Provided by: libx11-doc_1.8.4-2_all 
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, XAllocWMHints returns NULL. To free the memory allocated to this
structure, 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 manager. 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|
StateHint|
IconPixmapHint|
IconWindowHint|
IconPositionHint|
IconMaskHint|
WindowGroupHint)
/* 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 applications 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 windows 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.
SEE ALSO
XAllocClassHint(3), XAllocIconSize(3), XAllocSizeHints(3), XFree(3), XSetCommand(3),
XSetTransientForHint(3), XSetTextProperty(3), XSetWMClientMachine(3),
XSetWMColormapWindows(3), XSetWMIconName(3), XSetWMName(3), XSetWMProperties(3),
XSetWMProtocols(3), XStringListToTextProperty(3)
Xlib - C Language X Interface, O'Reilly and Associates, Sebastopol, 1991.