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Tk_MaintainGeometry(3)       Tk Library Procedures      Tk_MaintainGeometry(3)



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NAME

       Tk_MaintainGeometry,  Tk_UnmaintainGeometry  - maintain geometry of one
       window relative to another


SYNOPSIS

       #include <tk.h>

       Tk_MaintainGeometry(window, container, x, y, width, height)

       Tk_UnmaintainGeometry(window, container)


ARGUMENTS

       Tk_Window window (in)             Window whose geometry is to  be  con-
                                         trolled.

       Tk_Window container (in)          Window  relative  to  which  window's
                                         geometry will be controlled.

       int x (in)                        Desired  x-coordinate  of  window  in
                                         container,  measured  in  pixels from
                                         the inside of container's left border
                                         to  the outside of window's left bor-
                                         der.

       int y (in)                        Desired  y-coordinate  of  window  in
                                         container,  measured  in  pixels from
                                         the inside of container's top  border
                                         to  the  outside of window's top bor-
                                         der.

       int width (in)                    Desired width for window, in  pixels.

       int height (in)                   Desired height for window, in pixels.
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DESCRIPTION

       Tk_MaintainGeometry and Tk_UnmaintainGeometry make it easier for geome-
       try  managers  to deal with windows whose containers are not their par-
       ents.  Three problems arise if the container for a window  is  not  its
       parent:

       [1]    The  x- and y-position of the window must be translated from the
              coordinate system of the container to that of the parent  before
              positioning the window.

       [2]    If  the container window, or any of its ancestors up to the win-
              dow's parent, is moved, then the  window  must  be  repositioned
              within its parent in order to maintain the correct position rel-
              ative to the container.

       [3]    If the container or one of its ancestors is mapped or  unmapped,
              then the window must be mapped or unmapped to correspond.

       None  of these problems is an issue if the parent and container are the
       same.  For example, if  the  container  or  one  of  its  ancestors  is
       unmapped, the window is automatically removed by the screen by X.

       Tk_MaintainGeometry  deals  with  these problems for windows whose con-
       tainers are not their parents, as well as handling the simpler case  of
       windows whose container are their parents.  Tk_MaintainGeometry is typ-
       ically called by a window manager once it has decided  where  a  window
       should  be  positioned  relative to its container.  Tk_MaintainGeometry
       translates the coordinates to the coordinate system of window's  parent
       and  then  moves and resizes the window appropriately.  Furthermore, it
       remembers the desired position and creates event  handlers  to  monitor
       the  container  and  all of its ancestors up to (but not including) the
       window's parent.   If  any  of  these  windows  is  moved,  mapped,  or
       unmapped,  the  window  will be adjusted so that it is mapped only when
       the container is mapped and its  geometry  relative  to  the  container
       remains as specified by x, y, width, and height.

       When  a  window  manager  relinquishes  control over a window, or if it
       decides that it does not want the window to appear on the screen  under
       any  conditions, it calls Tk_UnmaintainGeometry.  Tk_UnmaintainGeometry
       unmaps the window and cancels any previous calls to Tk_MaintainGeometry
       for the container-window pair, so that the window's geometry and mapped
       state are no longer  maintained  automatically.   Tk_UnmaintainGeometry
       need  not be called by a geometry manager if the window, the container,
       or any of the container's ancestors is  destroyed:   Tk  will  call  it
       automatically.

       If Tk_MaintainGeometry is called repeatedly for the same container-win-
       dow pair, the information from the  most  recent  call  supersedes  any
       older  information.   If  Tk_UnmaintainGeometry  is  called  for a con-
       tainer-window pair that is is not currently managed, the  call  has  no
       effect.


KEYWORDS

       geometry manager, map, container, parent, position, window, unmap



Tk                                    4.0               Tk_MaintainGeometry(3)

tk 8.6.11 - Generated Fri Jan 22 15:38:19 CST 2021
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