if the child item was found and removed, false otherwise.
%% 
%% Return Value:
%% See Also:
%%*%%*%%
          -spec replace(This, Oldwin, Newwin, [Option]) -> boolean()
           when
           This    ::                       wxSizer(), 
           Oldwin  :: wxWindow:wxWindow() | wxSizer(), 
           Newwin  :: wxWindow:wxWindow() | wxSizer(),
           Option  :: {recursive, boolean()}. 

replace(#wx_ref{type=ThisT,ref=ThisRef},
        #wx_ref{type=OldwinT,ref=OldwinRef},
        #wx_ref{type=NewwinT,ref=NewwinRef},  Options)
           when 
           is_list(Options) ->
                             ?CLASS(ThisT,wxSizer),
                   OldwinOP  = 
                             case 
                                ?CLASS_T(OldwinT,wxWindow) 
                                of
                                  true ->
                                        ?CLASS(NewwinT,wxWindow),
                                        ?wxSizer_Replace_3_1;
                                     _ -> 
                                        ?CLASS(OldwinT,wxSizer),
                                        ?CLASS(NewwinT,wxSizer),
                                        ?wxSizer_Replace_3_0
                                     end,
                   MOpts = fun({recursive, Recursive}, Acc) -> [<<1:32/?UI,(wxe_util:from_bool(Recursive)):32/?UI>>|Acc];
                                                (BadOpt, _) -> erlang:error({badoption, BadOpt})
                           end,
                   BinOpt = list_to_binary(lists:foldl(MOpts, [<<0:32>>], Options)),
                                        wxe_util:call(OldwinOP,
                                        <<ThisRef:32/?UI,OldwinRef:32/?UI,NewwinRef:32/?UI, 0:32,BinOpt/binary>>).





      %·%% SET DIMENSION %%·%
%%   
%%   Call this to force the sizer to take the given dimension and thus 
%%   force the items owned by the sizer to resize themselves according 
%%   to the rules defined by the parameter in the Add and Prepend methods.
%%   
%% Return Value:
%% See Also:
%%*%%*%%
          -spec setDimension(This, X, Y, Width, Height) -> ok
           when
           This   :: wxSizer(), 
           X      :: integer(), 
           Y      :: integer(), 
           Width  :: integer(), 
           Height :: integer(). 

setDimension(#wx_ref{type=ThisT,ref=ThisRef}, X, Y, Width, Height)
           when 
           is_integer(X),
           is_integer(Y),
           is_integer(Width),
           is_integer(Height) ->
                               ?CLASS(ThisT,wxSizer),
                 wxe_util:cast(?wxSizer_SetDimension,
                 <<ThisRef:32/?UI,X:32/?UI,Y:32/?UI,Width:32/?UI,Height:32/?UI>>).






      %·%% SET MIN SIZE %%·%
%%   
%% Return Value:
%% See Also:
%%*%%*%%
          -spec setMinSize(This, Size) -> ok
           when
           This :: wxSizer(), 
           Size :: {W :: integer(), 
                    H :: integer()}. 

setMinSize(#wx_ref{type=ThisT,ref=ThisRef}, {SizeW, SizeH})
           when 
           is_integer(SizeW),
           is_integer(SizeH) ->
                              ?CLASS(ThisT,wxSizer),
                wxe_util:cast(?wxSizer_SetMinSize_1,
                <<ThisRef:32/?UI,SizeW:32/?UI,SizeH:32/?UI>>).

