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NAME

       wxSizer - Functions for wxSizer class

DESCRIPTION

       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,
       wxWrapSizer (not implemented in wx) 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/4,  insert/5, and prepend/4 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/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 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

       wxWidgets docs: wxSizer

DATA TYPES

       wxSizer() = wx:wx_object()

EXPORTS

       add(This, Window) -> wxSizerItem:wxSizerItem()

              Types:

                 This = wxSizer()
                 Window = wxWindow:wxWindow() | wxSizer:wxSizer()

       add(This, Width, Height) -> wxSizerItem:wxSizerItem()

       add(This, Window, Flags) -> wxSizerItem:wxSizerItem()

       add(This, Window, Height :: [Option]) -> wxSizerItem:wxSizerItem()

              Types:

                 This = wxSizer()
                 Window = wxWindow:wxWindow() | wxSizer:wxSizer()
                 Option =
                     {proportion, integer()} |
                     {flag, integer()} |
                     {border, integer()} |
                     {userData, wx:wx_object()}

              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:

       add(This, Width, Height, Options :: [Option]) ->
              wxSizerItem:wxSizerItem()

       add(This, Width, Height, Flags) -> wxSizerItem:wxSizerItem()

              Types:

                 This = wxSizer()
                 Width = Height = integer()
                 Flags = wxSizerFlags:wxSizerFlags()

              Appends a spacer child to the sizer.

       addSpacer(This, Size) -> wxSizerItem:wxSizerItem()

              Types:

                 This = wxSizer()
                 Size = integer()

              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

       addStretchSpacer(This) -> wxSizerItem:wxSizerItem()

              Types:

                 This = wxSizer()

       addStretchSpacer(This, Options :: [Option]) ->
                           wxSizerItem:wxSizerItem()

              Types:

                 This = wxSizer()
                 Option = {prop, integer()}

              Adds stretchable space to the sizer.

              More readable way of calling:

       calcMin(This) -> {W :: integer(), H :: integer()}

              Types:

                 This = wxSizer()

              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.

       clear(This) -> ok

              Types:

                 This = wxSizer()

       clear(This, Options :: [Option]) -> ok

              Types:

                 This = wxSizer()
                 Option = {delete_windows, boolean()}

              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).

       detach(This, Window) -> boolean()

       detach(This, Index) -> boolean()

              Types:

                 This = wxSizer()
                 Index = integer()

              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

       fit(This, Window) -> {W :: integer(), H :: integer()}

              Types:

                 This = wxSizer()
                 Window = wxWindow:wxWindow()

              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 wxBoxSizer.

              Return: The new window size.

              See: ComputeFittingClientSize() (not implemented in wx), ComputeFittingWindowSize()
              (not implemented in wx)

       setVirtualSizeHints(This, Window) -> ok

              Types:

                 This = wxSizer()
                 Window = wxWindow:wxWindow()

              See: fitInside/2.

       fitInside(This, Window) -> ok

              Types:

                 This = wxSizer()
                 Window = wxWindow:wxWindow()

              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

       getChildren(This) -> [wxSizerItem:wxSizerItem()]

              Types:

                 This = wxSizer()

       getItem(This, Window) -> wxSizerItem:wxSizerItem()

       getItem(This, Index) -> wxSizerItem:wxSizerItem()

              Types:

                 This = wxSizer()
                 Index = integer()

              Finds wxSizerItem which is located in the sizer at position index.

              Use  parameter  recursive  to  search  in subsizers too. Returns pointer to item or
              NULL.

       getItem(This, Window, Options :: [Option]) ->
                  wxSizerItem:wxSizerItem()

              Types:

                 This = wxSizer()
                 Window = wxWindow:wxWindow() | wxSizer:wxSizer()
                 Option = {recursive, boolean()}

              Finds wxSizerItem which holds the given window.

