NAME
XCreateWindow, XCreateSimpleWindow, XSetWindowAttributes - create
windows and window attributes structure
SYNTAX
Window XCreateWindow(Display *display, Window parent, int x, int y,
unsigned int width, unsigned int height, unsigned int
border_width, int depth, unsigned int class, Visual *visual,
unsigned long valuemask, XSetWindowAttributes *attributes);
Window XCreateSimpleWindow(Display *display, Window parent, int x, int
y, unsigned int width, unsigned int height, unsigned int
border_width, unsigned long border, unsigned long background);
ARGUMENTS
attributes
Specifies the structure from which the values (as specified
by the value mask) are to be taken. The value mask should
have the appropriate bits set to indicate which attributes
have been set in the structure.
background
Specifies the background pixel value of the window.
border Specifies the border pixel value of the window.
border_width
Specifies the width of the created window’s border in pixels.
class Specifies the created window’s class. You can pass
InputOutput, InputOnly, or CopyFromParent. A class of
CopyFromParent means the class is taken from the parent.
depth Specifies the window’s depth. A depth of CopyFromParent
means the depth is taken from the parent.
display Specifies the connection to the X server.
parent Specifies the parent window.
valuemask Specifies which window attributes are defined in the
attributes argument. This mask is the bitwise inclusive OR
of the valid attribute mask bits. If valuemask is zero, the
attributes are ignored and are not referenced.
visual Specifies the visual type. A visual of CopyFromParent means
the visual type is taken from the parent.
width
height Specify the width and height, which are the created window’s
inside dimensions and do not include the created window’s
borders.
x
y Specify the x and y coordinates, which are the top-left
outside corner of the window’s borders and are relative to
the inside of the parent window’s borders.
DESCRIPTION
The XCreateWindow function creates an unmapped subwindow for a
specified parent window, returns the window ID of the created window,
and causes the X server to generate a CreateNotify event. The created
window is placed on top in the stacking order with respect to siblings.
The coordinate system has the X axis horizontal and the Y axis vertical
with the origin [0, 0] at the upper-left corner. Coordinates are
integral, in terms of pixels, and coincide with pixel centers. Each
window and pixmap has its own coordinate system. For a window, the
origin is inside the border at the inside, upper-left corner.
The border_width for an InputOnly window must be zero, or a BadMatch
error results. For class InputOutput, the visual type and depth must
be a combination supported for the screen, or a BadMatch error results.
The depth need not be the same as the parent, but the parent must not
be a window of class InputOnly, or a BadMatch error results. For an
InputOnly window, the depth must be zero, and the visual must be one
supported by the screen. If either condition is not met, a BadMatch
error results. The parent window, however, may have any depth and
class. If you specify any invalid window attribute for a window, a
BadMatch error results.
The created window is not yet displayed (mapped) on the user’s display.
To display the window, call XMapWindow. The new window initially uses
the same cursor as its parent. A new cursor can be defined for the new
window by calling XDefineCursor. The window will not be visible on the
screen unless it and all of its ancestors are mapped and it is not
obscured by any of its ancestors.
XCreateWindow can generate BadAlloc BadColor, BadCursor, BadMatch,
BadPixmap, BadValue, and BadWindow errors.
The XCreateSimpleWindow function creates an unmapped InputOutput
subwindow for a specified parent window, returns the window ID of the
created window, and causes the X server to generate a CreateNotify
event. The created window is placed on top in the stacking order with
respect to siblings. Any part of the window that extends outside its
parent window is clipped. The border_width for an InputOnly window
must be zero, or a BadMatch error results. XCreateSimpleWindow
inherits its depth, class, and visual from its parent. All other
window attributes, except background and border, have their default
values.
XCreateSimpleWindow can generate BadAlloc, BadMatch, BadValue, and
BadWindow errors.
STRUCTURES
The XSetWindowAttributes structure contains:
/* Window attribute value mask bits */
#define CWBackPixmap (1L<<0)
#define CWBackPixel (1L<<1)
#define CWBorderPixmap (1L<<2)
#define CWBorderPixel (1L<<3)
#define CWBitGravity (1L<<4)
#define CWWinGravity (1L<<5)
#define CWBackingStore (1L<<6)
#define CWBackingPlanes (1L<<7)
#define CWBackingPixel (1L<<8)
#define CWOverrideRedirect (1L<<9)
#define CWSaveUnder (1L<<10)
#define CWEventMask (1L<<11)
#define CWDontPropagate (1L<<12)
#define CWColormap (1L<<13)
#define CWCursor (1L<<14)
/* Values */
typedef struct {
Pixmap background_pixmap;/* background, None, or ParentRelative */
unsigned long background_pixel;/* background pixel */
Pixmap border_pixmap; /* border of the window or CopyFromParent */
unsigned long border_pixel;/* border pixel value */
int bit_gravity; /* one of bit gravity values */
int win_gravity; /* one of the window gravity values */
int backing_store; /* NotUseful, WhenMapped, Always */
unsigned long backing_planes;/* planes to be preserved if possible */
unsigned long backing_pixel;/* value to use in restoring planes */
Bool save_under; /* should bits under be saved? (popups) */
long event_mask; /* set of events that should be saved */
long do_not_propagate_mask;/* set of events that should not propagate */
Bool override_redirect; /* boolean value for override_redirect */
Colormap colormap; /* color map to be associated with window */
Cursor cursor; /* cursor to be displayed (or None) */
} XSetWindowAttributes;
For a detailed explanation of the members of this structure, see Xlib -
C Language X Interface.
DIAGNOSTICS
BadAlloc The server failed to allocate the requested resource or
server memory.
BadColor A value for a Colormap argument does not name a defined
Colormap.
BadCursor A value for a Cursor argument does not name a defined Cursor.
BadMatch The values do not exist for an InputOnly window.
BadMatch Some argument or pair of arguments has the correct type and
range but fails to match in some other way required by the
request.
BadPixmap A value for a Pixmap argument does not name a defined Pixmap.
BadValue Some numeric value falls outside the range of values accepted
by the request. Unless a specific range is specified for an
argument, the full range defined by the argument’s type is
accepted. Any argument defined as a set of alternatives can
generate this error.
BadWindow A value for a Window argument does not name a defined Window.
SEE ALSO
XChangeWindowAttributes(3), XConfigureWindow(3), XDefineCursor(3),
XDestroyWindow(3), XMapWindow(3), XRaiseWindow(3), XUnmapWindow(3)
Xlib - C Language X Interface