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|
package termui
import (
"strconv"
tb "github.com/nsf/termbox-go"
)
var eventStream = EventStream{
make(map[string]func(Event)),
"",
make(chan bool, 1),
make(chan tb.Event),
}
type EventStream struct {
eventHandlers map[string]func(Event)
prevKey string // previous keypress
stopLoop chan bool
eventQueue chan tb.Event // list of events from termbox
}
// Event is a copy of termbox.Event that only contains the fields we need.
type Event struct {
Key string
Width int
Height int
MouseX int
MouseY int
}
// handleEvent calls the approriate callback function if there is one.
func handleEvent(e tb.Event) {
if e.Type == tb.EventError {
panic(e.Err)
}
ne := convertTermboxEvent(e)
if val, ok := eventStream.eventHandlers[ne.Key]; ok {
val(ne)
eventStream.prevKey = ""
} else { // check if the last 2 keys form a key combo with a handler
// if this is a keyboard event and the previous event was unhandled
if e.Type == tb.EventKey && eventStream.prevKey != "" {
combo := eventStream.prevKey + ne.Key
if val, ok := eventStream.eventHandlers[combo]; ok {
ne.Key = combo
val(ne)
eventStream.prevKey = ""
} else {
eventStream.prevKey = ne.Key
}
} else {
eventStream.prevKey = ne.Key
}
}
}
// Loop gets events from termbox and passes them off to handleEvent.
// Stops when StopLoop is called.
func Loop() {
go func() {
for {
eventStream.eventQueue <- tb.PollEvent()
}
}()
for {
select {
case <-eventStream.stopLoop:
return
case e := <-eventStream.eventQueue:
handleEvent(e)
}
}
}
// StopLoop stops the event loop.
func StopLoop() {
eventStream.stopLoop <- true
}
// On assigns event names to their handlers. Takes a string, strings, or a slice of strings, and a function.
func On(things ...interface{}) {
function := things[len(things)-1].(func(Event))
for _, thing := range things {
if value, ok := thing.(string); ok {
eventStream.eventHandlers[value] = function
}
if value, ok := thing.([]string); ok {
for _, name := range value {
eventStream.eventHandlers[name] = function
}
}
}
}
// convertTermboxKeyValue converts a termbox keyboard event to a more friendly string format.
// Combines modifiers into the string instead of having them as additional fields in an event.
func convertTermboxKeyValue(e tb.Event) string {
k := string(e.Ch)
pre := ""
mod := ""
if e.Mod == tb.ModAlt {
mod = "M-"
}
if e.Ch == 0 {
if e.Key > 0xFFFF-12 {
k = "<f" + strconv.Itoa(0xFFFF-int(e.Key)+1) + ">"
} else if e.Key > 0xFFFF-25 {
ks := []string{"<insert>", "<delete>", "<home>", "<end>", "<previous>", "<next>", "<up>", "<down>", "<left>", "<right>"}
k = ks[0xFFFF-int(e.Key)-12]
}
if e.Key <= 0x7F {
pre = "C-"
k = string('a' - 1 + int(e.Key))
kmap := map[tb.Key][2]string{
tb.KeyCtrlSpace: {"C-", "<space>"},
tb.KeyBackspace: {"", "<backspace>"},
tb.KeyTab: {"", "<tab>"},
tb.KeyEnter: {"", "<enter>"},
tb.KeyEsc: {"", "<escape>"},
tb.KeyCtrlBackslash: {"C-", "\\"},
tb.KeyCtrlSlash: {"C-", "/"},
tb.KeySpace: {"", "<space>"},
tb.KeyCtrl8: {"C-", "8"},
}
if sk, ok := kmap[e.Key]; ok {
pre = sk[0]
k = sk[1]
}
}
}
return pre + mod + k
}
func convertTermboxMouseValue(e tb.Event) string {
switch e.Key {
case tb.MouseLeft:
return "MouseLeft"
case tb.MouseMiddle:
return "MouseMiddle"
case tb.MouseRight:
return "MouseRight"
case tb.MouseWheelUp:
return "MouseWheelUp"
case tb.MouseWheelDown:
return "MouseWheelDown"
case tb.MouseRelease:
return "MouseRelease"
}
return ""
}
// convertTermboxEvent turns a termbox event into a termui event.
func convertTermboxEvent(e tb.Event) Event {
var ne Event
switch e.Type {
case tb.EventKey:
ne = Event{
Key: convertTermboxKeyValue(e),
}
case tb.EventMouse:
ne = Event{
Key: convertTermboxMouseValue(e),
MouseX: e.MouseX,
MouseY: e.MouseY,
}
case tb.EventResize:
ne = Event{
Key: "resize",
Width: e.Width,
Height: e.Height,
}
}
return ne
}
|
