termui/render.go
2015-10-13 12:45:03 -04:00

100 lines
2.2 KiB
Go

// 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.
package termui
import (
"time"
tm "github.com/nsf/termbox-go"
)
// Bufferer should be implemented by all renderable components.
type Bufferer interface {
Buffer() Buffer
}
// Init initializes termui library. This function should be called before any others.
// After initialization, the library must be finalized by 'Close' function.
func Init() error {
if err := tm.Init(); err != nil {
return err
}
sysEvtChs = make([]chan Event, 0)
go hookTermboxEvt()
renderJobs = make(chan []Bufferer)
go func() {
for bs := range renderJobs {
render(bs...)
}
}()
Body = NewGrid()
Body.X = 0
Body.Y = 0
Body.BgColor = ThemeAttr("bg")
Body.Width = TermWidth()
DefaultEvtStream.Init()
DefaultEvtStream.Merge("termbox", NewSysEvtCh())
DefaultEvtStream.Merge("timer", NewTimerCh(time.Second))
DefaultEvtStream.Merge("custom", usrEvtCh)
DefaultEvtStream.Handle("/", DefualtHandler)
DefaultEvtStream.Handle("/sys/wnd/resize", func(e Event) {
w := e.Data.(EvtWnd)
Body.Width = w.Width
})
DefaultWgtMgr = NewWgtMgr()
DefaultEvtStream.Hook(DefaultWgtMgr.WgtHandlersHook())
return nil
}
// Close finalizes termui library,
// should be called after successful initialization when termui's functionality isn't required anymore.
func Close() {
tm.Close()
}
// TermWidth returns the current terminal's width.
func TermWidth() int {
tm.Sync()
w, _ := tm.Size()
return w
}
// TermHeight returns the current terminal's height.
func TermHeight() int {
tm.Sync()
_, h := tm.Size()
return h
}
// Render renders all Bufferer in the given order from left to right,
// right could overlap on left ones.
func render(bs ...Bufferer) {
// set tm bg
tm.Clear(tm.ColorDefault, toTmAttr(ThemeAttr("bg")))
for _, b := range bs {
buf := b.Buffer()
// set cels in buf
for p, c := range buf.CellMap {
if p.In(buf.Area) {
tm.SetCell(p.X, p.Y, c.Ch, toTmAttr(c.Fg), toTmAttr(c.Bg))
}
}
}
// render
tm.Flush()
}
var renderJobs chan []Bufferer
func Render(bs ...Bufferer) {
go func() { renderJobs <- bs }()
}