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%% This file is generated DO NOT EDIT

-module(wxSizer).
-moduledoc """
`m:wxSizer` is the abstract base class used for laying out subwindows in a window.

You cannot use `m:wxSizer` directly; instead, you will have to use one of the sizer
classes derived from it. Currently there are `m:wxBoxSizer`, `m:wxStaticBoxSizer`, `m:wxGridSizer`, `m:wxFlexGridSizer`, `wxWrapSizer`
(not implemented in wx) and `m: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 `m:wxSizer` does not derive from `m: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/4`, `insert/5`,
and `prepend/4` functions return a pointer to the newly added `m:wxSizerItem`. Just add empty space
of the desired size and attributes, and then use the `wxSizerItem:getRect/1` 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.

wxSizer flags

The "flag" argument accepted by `m:wxSizerItem` constructors and other functions, e.g. `add/4`,
is an OR-combination of the following flags. 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.

See: [Overview sizer](https://docs.wxwidgets.org/3.2/overview_sizer.html#overview_sizer)

wxWidgets docs: [wxSizer](https://docs.wxwidgets.org/3.2/classwx_sizer.html)
""".
-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/3,setDimension/5,setItemMinSize/3,setItemMinSize/4,setMinSize/2,
  setMinSize/3,setSizeHints/2,setVirtualSizeHints/2,show/2,show/3,showItems/2]).

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

-type wxSizer() :: wx:wx_object().
-export_type([wxSizer/0]).
-doc false.
parent_class(_Class) -> erlang:error({badtype, ?MODULE}).

-doc(#{equiv => add(This,Window, [])}).
-spec add(This, Window) -> wxSizerItem:wxSizerItem() when
	This::wxSizer(), Window::wxWindow:wxWindow() | wxSizer:wxSizer().

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

-doc """
Appends a child to the sizer.

`m: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:
""".
-spec add(This, Width, Height) -> wxSizerItem:wxSizerItem() when
	This::wxSizer(), Width::integer(), Height::integer();
      (This, Window, Flags) -> wxSizerItem:wxSizerItem() when
	This::wxSizer(), Window::wxWindow:wxWindow() | wxSizer:wxSizer(), Flags::wxSizerFlags:wxSizerFlags();
      (This, Window, [Option]) -> wxSizerItem:wxSizerItem() when
	This::wxSizer(), Window::wxWindow:wxWindow() | wxSizer:wxSizer(),
	Option :: {'proportion', integer()}
		 | {'flag', integer()}
		 | {'border', integer()}
		 | {'userData', wx:wx_object()}.

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}=This,#wx_ref{type=WindowT}=Window,#wx_ref{type=FlagsT}=Flags) ->
  ?CLASS(ThisT,wxSizer),
  IswxWindow = ?CLASS_T(WindowT,wxWindow),
  IswxSizer = ?CLASS_T(WindowT,wxSizer),
  WindowType = if
    IswxWindow ->   ?CLASS(FlagsT,wxSizerFlags),   wxWindow;
    IswxSizer ->   ?CLASS(FlagsT,wxSizerFlags),   wxSizer;
    true -> error({badarg, WindowT})
  end,
  ?CLASS(FlagsT,wxSizerFlags),
  wxe_util:queue_cmd(This,wx:typeCast(Window, WindowType),Flags,?get_env(),?wxSizer_Add_2_0),
  wxe_util:rec(?wxSizer_Add_2_0);
add(#wx_ref{type=ThisT}=This,#wx_ref{type=WindowT}=Window, Options)
 when is_list(Options) ->
  ?CLASS(ThisT,wxSizer),
  IswxWindow = ?CLASS_T(WindowT,wxWindow),
  IswxSizer = ?CLASS_T(WindowT,wxSizer),
  WindowType = if
    IswxWindow ->   wxWindow;
    IswxSizer ->   wxSizer;
    true -> error({badarg, WindowT})
  end,
  MOpts = fun({proportion, _proportion} = Arg) -> Arg;
          ({flag, _flag} = Arg) -> Arg;
          ({border, _border} = Arg) -> Arg;
          ({userData, #wx_ref{type=UserDataT}} = Arg) ->   ?CLASS(UserDataT,wx),Arg;
          (BadOpt) -> erlang:error({badoption, BadOpt}) end,
  Opts = lists:map(MOpts, Options),
  wxe_util:queue_cmd(This,wx:typeCast(Window, WindowType), Opts,?get_env(),?wxSizer_Add_2_1),
  wxe_util:rec(?wxSizer_Add_2_1).

-doc "Appends a spacer child to the sizer.".
-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()};
      (This, Width, Height, Flags) -> wxSizerItem:wxSizerItem() when
	This::wxSizer(), Width::integer(), Height::integer(), Flags::wxSizerFlags:wxSizerFlags().
add(#wx_ref{type=ThisT}=This,Width,Height, Options)
 when is_integer(Width),is_integer(Height),is_list(Options) ->
  ?CLASS(ThisT,wxSizer),
  MOpts = fun({proportion, _proportion} = Arg) -> Arg;
          ({flag, _flag} = Arg) -> Arg;
          ({border, _border} = Arg) -> Arg;
          ({userData, #wx_ref{type=UserDataT}} = Arg) ->   ?CLASS(UserDataT,wx),Arg;
          (BadOpt) -> erlang:error({badoption, BadOpt}) end,
  Opts = lists:map(MOpts, Options),
  wxe_util:queue_cmd(This,Width,Height, Opts,?get_env(),?wxSizer_Add_3_0),
  wxe_util:rec(?wxSizer_Add_3_0);
add(#wx_ref{type=ThisT}=This,Width,Height,#wx_ref{type=FlagsT}=Flags)
 when is_integer(Width),is_integer(Height) ->
  ?CLASS(ThisT,wxSizer),
  ?CLASS(FlagsT,wxSizerFlags),
  wxe_util:queue_cmd(This,Width,Height,Flags,?get_env(),?wxSizer_Add_3_1),
  wxe_util:rec(?wxSizer_Add_3_1).

