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XGetWindowAttributes(3X11) manual page
Table of Contents
XGetWindowAttributes,
XGetGeometry, XWindowAttributes - get current window attribute or geometry
and current window attributes structure
Status XGetWindowAttributes(display,
w, window_attributes_return)
Display *display;
Window w;
XWindowAttributes *window_attributes_return;
Status XGetGeometry(display, d, root_return, x_return, y_return, width_return,
height_return, border_width_return, depth_return)
Display *display;
Drawable d;
Window *root_return;
int *x_return, *y_return;
unsigned int *width_return, *height_return;
unsigned int *border_width_return;
unsigned int *depth_return;
- border_width_return
- Returns the border width in pixels.
- d
- Specifies
the drawable, which can be a window or a pixmap.
- depth_return
- Returns the
depth of the drawable (bits per pixel for the object).
- display
- Specifies
the connection to the X server.
- root_return
- Returns the root window.
- w
- Specifies
the window whose current attributes you want to obtain.
- width_return
- height_return
- Return the drawable's dimensions (width and height).
- window_attributes_return
- Returns
the specified window's attributes in the XWindowAttributes structure.
- x_return
- y_return
- Return the x and y coordinates that define the location of the
drawable. For a window, these coordinates specify the upper-left outer corner
relative to its parent's origin. For pixmaps, these coordinates are always
zero.
The XGetWindowAttributes function returns the current
attributes for the specified window to an XWindowAttributes structure.
XGetWindowAttributes can generate BadDrawable and BadWindow errors.
The XGetGeometry function returns the root window and the current geometry
of the drawable. The geometry of the drawable includes the x and y coordinates,
width and height, border width, and depth. These are described in the argument
list. It is legal to pass to this function a window whose class is InputOnly.
The XWindowAttributes structure contains:
typedef struct {
int x, y; /* location of window */
int width, height; /* width and height of window */
int border_width; /* border width of window */
int depth; /* depth of window */
Visual *visual; /* the associated visual structure */
Window root; /* root of screen containing window */
int class; /* InputOutput, InputOnly*/
int bit_gravity; /* one of the 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 be used when restoring planes */
Bool save_under; /* boolean, should bits under be saved? */
Colormap colormap; /* color map to be associated with window */
Bool map_installed; /* boolean, is color map currently installed*/
int map_state; /* IsUnmapped, IsUnviewable, IsViewable */
long all_event_masks; /* set of events all people have interest in*/
long your_event_mask; /* my event mask */
long do_not_propagate_mask; /* set of events that should not propagate */
Bool override_redirect; /* boolean value for override-redirect */
Screen *screen; /* back pointer to correct screen */
} XWindowAttributes;
The x and y members are set to the upper-left outer corner relative to
the parent window's origin. The width and height members are set to the inside
size of the window, not including the border. The border_width member is
set to the window's border width in pixels. The depth member is set to the
depth of the window (that is, bits per pixel for the object). The visual
member is a pointer to the screen's associated Visual structure. The root
member is set to the root window of the screen containing the window. The
class member is set to the window's class and can be either InputOutput
or InputOnly.
The bit_gravity member is set to the window's bit gravity
and can be one of the following:
ForgetGravity |
EastGravity T} |
NorthWestGravity
|
SouthWestGravity T} |
NorthGravity |
SouthGravity T} |
NorthEastGravity
|
SouthEastGravity T} |
WestGravity |
StaticGravity T} |
CenterGravity
The win_gravity member is set to the window's window gravity and can be
one of the following:
UnmapGravity |
EastGravity T} |
NorthWestGravity
|
SouthWestGravity T} |
NorthGravity |
SouthGravity T} |
NorthEastGravity
|
SouthEastGravity T} |
WestGravity |
StaticGravity T} |
CenterGravity
For additional information on gravity, see section 3.3.
The backing_store
member is set to indicate how the X server should maintain the contents
of a window and can be WhenMapped, Always, or NotUseful. The backing_planes
member is set to indicate (with bits set to 1) which bit planes of the
window hold dynamic data that must be preserved in backing_stores and
during save_unders. The backing_pixel member is set to indicate what values
to use for planes not set in backing_planes.
The save_under member is set
to True or False. The colormap member is set to the colormap for the
specified window and can be a colormap ID or None. The map_installed
member is set to indicate whether the colormap is currently installed
and can be True or False. The map_state member is set to indicate the
state of the window and can be IsUnmapped, IsUnviewable, or IsViewable.
IsUnviewable is used if the window is mapped but some ancestor is unmapped.
The all_event_masks member is set to the bitwise inclusive OR of all event
masks selected on the window by all clients. The your_event_mask member
is set to the bitwise inclusive OR of all event masks selected by the
querying client. The do_not_propagate_mask member is set to the bitwise
inclusive OR of the set of events that should not propagate.
The override_redirect
member is set to indicate whether this window overrides structure control
facilities and can be True or False. Window manager clients should
ignore the window if this member is True.
The screen member is set to
a screen pointer that gives you a back pointer to the correct screen. This
makes it easier to obtain the screen information without having to loop
over the root window fields to see which field matches.
- BadDrawable
- A value for a Drawable argument does not name a defined Window or Pixmap.
- BadWindow
- A value for a Window argument does not name a defined Window.
XQueryPointer(3X11)
, XQueryTree(3X11)
Xlib - C Language X Interface
Table of Contents
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