piframe-go/vendor/github.com/eiannone/keyboard/keyboard_windows.go

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2020-08-29 23:11:30 +00:00
package keyboard
import (
"syscall"
"unsafe"
"golang.org/x/sys/windows"
)
const (
vk_backspace = 0x8
vk_tab = 0x9
vk_enter = 0xd
vk_esc = 0x1b
vk_space = 0x20
vk_pgup = 0x21
vk_pgdn = 0x22
vk_end = 0x23
vk_home = 0x24
vk_arrow_left = 0x25
vk_arrow_up = 0x26
vk_arrow_right = 0x27
vk_arrow_down = 0x28
vk_insert = 0x2d
vk_delete = 0x2e
vk_f1 = 0x70
vk_f2 = 0x71
vk_f3 = 0x72
vk_f4 = 0x73
vk_f5 = 0x74
vk_f6 = 0x75
vk_f7 = 0x76
vk_f8 = 0x77
vk_f9 = 0x78
vk_f10 = 0x79
vk_f11 = 0x7a
vk_f12 = 0x7b
right_alt_pressed = 0x1
left_alt_pressed = 0x2
right_ctrl_pressed = 0x4
left_ctrl_pressed = 0x8
shift_pressed = 0x10
k32_keyEvent = 0x1
)
type (
wchar uint16
dword uint32
word uint16
k32_event struct {
key_down int32
repeat_count word
virtual_key_code word
virtual_scan_code word
unicode_char wchar
control_key_state dword
}
)
var (
kernel32 = syscall.NewLazyDLL("kernel32.dll")
k32_WaitForMultipleObjects = kernel32.NewProc("WaitForMultipleObjects")
k32_ReadConsoleInputW = kernel32.NewProc("ReadConsoleInputW")
hConsoleIn syscall.Handle
hInterrupt windows.Handle
quit = make(chan bool)
// This is just to prevent heap allocs at all costs
tmpArg dword
)
func getError(errno syscall.Errno) error {
if errno != 0 {
return error(errno)
} else {
return syscall.EINVAL
}
}
func getKeyEvent(r *k32_event) (KeyEvent, bool) {
e := KeyEvent{}
if r.key_down == 0 {
return e, false
}
ctrlPressed := r.control_key_state&(left_ctrl_pressed|right_ctrl_pressed) != 0
if r.virtual_key_code >= vk_f1 && r.virtual_key_code <= vk_f12 {
switch r.virtual_key_code {
case vk_f1:
e.Key = KeyF1
case vk_f2:
e.Key = KeyF2
case vk_f3:
e.Key = KeyF3
case vk_f4:
e.Key = KeyF4
case vk_f5:
e.Key = KeyF5
case vk_f6:
e.Key = KeyF6
case vk_f7:
e.Key = KeyF7
case vk_f8:
e.Key = KeyF8
case vk_f9:
e.Key = KeyF9
case vk_f10:
e.Key = KeyF10
case vk_f11:
e.Key = KeyF11
case vk_f12:
e.Key = KeyF12
default:
panic("unreachable")
}
return e, true
}
if r.virtual_key_code <= vk_delete {
switch r.virtual_key_code {
case vk_insert:
e.Key = KeyInsert
case vk_delete:
e.Key = KeyDelete
case vk_home:
e.Key = KeyHome
case vk_end:
e.Key = KeyEnd
case vk_pgup:
e.Key = KeyPgup
case vk_pgdn:
e.Key = KeyPgdn
case vk_arrow_up:
e.Key = KeyArrowUp
case vk_arrow_down:
e.Key = KeyArrowDown
case vk_arrow_left:
e.Key = KeyArrowLeft
case vk_arrow_right:
e.Key = KeyArrowRight
case vk_backspace:
if ctrlPressed {
e.Key = KeyBackspace2
} else {
e.Key = KeyBackspace
}
case vk_tab:
e.Key = KeyTab
case vk_enter:
e.Key = KeyEnter
case vk_esc:
e.Key = KeyEsc
case vk_space:
if ctrlPressed {
// manual return here, because KeyCtrlSpace is zero
e.Key = KeyCtrlSpace
return e, true
} else {
e.Key = KeySpace
}
}
if e.Key != 0 {
return e, true
}
}
if ctrlPressed {
if Key(r.unicode_char) >= KeyCtrlA && Key(r.unicode_char) <= KeyCtrlRsqBracket {
e.Key = Key(r.unicode_char)
return e, true
}
switch r.virtual_key_code {
case 192, 50:
// manual return here, because KeyCtrl2 is zero
e.Key = KeyCtrl2
return e, true
case 51:
e.Key = KeyCtrl3
case 52:
e.Key = KeyCtrl4
case 53:
e.Key = KeyCtrl5
case 54:
e.Key = KeyCtrl6
case 189, 191, 55:
e.Key = KeyCtrl7
case 8, 56:
e.Key = KeyCtrl8
}
if e.Key != 0 {
return e, true
}
}
if r.unicode_char != 0 {
e.Rune = rune(r.unicode_char)
return e, true
}
return e, false
}
func produceEvent(event KeyEvent) bool {
select {
case <-quit:
return false
case inputComm <- event:
return true
}
}
func inputEventsProducer() {
var input [20]uint16
for {
// Wait for events
// https://docs.microsoft.com/en-us/windows/win32/api/synchapi/nf-synchapi-waitformultipleobjects
r0, _, e1 := syscall.Syscall6(k32_WaitForMultipleObjects.Addr(), 4,
uintptr(2), uintptr(unsafe.Pointer(&hConsoleIn)), 0, windows.INFINITE, 0, 0)
if uint32(r0) == windows.WAIT_FAILED && false == produceEvent(KeyEvent{Err: getError(e1)}) {
return
}
select {
case <-quit:
return
default:
}
// Get console input
r0, _, e1 = syscall.Syscall6(k32_ReadConsoleInputW.Addr(), 4,
uintptr(hConsoleIn), uintptr(unsafe.Pointer(&input[0])), 1, uintptr(unsafe.Pointer(&tmpArg)), 0, 0)
if int(r0) == 0 {
if false == produceEvent(KeyEvent{Err: getError(e1)}) {
return
}
} else if input[0] == k32_keyEvent {
kEvent := (*k32_event)(unsafe.Pointer(&input[2]))
ev, ok := getKeyEvent(kEvent)
if ok {
for i := 0; i < int(kEvent.repeat_count); i++ {
if false == produceEvent(ev) {
return
}
}
}
}
}
}
func initConsole() (err error) {
// Create an interrupt event
hInterrupt, err = windows.CreateEvent(nil, 0, 0, nil)
if err != nil {
return err
}
hConsoleIn, err = syscall.Open("CONIN$", windows.O_RDWR, 0)
if err != nil {
windows.Close(hInterrupt)
return
}
go inputEventsProducer()
return
}
func releaseConsole() {
// Stop events producer
windows.SetEvent(hInterrupt)
quit <- true
syscall.Close(hConsoleIn)
windows.Close(hInterrupt)
}