XAllocWMHints(3)



1991.

NAME

       XAllocWMHints, XSetWMHints, XGetWMHints, XWMHints - allocate window
       manager hints structure and set or read a window's WM_HINTS property

SYNTAX

       XWMHints *XAllocWMHints(void);

       int XSetWMHints(Display *display, Window w, XWMHints *wmhints);

       XWMHints *XGetWMHints(Display *display, Window w);

ARGUMENTS

       display   Specifies the connection to the X server.

       w         Specifies the window.

       wmhints   Specifies the XWMHints structure to be used.

DESCRIPTION

       The XAllocWMHints function allocates and returns a pointer to a
       XWMHints structure.  Note that all fields in the XWMHints structure are
       initially set to zero.  If insufficient memory is available, XAl-
       locWMHints returns NULL.  To free the memory allocated to this struc-
       ture, use XFree.

       The XSetWMHints function sets the window manager hints that include
       icon information and location, the initial state of the window, and
       whether the application relies on the window manager to get keyboard
       input.

       XSetWMHints can generate BadAlloc and BadWindow errors.

       The XGetWMHints function reads the window manager hints and returns
       NULL if no WM_HINTS property was set on the window or returns a pointer
       to a XWMHints structure if it succeeds.  When finished with the data,
       free the space used for it by calling XFree.

       XGetWMHints can generate a BadWindow error.

PROPERTIES

       WM_HINTS  Additional hints set by the client for use by the window man-
                 ager.  The C type of this property is XWMHints.

STRUCTURES

       The XWMHints structure contains:

       /* Window manager hints mask bits */

       #define   InputHint                   (1L << 0)
       #define   StateHint                   (1L << 1)
       #define   IconPixmapHint              (1L << 2)
       #define   IconWindowHint              (1L << 3)
       #define   IconPositionHint            (1L << 4)
       #define   IconMaskHint                (1L << 5)
       #define   WindowGroupHint             (1L << 6)
       #define   XUrgencyHint                (1L << 8)

       #define   AllHints                    (InputHint|State-
                                             Hint|IconPixmapHint|
                                             IconWindowHint|IconPosi-
                                             tionHint|
                                             IconMaskHint|Window-
                                             GroupHint)
       /* Values */

       typedef struct {
            long flags;         /* marks which fields in this structure are defined */
            Bool input;         /* does this application rely on the window manager to
                                get keyboard input? */
            int initial_state;  /* see below */
            Pixmap icon_pixmap; /* pixmap to be used as icon */
            Window icon_window; /* window to be used as icon */
            int icon_x, icon_y; /* initial position of icon */
            Pixmap icon_mask;   /* pixmap to be used as mask for icon_pixmap */
            XID window_group;   /* id of related window group */
            /* this structure may be extended in the future */
       } XWMHints;

       The input member is used to communicate to the window manager the input
       focus model used by the application.  Applications that expect input
       but never explicitly set focus to any of their subwindows (that is, use
       the push model of focus management), such as X Version 10 style appli-
       cations that use real-estate driven focus, should set this member to
       True.  Similarly, applications that set input focus to their subwindows
       only when it is given to their top-level window by a window manager
       should also set this member to True.  Applications that manage their
       own input focus by explicitly setting focus to one of their subwindows
       whenever they want keyboard input (that is, use the pull model of focus
       management) should set this member to False.  Applications that never
       expect any keyboard input also should set this member to False.

       Pull model window managers should make it possible for push model
       applications to get input by setting input focus to the top-level win-
       dows of applications whose input member is True.  Push model window
       managers should make sure that pull model applications do not break
       them by resetting input focus to PointerRoot when it is appropriate
       (for example, whenever an application whose input member is False sets
       input focus to one of its subwindows).

       The definitions for the initial_state flag are:

       #define   WithdrawnState         0
       #define   NormalState            1    /* most applications start
                                             this way */
       #define   IconicState            3    /* application wants to
                                             start as an icon */
       The icon_mask specifies which pixels of the icon_pixmap should be used
       as the icon.  This allows for nonrectangular icons.  Both icon_pixmap
       and icon_mask must be bitmaps.  The icon_window lets an application
       provide a window for use as an icon for window managers that support
       such use.  The window_group lets you specify that this window belongs
       to a group of other windows.  For example, if a single application
       manipulates multiple top-level windows, this allows you to provide
       enough information that a window manager can iconify all of the windows
       rather than just the one window.

       The UrgencyHint flag, if set in the flags field, indicates that the
       client deems the window contents to be urgent, requiring the timely
       response of the user.  The window manager will make some effort to draw
       the user's attention to this window while this flag is set.  The client
       must provide some means by which the user can cause the urgency flag to
       be cleared (either mitigating the condition that made the window urgent
       or merely shutting off the alarm) or the window to be withdrawn.

DIAGNOSTICS

       BadAlloc  The server failed to allocate the requested resource or
                 server memory.

       BadWindow A value for a Window argument does not name a defined Window.

XAllocWMHints(3)

NAME

SYNTAX

ARGUMENTS

DESCRIPTION

PROPERTIES

STRUCTURES

DIAGNOSTICS

SEE ALSO