      %·%% SET MIN SIZE %%·%
%%   
%%   Call this to give the sizer a minimal size. 
%%   Normally, the sizer will calculate its minimal size based purely on how 
%%   much space its children need. After calling this method GetMinSize 
%%   will return either the minimal size as requested by its children or the minimal size set here, depending on which is bigger.
%%    
%%   
%% Return Value:
%% See Also:
%%*%%*%%
          -spec setMinSize(This, Width, Height) -> ok
           when
           This   :: wxSizer(), 
           Width  :: integer(), 
           Height :: integer(). 

setMinSize(#wx_ref{type=ThisT,ref=ThisRef}, Width, Height)
           when 
           is_integer(Width),
           is_integer(Height) ->
                               ?CLASS(ThisT,wxSizer),
                 wxe_util:cast(?wxSizer_SetMinSize_2,
                 <<ThisRef:32/?UI,Width:32/?UI,Height:32/?UI>>).








      %·%% SET ITEM MIN SIZE / 3 %%·%
%%   
%% See below...
%% Return Value:
%% See Also:
%%*%%*%%
          -spec setItemMinSize(This, Index, Size) -> boolean()
           when
           This  :: wxSizer(), 
           Index :: integer(), 
           Size  :: {W :: integer(), 
                     H :: integer()};
      
                              (This, Window, Size) -> boolean()
           when
           This   :: wxSizer(), 
           Window :: wxWindow:wxWindow() 
                   |           wxSizer(), 
           Size   :: {W :: integer(), 
                      H :: integer()}. 

setItemMinSize(#wx_ref{type=ThisT,ref=ThisRef}, Index, {SizeW, SizeH})
           when 
           is_integer(Index),
           is_integer(SizeW),
           is_integer(SizeH) ->
                              ?CLASS(ThisT,wxSizer),
                wxe_util:call(?wxSizer_SetItemMinSize_2_0,
                <<ThisRef:32/?UI,Index:32/?UI,SizeW:32/?UI,SizeH:32/?UI>>);

setItemMinSize(#wx_ref{type=ThisT,ref=ThisRef},
               #wx_ref{type=WindowT,ref=WindowRef},
                                        {SizeW, SizeH})
           when 
           is_integer(SizeW),
           is_integer(SizeH)  ->
                               ?CLASS(ThisT,wxSizer),
                      WindowOP = 
                               case 
                                  ?CLASS_T(WindowT,wxWindow) 
                                  of
                                    true ->
                                          ?wxSizer_SetItemMinSize_2_2;
                                       _ -> 
                                          ?CLASS(WindowT,wxSizer),
                                          ?wxSizer_SetItemMinSize_2_1
                                  end,
                                  wxe_util:call(WindowOP,
                                  <<ThisRef:32/?UI,WindowRef:32/?UI,SizeW:32/?UI,SizeH:32/?UI>>).

      %·%% SET ITEM MIN SIZE / 4 %%·%
%%   
%%   Set an item's minimum size by window, sizer, or position. 
%%   The item will be found recursively in the sizer's descendants. 
%%   This function enables an application to set the size of an item after initial creation.
%%   
%% Return Value:
%% See Also:
%%*%%*%%
          -spec setItemMinSize(This, Index, Width, Height) -> boolean()
           when
           This   :: wxSizer(), 
           Index  :: integer(), 
           Width  :: integer(), 
           Height :: integer();
      
                              (This, Window, Width, Height) -> boolean()
           when
           This   ::           wxSizer(), 
           Window :: wxWindow:wxWindow() 
                   |           wxSizer(), 
           Width  ::           integer(), 
           Height ::           integer(). 
 
setItemMinSize(#wx_ref{type=ThisT,ref=ThisRef}, Index, Width, Height)
           when 
           is_integer(Index),
           is_integer(Width),
           is_integer(Height) ->
                               ?CLASS(ThisT,wxSizer),
                 wxe_util:call(?wxSizer_SetItemMinSize_3_0,
                 <<ThisRef:32/?UI,Index:32/?UI,Width:32/?UI,Height:32/?UI>>);

setItemMinSize(#wx_ref{type=ThisT,ref=ThisRef},
               #wx_ref{type=WindowT,ref=WindowRef},
                                                 Width,
                                                    Height)
           when 
           is_integer(Width),
           is_integer(Height) ->
                               ?CLASS(ThisT,wxSizer),
                      WindowOP = 
                               case 
                                  ?CLASS_T(WindowT,wxWindow) 
                                  of
                                    true ->
                                          ?wxSizer_SetItemMinSize_3_2;
                                       _ -> 
                                          ?CLASS(WindowT,wxSizer),
                                          ?wxSizer_SetItemMinSize_3_1
                                  end,
                                  wxe_util:call(WindowOP,
                                  <<ThisRef:32/?UI,WindowRef:32/?UI,Width:32/?UI,Height:32/?UI>>).






