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<HTML><HEAD><TITLE>Xlib Programming Manual: Keyboard and Pointer Settings</TITLE></HEAD><BODY><H1 ALIGN=center>12.6 Keyboard and Pointer Settings</H1>Xlib provides functions that you can use tochange the keyboard control, obtain a list of the auto-repeat keys,turn keyboard auto-repeat on or off, ring the bell, set or obtain the pointer button or keyboard mapping, and obtain a bit vector for the keyboard.<P><!.IN "Keyboard" "bell volume"><!.IN "Keyboard" "keyclick volume"><!.IN "Keyboard" "bit vector"><!.IN "Mouse" "programming">This section discusses the user-preference options of bell, key click,pointer behavior, and so on.The default values for many of these options are server dependent.Not all implementations will actually be able to control all of theseparameters.<P>The<B><A HREF="XChangeKeyboardControl.html">XChangeKeyboardControl()</A></B>function changes control of a keyboard and operates on a<B>XKeyboardControl</B>structure:<A NAME="XKeyboardControl"></A><P><PRE><CODE>/* Mask bits for ChangeKeyboardControl */#define <B>KBKeyClickPercent</B> (1L<<0)#define <B>KBBellPercent</B> (1L<<1)#define <B>KBBellPitch</B> (1L<<2)#define <B>KBBellDuration</B> (1L<<3)#define <B>KBLed</B> (1L<<4)#define <B>KBLedMode</B> (1L<<5)#define <B>KBKey</B> (1L<<6)#define <B>KBAutoRepeatMode</B> (1L<<7)</PRE></CODE><!.IN "XKeyboardControl" "" "@DEF@"><PRE><CODE>/* Values */typedef struct { int key_click_percent; int bell_percent; int bell_pitch; int bell_duration; int led; int led_mode; /* LedModeOn, LedModeOff */ int key; int auto_repeat_mode; /* AutoRepeatModeOff, AutoRepeatModeOn, AutoRepeatModeDefault */} XKeyboardControl;</PRE></CODE><P>The <B>key_click_percent</B> member sets the volume for key clicks between 0 (off) and 100 (loud) inclusive, if possible. A setting of -1 restores the default.Other negative values generate a<B>BadValue</B>error.<P>The <B>bell_percent</B> sets the base volume for the bell between 0 (off) and 100(loud) inclusive, if possible. A setting of -1 restores the default.Other negative values generate a<B>BadValue</B>error.The <B>bell_pitch</B> member sets the pitch (specified in Hz) of the bell, if possible.A setting of -1 restores the default.Other negative values generate a<B>BadValue</B>error.The <B>bell_duration</B> member sets the duration of thebell specified in milliseconds, if possible. A setting of -1 restores the default.Other negative values generate a<B>BadValue</B>error.<P>If both the <B>led_mode</B> and <B>led</B> members are specified,the state of that LED is changed, if possible. The <B>led_mode</B> member can be set to<B>LedModeOn</B>or<B>LedModeOff</B>.If only led_mode is specified, the state ofall LEDs are changed, if possible. At most 32 LEDs numbered from one are supported. No standard interpretation of LEDs is defined.If <B>led</B> is specified without <B>led_mode</B>, a<B>BadMatch</B>error results. <P>If both the auto_repeat_mode and key members are specified, the auto_repeat_mode of that key is changed (according to<B>AutoRepeatModeOn</B>,<B>AutoRepeatModeOff</B>,or<B>AutoRepeatModeDefault</B>),if possible.If only auto_repeat_mode isspecified, the global auto_repeat_mode for the entire keyboard ischanged, if possible, and does not affect the per key settings.If a key is specified without an auto_repeat_mode, a<B>BadMatch</B>error results.Each key has an individual mode of whether or not it should auto-repeatand a default setting for the mode.In addition,there is a global mode of whether auto-repeat should be enabled or notand a default setting for that mode.When global mode is<B>AutoRepeatModeOn</B>,keys should obey their individual auto-repeat modes.When global mode is<B>AutoRepeatModeOff</B>,no keys should auto-repeat.An auto-repeating key generates alternating<B><A HREF="../events/keyboard-pointer/keyboard-pointer.html">KeyPress</A></B>and<B><A HREF="../events/keyboard-pointer/keyboard-pointer.html">KeyRelease</A></B>events.When a key is used as a modifier,it is desirable for the key not to auto-repeat,regardless of its auto-repeat setting.<P>A bell generator connected with the console but not directly on akeyboard is treated as if it were part of the keyboard.The order in which controls are verified and altered is server-dependent.If an error is generated, a subset of the controls may have been altered.<P>To obtain the current control values for the keyboard, use<B><A HREF="XGetKeyboardControl.html">XGetKeyboardControl()</A></B>.<P>To turn on keyboard auto-repeat, use<B><A HREF="XAutoRepeatOn.html">XAutoRepeatOn()</A></B>.<P>To turn off keyboard auto-repeat, use<B><A HREF="XAutoRepeatOff.html">XAutoRepeatOff()</A></B>.<P>To ring the bell, use<B><A HREF="XBell.html">XBell()</A></B>.<P>To obtain a bit vector that describes the state of the keyboard, use<B><A HREF="XQueryKeymap.html">XQueryKeymap()</A></B>.<P>To set the mapping of the pointer buttons, use<B><A HREF="XSetPointerMapping.html">XSetPointerMapping()</A></B>.<P>To get the pointer mapping, use<B><A HREF="XGetPointerMapping.html">XGetPointerMapping()</A></B>.<P>To control the pointer's interactive feel, use<B><A HREF="XChangePointerControl.html">XChangePointerControl()</A></B>.<P>To get the current pointer parameters, use<B><A HREF="XGetPointerControl.html">XGetPointerControl()</A></B>.<H5 ALIGN=right><I>Next: <A HREF="keyboard-encoding.html">Keyboard Encoding</A></I></H5><HR><ADDRESS><A HREF="http://tronche.com/">Christophe Tronche</A>, <A HREF="mailto:ch.tronche@computer.org">ch.tronche@computer.org</A></ADDRESS></BODY></HTML>⌨️ 快捷键说明
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