-doc """
This base function adds non-stretchable space to both the horizontal and vertical
orientation of the sizer.

More readable way of calling:

See: `addSpacer/2`
""".
-spec addSpacer(This, Size) -> wxSizerItem:wxSizerItem() when
	This::wxSizer(), Size::integer().
addSpacer(#wx_ref{type=ThisT}=This,Size)
 when is_integer(Size) ->
  ?CLASS(ThisT,wxSizer),
  wxe_util:queue_cmd(This,Size,?get_env(),?wxSizer_AddSpacer),
  wxe_util:rec(?wxSizer_AddSpacer).

-doc(#{equiv => addStretchSpacer(This, [])}).
-spec addStretchSpacer(This) -> wxSizerItem:wxSizerItem() when
	This::wxSizer().

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

-doc """
Adds stretchable space to the sizer.

More readable way of calling:
""".
-spec addStretchSpacer(This, [Option]) -> wxSizerItem:wxSizerItem() when
	This::wxSizer(),
	Option :: {'prop', integer()}.
addStretchSpacer(#wx_ref{type=ThisT}=This, Options)
 when is_list(Options) ->
  ?CLASS(ThisT,wxSizer),
  MOpts = fun({prop, _prop} = Arg) -> Arg;
          (BadOpt) -> erlang:error({badoption, BadOpt}) end,
  Opts = lists:map(MOpts, Options),
  wxe_util:queue_cmd(This, Opts,?get_env(),?wxSizer_AddStretchSpacer),
  wxe_util:rec(?wxSizer_AddStretchSpacer).

-doc """
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 minimal sizes.
""".
-spec calcMin(This) -> {W::integer(), H::integer()} when
	This::wxSizer().
calcMin(#wx_ref{type=ThisT}=This) ->
  ?CLASS(ThisT,wxSizer),
  wxe_util:queue_cmd(This,?get_env(),?wxSizer_CalcMin),
  wxe_util:rec(?wxSizer_CalcMin).

-doc(#{equiv => clear(This, [])}).
-spec clear(This) -> 'ok' when
	This::wxSizer().

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

-doc """
Detaches all children from the sizer.

If `delete_windows` is true then child windows will also be deleted.

Notice that child sizers are always deleted, as a general consequence of the principle
that sizers own their sizer children, but don't own their window children (because they
are already owned by their parent windows).
""".
-spec clear(This, [Option]) -> 'ok' when
	This::wxSizer(),
	Option :: {'delete_windows', boolean()}.
clear(#wx_ref{type=ThisT}=This, Options)
 when is_list(Options) ->
  ?CLASS(ThisT,wxSizer),
  MOpts = fun({delete_windows, _delete_windows} = Arg) -> Arg;
          (BadOpt) -> erlang:error({badoption, BadOpt}) end,
  Opts = lists:map(MOpts, Options),
  wxe_util:queue_cmd(This, Opts,?get_env(),?wxSizer_Clear).

-doc """
Detach a item at position `index` from the sizer without destroying it.

This method does not cause any layout or resizing to take place, call `layout/1` 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.

See: `remove/2`
""".
-spec detach(This, Window) -> boolean() when
	This::wxSizer(), Window::wxWindow:wxWindow() | wxSizer:wxSizer();
      (This, Index) -> boolean() when
	This::wxSizer(), Index::integer().
detach(#wx_ref{type=ThisT}=This,#wx_ref{type=WindowT}=Window) ->
  ?CLASS(ThisT,wxSizer),
  IswxWindow = ?CLASS_T(WindowT,wxWindow),
  IswxSizer = ?CLASS_T(WindowT,wxSizer),
  WindowType = if
    IswxWindow ->   wxWindow;
    IswxSizer ->   wxSizer;
    true -> error({badarg, WindowT})
  end,
  wxe_util:queue_cmd(This,wx:typeCast(Window, WindowType),?get_env(),?wxSizer_Detach_1_0),
  wxe_util:rec(?wxSizer_Detach_1_0);
detach(#wx_ref{type=ThisT}=This,Index)
 when is_integer(Index) ->
  ?CLASS(ThisT,wxSizer),
  wxe_util:queue_cmd(This,Index,?get_env(),?wxSizer_Detach_1_1),
  wxe_util:rec(?wxSizer_Detach_1_1).

-doc """
Tell the sizer to resize the `window` so that its client area matches the sizer's minimal
size (`ComputeFittingClientSize()` (not implemented in wx) is called to determine it).

This is commonly done in the constructor of the window itself, see sample in the
description of `m:wxBoxSizer`.

Return: The new window size.
""".
-spec fit(This, Window) -> {W::integer(), H::integer()} when
	This::wxSizer(), Window::wxWindow:wxWindow().
fit(#wx_ref{type=ThisT}=This,#wx_ref{type=WindowT}=Window) ->
  ?CLASS(ThisT,wxSizer),
  ?CLASS(WindowT,wxWindow),
  wxe_util:queue_cmd(This,Window,?get_env(),?wxSizer_Fit),
  wxe_util:rec(?wxSizer_Fit).

-doc "Equivalent to: `fitInside/2`".
-spec setVirtualSizeHints(This, Window) -> 'ok' when
	This::wxSizer(), Window::wxWindow:wxWindow().

setVirtualSizeHints(This,Window)
 when is_record(This, wx_ref),is_record(Window, wx_ref) ->
  fitInside(This,Window).

-doc """
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.

See:
* `wxScrolledWindow:setScrollbars/6`

* `setVirtualSizeHints/2`
""".
-spec fitInside(This, Window) -> 'ok' when
	This::wxSizer(), Window::wxWindow:wxWindow().
fitInside(#wx_ref{type=ThisT}=This,#wx_ref{type=WindowT}=Window) ->
  ?CLASS(ThisT,wxSizer),
  ?CLASS(WindowT,wxWindow),
  wxe_util:queue_cmd(This,Window,?get_env(),?wxSizer_FitInside).

