(octave.info)GUI Utility Functions

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35.4 GUI Utility Functions
==========================

These functions do not implement a GUI element but are useful when
developing programs that do.  The functions ‘uiwait’, ‘uiresume’, and
‘waitfor’ are only available with the ‘qt’ or ‘fltk’ toolkits.

 -- : DATA = guidata (H)
 -- : guidata (H, DATA)
     Query or set user-custom GUI data.

     The GUI data is stored in the figure handle H.  If H is not a
     figure handle then it’s parent figure will be used for storage.

     DATA must be a single object which means it is usually preferable
     for it to be a data container such as a cell array or struct so
     that additional data items can be added easily.

     See also: Note: getappdata, *note setappdata:
     XREFsetappdata, Note: get, Note: set, Note:
     getpref, Note: setpref.

 -- : HDATA = guihandles (H)
 -- : HDATA = guihandles
     Return a structure of object handles for the figure associated with
     handle H.

     If no handle is specified the current figure returned by ‘gcf’ is
     used.

     The fieldname for each entry of HDATA is taken from the "tag"
     property of the graphic object.  If the tag is empty then the
     handle is not returned.  If there are multiple graphic objects with
     the same tag then the entry in HDATA will be a vector of handles.
     ‘guihandles’ includes all possible handles, including those for
     which "HandleVisibility" is "off".

     See also: Note: guidata, Note: findobj,
     Note: findall, Note: allchild.

 -- : have_window_system ()
     Return true if a window system is available (X11, Windows, or Apple
     OS X) and false otherwise.

     See also: Note: isguirunning.

 -- : isguirunning ()
     Return true if Octave is running in GUI mode and false otherwise.

     See also: Note: have_window_system.

 -- : openvar (NAME)
     Open the variable NAME in the graphical Variable Editor.

 -- : uiwait
 -- : uiwait (H)
 -- : uiwait (H, TIMEOUT)
     Suspend program execution until the figure with handle H is deleted
     or ‘uiresume’ is called.

     When no figure handle is specified this function uses the current
     figure.  If the figure handle is invalid or there is no current
     figure, this functions returns immediately.

     When specified, TIMEOUT defines the number of seconds to wait for
     the figure deletion or the ‘uiresume’ call.  The timeout value must
     be at least 1.  If a smaller value is specified, a warning is
     issued and a timeout value of 1 is used instead.  If a non-integer
     value is specified, it is truncated towards 0.  If TIMEOUT is not
     specified, the program execution is suspended indefinitely.

     See also: Note: uiresume, Note: waitfor.

 -- : uiresume (H)
     Resume program execution suspended with ‘uiwait’.

     The handle H must be the same as the on specified in ‘uiwait’.  If
     the handle is invalid or there is no ‘uiwait’ call pending for the
     figure with handle H, this function does nothing.

     See also: Note: uiwait.

 -- : waitfor (H)
 -- : waitfor (H, PROP)
 -- : waitfor (H, PROP, VALUE)
 -- : waitfor (..., "timeout", TIMEOUT)
     Suspend the execution of the current program until a condition is
     satisfied on the graphics handle H.

     While the program is suspended graphics events are still processed
     normally, allowing callbacks to modify the state of graphics
     objects.  This function is reentrant and can be called from a
     callback, while another ‘waitfor’ call is pending at the top-level.

     In the first form, program execution is suspended until the
     graphics object H is destroyed.  If the graphics handle is invalid,
     the function returns immediately.

     In the second form, execution is suspended until the graphics
     object is destroyed or the property named PROP is modified.  If the
     graphics handle is invalid or the property does not exist, the
     function returns immediately.

     In the third form, execution is suspended until the graphics object
     is destroyed or the property named PROP is set to VALUE.  The
     function ‘isequal’ is used to compare property values.  If the
     graphics handle is invalid, the property does not exist or the
     property is already set to VALUE, the function returns immediately.

     An optional timeout can be specified using the property "timeout".
     This timeout value is the number of seconds to wait for the
     condition to be true.  TIMEOUT must be at least 1.  If a smaller
     value is specified, a warning is issued and a value of 1 is used
     instead.  If the timeout value is not an integer, it is truncated
     towards 0.

     To define a condition on a property named "timeout", use the string
     ’\timeout’ instead.

     In all cases, typing CTRL-C stops program execution immediately.

     See also: Note: waitforbuttonpress, Note:
     isequal.