ui/kbd-state.c

   1 /*
   2  * This work is licensed under the terms of the GNU GPL, version 2 or
   3  * (at your option) any later version.  See the COPYING file in the
   4  * top-level directory.
   5  */
   6 #include "qemu/osdep.h"
   7 #include "qemu/bitmap.h"
   8 #include "qemu/queue.h"
   9 #include "ui/console.h"
  10 #include "ui/input.h"
  11 #include "ui/kbd-state.h"
  12
  13 struct QKbdState {
  14     QemuConsole *con;
  15     int key_delay_ms;
  16     DECLARE_BITMAP(keys, Q_KEY_CODE__MAX);
  17     DECLARE_BITMAP(mods, QKBD_MOD__MAX);
  18 };
  19
  20 static void qkbd_state_modifier_update(QKbdState *kbd,
  21                                       QKeyCode qcode1, QKeyCode qcode2,
  22                                       QKbdModifier mod)
  23 {
  24     if (test_bit(qcode1, kbd->keys) || test_bit(qcode2, kbd->keys)) {
  25         set_bit(mod, kbd->mods);
  26     } else {
  27         clear_bit(mod, kbd->mods);
  28     }
  29 }
  30
  31 bool qkbd_state_modifier_get(QKbdState *kbd, QKbdModifier mod)
  32 {
  33     return test_bit(mod, kbd->mods);
  34 }
  35
  36 bool qkbd_state_key_get(QKbdState *kbd, QKeyCode qcode)
  37 {
  38     return test_bit(qcode, kbd->keys);
  39 }
  40
  41 void qkbd_state_key_event(QKbdState *kbd, QKeyCode qcode, bool down)
  42 {
  43     bool state = test_bit(qcode, kbd->keys);
  44
  45     if (state == down) {
  46         /*
  47          * Filter out events which don't change the keyboard state.
  48          *
  49          * Most notably this allows to simply send along all key-up
  50          * events, and this function will filter out everything where
  51          * the corresponding key-down event wasn't send to the guest,
  52          * for example due to being a host hotkey.
  53          */
  54         return;
  55     }
  56
  57     /* update key and modifier state */
  58     change_bit(qcode, kbd->keys);
  59     switch (qcode) {
  60     case Q_KEY_CODE_SHIFT:
  61     case Q_KEY_CODE_SHIFT_R:
  62         qkbd_state_modifier_update(kbd, Q_KEY_CODE_SHIFT, Q_KEY_CODE_SHIFT_R,
  63                                    QKBD_MOD_SHIFT);
  64         break;
  65     case Q_KEY_CODE_CTRL:
  66     case Q_KEY_CODE_CTRL_R:
  67         qkbd_state_modifier_update(kbd, Q_KEY_CODE_CTRL, Q_KEY_CODE_CTRL_R,
  68                                    QKBD_MOD_CTRL);
  69         break;
  70     case Q_KEY_CODE_ALT:
  71         qkbd_state_modifier_update(kbd, Q_KEY_CODE_ALT, Q_KEY_CODE_ALT,
  72                                    QKBD_MOD_ALT);
  73         break;
  74     case Q_KEY_CODE_ALT_R:
  75         qkbd_state_modifier_update(kbd, Q_KEY_CODE_ALT_R, Q_KEY_CODE_ALT_R,
  76                                    QKBD_MOD_ALTGR);
  77         break;
  78     case Q_KEY_CODE_CAPS_LOCK:
  79         if (down) {
  80             change_bit(QKBD_MOD_CAPSLOCK, kbd->mods);
  81         }
  82         break;
  83     case Q_KEY_CODE_NUM_LOCK:
  84         if (down) {
  85             change_bit(QKBD_MOD_NUMLOCK, kbd->mods);
  86         }
  87         break;
  88     default:
  89         /* keep gcc happy */
  90         break;
  91     }
  92
  93     /* send to guest */
  94     if (qemu_console_is_graphic(kbd->con)) {
  95         qemu_input_event_send_key_qcode(kbd->con, qcode, down);
  96         if (kbd->key_delay_ms) {
  97             qemu_input_event_send_key_delay(kbd->key_delay_ms);
  98         }
  99     }
 100 }
 101
 102 void qkbd_state_lift_all_keys(QKbdState *kbd)
 103 {
 104     int qcode;
 105
 106     for (qcode = 0; qcode < Q_KEY_CODE__MAX; qcode++) {
 107         if (test_bit(qcode, kbd->keys)) {
 108             qkbd_state_key_event(kbd, qcode, false);
 109         }
 110     }
 111 }
 112
 113 void qkbd_state_set_delay(QKbdState *kbd, int delay_ms)
 114 {
 115     kbd->key_delay_ms = delay_ms;
 116 }
 117
 118 void qkbd_state_free(QKbdState *kbd)
 119 {
 120     g_free(kbd);
 121 }
 122
 123 QKbdState *qkbd_state_init(QemuConsole *con)
 124 {
 125     QKbdState *kbd = g_new0(QKbdState, 1);
 126
 127     kbd->con = con;
 128
 129     return kbd;
 130 }