/
input.go
91 lines (77 loc) · 2.38 KB
/
input.go
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package gogol
import (
"github.com/veandco/go-sdl2/sdl"
)
type KeyEventHandler []func(KeyCode)
type InputEventHandlers map[KeyCode][]func(KeyCode)
type Input struct {
KeyDownHandlers InputEventHandlers
KeyUpHandlers InputEventHandlers
MouseDownHandlers InputEventHandlers
MouseUpHandlers InputEventHandlers
KeyStates []uint8
oldKeyStates []uint8
}
func NewInput() *Input {
i := &Input{
KeyDownHandlers: make(InputEventHandlers),
KeyUpHandlers: make(InputEventHandlers),
MouseDownHandlers: make(InputEventHandlers),
MouseUpHandlers: make(InputEventHandlers),
KeyStates: sdl.GetKeyboardState(),
}
i.oldKeyStates = make([]uint8, len(i.KeyStates))
return i
}
func OnMouseDown(code KeyCode, fn func(KeyCode)) {
G.Input.MouseDownHandlers[code] = append(G.Input.MouseDownHandlers[code], fn)
}
func OnKeyDown(code KeyCode, fn func(KeyCode)) {
G.Input.KeyDownHandlers[code] = append(G.Input.KeyDownHandlers[code], fn)
}
func OnKeyUp(code KeyCode, fn func(KeyCode)) {
G.Input.KeyUpHandlers[code] = append(G.Input.KeyUpHandlers[code], fn)
}
func (i *Input) Handle() {
var event sdl.Event
copy(i.oldKeyStates, i.KeyStates)
for event = sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
switch e := event.(type) {
case *sdl.QuitEvent:
G.Quit = true
case *sdl.MouseButtonEvent:
i.handleMouseButtonEvent(e)
case *sdl.KeyDownEvent:
i.handleKeyDownEvent(e)
case *sdl.KeyUpEvent:
i.handleKeyUpEvent(e)
}
}
}
func (i *Input) handleMouseButtonEvent(e *sdl.MouseButtonEvent) {
t := e.Type
code := KeyCode(e.Button)
if t == sdl.MOUSEBUTTONDOWN {
i.MouseDownHandlers.trigger(code)
} else if t == sdl.MOUSEBUTTONUP {
i.MouseUpHandlers.trigger(code)
}
}
func (i *Input) handleKeyDownEvent(e *sdl.KeyDownEvent) {
code := sdl.GetScancodeFromKey(e.Keysym.Sym)
if i.oldKeyStates[code] == 0 {
i.KeyDownHandlers.trigger(KeyCode(code))
}
}
func (i *Input) handleKeyUpEvent(e *sdl.KeyUpEvent) {
code := sdl.GetScancodeFromKey(e.Keysym.Sym)
if i.oldKeyStates[code] == 1 {
i.KeyUpHandlers.trigger(KeyCode(code))
}
}
func (m InputEventHandlers) trigger(code KeyCode) {
h := m[code]
for _, fn := range h {
fn(code)
}
}