      %·%% SET SIZE HINTS %%·%
%%   
%%   This method first calls wxSizer::Fit and then SetSizeHints on the 
%%   window passed to it. This only makes sense when window is actually 
%%   a wxTopLevelWindow such as a wxFrame or a wxDialog, since SetSizeHints 
%%   only has any effect in these classes. It does nothing in normal windows 
%%   or controls.
%%
%%   This method is commonly invoked in the constructor of a toplevel window 
%%   itself (see the sample in the description of wxBoxSizer) if the toplevel 
%%   window is resizable.
%%   
%% Return Value:
%% See Also:
%%*%%*%%
          -spec setSizeHints(This, Window) -> ok
           when
           This :: wxSizer(), 
           Window :: wxWindow:wxWindow(). 

setSizeHints(#wx_ref{type=ThisT,ref=ThisRef},
             #wx_ref{type=WindowT,ref=WindowRef}) ->
                                                   ?CLASS(ThisT,wxSizer),
                                                   ?CLASS(WindowT,wxWindow),
                                     wxe_util:cast(?wxSizer_SetSizeHints,
                                     <<ThisRef:32/?UI,WindowRef:32/?UI>>).





      %·%% SET VIRTUAL SIZE HINTS %%·%
%%   
%%   Tell the sizer to set the minimal size of the window virtual area to 
%%   match the sizer's minimal size. For windows with managed scrollbars 
%%   this will set them appropriately.
%%   
%% Return Value:
%% See Also: wxScrolledWindow::SetScrollbars
%%*%%*%%
          -spec setVirtualSizeHints(This, Window) -> ok
           when
           This   ::           wxSizer(), 
           Window :: wxWindow:wxWindow(). 

setVirtualSizeHints(#wx_ref{type=ThisT,ref=ThisRef}, 
                    #wx_ref{type=WindowT,ref=WindowRef}) ->
                                                          ?CLASS(ThisT,wxSizer),
                                                          ?CLASS(WindowT,wxWindow),
                                            wxe_util:cast(?wxSizer_SetVirtualSizeHints,
                                            <<ThisRef:32/?UI,WindowRef:32/?UI>>).





      %·%% SHOW %%·%
%%   
%% See below...  
%% Return Value:
%% See Also: wxSizer::Hide, wxSizer::IsShown 
%%*%%*%% 
          -spec show(This, Index) -> boolean()
           when
           This  :: wxSizer(), 
           Index :: integer();
     
                    (This, Window) -> boolean()
           when
           This   ::           wxSizer(), 
           Window :: wxWindow:wxWindow() 
                   |           wxSizer();
     
                    (This, Show) -> ok
           when
           This :: wxSizer(), 
           Show :: boolean(). 


show(This,Index)
           when 
           is_record(This, wx_ref),
           is_integer(Index) ->  show(This,Index, []);

show(This,Window)
           when 
           is_record(This, wx_ref),
           is_record(Window, wx_ref) ->  show(This,Window, []);

show(#wx_ref{type=ThisT,ref=ThisRef}, Show)
           when 
           is_boolean(Show) ->
                             ?CLASS(ThisT,wxSizer),
               wxe_util:cast(?wxSizer_Show_1,
               <<ThisRef:32/?UI,(wxe_util:from_bool(Show)):32/?UI>>).

