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- clear area or window
- int XClearArea(Display *display, Window w,
- int y, unsigned width, unsigned height, Bool exposures);
- int XClearWindow(Display
*display, Window w);
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
- Specifies the connection to the X
- Specifies a Boolean value that indicates if Expose events
are to be generated.
- Specifies the window.
- Specify the width and height, which are the dimensions of the rectangle.
- Specify the x and y coordinates, which are relative to the origin of
the window and specify the upper-left corner of the rectangle.
XClearArea can generate BadMatch, BadValue, and BadWindow
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.
can generate BadMatch and BadWindow errors.
An InputOnly window is used as a Drawable.
- 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
- A value for a Window argument does not name a defined
Xlib - C Language X Interface
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