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- XGrabPointer(3X11) XLIB FUNCTIONS XGrabPointer(3X11)
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- NNAAMMEE
- XGrabPointer, XUngrabPointer, XChangeActivePointerGrab -
- grab the pointer
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- SSYYNNTTAAXX
- int XGrabPointer(_d_i_s_p_l_a_y, _g_r_a_b___w_i_n_d_o_w, _o_w_n_e_r___e_v_e_n_t_s,
- _e_v_e_n_t___m_a_s_k, _p_o_i_n_t_e_r___m_o_d_e,
- _k_e_y_b_o_a_r_d___m_o_d_e, _c_o_n_f_i_n_e___t_o, _c_u_r_s_o_r, _t_i_m_e)
- Display *_d_i_s_p_l_a_y;
- Window _g_r_a_b___w_i_n_d_o_w;
- Bool _o_w_n_e_r___e_v_e_n_t_s;
- unsigned int _e_v_e_n_t___m_a_s_k;
- int _p_o_i_n_t_e_r___m_o_d_e, _k_e_y_b_o_a_r_d___m_o_d_e;
- Window _c_o_n_f_i_n_e___t_o;
- Cursor _c_u_r_s_o_r;
- Time _t_i_m_e;
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- XUngrabPointer(_d_i_s_p_l_a_y, _t_i_m_e)
- Display *_d_i_s_p_l_a_y;
- Time _t_i_m_e;
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- XChangeActivePointerGrab(_d_i_s_p_l_a_y, _e_v_e_n_t___m_a_s_k, _c_u_r_s_o_r,
- _t_i_m_e)
- Display *_d_i_s_p_l_a_y;
- unsigned int _e_v_e_n_t___m_a_s_k;
- Cursor _c_u_r_s_o_r;
- Time _t_i_m_e;
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- AARRGGUUMMEENNTTSS
- _c_o_n_f_i_n_e___t_o
- Specifies the window to confine the pointer in
- or _N_o_n_e.
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- _c_u_r_s_o_r Specifies the cursor that is to be displayed
- during the grab or _N_o_n_e.
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- _d_i_s_p_l_a_y Specifies the connection to the X server.
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- _e_v_e_n_t___m_a_s_k
- Specifies which pointer events are reported to
- the client. The mask is the bitwise inclusive
- OR of the valid pointer event mask bits.
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- _g_r_a_b___w_i_n_d_o_w
- Specifies the grab window.
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- _k_e_y_b_o_a_r_d___m_o_d_e
- Specifies further processing of keyboard events.
- You can pass _G_r_a_b_M_o_d_e_S_y_n_c or _G_r_a_b_M_o_d_e_A_s_y_n_c.
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- _o_w_n_e_r___e_v_e_n_t_s
- Specifies a Boolean value that indicates whether
- the pointer events are to be reported as usual
- or reported with respect to the grab window if
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- X Version 11 Release 6.1 1
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- XGrabPointer(3X11) XLIB FUNCTIONS XGrabPointer(3X11)
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- selected by the event mask.
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- _p_o_i_n_t_e_r___m_o_d_e
- Specifies further processing of pointer events.
- You can pass _G_r_a_b_M_o_d_e_S_y_n_c or _G_r_a_b_M_o_d_e_A_s_y_n_c.
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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_G_r_a_b_P_o_i_n_t_e_r function actively grabs control of the
- pointer and returns _G_r_a_b_S_u_c_c_e_s_s if the grab was success-
- ful. Further pointer events are reported only to the
- grabbing client. _X_G_r_a_b_P_o_i_n_t_e_r overrides any active
- pointer grab by this client. If owner_events is _F_a_l_s_e,
- all generated pointer events are reported with respect to
- grab_window and are reported only if selected by
- event_mask. If owner_events is _T_r_u_e and if a generated
- pointer event would normally be reported to this client,
- it is reported as usual. Otherwise, the event is reported
- with respect to the grab_window and is reported only if
- selected by event_mask. For either value of owner_events,
- unreported events are discarded.
-
- If the pointer_mode is _G_r_a_b_M_o_d_e_A_s_y_n_c, pointer event pro-
- cessing continues as usual. If the pointer is currently
- frozen by this client, the processing of events for the
- pointer is resumed. If the pointer_mode is _G_r_a_b_M_o_d_e_S_y_n_c,
- the state of the pointer, as seen by client applications,
- appears to freeze, and the X server generates no further
- pointer events until the grabbing client calls _X_A_l_l_o_w_-
- _E_v_e_n_t_s or until the pointer grab is released. Actual
- pointer changes are not lost while the pointer is frozen;
- they are simply queued in the server for later processing.
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- If the keyboard_mode is _G_r_a_b_M_o_d_e_A_s_y_n_c, keyboard event pro-
- cessing is unaffected by activation of the grab. If the
- keyboard_mode is _G_r_a_b_M_o_d_e_S_y_n_c, the state of the keyboard,
- as seen by client applications, appears to freeze, and the
- X server generates no further keyboard events until the
- grabbing client calls _X_A_l_l_o_w_E_v_e_n_t_s or until the pointer
- grab is released. Actual keyboard changes are not lost
- while the pointer is frozen; they are simply queued in the
- server for later processing.
