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- XSetDeviceFocus(3X11) X FUNCTIONS XSetDeviceFocus(3X11)
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- NNAAMMEE
- XSetDeviceFocus, XGetDeviceFocus - control extension input
- device focus
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- SSYYNNTTAAXX
- XSetDeviceFocus(_d_i_s_p_l_a_y, _d_e_v_i_c_e, _f_o_c_u_s, _r_e_v_e_r_t___t_o, _t_i_m_e)
- Display *_d_i_s_p_l_a_y;
- Display *_d_e_v_i_c_e;
- Window _f_o_c_u_s;
- int _r_e_v_e_r_t___t_o;
- Time _t_i_m_e;
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- XGetDeviceFocus(_d_i_s_p_l_a_y, _d_e_v_i_c_e, _f_o_c_u_s___r_e_t_u_r_n,
- _r_e_v_e_r_t___t_o___r_e_t_u_r_n, _t_i_m_e___r_e_t_u_r_n)
- Display *_d_i_s_p_l_a_y;
- Display *_d_e_v_i_c_e;
- Window *_f_o_c_u_s___r_e_t_u_r_n;
- int *_r_e_v_e_r_t___t_o___r_e_t_u_r_n;
- int *_t_i_m_e___r_e_t_u_r_n;
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- AARRGGUUMMEENNTTSS
- _d_i_s_p_l_a_y Specifies the connection to the X server.
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- _d_e_v_i_c_e Specifies the device whose focus is to be
- queried or changed.
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- _f_o_c_u_s Specifies the window, _P_o_i_n_t_e_r_R_o_o_t, _F_o_l_l_o_w_K_e_y_-
- _b_o_a_r_d, or _N_o_n_e.
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- _f_o_c_u_s___r_e_t_u_r_n
- Returns the focus window, _P_o_i_n_t_e_r_R_o_o_t, _F_o_l_-
- _l_o_w_K_e_y_b_o_a_r_d, or _N_o_n_e.
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- _r_e_v_e_r_t___t_o Specifies where the input focus reverts to if
- the window becomes not viewable. You can pass
- _R_e_v_e_r_t_T_o_P_a_r_e_n_t, _R_e_v_e_r_t_T_o_P_o_i_n_t_e_r_R_o_o_t, _R_e_v_e_r_t_T_o_-
- _F_o_l_l_o_w_K_e_y_b_o_a_r_d, or _R_e_v_e_r_t_T_o_N_o_n_e.
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- _r_e_v_e_r_t___t_o___r_e_t_u_r_n
- Returns the current focus state _R_e_v_e_r_t_T_o_P_a_r_-
- _e_n_t, _R_e_v_e_r_t_T_o_P_o_i_n_t_e_r_R_o_o_t, _R_e_v_e_r_t_T_o_F_o_l_l_o_w_K_e_y_-
- _b_o_a_r_d, or _R_e_v_e_r_t_T_o_N_o_n_e.
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- _t_i_m_e___r_e_t_u_r_n Returns the last_focus_time for the device.
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- _t_i_m_e Specifies the time. You can pass either a
- timestamp or _C_u_r_r_e_n_t_T_i_m_e.
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- DDEESSCCRRIIPPTTIIOONN
- The _X_S_e_t_D_e_v_i_c_e_F_o_c_u_s request changes the focus of the spec-
- ified device and its last-focus-change time. It has no
- effect if the specified time is earlier than the current
- last-focus-change time or is later than the current X
- server time. Otherwise, the last-focus-change time is set
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- X Version 11 Release 6.1 1
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- XSetDeviceFocus(3X11) X FUNCTIONS XSetDeviceFocus(3X11)
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- to the specified time _C_u_r_r_e_n_t_T_i_m_e is replaced by the cur-
- rent X server time). _X_S_e_t_D_e_v_i_c_e_F_o_c_u_s causes the X server
- to generate _D_e_v_i_c_e_F_o_c_u_s_I_n and _D_e_v_i_c_e_F_o_c_u_s_O_u_t events.
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- Depending on the focus argument, the following occurs:
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- +o If focus is _N_o_n_e , all device events are discarded
- until a new focus window is set, and the revert_to
- argument is ignored.
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- +o If focus is a window, it becomes the device's focus
- window. If a generated device event would normally
- be reported to this window or one of its inferiors,
- the event is reported as usual. Otherwise, the event
- is reported relative to the focus window.