      %·%% SHOW %%·%
%%   
%%   Shows or hides the window, sizer, or item at index. 
%%   To make a sizer item disappear or reappear, use Show() followed by Layout().
%%   Use parameter recursive to show or hide elements found in subsizers.
%%
%%   Returns true if the child item was found, false otherwise.   
%%   
%% Return Value:
%% See Also:
%%*%%*%%
          -spec show(This, Index, [Option]) -> boolean()
           when
           This    ::        wxSizer(), 
           Index   ::        integer(),
           Option  :: {show, boolean()};
    
                    (This, Window, [Option]) -> boolean()
           when
           This   ::           wxSizer(), 
           Window :: wxWindow:wxWindow() 
                   |           wxSizer(),
           Option :: {show,      boolean()}
                   | {recursive, boolean()}. 

show(#wx_ref{type=ThisT,ref=ThisRef}, Index, Options)
           when 
           is_integer(Index),
           is_list(Options) ->
                             ?CLASS(ThisT,wxSizer),
                   MOpts = fun({show, Show}, Acc) -> [<<1:32/?UI,(wxe_util:from_bool(Show)):32/?UI>>|Acc];
                                      (BadOpt, _) -> erlang:error({badoption, BadOpt})
                           end,
                   BinOpt = list_to_binary(lists:foldl(MOpts, [<<0:32>>], Options)),
                                        wxe_util:call(?wxSizer_Show_2_0,
                                        <<ThisRef:32/?UI,Index:32/?UI, BinOpt/binary>>);

show(#wx_ref{type=ThisT,ref=ThisRef},
     #wx_ref{type=WindowT,ref=WindowRef}, 
                                    Options)
           when 
           is_list(Options) ->
                             ?CLASS(ThisT,wxSizer),
                   WindowOP  = 
                             case
                                ?CLASS_T(WindowT,wxWindow) 
                                of
                                  true ->
                                        ?wxSizer_Show_2_2;
                                     _ ->
                                        ?CLASS(WindowT,wxSizer),
                                        ?wxSizer_Show_2_1
                                end,
                   MOpts = fun({show,           Show}, Acc) -> [<<1:32/?UI,(wxe_util:from_bool(Show)):32/?UI>>|Acc];
                              ({recursive, Recursive}, Acc) -> [<<2:32/?UI,(wxe_util:from_bool(Recursive)):32/?UI>>|Acc];
                                                (BadOpt, _) -> erlang:error({badoption, BadOpt})
                           end,
                   BinOpt = list_to_binary(lists:foldl(MOpts, [<<0:32>>], Options)),
                                        wxe_util:call(WindowOP,
                                        <<ThisRef:32/?UI,WindowRef:32/?UI, BinOpt/binary>>).


