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package main
import (
"github.com/nsf/termbox-go"
)
var curCol = 0
var curRune = 0
var backbuf []termbox.Cell
var bbw, bbh int
var runes = []rune{' ', '░', '▒', '▓', '█'}
var colors = []termbox.Attribute{
termbox.ColorBlack,
termbox.ColorRed,
termbox.ColorGreen,
termbox.ColorYellow,
termbox.ColorBlue,
termbox.ColorMagenta,
termbox.ColorCyan,
termbox.ColorWhite,
}
type attrFunc func(int) (rune, termbox.Attribute, termbox.Attribute)
func updateAndDrawButtons(current *int, x, y int, mx, my int, n int, attrf attrFunc) {
lx, ly := x, y
for i := 0; i < n; i++ {
if lx <= mx && mx <= lx+3 && ly <= my && my <= ly+1 {
*current = i
}
r, fg, bg := attrf(i)
termbox.SetCell(lx+0, ly+0, r, fg, bg)
termbox.SetCell(lx+1, ly+0, r, fg, bg)
termbox.SetCell(lx+2, ly+0, r, fg, bg)
termbox.SetCell(lx+3, ly+0, r, fg, bg)
termbox.SetCell(lx+0, ly+1, r, fg, bg)
termbox.SetCell(lx+1, ly+1, r, fg, bg)
termbox.SetCell(lx+2, ly+1, r, fg, bg)
termbox.SetCell(lx+3, ly+1, r, fg, bg)
lx += 4
}
lx, ly = x, y
for i := 0; i < n; i++ {
if *current == i {
fg := termbox.ColorRed | termbox.AttrBold
bg := termbox.ColorDefault
termbox.SetCell(lx+0, ly+2, '^', fg, bg)
termbox.SetCell(lx+1, ly+2, '^', fg, bg)
termbox.SetCell(lx+2, ly+2, '^', fg, bg)
termbox.SetCell(lx+3, ly+2, '^', fg, bg)
}
lx += 4
}
}
func update_and_redraw_all(mx, my int) {
termbox.Clear(termbox.ColorDefault, termbox.ColorDefault)
if mx != -1 && my != -1 {
backbuf[bbw*my+mx] = termbox.Cell{Ch: runes[curRune], Fg: colors[curCol]}
}
copy(termbox.CellBuffer(), backbuf)
_, h := termbox.Size()
updateAndDrawButtons(&curRune, 0, 0, mx, my, len(runes), func(i int) (rune, termbox.Attribute, termbox.Attribute) {
return runes[i], termbox.ColorDefault, termbox.ColorDefault
})
updateAndDrawButtons(&curCol, 0, h-3, mx, my, len(colors), func(i int) (rune, termbox.Attribute, termbox.Attribute) {
return ' ', termbox.ColorDefault, colors[i]
})
termbox.Flush()
}
func reallocBackBuffer(w, h int) {
bbw, bbh = w, h
backbuf = make([]termbox.Cell, w*h)
}
func main() {
err := termbox.Init()
if err != nil {
panic(err)
}
defer termbox.Close()
termbox.SetInputMode(termbox.InputEsc | termbox.InputMouse)
reallocBackBuffer(termbox.Size())
update_and_redraw_all(-1, -1)
mainloop:
for {
mx, my := -1, -1
switch ev := termbox.PollEvent(); ev.Type {
case termbox.EventKey:
if ev.Key == termbox.KeyEsc {
break mainloop
}
case termbox.EventMouse:
if ev.Key == termbox.MouseLeft {
mx, my = ev.MouseX, ev.MouseY
}
case termbox.EventResize:
reallocBackBuffer(ev.Width, ev.Height)
}
update_and_redraw_all(mx, my)
}
}
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