-
- If a cursor is specified, it is displayed regardless of
- what window the pointer is in. If _N_o_n_e is specified, the
- normal cursor for that window is displayed when the
- pointer is in grab_window or one of its subwindows; other-
- wise, the cursor for grab_window is displayed.
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- If a confine_to window is specified, the pointer is
- restricted to stay contained in that window. The con-
- fine_to window need have no relationship to the
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- X Version 11 Release 6.1 2
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- XGrabPointer(3X11) XLIB FUNCTIONS XGrabPointer(3X11)
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- grab_window. If the pointer is not initially in the con-
- fine_to window, it is warped automatically to the closest
- edge just before the grab activates and enter/leave events
- are generated as usual. If the confine_to window is sub-
- sequently reconfigured, the pointer is warped automati-
- cally, as necessary, to keep it contained in the window.
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- The time argument allows you to avoid certain circum-
- stances that come up if applications take a long time to
- respond or if there are long network delays. Consider a
- situation where you have two applications, both of which
- normally grab the pointer when clicked on. If both appli-
- cations specify the timestamp from the event, the second
- application may wake up faster and successfully grab the
- pointer before the first application. The first applica-
- tion then will get an indication that the other applica-
- tion grabbed the pointer before its request was processed.
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- _X_G_r_a_b_P_o_i_n_t_e_r generates _E_n_t_e_r_N_o_t_i_f_y and _L_e_a_v_e_N_o_t_i_f_y events.
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- Either if grab_window or confine_to window is not viewable
- or if the confine_to window lies completely outside the
- boundaries of the root window, _X_G_r_a_b_P_o_i_n_t_e_r fails and
- returns _G_r_a_b_N_o_t_V_i_e_w_a_b_l_e. If the pointer is actively
- grabbed by some other client, it fails and returns
- _A_l_r_e_a_d_y_G_r_a_b_b_e_d. If the pointer is frozen by an active
- grab of another client, it fails and returns _G_r_a_b_F_r_o_z_e_n.
- If the specified time is earlier than the last-pointer-
- grab time or later than the current X server time, it
- fails and returns _G_r_a_b_I_n_v_a_l_i_d_T_i_m_e. Otherwise, the last-
- pointer-grab time is set to the specified time (_C_u_r_r_e_n_t_-
- _T_i_m_e is replaced by the current X server time).
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- _X_G_r_a_b_P_o_i_n_t_e_r can generate _B_a_d_C_u_r_s_o_r, _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_U_n_g_r_a_b_P_o_i_n_t_e_r function releases the pointer and any
- queued events if this client has actively grabbed the
- pointer from _X_G_r_a_b_P_o_i_n_t_e_r, _X_G_r_a_b_B_u_t_t_o_n, or from a normal
- button press. _X_U_n_g_r_a_b_P_o_i_n_t_e_r does not release the pointer
- if the specified time is earlier than the last-pointer-
- grab time or is later than the current X server time. It
- also generates _E_n_t_e_r_N_o_t_i_f_y and _L_e_a_v_e_N_o_t_i_f_y events. The X
- server performs an _U_n_g_r_a_b_P_o_i_n_t_e_r request automatically if
- the event window or confine_to window for an active
- pointer grab becomes not viewable or if window reconfigu-
- ration causes the confine_to window to lie completely out-
- side the boundaries of the root window.
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- The _X_C_h_a_n_g_e_A_c_t_i_v_e_P_o_i_n_t_e_r_G_r_a_b function changes the speci-
- fied dynamic parameters if the pointer is actively grabbed
- by the client and if the specified time is no earlier than
- the last-pointer-grab time and no later than the current X
- server time. This function has no effect on the passive
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- X Version 11 Release 6.1 3
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- XGrabPointer(3X11) XLIB FUNCTIONS XGrabPointer(3X11)
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- parameters of a _X_G_r_a_b_B_u_t_t_o_n. The interpretation of
- event_mask and cursor is the same as described in
- _X_G_r_a_b_P_o_i_n_t_e_r.
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- _X_C_h_a_n_g_e_A_c_t_i_v_e_P_o_i_n_t_e_r_G_r_a_b can generate a _B_a_d_C_u_r_s_o_r and _B_a_d_-
- _V_a_l_u_e error.
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- DDIIAAGGNNOOSSTTIICCSS
- _B_a_d_C_u_r_s_o_r A value for a Cursor argument does not name a
- defined Cursor.
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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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- SSEEEE AALLSSOO
- XAllowEvents(3X11), XGrabButton(3X11), XGrabKey(3X11),
- XGrabKeyboard(3X11)
- _X_l_i_b _- _C _L_a_n_g_u_a_g_e _X _I_n_t_e_r_f_a_c_e
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- X Version 11 Release 6.1 4
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