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- XGetFeedbackControl(3X11) X FUNCTIONS XGetFeedbackControl(3X11)
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- NNAAMMEE
- XGetFeedbackControl, XChangeFeedbackControl - query and
- change input device feedbacks
-
- SSYYNNTTAAXX
- XFeedbackState * XGetFeedbackControl(_d_i_s_p_l_a_y, _d_e_v_i_c_e,
- _n_u_m___f_e_e_d_b_a_c_k_s)
- Display *_d_i_s_p_l_a_y;
- XDevice *_d_e_v_i_c_e;
- int *_n_u_m___f_e_e_d_b_a_c_k_s;
-
- int XChangeFeedbackControl(_d_i_s_p_l_a_y, _d_e_v_i_c_e, _m_a_s_k, _c_o_n_t_r_o_l)
- Display *_d_i_s_p_l_a_y;
- XDevice *_d_e_v_i_c_e;
- Mask _m_a_s_k;
- XFeedbackControl *_c_o_n_t_r_o_l;
-
- AARRGGUUMMEENNTTSS
- _d_i_s_p_l_a_y Specifies the connection to the X server.
-
- _d_e_v_i_c_e Specifies the device whose feedbacks are to
- be queried or modified.
-
- _n_u_m___f_e_e_d_b_a_c_k_s Specifies an address into which the number
- of feedbacks supported by the device is to
- be returned.
-
- _m_a_s_k Specifies a mask specific to each type of
- feedback that describes how the feedback is
- to be modified.
-
- _c_o_n_t_r_o_l Specifies the address of an _X_F_e_e_d_b_a_c_k_C_o_n_-
- _t_r_o_l structure that contains the new values
- for the feedback.
-
- DDEESSCCRRIIPPTTIIOONN
- These requests are provided to manipulate those input
- devices that support feedbacks. A _B_a_d_M_a_t_c_h error will be
- generated if the requested device does not support feed-
- backs. Whether or not a given device supports feedbacks
- can be determined by examining the information returned by
- the _X_O_p_e_n_D_e_v_i_c_e request. For those devices that support
- feedbacks, _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_e_e_d_b_a_c_k_C_l_a_s_s (defined in the file _X_I_._h).
-
- 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,
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- X Version 11 Release 6.1 1
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- XGetFeedbackControl(3X11) X FUNCTIONS XGetFeedbackControl(3X11)
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- _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 struc-
- ture 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.
-
- SSTTRRUUCCTTUURREESS
- Each class of feedback is described by a structure spe-
- cific to that class. These structures are defined in the
- file _X_I_n_p_u_t_._h. _X_F_e_e_d_b_a_c_k_S_t_a_t_e and _X_F_e_e_d_b_a_c_k_C_o_n_t_r_o_l are
- generic structures that contain three fields that are at
- the beginning of each class of feedback:
-
- 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
-
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- X Version 11 Release 6.1 2
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- XGetFeedbackControl(3X11) X FUNCTIONS XGetFeedbackControl(3X11)
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- the X pointer.
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- 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;
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- X Version 11 Release 6.1 3
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- XGetFeedbackControl(3X11) X FUNCTIONS XGetFeedbackControl(3X11)
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- int led_values;
- } XLedFeedbackState;
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- 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
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- X Version 11 Release 6.1 4
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- XGetFeedbackControl(3X11) X FUNCTIONS XGetFeedbackControl(3X11)
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- 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;
-
- 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 some other client
- has caused the specified device to become the
- X keyboard or X pointer device via the
- _X_C_h_a_n_g_e_K_e_y_b_o_a_r_d_D_e_v_i_c_e or _X_C_h_a_n_g_e_P_o_i_n_t_e_r_D_e_v_i_c_e
- requests.
-
- _B_a_d_M_a_t_c_h This error may occur if an _X_G_e_t_F_e_e_d_b_a_c_k_C_o_n_t_r_o_l
- request was made specifying a device that has
- no feedbacks, or an _X_C_h_a_n_g_e_F_e_e_d_b_a_c_k_C_o_n_t_r_o_l
- request was made with an _X_F_e_e_d_b_a_c_k_C_o_n_t_r_o_l
- structure that contains an invalid feedback
- type. It may also occur if an invalid combi-
- nation of mask bits is specified (_D_v_K_e_y but no
- _D_v_A_u_t_o_R_e_p_e_a_t_M_o_d_e for keyboard feedbacks), or
- if an invalid KeySym is specified for a string
- feedback.
-
- _B_a_d_V_a_l_u_e Some numeric value falls outside the range of
- values accepted by the _X_C_h_a_n_g_e_F_e_e_d_b_a_c_k_C_o_n_t_r_o_l
- request. Unless a specific 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.
-
- 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 5
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