-doc "".
-spec getChildren(This) -> [wxSizerItem:wxSizerItem()] when
	This::wxSizer().
getChildren(#wx_ref{type=ThisT}=This) ->
  ?CLASS(ThisT,wxSizer),
  wxe_util:queue_cmd(This,?get_env(),?wxSizer_GetChildren),
  wxe_util:rec(?wxSizer_GetChildren).

-doc """
Finds `m:wxSizerItem` which is located in the sizer at position `index`.

Use parameter `recursive` to search in subsizers too. Returns pointer to item or NULL.
""".
-spec getItem(This, Window) -> wxSizerItem:wxSizerItem() when
	This::wxSizer(), Window::wxWindow:wxWindow() | wxSizer: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}=This,Index)
 when is_integer(Index) ->
  ?CLASS(ThisT,wxSizer),
  wxe_util:queue_cmd(This,Index,?get_env(),?wxSizer_GetItem_1),
  wxe_util:rec(?wxSizer_GetItem_1).

-doc """
Finds `m:wxSizerItem` which holds the given `window`.

Use parameter `recursive` to search in subsizers too. Returns pointer to item or NULL.
""".
-spec getItem(This, Window, [Option]) -> wxSizerItem:wxSizerItem() when
	This::wxSizer(), Window::wxWindow:wxWindow() | wxSizer:wxSizer(),
	Option :: {'recursive', boolean()}.
getItem(#wx_ref{type=ThisT}=This,#wx_ref{type=WindowT}=Window, Options)
 when is_list(Options) ->
  ?CLASS(ThisT,wxSizer),
  IswxWindow = ?CLASS_T(WindowT,wxWindow),
  IswxSizer = ?CLASS_T(WindowT,wxSizer),
  WindowType = if
    IswxWindow ->   wxWindow;
    IswxSizer ->   wxSizer;
    true -> error({badarg, WindowT})
  end,
  MOpts = fun({recursive, _recursive} = Arg) -> Arg;
          (BadOpt) -> erlang:error({badoption, BadOpt}) end,
  Opts = lists:map(MOpts, Options),
  wxe_util:queue_cmd(This,wx:typeCast(Window, WindowType), Opts,?get_env(),?wxSizer_GetItem_2),
  wxe_util:rec(?wxSizer_GetItem_2).

-doc "Returns the current size of the sizer.".
-spec getSize(This) -> {W::integer(), H::integer()} when
	This::wxSizer().
getSize(#wx_ref{type=ThisT}=This) ->
  ?CLASS(ThisT,wxSizer),
  wxe_util:queue_cmd(This,?get_env(),?wxSizer_GetSize),
  wxe_util:rec(?wxSizer_GetSize).

-doc "Returns the current position of the sizer.".
-spec getPosition(This) -> {X::integer(), Y::integer()} when
	This::wxSizer().
getPosition(#wx_ref{type=ThisT}=This) ->
  ?CLASS(ThisT,wxSizer),
  wxe_util:queue_cmd(This,?get_env(),?wxSizer_GetPosition),
  wxe_util:rec(?wxSizer_GetPosition).

-doc """
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/3`, 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, use `wxWindow::SetMinClientSize()` (not implemented in wx) or `wxWindow:setClientSize/3`,
not `wxWindow:setMinSize/2` or `wxWindow:setSize/6`.
""".
-spec getMinSize(This) -> {W::integer(), H::integer()} when
	This::wxSizer().
getMinSize(#wx_ref{type=ThisT}=This) ->
  ?CLASS(ThisT,wxSizer),
  wxe_util:queue_cmd(This,?get_env(),?wxSizer_GetMinSize),
  wxe_util:rec(?wxSizer_GetMinSize).

-doc """
Hides the item at position `index`.

To make a sizer item disappear, use `hide/3` followed by `layout/1`.

Use parameter `recursive` to hide elements found in subsizers. Returns true if the child
item was found, false otherwise.

See:
* `isShown/2`

* `show/3`
""".
-spec hide(This, Window) -> boolean() when
	This::wxSizer(), Window::wxWindow:wxWindow() | wxSizer: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}=This,Index)
 when is_integer(Index) ->
  ?CLASS(ThisT,wxSizer),
  wxe_util:queue_cmd(This,Index,?get_env(),?wxSizer_Hide_1),
  wxe_util:rec(?wxSizer_Hide_1).

-doc """
Hides the child `window`.

To make a sizer item disappear, use `hide/3` followed by `layout/1`.

Use parameter `recursive` to hide elements found in subsizers. Returns true if the child
item was found, false otherwise.

See:
* `isShown/2`

* `show/3`
""".
-spec hide(This, Window, [Option]) -> boolean() when
	This::wxSizer(), Window::wxWindow:wxWindow() | wxSizer:wxSizer(),
	Option :: {'recursive', boolean()}.
hide(#wx_ref{type=ThisT}=This,#wx_ref{type=WindowT}=Window, Options)
 when is_list(Options) ->
  ?CLASS(ThisT,wxSizer),
  IswxWindow = ?CLASS_T(WindowT,wxWindow),
  IswxSizer = ?CLASS_T(WindowT,wxSizer),
  WindowType = if
    IswxWindow ->   wxWindow;
    IswxSizer ->   wxSizer;
    true -> error({badarg, WindowT})
  end,
  MOpts = fun({recursive, _recursive} = Arg) -> Arg;
          (BadOpt) -> erlang:error({badoption, BadOpt}) end,
  Opts = lists:map(MOpts, Options),
  wxe_util:queue_cmd(This,wx:typeCast(Window, WindowType), Opts,?get_env(),?wxSizer_Hide_2),
  wxe_util:rec(?wxSizer_Hide_2).

