XAllocSizeHints
XAllocSizeHints(3X11) XLIB FUNCTIONS XAllocSizeHints(3X11)
NAME
XAllocSizeHints, XSetWMNormalHints, XGetWMNormalHints, XSetWMSize-
Hints, XGetWMSizeHints, XSizeHints - allocate size hints structure and
set or read a window’s WM_NORMAL_HINTS property
SYNTAX
XSizeHints *XAllocSizeHints(void);
void XSetWMNormalHints(Display *display, Window w, XSizeHints *hints);
Status XGetWMNormalHints(Display *display, Window w, XSizeHints
*hints_return, long *supplied_return);
void XSetWMSizeHints(Display *display, Window w, XSizeHints *hints,
Atom property);
Status XGetWMSizeHints(Display *display, Window w, XSizeHints
*hints_return, long *supplied_return, Atom property);
ARGUMENTS
display Specifies the connection to the X server.
hints Specifies the size hints for the window in its normal state.
hints Specifies the XSizeHints structure to be used.
hints_return
Returns the size hints for the window in its normal state.
property Specifies the property name.
supplied_return
Returns the hints that were supplied by the user.
w Specifies the window.
DESCRIPTION
The XAllocSizeHints function allocates and returns a pointer to a
XSizeHints structure. Note that all fields in the XSizeHints struc-
ture are initially set to zero. If insufficient memory is available,
XAllocSizeHints returns NULL. To free the memory allocated to this
structure, use XFree.
The XSetWMNormalHints function replaces the size hints for the WM_NOR-
MAL_HINTS property on the specified window. If the property does not
already exist, XSetWMNormalHints sets the size hints for the WM_NOR-
MAL_HINTS property on the specified window. The property is stored
with a type of WM_SIZE_HINTS and a format of 32.
XSetWMNormalHints can generate BadAlloc and BadWindow errors.
The XGetWMNormalHints function returns the size hints stored in the
WM_NORMAL_HINTS property on the specified window. If the property is
of type WM_SIZE_HINTS, is of format 32, and is long enough to contain
either an old (pre-ICCCM) or new size hints structure, XGetWMNormal-
Hints sets the various fields of the XSizeHints structure, sets the
supplied_return argument to the list of fields that were supplied by
the user (whether or not they contained defined values), and returns a
nonzero status. Otherwise, it returns a zero status.
If XGetWMNormalHints returns successfully and a pre-ICCCM size hints
property is read, the supplied_return argument will contain the
following bits:
(USPosition|USSize|PPosition|PSize|PMinSize|
PMaxSize|PResizeInc|PAspect)
If the property is large enough to contain the base size and window
gravity fields as well, the supplied_return argument will also contain
the following bits:
PBaseSize|PWinGravity
XGetWMNormalHints can generate a PN BadWindow error.
The XSetWMSizeHints function replaces the size hints for the specified
property on the named window. If the specified property does not
already exist, XSetWMSizeHints sets the size hints for the specified
property on the named window. The property is stored with a type of
WM_SIZE_HINTS and a format of 32. To set a window’s normal size
hints, you can use the XSetWMNormalHints function.
XSetWMSizeHints can generate BadAlloc, BadAtom, and BadWindow errors.
The XGetWMSizeHints function returns the size hints stored in the
specified property on the named window. If the property is of type
WM_SIZE_HINTS, is of format 32, and is long enough to contain either
an old (pre-ICCCM) or new size hints structure, XGetWMSizeHints sets
the various fields of the XSizeHints structure, sets the sup-
plied_return argument to the list of fields that were supplied by the
user (whether or not they contained defined values), and returns a
nonzero status. Otherwise, it returns a zero status. To get a win-
dow’s normal size hints, you can use the XGetWMNormalHints function.
If XGetWMSizeHints returns successfully and a pre-ICCCM size hints
property is read, the supplied_return argument will contain the fol-
lowing bits:
(USPosition|USSize|PPosition|PSize|PMinSize|
PMaxSize|PResizeInc|PAspect);
If the property is large enough to contain the base size and window
gravity fields as well, the supplied_return argument will also contain
the following bits:
PBaseSize|PWinGravity
XGetWMSizeHints can generate BadAtom and BadWindow errors.
PROPERTIES
WM_NORMAL_HINTS
Size hints for a window in its normal state. The C type of
this property is XSizeHints.
STRUCTURES
The XSizeHints structure contains:
/∗ Size hints mask bits */
#define USPosition (1L << 0) /∗ user specified x, y */
#define USSize (1L << 1) /∗ user specified width, height
*/
#define PPosition (1L << 2) /∗ program specified position
*/
#define PSize (1L << 3) /∗ program specified size */
#define PMinSize (1L << 4) /∗ program specified minimum
size */
#define PMaxSize (1L << 5) /∗ program specified maximum
size */
#define PResizeInc (1L << 6) /∗ program specified resize
increments */
#define PAspect (1L << 7) /∗ program specified min and
max aspect ratios */
#define PBaseSize (1L << 8)
#define PWinGravity (1L << 9)
#define PAllHints (PPosi-
tion|PSize|
PMinSize|PMax-
Size|
PRe-
sizeInc|PAspect)
/∗ Values */
typedef struct {
long flags; /∗ marks which fields in this structure are defined */
int x, y; /∗ Obsolete */
int width, height; /∗ Obsolete */
int min_width, min_height;
int max_width, max_height;
int width_inc, height_inc;
struct {
int x; /∗ numerator */
int y; /∗ denominator */
} min_aspect, max_aspect;
int base_width, base_height;
int win_gravity;
/∗ this structure may be extended in the future */
} XSizeHints;
The x, y, width, and height members are now obsolete and are left
solely for compatibility reasons. The min_width and min_height mem-
bers specify the minimum window size that still allows the application
to be useful. The max_width and max_height members specify the maxi-
mum window size. The width_inc and height_inc members define an
arithmetic progression of sizes (minimum to maximum) into which the
window prefers to be resized. The min_aspect and max_aspect members
are expressed as ratios of x and y, and they allow an application to
specify the range of aspect ratios it prefers. The base_width and
base_height members define the desired size of the window. The window
manager will interpret the position of the window and its border width
to position the point of the outer rectangle of the overall window
specified by the win_gravity member. The outer rectangle of the win-
dow includes any borders or decorations supplied by the window man-
ager. In other words, if the window manager decides to place the win-
dow where the client asked, the position on the parent window’s border
named by the win_gravity will be placed where the client window would
have been placed in the absence of a window manager.
Note that use of the PAllHints macro is highly discouraged.
DIAGNOSTICS
BadAlloc The server failed to allocate the requested resource or
server memory.
BadAtom A value for an Atom argument does not name a defined Atom.
BadWindow A value for a Window argument does not name a defined Win-
dow.
SEE ALSO
XAllocClassHint(3X11), XAllocIconSize(3X11), XAllocWMHints(3X11),
XFree(3X11), XSetCommand(3X11), XSetTransientForHint(3X11), XSet-
TextProperty(3X11), XSetWMClientMachine(3X11),
XSetWMColormapWindows(3X11), XSetWMIconName(3X11), XSetWMName(3X11),
XSetWMProperties(3X11), XSetWMProtocols(3X11), XStringListToTextProp-
erty(3X11)
Xlib - C Language X Interface, O’Reilly and Associates,
XAllocSizeHints(3X11)
