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package ui
import (
"os"
"os/signal"
"sync/atomic"
"syscall"
"git.sr.ht/~rjarry/aerc/config"
"git.sr.ht/~rjarry/aerc/log"
"git.sr.ht/~rockorager/vaxis"
"github.com/gdamore/tcell/v2"
)
// Use unbuffered channels (always blocking unless somebody can read
// immediately) We are merely using this as a proxy to the internal vaxis event
// channel.
var Events = make(chan vaxis.Event)
var Quit = make(chan struct{})
var Callbacks = make(chan func(), 50)
// QueueFunc queues a function to be called in the main goroutine. This can be
// used to prevent race conditions from delayed functions
func QueueFunc(fn func()) {
Callbacks <- fn
}
// Use a buffered channel of size 1 to avoid blocking callers of Invalidate()
var Redraw = make(chan bool, 1)
// Invalidate marks the entire UI as invalid and request a redraw as soon as
// possible. Invalidate can be called from any goroutine and will never block.
func Invalidate() {
if atomic.SwapUint32(&state.dirty, 1) != 1 {
Redraw <- true
}
}
var state struct {
content DrawableInteractive
ctx *Context
vx *vaxis.Vaxis
popover *Popover
dirty uint32 // == 1 if render has been queued in Redraw channel
// == 1 if suspend is pending
suspending uint32
}
func Initialize(content DrawableInteractive) error {
screen, err := tcell.NewScreen()
if err != nil {
return err
}
opts := vaxis.Options{
DisableMouse: !config.Ui.MouseEnabled,
}
if err = screen.Init(opts); err != nil {
return err
}
vx := screen.Vaxis()
vx.Window().Clear()
vx.HideCursor()
width, height := vx.Window().Size()
state.content = content
state.vx = vx
state.ctx = NewContext(width, height, state.vx, onPopover)
Invalidate()
if beeper, ok := content.(DrawableInteractiveBeeper); ok {
beeper.OnBeep(screen.Beep)
}
content.Focus(true)
go func() {
defer log.PanicHandler()
for event := range vx.Events() {
Events <- tcell.TcellEvent(event)
}
}()
return nil
}
func onPopover(p *Popover) {
state.popover = p
}
func Exit() {
close(Quit)
}
var SuspendQueue = make(chan bool, 1)
func QueueSuspend() {
if atomic.SwapUint32(&state.suspending, 1) != 1 {
SuspendQueue <- true
}
}
func Suspend() error {
var err error
if atomic.SwapUint32(&state.suspending, 0) != 0 {
err = state.vx.Suspend()
if err == nil {
sigcont := make(chan os.Signal, 1)
signal.Notify(sigcont, syscall.SIGCONT)
err = syscall.Kill(0, syscall.SIGTSTP)
if err == nil {
<-sigcont
}
signal.Reset(syscall.SIGCONT)
err = state.vx.Resume()
state.content.Draw(state.ctx)
state.vx.Render()
}
}
return err
}
func Close() {
state.vx.Close()
}
func Render() {
if atomic.SwapUint32(&state.dirty, 0) != 0 {
state.vx.Window().Clear()
// reset popover for the next Draw
state.popover = nil
state.content.Draw(state.ctx)
if state.popover != nil {
// if the Draw resulted in a popover, draw it
state.popover.Draw(state.ctx)
}
state.vx.Render()
}
}
func HandleEvent(event vaxis.Event) {
if event, ok := event.(*tcell.EventResize); ok {
state.vx.Window().Clear()
width, height := event.Size()
state.ctx = NewContext(width, height, state.vx, onPopover)
Invalidate()
}
if event, ok := event.(tcell.VaxisEvent); ok {
if _, ok := event.Vaxis().(vaxis.Redraw); ok {
Invalidate()
}
}
// if we have a popover, and it can handle the event, it does so
if state.popover == nil || !state.popover.Event(event) {
// otherwise, we send the event to the main content
state.content.Event(event)
}
}
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