-doc "".
-spec insert(This, Index, Item) -> wxSizerItem:wxSizerItem() when
	This::wxSizer(), Index::integer(), Item::wxSizerItem:wxSizerItem().
insert(#wx_ref{type=ThisT}=This,Index,#wx_ref{type=ItemT}=Item)
 when is_integer(Index) ->
  ?CLASS(ThisT,wxSizer),
  ?CLASS(ItemT,wxSizerItem),
  wxe_util:queue_cmd(This,Index,Item,?get_env(),?wxSizer_Insert_2),
  wxe_util:rec(?wxSizer_Insert_2).

-doc """
Insert a child into the sizer before any existing item at `index`.

See `add/4` for the meaning of the other parameters.
""".
-spec insert(This, Index, Width, Height) -> wxSizerItem:wxSizerItem() when
	This::wxSizer(), Index::integer(), Width::integer(), Height::integer();
      (This, Index, Window, Flags) -> wxSizerItem:wxSizerItem() when
	This::wxSizer(), Index::integer(), Window::wxWindow:wxWindow() | wxSizer:wxSizer(), Flags::wxSizerFlags:wxSizerFlags();
      (This, Index, Window, [Option]) -> wxSizerItem:wxSizerItem() when
	This::wxSizer(), Index::integer(), Window::wxWindow:wxWindow() | wxSizer:wxSizer(),
	Option :: {'proportion', integer()}
		 | {'flag', integer()}
		 | {'border', integer()}
		 | {'userData', wx:wx_object()}.

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}=This,Index,#wx_ref{type=WindowT}=Window,#wx_ref{type=FlagsT}=Flags)
 when is_integer(Index) ->
  ?CLASS(ThisT,wxSizer),
  IswxWindow = ?CLASS_T(WindowT,wxWindow),
  IswxSizer = ?CLASS_T(WindowT,wxSizer),
  WindowType = if
    IswxWindow ->   ?CLASS(FlagsT,wxSizerFlags),   wxWindow;
    IswxSizer ->   ?CLASS(FlagsT,wxSizerFlags),   wxSizer;
    true -> error({badarg, WindowT})
  end,
  ?CLASS(FlagsT,wxSizerFlags),
  wxe_util:queue_cmd(This,Index,wx:typeCast(Window, WindowType),Flags,?get_env(),?wxSizer_Insert_3_0),
  wxe_util:rec(?wxSizer_Insert_3_0);
insert(#wx_ref{type=ThisT}=This,Index,#wx_ref{type=WindowT}=Window, Options)
 when is_integer(Index),is_list(Options) ->
  ?CLASS(ThisT,wxSizer),
  IswxWindow = ?CLASS_T(WindowT,wxWindow),
  IswxSizer = ?CLASS_T(WindowT,wxSizer),
  WindowType = if
    IswxWindow ->   wxWindow;
    IswxSizer ->   wxSizer;
    true -> error({badarg, WindowT})
  end,
  MOpts = fun({proportion, _proportion} = Arg) -> Arg;
          ({flag, _flag} = Arg) -> Arg;
          ({border, _border} = Arg) -> Arg;
          ({userData, #wx_ref{type=UserDataT}} = Arg) ->   ?CLASS(UserDataT,wx),Arg;
          (BadOpt) -> erlang:error({badoption, BadOpt}) end,
  Opts = lists:map(MOpts, Options),
  wxe_util:queue_cmd(This,Index,wx:typeCast(Window, WindowType), Opts,?get_env(),?wxSizer_Insert_3_1),
  wxe_util:rec(?wxSizer_Insert_3_1).

-doc """
Insert a child into the sizer before any existing item at `index`.

See `add/4` for the meaning of the other parameters.
""".
-spec insert(This, Index, Width, Height, [Option]) -> wxSizerItem:wxSizerItem() when
	This::wxSizer(), Index::integer(), Width::integer(), Height::integer(),
	Option :: {'proportion', integer()}
		 | {'flag', integer()}
		 | {'border', integer()}
		 | {'userData', wx:wx_object()};
      (This, Index, Width, Height, Flags) -> wxSizerItem:wxSizerItem() when
	This::wxSizer(), Index::integer(), Width::integer(), Height::integer(), Flags::wxSizerFlags:wxSizerFlags().
insert(#wx_ref{type=ThisT}=This,Index,Width,Height, Options)
 when is_integer(Index),is_integer(Width),is_integer(Height),is_list(Options) ->
  ?CLASS(ThisT,wxSizer),
  MOpts = fun({proportion, _proportion} = Arg) -> Arg;
          ({flag, _flag} = Arg) -> Arg;
          ({border, _border} = Arg) -> Arg;
          ({userData, #wx_ref{type=UserDataT}} = Arg) ->   ?CLASS(UserDataT,wx),Arg;
          (BadOpt) -> erlang:error({badoption, BadOpt}) end,
  Opts = lists:map(MOpts, Options),
  wxe_util:queue_cmd(This,Index,Width,Height, Opts,?get_env(),?wxSizer_Insert_4_0),
  wxe_util:rec(?wxSizer_Insert_4_0);
insert(#wx_ref{type=ThisT}=This,Index,Width,Height,#wx_ref{type=FlagsT}=Flags)
 when is_integer(Index),is_integer(Width),is_integer(Height) ->
  ?CLASS(ThisT,wxSizer),
  ?CLASS(FlagsT,wxSizerFlags),
  wxe_util:queue_cmd(This,Index,Width,Height,Flags,?get_env(),?wxSizer_Insert_4_1),
  wxe_util:rec(?wxSizer_Insert_4_1).

-doc """
Inserts non-stretchable space to the sizer.