%%   ---------------------------------SIZER OVERVIEW---------------------------------
%%   
%%   Classes: wxSizer, 
%%            wxGridSizer, 
%%            wxFlexGridSizer,
%%            wxBoxSizer, 
%%            wxStaticBoxSizer,
%%   
%%   GOOD PICS &
%%     SOURCE LINK — http://docs.wxwidgets.org/2.8.12/wx_sizeroverview.html
%%
%%   Sizers, as represented by the wxSizer class and its descendants in the wxWidgets 
%%   class hierarchy, have become the method of choice to define the layout of controls 
%%   in dialogs in wxWidgets because of their ability to create visually appealing
%%   dialogs independent of the platform, taking into account the differences in size 
%%   and style of the individual controls. Unlike the original wxWidgets Dialog Editor,
%%   editors such as wxDesigner, DialogBlocks, XRCed and wxWorkshop create dialogs 
%%   based exclusively on sizers, practically forcing the user to create platform 
%%   independent layouts without compromises.
%%   
%%   The next section describes and shows what can be done with sizers. 
%%   The following sections briefly describe how to program with 
%%   individual sizer classes.
%%   
%%   For information about the new wxWidgets resource system, 
%%   which can describe sizer-based dialogs, see the XML-based 
%%   resource system overview.
%%   
%%   SIZER TOPICS
%%   ————————————
%%   1 · The idea behind sizers
%%   2 · Common Features
%%   3 · Hiding controls using sizers
%%   4 · Programming with wxBoxSizer
%%   5 · Programming with wxGridSizer
%%   6 · Programming with wxFlexGridSizer
%%   7 · Programming with wxStaticBoxSizer
%%   
%%   (1)— THE IDEA BEHIND SIZERS -(1)
%%   
%%   The layout algorithm used by sizers in wxWidgets is closely related to layout 
%%   systems in other GUI toolkits, such as Java's AWT, the GTK toolkit or the 
%%   Qt toolkit. It is based upon the idea of individual subwindows reporting 
%%   their minimal required size and their ability to get stretched if the size 
%%   of the parent window has changed. This will most often mean that the 
%%   programmer does not set the start-up size of a dialog, the dialog will 
%%   rather be assigned a sizer and this sizer will be queried about the 
%%   recommended size. This sizer in turn will query its children (which can 
%%   be normal windows, empty space or other sizers) so that a hierarchy of sizers 
%%   can be constructed. Note that wxSizer does not derive from wxWindow and thus 
%%   does not interfere with tab ordering and requires very few resources compared
%%   to a real window on screen.
%%   
%%   What makes sizers so well fitted for use in wxWidgets is the fact that every
%%   control reports its own minimal size and the algorithm can handle differences 
%%   in font sizes or different window (dialog item) sizes 
%%   on different platforms without problems. 
%%   For example, if the standard font as well as the overall design of 
%%   Linux/GTK widgets requires more space than on Windows, the initial 
%%   dialog size will automatically be bigger on Linux/GTK than on Windows.
%%   
%%   There are currently five different kinds of sizers available in wxWidgets. 
%%   Each represents either a certain way to lay out dialog items in a dialog 
%%   or it fulfills a special task such as wrapping a static box around a dialog 
%%   item (or another sizer). These sizers will be discussed one by one in the 
%%   text below. For more detailed information on how to use sizers 
%%   programmatically, please refer to the section Programming with Sizers.
%%   
%%   
%%
%%   (2)—COMMON FEATURES-(2)
%%
%%   All sizers are containers, that is, 
%%   they are used to lay out one dialog item (or several dialog items), 
%%   which they contain. Such items are sometimes referred to as the children 
%%   of the sizer. Independent of how the individual sizers lay out their children, 
%%   all children have certain features in common:
%%
%%    · A minimal size: 
%%          This minimal size is usually identical to the initial size of the 
%%          controls and may either be set explicitly in the wxSize field of 
%%          the control constructor or may be calculated by wxWidgets, typically 
%%          by setting the height and/or the width of the item to -1. 
%%          Note that only some controls can calculate their size (such as a 
%%          checkbox) whereas others (such as a listbox) don't have any natural 
%%          width or height and thus require an explicit size. Some controls can 
%%          calculate their height, but not their width 
%%          (e.g. a single line text control)
%%
%%    · A border: 
