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 "ui/console.h"
   9 #include "ui/input.h"
  10 #include "ui/kbd-state.h"
  11
  12 struct QKbdState {
  13     QemuConsole *con;
  14     int key_delay_ms;
  15     DECLARE_BITMAP(keys, Q_KEY_CODE__MAX);
  16     DECLARE_BITMAP(mods, QKBD_MOD__MAX);
  17 };
  18
  19 static void qkbd_state_modifier_update(QKbdState *kbd,
  20                                       QKeyCode qcode1, QKeyCode qcode2,
  21                                       QKbdModifier mod)
  22 {
  23     if (test_bit(qcode1, kbd->keys) || test_bit(qcode2, kbd->keys)) {
  24         set_bit(mod, kbd->mods);
  25     } else {
  26         clear_bit(mod, kbd->mods);
  27     }
  28 }
  29
  30 bool qkbd_state_modifier_get(QKbdState *kbd, QKbdModifier mod)
  31 {
  32     return test_bit(mod, kbd->mods);
  33 }
  34
  35 bool qkbd_state_key_get(QKbdState *kbd, QKeyCode qcode)
  36 {
  37     return test_bit(qcode, kbd->keys);
  38 }
  39
  40 void qkbd_state_key_event(QKbdState *kbd, QKeyCode qcode, bool down)
  41 {
  42     bool state = test_bit(qcode, kbd->keys);
  43
  44     if (down == false  /* got key-up event   */ &&
  45         state == false /* key is not pressed */) {
  46         /*
  47          * Filter out suspicious key-up events.
  48          *
  49          * This allows simply sending along all key-up events, and
  50          * this function will filter out everything where the
  51          * corresponding key-down event wasn't sent to the guest, for
  52          * example due to being a host hotkey.
  53          *
  54          * Note that key-down events on already pressed keys are *not*
  55          * suspicious, those are keyboard autorepeat events.
  56          */
  57         return;
  58     }
  59
  60     /* update key and modifier state */
  61     if (down) {
  62         set_bit(qcode, kbd->keys);
  63     } else {
  64         clear_bit(qcode, kbd->keys);
  65     }
  66     switch (qcode) {
  67     case Q_KEY_CODE_SHIFT:
  68     case Q_KEY_CODE_SHIFT_R:
  69         qkbd_state_modifier_update(kbd, Q_KEY_CODE_SHIFT, Q_KEY_CODE_SHIFT_R,
  70                                    QKBD_MOD_SHIFT);
  71         break;
  72     case Q_KEY_CODE_CTRL:
  73     case Q_KEY_CODE_CTRL_R:
  74         qkbd_state_modifier_update(kbd, Q_KEY_CODE_CTRL, Q_KEY_CODE_CTRL_R,
  75                                    QKBD_MOD_CTRL);
  76         break;
  77     case Q_KEY_CODE_ALT:
  78         qkbd_state_modifier_update(kbd, Q_KEY_CODE_ALT, Q_KEY_CODE_ALT,
  79                                    QKBD_MOD_ALT);
  80         break;
  81     case Q_KEY_CODE_ALT_R:
  82         qkbd_state_modifier_update(kbd, Q_KEY_CODE_ALT_R, Q_KEY_CODE_ALT_R,
  83                                    QKBD_MOD_ALTGR);
  84         break;
  85     case Q_KEY_CODE_CAPS_LOCK:
  86         if (down) {
  87             change_bit(QKBD_MOD_CAPSLOCK, kbd->mods);
  88         }
  89         break;
  90     case Q_KEY_CODE_NUM_LOCK:
  91         if (down) {
  92             change_bit(QKBD_MOD_NUMLOCK, kbd->mods);
  93         }
  94         break;
  95     default:
  96         /* keep gcc happy */
  97         break;
  98     }
  99
 100     /* send to guest */
 101     if (qemu_console_is_graphic(kbd->con)) {
 102         qemu_input_event_send_key_qcode(kbd->con, qcode, down);
 103         if (kbd->key_delay_ms) {
 104             qemu_input_event_send_key_delay(kbd->key_delay_ms);
 105         }
 106     }
 107 }
 108
 109 void qkbd_state_lift_all_keys(QKbdState *kbd)
 110 {
 111     int qcode;
 112
 113     for (qcode = 0; qcode < Q_KEY_CODE__MAX; qcode++) {
 114         if (test_bit(qcode, kbd->keys)) {
 115             qkbd_state_key_event(kbd, qcode, false);
 116         }
 117     }
 118 }
 119
 120 void qkbd_state_set_delay(QKbdState *kbd, int delay_ms)
 121 {
 122     kbd->key_delay_ms = delay_ms;
 123 }
 124
 125 void qkbd_state_free(QKbdState *kbd)
 126 {
 127     g_free(kbd);
 128 }
 129
 130 QKbdState *qkbd_state_init(QemuConsole *con)
 131 {
 132     QKbdState *kbd = g_new0(QKbdState, 1);
 133
 134     kbd->con = con;
 135
 136     return kbd;
 137 }