More readable way of calling wxSizer::Insert(index, size, size).
""".
-spec insertSpacer(This, Index, Size) -> wxSizerItem:wxSizerItem() when
	This::wxSizer(), Index::integer(), Size::integer().
insertSpacer(#wx_ref{type=ThisT}=This,Index,Size)
 when is_integer(Index),is_integer(Size) ->
  ?CLASS(ThisT,wxSizer),
  wxe_util:queue_cmd(This,Index,Size,?get_env(),?wxSizer_InsertSpacer),
  wxe_util:rec(?wxSizer_InsertSpacer).

-doc(#{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, []).

-doc """
Inserts stretchable space to the sizer.

More readable way of calling wxSizer::Insert(0, 0, prop).
""".
-spec insertStretchSpacer(This, Index, [Option]) -> wxSizerItem:wxSizerItem() when
	This::wxSizer(), Index::integer(),
	Option :: {'prop', integer()}.
insertStretchSpacer(#wx_ref{type=ThisT}=This,Index, Options)
 when is_integer(Index),is_list(Options) ->
  ?CLASS(ThisT,wxSizer),
  MOpts = fun({prop, _prop} = Arg) -> Arg;
          (BadOpt) -> erlang:error({badoption, BadOpt}) end,
  Opts = lists:map(MOpts, Options),
  wxe_util:queue_cmd(This,Index, Opts,?get_env(),?wxSizer_InsertStretchSpacer),
  wxe_util:rec(?wxSizer_InsertStretchSpacer).

-doc """
Returns true if the item at `index` is shown.

See:
* `hide/3`

* `show/3`

* `wxSizerItem:isShown/1`
""".
-spec isShown(This, Window) -> boolean() when
	This::wxSizer(), Window::wxWindow:wxWindow() | wxSizer:wxSizer();
      (This, Index) -> boolean() when
	This::wxSizer(), Index::integer().
isShown(#wx_ref{type=ThisT}=This,#wx_ref{type=WindowT}=Window) ->
  ?CLASS(ThisT,wxSizer),
  IswxWindow = ?CLASS_T(WindowT,wxWindow),
  IswxSizer = ?CLASS_T(WindowT,wxSizer),
  WindowType = if
    IswxWindow ->   wxWindow;
    IswxSizer ->   wxSizer;
    true -> error({badarg, WindowT})
  end,
  wxe_util:queue_cmd(This,wx:typeCast(Window, WindowType),?get_env(),?wxSizer_IsShown_1_0),
  wxe_util:rec(?wxSizer_IsShown_1_0);
isShown(#wx_ref{type=ThisT}=This,Index)
 when is_integer(Index) ->
  ?CLASS(ThisT,wxSizer),
  wxe_util:queue_cmd(This,Index,?get_env(),?wxSizer_IsShown_1_1),
  wxe_util:rec(?wxSizer_IsShown_1_1).

-doc "Equivalent to: `layout/1`".
-spec recalcSizes(This) -> 'ok' when
	This::wxSizer().

recalcSizes(This)
 when is_record(This, wx_ref) ->
  layout(This).

-doc """
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.
""".
-spec layout(This) -> 'ok' when
	This::wxSizer().
layout(#wx_ref{type=ThisT}=This) ->
  ?CLASS(ThisT,wxSizer),
  wxe_util:queue_cmd(This,?get_env(),?wxSizer_Layout).

-doc "".
-spec prepend(This, Item) -> wxSizerItem:wxSizerItem() when
	This::wxSizer(), Item::wxSizerItem:wxSizerItem().
prepend(#wx_ref{type=ThisT}=This,#wx_ref{type=ItemT}=Item) ->
  ?CLASS(ThisT,wxSizer),
  ?CLASS(ItemT,wxSizerItem),
  wxe_util:queue_cmd(This,Item,?get_env(),?wxSizer_Prepend_1),
  wxe_util:rec(?wxSizer_Prepend_1).

-doc """
Same as `add/4`, but prepends the items to the beginning of the list of items (windows,
subsizers or spaces) owned by this sizer.
""".
-spec prepend(This, Width, Height) -> wxSizerItem:wxSizerItem() when
	This::wxSizer(), Width::integer(), Height::integer();
      (This, Window, Flags) -> wxSizerItem:wxSizerItem() when
	This::wxSizer(), Window::wxWindow:wxWindow() | wxSizer:wxSizer(), Flags::wxSizerFlags:wxSizerFlags();
      (This, Window, [Option]) -> wxSizerItem:wxSizerItem() when
	This::wxSizer(), Window::wxWindow:wxWindow() | wxSizer:wxSizer(),
	Option :: {'proportion', integer()}
		 | {'flag', integer()}
		 | {'border', integer()}
		 | {'userData', wx:wx_object()}.

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}=This,#wx_ref{type=WindowT}=Window,#wx_ref{type=FlagsT}=Flags) ->
  ?CLASS(ThisT,wxSizer),
  IswxWindow = ?CLASS_T(WindowT,wxWindow),
  IswxSizer = ?CLASS_T(WindowT,wxSizer),
  WindowType = if
    IswxWindow ->   ?CLASS(FlagsT,wxSizerFlags),   wxWindow;
    IswxSizer ->   ?CLASS(FlagsT,wxSizerFlags),   wxSizer;
    true -> error({badarg, WindowT})
  end,
  ?CLASS(FlagsT,wxSizerFlags),
  wxe_util:queue_cmd(This,wx:typeCast(Window, WindowType),Flags,?get_env(),?wxSizer_Prepend_2_0),
  wxe_util:rec(?wxSizer_Prepend_2_0);
prepend(#wx_ref{type=ThisT}=This,#wx_ref{type=WindowT}=Window, Options)
 when is_list(Options) ->
  ?CLASS(ThisT,wxSizer),
  IswxWindow = ?CLASS_T(WindowT,wxWindow),
  IswxSizer = ?CLASS_T(WindowT,wxSizer),
  WindowType = if
    IswxWindow ->   wxWindow;
    IswxSizer ->   wxSizer;
    true -> error({badarg, WindowT})
  end,
  MOpts = fun({proportion, _proportion} = Arg) -> Arg;
          ({flag, _flag} = Arg) -> Arg;
          ({border, _border} = Arg) -> Arg;
          ({userData, #wx_ref{type=UserDataT}} = Arg) ->   ?CLASS(UserDataT,wx),Arg;
          (BadOpt) -> erlang:error({badoption, BadOpt}) end,
  Opts = lists:map(MOpts, Options),
  wxe_util:queue_cmd(This,wx:typeCast(Window, WindowType), Opts,?get_env(),?wxSizer_Prepend_2_1),
  wxe_util:rec(?wxSizer_Prepend_2_1).