%%          The border is just empty space and is used to separate dialog 
%%          items in a dialog. This border can either be all around, or at 
%%          any combination of sides such as only above and below the control. 
%%          The thickness of this border must be set explicitly, 
%%          typically 5 points. The following samples show dialogs with 
%%          only one dialog item (a button) and a border of 0, 5, and 10 pixels 
%%          around the button.
%%
%%    · An alignment: 
%%          Often, a dialog item is given more space than its minimal size plus its 
%%          border. Depending on what flags are used for the respective dialog item, 
%%          the dialog item can be made to fill out the available space entirely, 
%%          i.e. it will grow to a size larger than the minimal size, 
%%          or it will be moved to either the centre of the available space or 
%%          to either side of the space. The following sample shows a listbox and 
%%          three buttons in a horizontal box sizer; one button is centred, 
%%          one is aligned at the top, one is aligned at the bottom.
%%
%%    · A stretch factor:
%%          If a sizer contains more than one child and it is offered more space 
%%          than its children and their borders need, the question arises how to 
%%          distribute the surplus space among the children. 
%%          For this purpose, a stretch factor may be assigned to each child, 
%%          where the default value of 0 indicates that the child will not get 
%%          more space than its requested minimum size. A value of more than zero 
%%          is interpreted in relation to the sum of all stretch factors in the 
%%          children of the respective sizer, i.e. if two children get a stretch 
%%          factor of 1, they will get half the extra space each independent of 
%%          whether one control has a minimal sizer inferior to the other or not. 
%%          The following sample shows a dialog with three buttons, the first one 
%%          has a stretch factor of 1 and thus gets stretched, whereas the other 
%%          two buttons have a stretch factor of zero and keep their initial width.
%%
%%          Within wxDesigner, this stretch factor gets set from the Option menu.
%%
%%   (3)—HIDING CONTROLS USING SIZERS-(3)  
%%
%%   You can hide controls contained in sizers the same way you would hide any 
%%   control, using the wxWindow:Show method.
%%
%%   However, wxSizer also offers a separate method which can tell the sizer not 
%%   to consider that control in its size calculations. To hide a window using 
%%   the sizer, call wxSizer::Show. You must then call Layout on the sizer to 
%%   force an update.
%%
%%   This is useful when hiding parts of the interface, since you can avoid 
%%   removing the controls from the sizer and having to add them back later.
%%
%%   Note: This is supported only by wxBoxSizer and wxFlexGridSizer.
%%
%%
%%   + wxBoxSizer
%%
%%      wxBoxSizer can lay out its children either vertically or horizontally, 
%%      depending on what flag is being used in its constructor. When using a 
%%      vertical sizer, each child can be centered, aligned to the right or aligned 
%%      to the left. Correspondingly, when using a horizontal sizer, each child 
%%      can be centered, aligned at the bottom or aligned at the top. 
%%      The stretch factor described in the last paragraph is used for 
%%      the main orientation, i.e. when using a horizontal box sizer, 
%%      the stretch factor determines how much the child can be stretched horizontally. 
%%      The following sample shows the same dialog as in the last sample, 
%%      only the box sizer is a vertical box sizer now.
%%
%%
%%   + wxStaticBoxSizer
%%
%%      wxStaticBoxSixer is the same as a wxBoxSizer, but surrounded by a static box. 
%%      Here is a sample:
%%
%%
%%   + wxGridSizer
%%
%%      wxGridSizer is a two-dimensional sizer. All children are given the same size, 
%%      which is the minimal size required by the biggest child, in this case the text 
%%      control in the left bottom border. Either the number of columns or the 
%%      number or rows is fixed and the grid sizer will grow in the 
%%      respectively other orientation if new children are added.
%%      
%%      For programming information, see wxGridSizer.
%%      
%%
%%   + wxFlexGridSizer
%%      
%%      Another two-dimensional sizer derived from wxGridSizer. 
%%      The width of each column and the height of each row are calculated 
%%      individually according to the minimal requirements from the respectively 
%%      biggest child. Additionally, columns and rows can be declared to be 
