termui/events.go

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// Copyright 2015 Zack Guo <gizak@icloud.com>. All rights reserved.
// Use of this source code is governed by a MIT license that can
// be found in the LICENSE file.
//
// Portions of this file uses [termbox-go](https://github.com/nsf/termbox-go/blob/54b74d087b7c397c402d0e3b66d2ccb6eaf5c2b4/api_common.go)
// by [authors](https://github.com/nsf/termbox-go/blob/master/AUTHORS)
// under [license](https://github.com/nsf/termbox-go/blob/master/LICENSE)
package termui
import "github.com/nsf/termbox-go"
/***********************************termbox-go**************************************/
type (
EventType uint8
Modifier uint8
Key uint16
)
// This type represents a termbox event. The 'Mod', 'Key' and 'Ch' fields are
// valid if 'Type' is EventKey. The 'Width' and 'Height' fields are valid if
// 'Type' is EventResize. The 'Err' field is valid if 'Type' is EventError.
type Event struct {
Type EventType // one of Event* constants
Mod Modifier // one of Mod* constants or 0
Key Key // one of Key* constants, invalid if 'Ch' is not 0
Ch rune // a unicode character
Width int // width of the screen
Height int // height of the screen
Err error // error in case if input failed
MouseX int // x coord of mouse
MouseY int // y coord of mouse
N int // number of bytes written when getting a raw event
}
const (
KeyF1 Key = 0xFFFF - iota
KeyF2
KeyF3
KeyF4
KeyF5
KeyF6
KeyF7
KeyF8
KeyF9
KeyF10
KeyF11
KeyF12
KeyInsert
KeyDelete
KeyHome
KeyEnd
KeyPgup
KeyPgdn
KeyArrowUp
KeyArrowDown
KeyArrowLeft
KeyArrowRight
key_min // see terminfo
MouseLeft
MouseMiddle
MouseRight
)
const (
KeyCtrlTilde Key = 0x00
KeyCtrl2 Key = 0x00
KeyCtrlSpace Key = 0x00
KeyCtrlA Key = 0x01
KeyCtrlB Key = 0x02
KeyCtrlC Key = 0x03
KeyCtrlD Key = 0x04
KeyCtrlE Key = 0x05
KeyCtrlF Key = 0x06
KeyCtrlG Key = 0x07
KeyBackspace Key = 0x08
KeyCtrlH Key = 0x08
KeyTab Key = 0x09
KeyCtrlI Key = 0x09
KeyCtrlJ Key = 0x0A
KeyCtrlK Key = 0x0B
KeyCtrlL Key = 0x0C
KeyEnter Key = 0x0D
KeyCtrlM Key = 0x0D
KeyCtrlN Key = 0x0E
KeyCtrlO Key = 0x0F
KeyCtrlP Key = 0x10
KeyCtrlQ Key = 0x11
KeyCtrlR Key = 0x12
KeyCtrlS Key = 0x13
KeyCtrlT Key = 0x14
KeyCtrlU Key = 0x15
KeyCtrlV Key = 0x16
KeyCtrlW Key = 0x17
KeyCtrlX Key = 0x18
KeyCtrlY Key = 0x19
KeyCtrlZ Key = 0x1A
KeyEsc Key = 0x1B
KeyCtrlLsqBracket Key = 0x1B
KeyCtrl3 Key = 0x1B
KeyCtrl4 Key = 0x1C
KeyCtrlBackslash Key = 0x1C
KeyCtrl5 Key = 0x1D
KeyCtrlRsqBracket Key = 0x1D
KeyCtrl6 Key = 0x1E
KeyCtrl7 Key = 0x1F
KeyCtrlSlash Key = 0x1F
KeyCtrlUnderscore Key = 0x1F
KeySpace Key = 0x20
KeyBackspace2 Key = 0x7F
KeyCtrl8 Key = 0x7F
)
// Alt modifier constant, see Event.Mod field and SetInputMode function.
const (
ModAlt Modifier = 0x01
)
// Event type. See Event.Type field.
const (
EventKey EventType = iota
EventResize
EventMouse
EventError
EventInterrupt
EventRaw
EventNone
)
/**************************************end**************************************/
// convert termbox.Event to termui.Event
func uiEvt(e termbox.Event) Event {
event := Event{}
event.Type = EventType(e.Type)
event.Mod = Modifier(e.Mod)
event.Key = Key(e.Key)
event.Ch = e.Ch
event.Width = e.Width
event.Height = e.Height
event.Err = e.Err
event.MouseX = e.MouseX
event.MouseY = e.MouseY
event.N = e.N
return event
}
var evtChs = make([]chan Event, 0)
// EventCh returns an output-only event channel.
// This function can be called many times (multiplexer).
func EventCh() <-chan Event {
out := make(chan Event)
evtChs = append(evtChs, out)
return out
}
// turn on event listener
func evtListen() {
go func() {
for {
e := termbox.PollEvent()
// dispatch
for _, c := range evtChs {
go func(ch chan Event) {
ch <- uiEvt(e)
}(c)
}
}
}()
}
/*
// EventHandlers is a handler sequence
var EventHandlers []func(Event)
var signalQuit = make(chan bool)
// Quit sends quit signal to terminate termui
func Quit() {
signalQuit <- true
}
// Wait listening to signalQuit, block operation.
func Wait() {
<-signalQuit
}
// RegEvtHandler register function into TSEventHandler sequence.
func RegEvtHandler(fn func(Event)) {
EventHandlers = append(EventHandlers, fn)
}
// EventLoop handles all events and
// redirects every event to callbacks in EventHandlers
func EventLoop() {
evt := make(chan termbox.Event)
go func() {
for {
evt <- termbox.PollEvent()
}
}()
for {
select {
case c := <-signalQuit:
defer func() { signalQuit <- c }()
return
case e := <-evt:
for _, fn := range EventHandlers {
fn(uiEvt(e))
}
}
}
}
*/