-doc """
Same as `add/4`, but prepends the items to the beginning of the list of items (windows,
subsizers or spaces) owned by this sizer.
""".
-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()};
      (This, Width, Height, Flags) -> wxSizerItem:wxSizerItem() when
	This::wxSizer(), Width::integer(), Height::integer(), Flags::wxSizerFlags:wxSizerFlags().
prepend(#wx_ref{type=ThisT}=This,Width,Height, Options)
 when is_integer(Width),is_integer(Height),is_list(Options) ->
  ?CLASS(ThisT,wxSizer),
  MOpts = fun({proportion, _proportion} = Arg) -> Arg;
          ({flag, _flag} = Arg) -> Arg;
          ({border, _border} = Arg) -> Arg;
          ({userData, #wx_ref{type=UserDataT}} = Arg) ->   ?CLASS(UserDataT,wx),Arg;
          (BadOpt) -> erlang:error({badoption, BadOpt}) end,
  Opts = lists:map(MOpts, Options),
  wxe_util:queue_cmd(This,Width,Height, Opts,?get_env(),?wxSizer_Prepend_3_0),
  wxe_util:rec(?wxSizer_Prepend_3_0);
prepend(#wx_ref{type=ThisT}=This,Width,Height,#wx_ref{type=FlagsT}=Flags)
 when is_integer(Width),is_integer(Height) ->
  ?CLASS(ThisT,wxSizer),
  ?CLASS(FlagsT,wxSizerFlags),
  wxe_util:queue_cmd(This,Width,Height,Flags,?get_env(),?wxSizer_Prepend_3_1),
  wxe_util:rec(?wxSizer_Prepend_3_1).

-doc """
Prepends non-stretchable space to the sizer.

More readable way of calling wxSizer::Prepend(size, size, 0).
""".
-spec prependSpacer(This, Size) -> wxSizerItem:wxSizerItem() when
	This::wxSizer(), Size::integer().
prependSpacer(#wx_ref{type=ThisT}=This,Size)
 when is_integer(Size) ->
  ?CLASS(ThisT,wxSizer),
  wxe_util:queue_cmd(This,Size,?get_env(),?wxSizer_PrependSpacer),
  wxe_util:rec(?wxSizer_PrependSpacer).

-doc(#{equiv => prependStretchSpacer(This, [])}).
-spec prependStretchSpacer(This) -> wxSizerItem:wxSizerItem() when
	This::wxSizer().

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

-doc """
Prepends stretchable space to the sizer.

More readable way of calling wxSizer::Prepend(0, 0, prop).
""".
-spec prependStretchSpacer(This, [Option]) -> wxSizerItem:wxSizerItem() when
	This::wxSizer(),
	Option :: {'prop', integer()}.
prependStretchSpacer(#wx_ref{type=ThisT}=This, Options)
 when is_list(Options) ->
  ?CLASS(ThisT,wxSizer),
  MOpts = fun({prop, _prop} = Arg) -> Arg;
          (BadOpt) -> erlang:error({badoption, BadOpt}) end,
  Opts = lists:map(MOpts, Options),
  wxe_util:queue_cmd(This, Opts,?get_env(),?wxSizer_PrependStretchSpacer),
  wxe_util:rec(?wxSizer_PrependStretchSpacer).

-doc """
Removes a sizer child from the sizer and destroys it.

Note: This method does not cause any layout or resizing to take place, call `layout/1` to update
the layout "on screen" after removing a child from the sizer.

Return: true if the child item was found and removed, false otherwise.
""".
-spec remove(This, Index) -> boolean() when
	This::wxSizer(), Index::integer();
      (This, Sizer) -> boolean() when
	This::wxSizer(), Sizer::wxSizer().
remove(#wx_ref{type=ThisT}=This,Index)
 when is_integer(Index) ->
  ?CLASS(ThisT,wxSizer),
  wxe_util:queue_cmd(This,Index,?get_env(),?wxSizer_Remove_1_0),
  wxe_util:rec(?wxSizer_Remove_1_0);
remove(#wx_ref{type=ThisT}=This,#wx_ref{type=SizerT}=Sizer) ->
  ?CLASS(ThisT,wxSizer),
  ?CLASS(SizerT,wxSizer),
  wxe_util:queue_cmd(This,Sizer,?get_env(),?wxSizer_Remove_1_1),
  wxe_util:rec(?wxSizer_Remove_1_1).

-doc """
Detaches the given item at position `index` from the sizer and replaces it with the given `m:wxSizerItem`
`newitem`.

The detached child is deleted `only` if it is a sizer or a spacer (but not if it is a `m:wxWindow`
because windows are owned by their parent window, not the sizer).

This method does not cause any layout or resizing to take place, call `layout/1` 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.
""".
-spec replace(This, Oldwin, Newwin) -> boolean() when
	This::wxSizer(), Oldwin::wxWindow:wxWindow() | wxSizer:wxSizer(), Newwin::wxWindow:wxWindow() | wxSizer: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}=This,Index,#wx_ref{type=NewitemT}=Newitem)
 when is_integer(Index) ->
  ?CLASS(ThisT,wxSizer),
  ?CLASS(NewitemT,wxSizerItem),
  wxe_util:queue_cmd(This,Index,Newitem,?get_env(),?wxSizer_Replace_2),
  wxe_util:rec(?wxSizer_Replace_2).

