/
tuikit.go
240 lines (197 loc) · 4.29 KB
/
tuikit.go
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package tuikit
import (
"fmt"
"sync"
"time"
termbox "github.com/nsf/termbox-go"
"github.com/nsf/tulib"
log "github.com/sgeb/go-sglog"
)
type Painter interface {
PaintTo(buffer *tulib.Buffer, rect Rect) error
DesiredMinSize() Size
SetPaintSubscriber(cb func())
SetResizeSubscriber(cb func())
}
type Responder interface {
// HandleEvent should set Event.Handled to true if it was
// handled so that the main loop knows to ignores it
HandleEvent(*Event)
SetCursorPainter(cb func(Point))
}
type Event struct {
*termbox.Event
Handled bool
}
const (
MaxFps = 40
frameInterval = time.Second / MaxFps
)
var (
rootPainter Painter
rootBuffer tulib.Buffer
firstResponder Responder
// Event polling channel
Events chan Event = make(chan Event, 20)
// Paint channel. Clients write to it to request repaint
paintChan chan struct{} = make(chan struct{}, 1)
// Controls event polling
internalEvents chan termbox.Event = make(chan termbox.Event, 20)
stopPolling chan struct{} = make(chan struct{}, 1)
// Lock on screen drawing
mutex sync.Mutex
fpsCounter *FpsCounter
fpsSkipped uint
shouldSkipFrame bool
didSkipFrame bool
errFrameSkip = fmt.Errorf("Above %v FPS, skipping frame", MaxFps)
)
func Init() error {
err := termbox.Init()
if err != nil {
return fmt.Errorf("Could not init terminal: %v", err)
}
err = clearWithDefaultColors()
if err != nil {
return fmt.Errorf("Could not clear terminal: %v", err)
}
termbox.SetInputMode(termbox.InputAlt)
hideCursor()
internalEventProxying()
StartEventPolling()
fpsCounter = NewFpsCounter(time.Second)
go func() {
for fps := range fpsCounter.Fps {
log.Debug.Printf("FPS: %v (%v frames skipped)", fps, fpsSkipped)
fpsSkipped = 0
}
}()
go func() {
for _ = range paintChan {
paintThrottled()
}
}()
return nil
}
func internalEventProxying() {
go func() {
for {
tbEvent := <-internalEvents
ev := Event{Event: &tbEvent, Handled: false}
switch {
case ev.Type == termbox.EventResize:
log.Debug.Println("Received Resize event, clearing screen " +
"and setting new size")
clearWithDefaultColors()
paintForced()
ev.Handled = true
case ev.Type == termbox.EventKey && firstResponder != nil:
firstResponder.HandleEvent(&ev)
}
Events <- ev
}
}()
}
func StartEventPolling() {
go func() {
for {
select {
case <-stopPolling:
return
case internalEvents <- termbox.PollEvent():
}
}
}()
}
func StopEventPolling() {
stopPolling <- struct{}{}
}
func SetPainter(p Painter) {
rootPainter = p
rootPainter.SetPaintSubscriber(func() { paintChan <- struct{}{} })
paintChan <- struct{}{}
}
func SetFirstResponder(eh Responder) {
if firstResponder != nil {
firstResponder.SetCursorPainter(nil)
}
if eh != nil {
eh.SetCursorPainter(func(pos Point) { setCursor(pos) })
}
firstResponder = eh
}
func paintThrottled() error {
if shouldSkipFrame {
didSkipFrame = true
fpsSkipped++
return errFrameSkip
}
shouldSkipFrame = true
time.AfterFunc(frameInterval, func() {
shouldSkipFrame = false
if didSkipFrame {
didSkipFrame = false
paintChan <- struct{}{}
}
})
return paintForced()
}
func paintForced() error {
err := rootPainter.PaintTo(&rootBuffer, NewRectFromTulib(rootBuffer.Rect))
if err != nil {
return err
}
if firstResponder == nil {
hideCursor()
}
err = flush()
if err != nil {
return err
}
fpsCounter.Ticks <- struct{}{}
return nil
}
func Sync() error {
mutex.Lock()
err := termbox.Sync()
mutex.Unlock()
return err
}
func clearRect(buffer *tulib.Buffer, rect Rect) {
buffer.Fill(rect.TulibRect(), termbox.Cell{Ch: ' '})
}
func clearWithDefaultColors() error {
return clear(termbox.ColorDefault, termbox.ColorDefault)
}
func clear(fg, bg termbox.Attribute) error {
mutex.Lock()
err := termbox.Clear(fg, bg)
mutex.Unlock()
updateRootBuffer()
return err
}
func updateRootBuffer() {
mutex.Lock()
rootBuffer = tulib.TermboxBuffer()
mutex.Unlock()
}
func hideCursor() {
// Probably a bug: Cursor must be set to valid position before hiding
setCursor(PointZero)
termbox.HideCursor()
}
func setCursor(p Point) {
termbox.SetCursor(p.X, p.Y)
}
func flush() error {
mutex.Lock()
err := termbox.Flush()
mutex.Unlock()
updateRootBuffer()
return err
}
func Close() {
mutex.Lock()
termbox.Close()
mutex.Unlock()
}