              Use parameter recursive to search in subsizers too.  Returns  pointer  to  item  or
              NULL.

       getSize(This) -> {W :: integer(), H :: integer()}

              Types:

                 This = wxSizer()

              Returns the current size of the sizer.

       getPosition(This) -> {X :: integer(), Y :: integer()}

              Types:

                 This = wxSizer()

              Returns the current position of the sizer.

       getMinSize(This) -> {W :: integer(), H :: integer()}

              Types:

                 This = wxSizer()

              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.

       hide(This, Window) -> boolean()

       hide(This, Index) -> boolean()

              Types:

                 This = wxSizer()
                 Index = integer()

              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

       hide(This, Window, Options :: [Option]) -> boolean()

              Types:

                 This = wxSizer()
                 Window = wxWindow:wxWindow() | wxSizer:wxSizer()
                 Option = {recursive, boolean()}

              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

       insert(This, Index, Item) -> wxSizerItem:wxSizerItem()

              Types:

                 This = wxSizer()
                 Index = integer()
                 Item = wxSizerItem:wxSizerItem()

       insert(This, Index, Width, Height) -> wxSizerItem:wxSizerItem()

       insert(This, Index, Window, Flags) -> wxSizerItem:wxSizerItem()

       insert(This, Index, Window, Height :: [Option]) ->
                 wxSizerItem:wxSizerItem()

              Types:

                 This = wxSizer()
                 Index = integer()
                 Window = wxWindow:wxWindow() | wxSizer:wxSizer()
                 Option =
                     {proportion, integer()} |
                     {flag, integer()} |
                     {border, integer()} |
                     {userData, wx:wx_object()}

              Insert a child into the sizer before any existing item at index.

              See add/4 for the meaning of the other parameters.

       insert(This, Index, Width, Height, Options :: [Option]) ->
                 wxSizerItem:wxSizerItem()

       insert(This, Index, Width, Height, Flags) ->
                 wxSizerItem:wxSizerItem()

              Types:

                 This = wxSizer()
                 Index = Width = Height = integer()
                 Flags = wxSizerFlags:wxSizerFlags()

              Insert a child into the sizer before any existing item at index.

              See add/4 for the meaning of the other parameters.

       insertSpacer(This, Index, Size) -> wxSizerItem:wxSizerItem()

              Types:

                 This = wxSizer()
                 Index = Size = integer()

              Inserts non-stretchable space to the sizer.

              More readable way of calling wxSizer::Insert(index, size, size).

       insertStretchSpacer(This, Index) -> wxSizerItem:wxSizerItem()

              Types:

                 This = wxSizer()
                 Index = integer()

       insertStretchSpacer(This, Index, Options :: [Option]) ->
                              wxSizerItem:wxSizerItem()

              Types:

                 This = wxSizer()
                 Index = integer()
                 Option = {prop, integer()}

              Inserts stretchable space to the sizer.

              More readable way of calling wxSizer::Insert(0, 0, prop).

       isShown(This, Window) -> boolean()

       isShown(This, Index) -> boolean()

              Types:

                 This = wxSizer()
                 Index = integer()

              Returns true if the item at index is shown.

              See: hide/3, show/3, wxSizerItem:isShown/1

       recalcSizes(This) -> ok

              Types:

                 This = wxSizer()

              See: layout/1.

       layout(This) -> ok

              Types:

                 This = wxSizer()

              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.

       prepend(This, Item) -> wxSizerItem:wxSizerItem()

              Types:

                 This = wxSizer()
                 Item = wxSizerItem:wxSizerItem()

       prepend(This, Width, Height) -> wxSizerItem:wxSizerItem()

       prepend(This, Window, Flags) -> wxSizerItem:wxSizerItem()

       prepend(This, Window, Height :: [Option]) ->
                  wxSizerItem:wxSizerItem()

              Types:

                 This = wxSizer()
                 Window = wxWindow:wxWindow() | wxSizer:wxSizer()
                 Option =
                     {proportion, integer()} |
                     {flag, integer()} |
                     {border, integer()} |
                     {userData, wx:wx_object()}

              Same as add/4, but prepends the items  to  the  beginning  of  the  list  of  items
              (windows, subsizers or spaces) owned by this sizer.