-doc """
Detaches the given `oldwin` from the sizer and replaces it with the given `newwin`.

The detached child window is `not` deleted (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 `layout/1` 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.
""".
-spec replace(This, Oldwin, Newwin, [Option]) -> boolean() when
	This::wxSizer(), Oldwin::wxWindow:wxWindow() | wxSizer:wxSizer(), Newwin::wxWindow:wxWindow() | wxSizer:wxSizer(),
	Option :: {'recursive', boolean()}.
replace(#wx_ref{type=ThisT}=This,#wx_ref{type=OldwinT}=Oldwin,#wx_ref{type=NewwinT}=Newwin, Options)
 when is_list(Options) ->
  ?CLASS(ThisT,wxSizer),
  IswxWindow = ?CLASS_T(OldwinT,wxWindow),
  IswxSizer = ?CLASS_T(OldwinT,wxSizer),
  OldwinType = if
    IswxWindow ->   ?CLASS(NewwinT,wxWindow),   wxWindow;
    IswxSizer ->   ?CLASS(NewwinT,wxSizer),   wxSizer;
    true -> error({badarg, OldwinT})
  end,
  IswxWindow = ?CLASS_T(NewwinT,wxWindow),
  IswxSizer = ?CLASS_T(NewwinT,wxSizer),
  NewwinType = if
    IswxWindow ->   wxWindow;
    IswxSizer ->   wxSizer;
    true -> error({badarg, NewwinT})
  end,
  MOpts = fun({recursive, _recursive} = Arg) -> Arg;
          (BadOpt) -> erlang:error({badoption, BadOpt}) end,
  Opts = lists:map(MOpts, Options),
  wxe_util:queue_cmd(This,wx:typeCast(Oldwin, OldwinType),wx:typeCast(Newwin, NewwinType), Opts,?get_env(),?wxSizer_Replace_3),
  wxe_util:rec(?wxSizer_Replace_3).

-doc """
This is an overloaded member function, provided for convenience. It differs from the
above function only in what argument(s) it accepts.
""".
-spec setDimension(This, Pos, Size) -> 'ok' when
	This::wxSizer(), Pos::{X::integer(), Y::integer()}, Size::{W::integer(), H::integer()}.
setDimension(#wx_ref{type=ThisT}=This,{PosX,PosY} = Pos,{SizeW,SizeH} = Size)
 when is_integer(PosX),is_integer(PosY),is_integer(SizeW),is_integer(SizeH) ->
  ?CLASS(ThisT,wxSizer),
  wxe_util:queue_cmd(This,Pos,Size,?get_env(),?wxSizer_SetDimension_2).

-doc """
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/4`
and `prepend/4` methods.
""".
-spec setDimension(This, X, Y, Width, Height) -> 'ok' when
	This::wxSizer(), X::integer(), Y::integer(), Width::integer(), Height::integer().
setDimension(#wx_ref{type=ThisT}=This,X,Y,Width,Height)
 when is_integer(X),is_integer(Y),is_integer(Width),is_integer(Height) ->
  ?CLASS(ThisT,wxSizer),
  wxe_util:queue_cmd(This,X,Y,Width,Height,?get_env(),?wxSizer_SetDimension_4).

-doc """
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/1` will return either the minimal size as requested
by its children or the minimal size set here, depending on which is bigger.
""".
-spec setMinSize(This, Size) -> 'ok' when
	This::wxSizer(), Size::{W::integer(), H::integer()}.
setMinSize(#wx_ref{type=ThisT}=This,{SizeW,SizeH} = Size)
 when is_integer(SizeW),is_integer(SizeH) ->
  ?CLASS(ThisT,wxSizer),
  wxe_util:queue_cmd(This,Size,?get_env(),?wxSizer_SetMinSize_1).

-doc """
This is an overloaded member function, provided for convenience. It differs from the
above function only in what argument(s) it accepts.
""".
-spec setMinSize(This, Width, Height) -> 'ok' when
	This::wxSizer(), Width::integer(), Height::integer().
setMinSize(#wx_ref{type=ThisT}=This,Width,Height)
 when is_integer(Width),is_integer(Height) ->
  ?CLASS(ThisT,wxSizer),
  wxe_util:queue_cmd(This,Width,Height,?get_env(),?wxSizer_SetMinSize_2).

-doc "".
-spec setItemMinSize(This, Window, Size) -> boolean() when
	This::wxSizer(), Window::wxWindow:wxWindow() | wxSizer:wxSizer(), Size::{W::integer(), H::integer()};
      (This, Index, Size) -> boolean() when
	This::wxSizer(), Index::integer(), Size::{W::integer(), H::integer()}.
setItemMinSize(#wx_ref{type=ThisT}=This,#wx_ref{type=WindowT}=Window,{SizeW,SizeH} = Size)
 when is_integer(SizeW),is_integer(SizeH) ->
  ?CLASS(ThisT,wxSizer),
  IswxWindow = ?CLASS_T(WindowT,wxWindow),
  IswxSizer = ?CLASS_T(WindowT,wxSizer),
  WindowType = if
    IswxWindow ->   wxWindow;
    IswxSizer ->   wxSizer;
    true -> error({badarg, WindowT})
  end,
  wxe_util:queue_cmd(This,wx:typeCast(Window, WindowType),Size,?get_env(),?wxSizer_SetItemMinSize_2_0),
  wxe_util:rec(?wxSizer_SetItemMinSize_2_0);
setItemMinSize(#wx_ref{type=ThisT}=This,Index,{SizeW,SizeH} = Size)
 when is_integer(Index),is_integer(SizeW),is_integer(SizeH) ->
  ?CLASS(ThisT,wxSizer),
  wxe_util:queue_cmd(This,Index,Size,?get_env(),?wxSizer_SetItemMinSize_2_1),
  wxe_util:rec(?wxSizer_SetItemMinSize_2_1).