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- +o If focus is _P_o_i_n_t_e_r_R_o_o_t, the focus window is dynami-
- cally taken to be the root window of whatever screen
- the pointer is on at each event from the specified
- device. In this case, the revert_to argument is
- ignored.
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- +o If focus is _F_o_l_l_o_w_K_e_y_b_o_a_r_d, the focus window is
- dynamically taken to be the window to which the X
- keyboard focus is set at each input event.
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- The specified focus window must be viewable at the time
- _X_S_e_t_D_e_v_i_c_e_F_o_c_u_s is called, or a _B_a_d_M_a_t_c_h error results.
- If the focus window later becomes not viewable, the X
- server evaluates the revert_to argument to determine the
- new focus window as follows:
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- +o If revert_to is _R_e_v_e_r_t_T_o_P_a_r_e_n_t, the focus reverts to
- the parent (or the closest viewable ancestor), and
- the new revert_to value is taken to be _R_e_v_e_r_t_T_o_N_o_n_e.
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- +o If revert_to is _R_e_v_e_r_t_T_o_P_o_i_n_t_e_r_R_o_o_t, _R_e_v_e_r_t_T_o_F_o_l_-
- _l_o_w_K_e_y_b_o_a_r_d, or _R_e_v_e_r_t_T_o_N_o_n_e, the focus reverts to
- _P_o_i_n_t_e_r_R_o_o_t, _F_o_l_l_o_w_K_e_y_b_o_a_r_d, or _N_o_n_e, respectively.
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- When the focus reverts, the X server generates _D_e_v_i_c_e_F_o_-
- _c_u_s_I_n and _D_e_v_i_c_e_F_o_c_u_s_O_u_t events, but the last-focus-change
- time is not affected.
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- Input extension devices are not required to support the
- ability to be focused. Attempting to set the focus of a
- device that does not support this request will result in a
- _B_a_d_M_a_t_c_h error. Whether or not given device can support
- this request can be determined by the information returned
- by _X_O_p_e_n_D_e_v_i_c_e. For those devices that support focus,
- _X_O_p_e_n_D_e_v_i_c_e will return an _X_I_n_p_u_t_C_l_a_s_s_I_n_f_o structure with
- the input_class field equal to the constant _F_o_c_u_s_C_l_a_s_s
- (defined in the file _X_I_._h).
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- X Version 11 Release 6.1 2
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- XSetDeviceFocus(3X11) X FUNCTIONS XSetDeviceFocus(3X11)
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- _X_S_e_t_D_e_v_i_c_e_F_o_c_u_s can generate _B_a_d_D_e_v_i_c_e, _B_a_d_M_a_t_c_h, _B_a_d_-
- _V_a_l_u_e, and _B_a_d_W_i_n_d_o_w errors.
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- The _X_G_e_t_D_e_v_i_c_e_F_o_c_u_s request returns the focus window and
- the current focus state.
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- Not all input extension devices can be focused. Attempt-
- ing to query the focus state of a device that can't be
- focused results in a _B_a_d_M_a_t_c_h error. A device that can be
- focused returns information for input Class Focus when an
- _X_O_p_e_n_D_e_v_i_c_e request is made.
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- _X_G_e_t_D_e_v_i_c_e_F_o_c_u_s can generate _B_a_d_D_e_v_i_c_e, and _B_a_d_M_a_t_c_h
- errors.
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- DDIIAAGGNNOOSSTTIICCSS
- _B_a_d_D_e_v_i_c_e An invalid device was specified. The speci-
- fied device does not exist or has not been
- opened by this client via _X_O_p_e_n_I_n_p_u_t_D_e_v_i_c_e.
- This error may also occur if the specified
- device is the X keyboard or X pointer device.
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- _B_a_d_V_a_l_u_e Some numeric value falls outside the range of
- values accepted by the request. Unless a spe-
- cific 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.
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- _B_a_d_W_i_n_d_o_w A value for a Window argument does not name a
- defined Window.
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- _B_a_d_M_a_t_c_h This error may occur if an _X_G_e_t_D_e_v_i_c_e_F_o_c_u_s or
- _X_S_e_t_D_e_v_i_c_e_F_o_c_u_s request was made specifying a
- device that the server implementation does not
- allow to be focused.
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- SSEEEE AALLSSOO
- _P_r_o_g_r_a_m_m_i_n_g _w_i_t_h _X_l_i_b
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- X Version 11 Release 6.1 3
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