The _X_G_e_t_F_e_e_d_b_a_c_k_C_o_n_t_r_o_l request returns a pointer to a list of _X_F_e_e_d_b_a_c_k_S_t_a_t_e structures. Each item in this list describes one of the feedbacks supported by the device. The items are variable length, so each contains its length to allow traversal to the next item in the list.
The feedback classes that are currently defined are: _K_b_d_F_e_e_d_b_a_c_k_C_l_a_s_s, _P_t_r_F_e_e_d_b_a_c_k_C_l_a_s_s, _S_t_r_i_n_g_F_e_e_d_b_a_c_k_C_l_a_s_s, _I_n_t_e_g_e_r_F_e_e_d_b_a_c_k_C_l_a_s_s, _L_e_d_F_e_e_d_b_a_c_k_C_l_a_s_s, and _B_e_l_l_F_e_e_d_b_a_c_k_C_l_a_s_s. These constants are defined in the file _X_I_._h. An input device may support zero or more classes of feedback, and may support multiple feedbacks of the same class. Each feedback contains a class identifier and an id that is unique within that class for that input device. The id is used to identify the feedback when making an _X_C_h_a_n_g_e_F_e_e_d_b_a_c_k_C_o_n_t_r_o_l request.
_X_G_e_t_F_e_e_d_b_a_c_k_C_o_n_t_r_o_l can generate a _B_a_d_D_e_v_i_c_e or _B_a_d_M_a_t_c_h error.
The _X_C_h_a_n_g_e_F_e_e_d_b_a_c_k_C_o_n_t_r_o_l request modifies the values of one feedback on the specified device. The feedback is identified by the id field of the _X_F_e_e_d_b_a_c_k_C_o_n_t_r_o_l structure that is passed with the request. The fields of the feedback that are to be modified are identified by the bits of the mask that is passed with the request.
_X_C_h_a_n_g_e_F_e_e_d_b_a_c_k_C_o_n_t_r_o_l can generate a _B_a_d_D_e_v_i_c_e, _B_a_d_M_a_t_c_h, or _B_a_d_V_a_l_u_e error.
typedef struct {
XID class;
int length;
XID id;
} XFeedbackState, XFeedbackControl;
The _X_K_b_d_F_e_e_d_b_a_c_k_S_t_a_t_e structure defines the attributes that are returned for feedbacks equivalent to those on the X keyboard.
typedef struct {
XID class;
int length;
XID id;
int click;
int percent;
int pitch;
int duration;
int led_mask;
int global_auto_repeat;
char auto_repeats[32];
} XKbdFeedbackState;
The _X_P_t_r_F_e_e_d_b_a_c_k_S_t_a_t_e structure defines the attributes that are returned for feedbacks equivalent to those on the the X pointer.
typedef struct {
XID class;
int length;
XID id;
int accelNum;
int accelDenom;
int threshold;
} XPtrFeedbackState;
The _X_I_n_t_e_g_e_r_F_e_e_d_b_a_c_k_S_t_a_t_e structure defines attributes that are returned for integer feedbacks.
typedef struct {
XID class;
int length;
XID id;
int resolution;
int minVal;
int maxVal;
} XIntegerFeedbackState;
The _X_S_t_r_i_n_g_F_e_e_d_b_a_c_k_S_t_a_t_e structure defines the attributes that are returned for string feedbacks.
typedef struct {
XID class;
int length;
XID id;
int max_symbols;
int num_syms_supported;
KeySym *syms_supported;
} XStringFeedbackState;
The _X_B_e_l_l_F_e_e_d_b_a_c_k_S_t_a_t_e structure defines the attributes that are returned for bell feedbacks.
typedef struct {
XID class;
int length;
XID id;
int percent;
int pitch;
int duration;
} XBellFeedbackState;
The _X_L_e_d_F_e_e_d_b_a_c_k_S_t_a_t_e structure defines the attributes that are returned for LED feedbacks.
typedef struct {
XID class;
int length;
XID id;
int led_values;
} XLedFeedbackState;
The _X_P_r_t_F_e_e_d_b_a_c_k_C_o_n_t_r_o_l structure defines the attributes that can be controlled for pointer feedbacks.
typedef struct {
XID class;
int length;
XID id;
int accelNum;
int accelDenom;
int threshold;
} XPtrFeedbackControl;
The _X_K_b_d_F_e_e_d_b_a_c_k_C_o_n_t_r_o_l structure defines the attributes that can be controlled for keyboard feedbacks.
typedef struct {
XID class;
int length;
XID id;
int click;
int percent;
int pitch;
int duration;
int led_mask;
int led_value;
int key;
int auto_repeat_mode;
} XKbdFeedbackControl;
The _X_S_t_r_i_n_g_F_e_e_d_b_a_c_k_C_o_n_t_r_o_l structure defines the attributes that can be controlled for string feedbacks.
typedef struct {
XID class;
int length;
XID id;
int num_keysyms;
KeySym *syms_to_display;
} XStringFeedbackControl;
The _X_I_n_t_e_g_e_r_F_e_e_d_b_a_c_k_C_o_n_t_r_o_l structure defines the attributes that can be controlled for integer feedbacks.
typedef struct {
XID class;
int length;
XID id;
int int_to_display;
} XIntegerFeedbackControl;
The _X_B_e_l_l_F_e_e_d_b_a_c_k_C_o_n_t_r_o_l structure defines the attributes that can be controlled for bell feedbacks.
typedef struct {
XID class;
int length;
XID id;
int percent;
int pitch;
int duration;
} XBellFeedbackControl;
The _X_L_e_d_F_e_e_d_b_a_c_k_C_o_n_t_r_o_l structure defines the attributes that can be controlled for LED feedbacks.
typedef struct {
XID class;
int length;
XID id;
int led_mask;
int led_values;
} XLedFeedbackControl;