-doc "".
-spec setItemMinSize(This, Window, Width, Height) -> boolean() when
	This::wxSizer(), Window::wxWindow:wxWindow() | wxSizer:wxSizer(), Width::integer(), Height::integer();
      (This, Index, Width, Height) -> boolean() when
	This::wxSizer(), Index::integer(), Width::integer(), Height::integer().
setItemMinSize(#wx_ref{type=ThisT}=This,#wx_ref{type=WindowT}=Window,Width,Height)
 when is_integer(Width),is_integer(Height) ->
  ?CLASS(ThisT,wxSizer),
  IswxWindow = ?CLASS_T(WindowT,wxWindow),
  IswxSizer = ?CLASS_T(WindowT,wxSizer),
  WindowType = if
    IswxWindow ->   wxWindow;
    IswxSizer ->   wxSizer;
    true -> error({badarg, WindowT})
  end,
  wxe_util:queue_cmd(This,wx:typeCast(Window, WindowType),Width,Height,?get_env(),?wxSizer_SetItemMinSize_3_0),
  wxe_util:rec(?wxSizer_SetItemMinSize_3_0);
setItemMinSize(#wx_ref{type=ThisT}=This,Index,Width,Height)
 when is_integer(Index),is_integer(Width),is_integer(Height) ->
  ?CLASS(ThisT,wxSizer),
  wxe_util:queue_cmd(This,Index,Width,Height,?get_env(),?wxSizer_SetItemMinSize_3_1),
  wxe_util:rec(?wxSizer_SetItemMinSize_3_1).

-doc """
This method first calls `fit/2` and then `setSizeHints/2` on the `window` passed to it.

This only makes sense when `window` is actually a `m:wxTopLevelWindow` such as a `m:wxFrame`
or a `m:wxDialog`, since SetSizeHints only has any effect in these classes. It does
nothing in normal windows or controls.

This method is implicitly used by `wxWindow:setSizerAndFit/3` which is commonly invoked in the constructor of a
toplevel window itself (see the sample in the description of `m:wxBoxSizer`) if the
toplevel window is resizable.
""".
-spec setSizeHints(This, Window) -> 'ok' when
	This::wxSizer(), Window::wxWindow:wxWindow().
setSizeHints(#wx_ref{type=ThisT}=This,#wx_ref{type=WindowT}=Window) ->
  ?CLASS(ThisT,wxSizer),
  ?CLASS(WindowT,wxWindow),
  wxe_util:queue_cmd(This,Window,?get_env(),?wxSizer_SetSizeHints).

-doc "".
-spec show(This, Window) -> boolean() when
	This::wxSizer(), Window::wxWindow:wxWindow() | wxSizer:wxSizer();
      (This, Index) -> boolean() when
	This::wxSizer(), Index::integer();
      (This, Show) -> 'ok' when
	This::wxSizer(), Show::boolean().

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

show(This,Index)
 when is_record(This, wx_ref),is_integer(Index) ->
  show(This,Index, []);
show(#wx_ref{type=ThisT}=This,Show)
 when is_boolean(Show) ->
  ?CLASS(ThisT,wxSizer),
  wxe_util:queue_cmd(This,Show,?get_env(),?wxSizer_Show_1).

-doc """
Shows the item at `index`.

To make a sizer item disappear or reappear, use `show/3` followed by `layout/1`.

Returns true if the child item was found, false otherwise.

See:
* `hide/3`

* `isShown/2`
""".
-spec show(This, Window, [Option]) -> boolean() when
	This::wxSizer(), Window::wxWindow:wxWindow() | wxSizer:wxSizer(),
	Option :: {'show', boolean()}
		 | {'recursive', boolean()};
      (This, Index, [Option]) -> boolean() when
	This::wxSizer(), Index::integer(),
	Option :: {'show', boolean()}.
show(#wx_ref{type=ThisT}=This,#wx_ref{type=WindowT}=Window, Options)
 when is_list(Options) ->
  ?CLASS(ThisT,wxSizer),
  IswxWindow = ?CLASS_T(WindowT,wxWindow),
  IswxSizer = ?CLASS_T(WindowT,wxSizer),
  WindowType = if
    IswxWindow ->   wxWindow;
    IswxSizer ->   wxSizer;
    true -> error({badarg, WindowT})
  end,
  MOpts = fun({show, _show} = Arg) -> Arg;
          ({recursive, _recursive} = Arg) -> Arg;
          (BadOpt) -> erlang:error({badoption, BadOpt}) end,
  Opts = lists:map(MOpts, Options),
  wxe_util:queue_cmd(This,wx:typeCast(Window, WindowType), Opts,?get_env(),?wxSizer_Show_2_0),
  wxe_util:rec(?wxSizer_Show_2_0);
show(#wx_ref{type=ThisT}=This,Index, Options)
 when is_integer(Index),is_list(Options) ->
  ?CLASS(ThisT,wxSizer),
  MOpts = fun({show, _show} = Arg) -> Arg;
          (BadOpt) -> erlang:error({badoption, BadOpt}) end,
  Opts = lists:map(MOpts, Options),
  wxe_util:queue_cmd(This,Index, Opts,?get_env(),?wxSizer_Show_2_1),
  wxe_util:rec(?wxSizer_Show_2_1).

-doc "Show or hide all items managed by the sizer.".
-spec showItems(This, Show) -> 'ok' when
	This::wxSizer(), Show::boolean().
showItems(#wx_ref{type=ThisT}=This,Show)
 when is_boolean(Show) ->
  ?CLASS(ThisT,wxSizer),
  wxe_util:queue_cmd(This,Show,?get_env(),?wxSizer_ShowItems).