       prepend(This, Width, Height, Options :: [Option]) ->
                  wxSizerItem:wxSizerItem()

       prepend(This, Width, Height, Flags) -> wxSizerItem:wxSizerItem()

              Types:

                 This = wxSizer()
                 Width = Height = integer()
                 Flags = wxSizerFlags:wxSizerFlags()

              Same  as  add/4,  but  prepends  the  items  to  the beginning of the list of items
              (windows, subsizers or spaces) owned by this sizer.

       prependSpacer(This, Size) -> wxSizerItem:wxSizerItem()

              Types:

                 This = wxSizer()
                 Size = integer()

              Prepends non-stretchable space to the sizer.

              More readable way of calling wxSizer::Prepend(size, size, 0).

       prependStretchSpacer(This) -> wxSizerItem:wxSizerItem()

              Types:

                 This = wxSizer()

       prependStretchSpacer(This, Options :: [Option]) ->
                               wxSizerItem:wxSizerItem()

              Types:

                 This = wxSizer()
                 Option = {prop, integer()}

              Prepends stretchable space to the sizer.

              More readable way of calling wxSizer::Prepend(0, 0, prop).

       remove(This, Index) -> boolean()

       remove(This, Sizer) -> boolean()

              Types:

                 This = Sizer = wxSizer()

              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.

       replace(This, Oldwin, Newwin) -> boolean()

       replace(This, Index, Newitem) -> boolean()

              Types:

                 This = wxSizer()
                 Index = integer()
                 Newitem = wxSizerItem:wxSizerItem()

              Detaches  the  given item at position index from the sizer and replaces it with the
              given wxSizerItem newitem.

              The detached child is deleted only if it is a sizer or a spacer (but not if it is a
              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.

       replace(This, Oldwin, Newwin, Options :: [Option]) -> boolean()

              Types:

                 This = wxSizer()
                 Oldwin = Newwin = wxWindow:wxWindow() | wxSizer:wxSizer()
                 Option = {recursive, boolean()}

              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.

       setDimension(This, Pos, Size) -> ok

              Types:

                 This = wxSizer()
                 Pos = {X :: integer(), Y :: integer()}
                 Size = {W :: integer(), H :: integer()}

              This is an overloaded member function, provided for convenience.  It  differs  from
              the above function only in what argument(s) it accepts.

       setDimension(This, X, Y, Width, Height) -> ok

              Types:

                 This = wxSizer()
                 X = Y = Width = Height = integer()

              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.

       setMinSize(This, Size) -> ok

              Types:

                 This = wxSizer()
                 Size = {W :: integer(), H :: integer()}

              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.

       setMinSize(This, Width, Height) -> ok

              Types:

                 This = wxSizer()
                 Width = Height = integer()

              This is an overloaded member function, provided for convenience.  It  differs  from
              the above function only in what argument(s) it accepts.

       setItemMinSize(This, Window, Size) -> boolean()

       setItemMinSize(This, Index, Size) -> boolean()

              Types:

                 This = wxSizer()
                 Index = integer()
                 Size = {W :: integer(), H :: integer()}

       setItemMinSize(This, Window, Width, Height) -> boolean()

       setItemMinSize(This, Index, Width, Height) -> boolean()

              Types:

                 This = wxSizer()
                 Index = Width = Height = integer()

       setSizeHints(This, Window) -> ok

              Types:

                 This = wxSizer()
                 Window = wxWindow:wxWindow()

              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 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  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 wxBoxSizer) if the toplevel window is resizable.

       show(This, Window) -> boolean()

       show(This, Index) -> boolean()

       show(This, Show) -> ok

              Types:

                 This = wxSizer()
                 Show = boolean()

       show(This, Window, Options :: [Option]) -> boolean()

       show(This, Index, Options :: [Option]) -> boolean()

              Types:

                 This = wxSizer()
                 Index = integer()
                 Option = {show, boolean()}

              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

       showItems(This, Show) -> ok

              Types:

                 This = wxSizer()
                 Show = boolean()

              Show or hide all items managed by the sizer.