%%      stretchable if the sizer is assigned a size different from the one it 
%%      requested. The following sample shows the same dialog as the one above, 
%%      but using a flex grid sizer:
%%    
%%  
%%   (4)—PROGRAMMING WITH WXBOXSIZER-(4)
%%
%%   The basic idea behind a wxBoxSizer is that windows will most often be 
%%   laid out in rather simple basic geometry, typically in a row or a column 
%%   or several hierarchies of either.
%%   
%%   As an example, we will construct a dialog that will contain a text field
%%    at the top and two buttons at the bottom. This can be seen as a top-hierarchy 
%%   lumn with the text at the top and buttons at the bottom and a low-hierarchy 
%%   row with an OK button to the left and a Cancel button to the right. 
%%   In many cases (particularly dialogs under Unix and normal frames) the main 
%%   window will be resizable by the user and this change of size will have to 
%%   get propagated to its children. In our case, we want the text area to grow 
%%   with the dialog, whereas the button shall have a fixed size. 
%%   In addition, there will be a thin border around all controls to make the 
%%   dialog look nice and - to make matter worse - the buttons shall be centred 
%%   as the width of the dialog changes.
%%   
%%   It is the unique feature of a box sizer, that it can grow in both 
%%   directions (height and width) but can distribute its growth in the main 
%%   direction (horizontal for a row) unevenly among its children. 
%%   In our example case, the vertical sizer is supposed to propagate all 
%%   its height changes to only the text area, not to the button area. 
%%   This is determined by the proportion parameter when adding a window 
%%   (or another sizer) to a sizer. It is interpreted as a weight factor, 
%%   i.e. it can be zero, indicating that the window may not be resized at all, 
%%   or above zero. If several windows have a value above zero, 
%%   the value is interpreted relative to the sum of all weight 
%%   factors of the sizer, so when adding two windows with a value of 1, 
%%   they will both get resized equally much and each half as much as the sizer owning them. Then what do we do when a column sizer changes its width? This behaviour is controlled by flags (the second parameter of the Add() function): Zero or no flag indicates that the window will preserve it is original size, wxGROW flag (same as wxEXPAND) forces the window to grow with the sizer, and wxSHAPED flag tells the window to change it is size proportionally, preserving original aspect ratio. When wxGROW flag is not used, the item can be aligned within available space. wxALIGN_LEFT, wxALIGN_TOP, wxALIGN_RIGHT, wxALIGN_BOTTOM, wxALIGN_CENTER_HORIZONTAL and wxALIGN_CENTER_VERTICAL do what they say. wxALIGN_CENTRE (same as wxALIGN_CENTER) is defined as (wxALIGN_CENTER_HORIZONTAL | wxALIGN_CENTER_VERTICAL). Default alignment is wxALIGN_LEFT | wxALIGN_TOP.
%%   
%%   As mentioned above, any window belonging to a sizer may have border, 
%%   and it can be specified which of the four sides may have this border, 
%%   using the wxTOP, wxLEFT, wxRIGHT and wxBOTTOM constants or wxALL for 
%%   all directions (and you may also use wxNORTH, wxWEST etc instead). 
%%   These flags can be used in combination with the alignment flags 
%%   above as the second parameter of the Add() method using the binary 
%%   or operator |. The sizer of the border also must be made known, 
%%   and it is the third parameter in the Add() method. This means, 
%%   that the entire behaviour of a sizer and its children can be 
%%   controlled by the three parameters of the Add() method.
%%   
%%   FOR A C++ example see the following link. 
%%   
%%   
%%   
%%   (5)—PROGRAMMING WITH WXGRIDSIZER-(5)
%%
%%   wxGridSizer is a sizer which lays out its children in a two-dimensional 
%%   table with all table fields having the same size, i.e. the width of each 
%%   field is the width of the widest child, the height of each field is the 
%%   height of the tallest child.
%%   
%%   (6)—PROGRAMMING WITH WXFLEXGRIDSIZER-(6)
%%   
%%   wxFlexGridSizer is a sizer which lays out its children in a two-dimensional 
%%   table with all table fields in one row having the same height and all fields 
%%   in one column having the same width, but all rows or all columns are not 
%%   necessarily the same height or width as in the wxGridSizer.
%%   
%%   (7)—PROGRAMMING WITH WXSTATICBOXSIZER-(7)
%%   
%%   wxStaticBoxSizer is a sizer derived from wxBoxSizer but adds a static box 
%%   around the sizer. Note that this static box has to be created separately.
%%