forked from EngoEngine/engo
/
keys.go
86 lines (69 loc) · 1.51 KB
/
keys.go
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package engi
import (
"sync"
)
var (
KEY_STATE_UP string = "up"
KEY_STATE_DOWN string = "down"
KEY_STATE_JUST_DOWN string = "justdown"
KEY_STATE_JUST_UP string = "justup"
keyStates map[Key]bool
Keys KeyManager
)
type KeyManager struct {
mapper map[Key]KeyState
mutex sync.RWMutex
}
func (km *KeyManager) Get(k Key) KeyState {
km.mutex.RLock()
defer km.mutex.RUnlock()
ks, ok := km.mapper[k]
if !ok {
return KeyState{false, false}
}
return ks
}
type KeyState struct {
lastState bool
currentState bool
}
func (key *KeyState) set(state bool) {
key.lastState = key.currentState
key.currentState = state
}
func (key *KeyState) State() string {
if !key.lastState && key.currentState {
return KEY_STATE_JUST_DOWN
} else if key.lastState && !key.currentState {
return KEY_STATE_JUST_UP
} else if key.lastState && key.currentState {
return KEY_STATE_DOWN
} else if !key.lastState && !key.currentState {
return KEY_STATE_UP
}
return KEY_STATE_UP
}
func (key KeyState) JustPressed() bool {
return key.State() == KEY_STATE_JUST_DOWN
}
func (key KeyState) JustReleased() bool {
return key.State() == KEY_STATE_JUST_UP
}
func (key KeyState) Up() bool {
return key.State() == KEY_STATE_UP
}
func (key KeyState) Down() bool {
return key.State() == KEY_STATE_DOWN
}
func keysUpdate() {
Keys.mutex.Lock()
for key, down := range keyStates {
ks := Keys.mapper[key]
ks.set(down)
Keys.mapper[key] = ks
}
Keys.mutex.Unlock()
}
func init() {
Keys.mapper = make(map[Key]KeyState)
}