www.LinuxHowtos.org

xcb_create_window

Section: XCB Requests (3)
Updated: libxcb 1.12
Index Return to Main Contents

NAME

xcb_create_window - Creates a window

SYNOPSIS

#include <xcb/xproto.h>

Request function

: xcb_void_cookie_t xcb_create_window(xcb_connection_t *conn, uint8_t depth, xcb_window_t wid, xcb_window_t parent, int16_t x, int16_t y, uint16_t width, uint16_t height, uint16_t border_width, uint16_t _class, xcb_visualid_t visual, uint32_t value_mask, const void *value_list);

REQUEST ARGUMENTS

conn

The XCB connection to X11.

depth

Specifies the new window's depth (TODO: what unit?).

The special value XCB_COPY_FROM_PARENT means the depth is taken from the parent window.

wid

The ID with which you will refer to the new window, created by xcb_generate_id.

parent

The parent window of the new window.

x

The X coordinate of the new window.

y

The Y coordinate of the new window.

width

The width of the new window.

height

The height of the new window.

border_width

TODO:

Must be zero if the class is InputOnly or a xcb_match_error_t occurs.

_class

One of the following values:

XCB_WINDOW_CLASS_COPY_FROM_PARENT: TODO: NOT YET DOCUMENTED.
XCB_WINDOW_CLASS_INPUT_OUTPUT: TODO: NOT YET DOCUMENTED.
XCB_WINDOW_CLASS_INPUT_ONLY: TODO: NOT YET DOCUMENTED.

visual

Specifies the id for the new window's visual.

The special value XCB_COPY_FROM_PARENT means the visual is taken from the parent window.

value_mask

One of the following values:

XCB_CW_BACK_PIXMAP

Overrides the default background-pixmap. The background pixmap and window must have the same root and same depth. Any size pixmap can be used, although some sizes may be faster than others.

If XCB_BACK_PIXMAP_NONE is specified, the window has no defined background. The server may fill the contents with the previous screen contents or with contents of its own choosing.

If XCB_BACK_PIXMAP_PARENT_RELATIVE is specified, the parent's background is used, but the window must have the same depth as the parent (or a Match error results). The parent's background is tracked, and the current version is used each time the window background is required.

XCB_CW_BACK_PIXEL

Overrides BackPixmap. A pixmap of undefined size filled with the specified background pixel is used for the background. Range-checking is not performed, the background pixel is truncated to the appropriate number of bits.

XCB_CW_BORDER_PIXMAP

Overrides the default border-pixmap. The border pixmap and window must have the same root and the same depth. Any size pixmap can be used, although some sizes may be faster than others.

The special value XCB_COPY_FROM_PARENT means the parent's border pixmap is copied (subsequent changes to the parent's border attribute do not affect the child), but the window must have the same depth as the parent.

XCB_CW_BORDER_PIXEL

Overrides BorderPixmap. A pixmap of undefined size filled with the specified border pixel is used for the border. Range checking is not performed on the border-pixel value, it is truncated to the appropriate number of bits.

XCB_CW_BIT_GRAVITY

Defines which region of the window should be retained if the window is resized.

XCB_CW_WIN_GRAVITY

Defines how the window should be repositioned if the parent is resized (see ConfigureWindow).

XCB_CW_BACKING_STORE

A backing-store of WhenMapped advises the server that maintaining contents of obscured regions when the window is mapped would be beneficial. A backing-store of Always advises the server that maintaining contents even when the window is unmapped would be beneficial. In this case, the server may generate an exposure event when the window is created. A value of NotUseful advises the server that maintaining contents is unnecessary, although a server may still choose to maintain contents while the window is mapped. Note that if the server maintains contents, then the server should maintain complete contents not just the region within the parent boundaries, even if the window is larger than its parent. While the server maintains contents, exposure events will not normally be generated, but the server may stop maintaining contents at any time.

XCB_CW_BACKING_PLANES

The backing-planes indicates (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.

XCB_CW_BACKING_PIXEL

The backing-pixel specifies what value to use in planes not covered by backing-planes. The server is free to save only the specified bit planes in the backing-store or save-under and regenerate the remaining planes with the specified pixel value. Any bits beyond the specified depth of the window in these values are simply ignored.

XCB_CW_OVERRIDE_REDIRECT

The override-redirect specifies whether map and configure requests on this window should override a SubstructureRedirect on the parent, typically to inform a window manager not to tamper with the window.

XCB_CW_SAVE_UNDER

If 1, the server is advised that when this window is mapped, saving the contents of windows it obscures would be beneficial.

XCB_CW_EVENT_MASK

The event-mask defines which events the client is interested in for this window (or for some event types, inferiors of the window).

XCB_CW_DONT_PROPAGATE

The do-not-propagate-mask defines which events should not be propagated to ancestor windows when no client has the event type selected in this window.

XCB_CW_COLORMAP

The colormap specifies the colormap that best reflects the true colors of the window. Servers capable of supporting multiple hardware colormaps may use this information, and window man- agers may use it for InstallColormap requests. The colormap must have the same visual type and root as the window (or a Match error results). If CopyFromParent is specified, the parent's colormap is copied (subsequent changes to the parent's colormap attribute do not affect the child). However, the window must have the same visual type as the parent (or a Match error results), and the parent must not have a colormap of None (or a Match error results). For an explanation of None, see FreeColormap request. The colormap is copied by sharing the colormap object between the child and the parent, not by making a complete copy of the colormap contents.

XCB_CW_CURSOR

If a cursor is specified, it will be used whenever the pointer is in the window. If None is speci- fied, the parent's cursor will be used when the pointer is in the window, and any change in the parent's cursor will cause an immediate change in the displayed cursor.

: TODO: NOT YET DOCUMENTED.

value_list

TODO: NOT YET DOCUMENTED.

DESCRIPTION

Creates an unmapped window as child of the specified parent window. A CreateNotify event will be generated. The new 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 created window is not yet displayed (mapped), call xcb_map_window to display it.

The created window will initially use the same cursor as its parent.

RETURN VALUE

Returns an xcb_void_cookie_t. Errors (if any) have to be handled in the event loop.

If you want to handle errors directly with xcb_request_check instead, use xcb_create_window_checked. See xcb-requests(3) for details.

ERRORS

xcb_alloc_error_t: The X server could not allocate the requested resources (no memory?).
xcb_colormap_error_t: TODO: reasons?
xcb_cursor_error_t: TODO: reasons?
xcb_match_error_t: TODO: reasons?
xcb_pixmap_error_t: TODO: reasons?
xcb_value_error_t: TODO: reasons?
xcb_window_error_t: TODO: reasons?

AUTHOR

Generated from xproto.xml. Contact xcb@lists.freedesktop.org for corrections and improvements.

Index

NAME

SYNOPSIS

Request function

REQUEST ARGUMENTS