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XClearArea, XClearWindow
- clear area or window
XClearArea(display, w, x, y, width, height,
exposures)
Display *display;
Window w;
int x, y;
unsigned int width, height;
Bool exposures;
XClearWindow(display, w)
Display *display;
Window w;
- display
- Specifies the connection to the X server.
- exposures
- Specifies
a Boolean value that indicates if Expose events are to be generated.
- w
- Specifies
the window.
- width
- height
- Specify the width and height, which are the dimensions of the rectangle.
and specify the upper-left corner of the rectangle
- x
- y
- Specify the x and y coordinates, which are relative to the origin of
the window.
The XClearArea function paints a rectangular area
in the specified window according to the specified dimensions with the
window's background pixel or pixmap. The subwindow-mode effectively is ClipByChildren.
If width is zero, it is replaced with the current width of the window
minus x. If height is zero, it is replaced with the current height of the
window minus y. If the window has a defined background tile, the rectangle
clipped by any children is filled with this tile. If the window has background
None, the contents of the window are not changed. In either case, if
exposures is True, one or more Expose events are generated for regions
of the rectangle that are either visible or are being retained in a backing
store. If you specify a window whose class is InputOnly, a BadMatch
error results.
XClearArea can generate BadMatch, BadValue, and BadWindow
errors.
The XClearWindow function clears the entire area in the specified
window and is equivalent to XClearArea (display, w, 0, 0, 0, 0, False).
If the window has a defined background tile, the rectangle is tiled with
a plane-mask of all ones and GXcopy function. If the window has background
None, the contents of the window are not changed. If you specify a
window whose class is InputOnly, a BadMatch error results.
XClearWindow
can generate BadMatch and BadWindow errors.
- BadMatch
-
An InputOnly window is used as a Drawable.
- 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.
XCopyArea(3X11)
Xlib - C Language X Interface
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