4. Other Root Window Messages



Pagers wanting to close a window MUST send a _NET_CLOSE_WINDOW client message request to the root window:

  window = window to close
  message_type = _NET_CLOSE_WINDOW
  format = 32
  data.l[0] = 0 /* may be used later */

The Window Manager MUST then attempt to close the window specified.

Rationale: A Window Manager might be more clever than the usual method (send WM_DELETE message if the protocol is selected, XKillClient otherwise). It might introduce a timeout, for example. Instead of duplicating the code, the Window Manager can easily do the job.


  window = window to be moved or resized
  message_type = _NET_WM_MOVERESIZE
  format = 32
  data.l[0] = x_root 
  data.l[1] = y_root
  data.l[2] = direction
  data.l[3] = button

This message allows an application to initiate window movement or resizing. This allows the application to define its own move and size "grips", whilst letting the window manager control the actual operation. This means that all moves/resizes can happen in a consistent manner as defined by the WM.

When sending this message in response to a button press event, button SHOULD indicate the button which was pressed, x_root and y_root MUST indicate the position of the button press with respect to the root window and direction MUST indicate whether this is a move or resize event, and if it is a resize event, which edges of the window the size grip applies to. When sending this message in response to a key event, the direction MUST indicate wether this this is a move or resize event and the other fields are unused.

#define _NET_WM_MOVERESIZE_SIZE_TOP          1
#define _NET_WM_MOVERESIZE_SIZE_LEFT         7
#define _NET_WM_MOVERESIZE_MOVE              8   /* movement only */
#define _NET_WM_MOVERESIZE_SIZE_KEYBOARD     9   /* size via keyboard */
#define _NET_WM_MOVERESIZE_MOVE_KEYBOARD    10   /* move via keyboard */

The Client MUST release all grabs prior to sending such message.

The Window Manager can use the button field to determine the events on which it terminates the operation initiated by the _NET_WM_MOVERESIZE message. Since there is a race condition between client sending the _NET_WM_MOVERESIZE message and the user releasing the button, Window Managers are advised to offer some other means to terminate the operation, e.g. by pressing the ESC key.