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Tk_CreateWindow(3)	     Tk Library Procedures	    Tk_CreateWindow(3)

______________________________________________________________________________

NAME
       Tk_CreateWindow, Tk_CreateWindowFromPath, Tk_DestroyWindow, Tk_MakeWin-
       dowExist - create or delete window

SYNOPSIS
       #include <tk.h>

       Tk_Window
       Tk_CreateWindow(interp, parent, name, topLevScreen)

       Tk_Window
       Tk_CreateAnonymousWindow(interp, parent, topLevScreen)

       Tk_Window
       Tk_CreateWindowFromPath(interp, tkwin, pathName, topLevScreen)

       Tk_DestroyWindow(tkwin)

       Tk_MakeWindowExist(tkwin)

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

       Tk_Window    parent	    (in)      Token for the window that is  to
					      serve  as	 the logical parent of
					      the new window.

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

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

       Tk_Window    tkwin	    (in)      Token for window.

       CONST char   *pathName	    (in)      Name of new window, specified as
					      path  name  within   application
					      (e.g. .a.b.c).
_________________________________________________________________

DESCRIPTION
       The  procedures	Tk_CreateWindow, Tk_CreateAnonymousWindow, and Tk_Cre- |
       ateWindowFromPath are used to create new windows for  use  in  Tk-based |
       applications.   Each of the procedures returns a token that can be used |
       to manipulate the window in other calls to the Tk library.  If the win- |
       dow  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 windows and  top- |
       level windows.  An internal window is an interior window of a Tk appli-
       cation, 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	exist-
       ing  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 assump-
       tion, and so on.	 The only difference is that new X window for  a  top-
       level  window will not be a child of parent's X window.	For example, 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_CreateAnonymousWindow differs from Tk_CreateWindow in that  it  cre-
       ates  an	 unnamed window.  This window will be manipulable only using C
       interfaces, and will not be visible to Tcl scripts.  Both interior win-
       dows  and  top-level windows may be created with Tk_CreateAnonymousWin-
       dow.

       Tk_CreateWindowFromPath offers an alternate way of specifying new  win-
       dows.   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_CreateWin-
       dow and allows both top-level  and  internal  windows  to  be  created,
       depending  on  the  value  of  topLevScreen.  In calls to Tk_CreateWin-
       dowFromPath, as in calls to Tk_CreateWindow, the parent of the new win-
       dow  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 associ-
       ated with the window and defer the creation of the X window.  The  win-
       dow  will  actually  be	created	 by  the  first	 call to Tk_MapWindow.
       Deferred window 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_WindowId macro;
       see the manual entry for Tk_WindowId for details.

       Tk_DestroyWindow deletes a window and all the data  structures  associ-
       ated  with it, including any event handlers created with Tk_CreateEven-
       tHandler.  In addition, Tk_DestroyWindow will delete  any  children  of
       tkwin recursively (where children are defined in the Tk sense, consist-
       ing 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 procedure issues the X commands to  instanti-
       ate the window given by tkwin.

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

Tk				      4.2		    Tk_CreateWindow(3)
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