XAllocWMHints(3X11)XAllocWMHints(3X11)NAME
XAllocWMHints, XSetWMHints, XGetWMHints, XWMHints - allocate window
manager hints structure and set or read a window's WM_HINTS property
SYNOPSIS
XWMHints *XAllocWMHints()
XSetWMHints(display, w, wmhints)
Display *display;
Window w;
XWMHints *wmhints;
XWMHints *XGetWMHints(display, w)
Display *display;
Window w;
ARGUMENTS
Specifies the connection to the X server. Specifies the window. Spec‐
ifies 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
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 UrgencyHint (1L << 8)
#define AllHints (InputHint|StateHint|IconPixmapHint|
IconWindowHint|IconPositionHint| Icon‐
MaskHint|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 applica‐
tions 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 man‐
agers 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 mul‐
tiple 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
The server failed to allocate the requested resource or server memory.
A value for a Window argument does not name a defined Window.
SEE ALSOXAllocClassHint(3X11), XAllocIconSize(3X11), XAllocSizeHints(3X11),
XFree(3X11), XSetCommand(3X11), XSetTransientForHint(3X11), XSet‐
TextProperty(3X11), XSetWMClientMachine(3X11), XSetWMColormapWin‐
dows(3X11), XSetWMIconName(3X11), XSetWMName(3X11), XSetWMProper‐
ties(3X11), XSetWMProtocols(3X11), XStringListToTextProperty(3X11)
Xlib -- C Language X Interface
XAllocWMHints(3X11)
