Tk_CreateWindow,  Tk_CreateWindowFromPath,  Tk_DestroyWin­
       dow, Tk_MakeWindowExist - create or delete window


       #include <tk.h>

       Tk_CreateWindow(interp, parent, name, topLevScreen)

       Tk_CreateWindowFromPath(interp, tkwin, pathName, topLevScreen)




       Tcl_Interp   *interp         (out)     Tcl interpreter  to
                                              use    for    error
                                              reporting.   If  no
                                              error  occurs, then
                                              *interp isn't modi­

       Tk_Window    parent          (in)      Token  for the win­
                                              dow  that   is   to
                                              serve  as the logi­
                                              cal parent  of  the
                                              new window.

       char         *name           (in)      Name   to  use  for
                                              this window.   Must
                                              be unique among all
                                              children   of   the
                                              same parent.

       char         *topLevScreen   (in)      Has  same format as
                                              screenName.      If
                                              NULL, then new win­
                                              dow is  created  as
                                              an internal window.
                                              If  non-NULL,   new
                                              window  is  created
                                              as a top-level win­
                                              dow    on    screen
                                              topLevScreen.    If
                                              topLevScreen  is an
                                              empty string (``'')
                                              then  new window is
                                              created   as   top-

       Tk_Window    tkwin           (in)      Token for window.

       char         *pathName       (in)      Name of new window,
                                              specified  as  path
                                              name within  appli­
                                              cation        (e.g.


       The procedures Tk_CreateWindow and Tk_CreateWindowFromPath |
       are  used to create new windows for use in Tk-based appli­ |
       cations.  Each of the procedures returns a token that  can |
       be  used to manipulate the window in other calls to the Tk |
       library.  If the window couldn't be created  successfully, |
       then  NULL  is  returned and interp->result is modified to |
       hold an error message.                                     |

       Tk supports two different kinds of windows:  internal win­ |
       dows  and  top-level  windows.   An  internal window is an
       interior window of a Tk application, such as  a  scrollbar
       or  menu bar or button.  A top-level window is one that is
       created as a child of a screen's root window, rather  than
       as an interior window, but which is logically part of some
       existing main window.  Examples of top-level  windows  are
       pop-up menus and dialog boxes.

       New windows may be created by calling Tk_CreateWindow.  If
       the topLevScreen argument is NULL,  then  the  new  window
       will  be an internal window.  If topLevScreen is non-NULL,
       then  the  new  window  will  be   a   top-level   window:
       topLevScreen  indicates  the  name of a screen and the new
       window will be created as a child of the  root  window  of
       topLevScreen.   In  either  case  Tk will consider the new
       window to be the logical child of parent: the new window's
       path name will reflect this fact, options may be specified
       for the new window under this assumption, and so on.   The
       only  difference is that new X window for a top-level win­
       dow will not be a child of parent's X window.   For  exam­
       ple,  a  pull-down  menu's parent would be the button-like
       window used to invoke it, which would in turn be  a  child
       of  the  menu  bar  window.   A  dialog box might have the
       application's main window as its parent.

       Tk_CreateWindowFromPath offers an alternate way of  speci­
       fying  new  windows.   In  Tk_CreateWindowFromPath the new
       window is specified with a token for  any  window  in  the
       target  application  (tkwin), plus a path name for the new
       window.  It produces the same  effect  as  Tk_CreateWindow
       and  allows both top-level and internal windows to be cre­
       the parent of the new window must exist at the time of the
       call, but the new window must not already exist.

       The  window  creation  procedures don't actually issue the
       command to X to create a window.  Instead, they  create  a
       local  data structure associated with the window and defer
       the creation of the X window.  The window will actually be
       created  by the first call to Tk_MapWindow.  Deferred win­
       dow creation allows various aspects of the window (such as
       its size, background color, etc.) to be modified after its
       creation without incurring any overhead in the  X  server.
       When  the  window  is  finally  mapped  all  of the window
       attributes can be set while creating the window.

       The value returned by a window-creation procedure  is  not
       the  X  token  for the window (it can't be, since X hasn't
       been asked to create the window yet).  Instead,  it  is  a
       token  for Tk's local data structure for the window.  Most
       of the Tk library procedures take Tk_Window tokens, rather
       than X identifiers.  The actual X window identifier can be
       retrieved from the local data structure using the  Tk_Win­
       dowId  macro;   see  the  manual entry for Tk_WindowId for

       Tk_DestroyWindow deletes a window and all the data  struc­
       tures  associated  with  it,  including any event handlers
       created   with   Tk_CreateEventHandler.    In    addition,
       Tk_DestroyWindow  will delete any children of tkwin recur­
       sively (where children are defined in the Tk  sense,  con­
       sisting  of  all  windows that were created with the given
       window as parent).  If tkwin is an internal  window,  then
       event  handlers  interested  in destroy events are invoked
       immediately.  If tkwin is a top-level or main window, then
       the event handlers will be invoked later, after X has seen
       the request and returned an event for it.

       If a window has been created but hasn't been mapped, so no
       X  window  exists, it is possible to force the creation of
       the X window by calling Tk_MakeWindowExist.   This  proce­
       dure issues the X commands to instantiate the window given
       by tkwin.


       create, deferred creation, destroy, display, internal win­
       dow, screen, top-level window, window