94 lines
1.7 KiB
Go
94 lines
1.7 KiB
Go
package ui
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"github.com/nsf/termbox-go"
|
|
)
|
|
|
|
// A context allows you to draw in a sub-region of the terminal
|
|
type Context struct {
|
|
x int
|
|
y int
|
|
width int
|
|
height int
|
|
}
|
|
|
|
func (ctx *Context) Width() int {
|
|
return ctx.width
|
|
}
|
|
|
|
func (ctx *Context) Height() int {
|
|
return ctx.height
|
|
}
|
|
|
|
func NewContext(width, height int) *Context {
|
|
return &Context{0, 0, width, height}
|
|
}
|
|
|
|
func (ctx *Context) Subcontext(x, y, width, height int) *Context {
|
|
if x+width > ctx.width || y+height > ctx.height {
|
|
panic(fmt.Errorf("Attempted to create context larger than parent"))
|
|
}
|
|
return &Context{
|
|
x: ctx.x + x,
|
|
y: ctx.y + y,
|
|
width: width,
|
|
height: height,
|
|
}
|
|
}
|
|
|
|
func (ctx *Context) SetCell(x, y int, ch rune, fg, bg termbox.Attribute) {
|
|
if x >= ctx.width || y >= ctx.height {
|
|
panic(fmt.Errorf("Attempted to draw outside of context"))
|
|
}
|
|
termbox.SetCell(ctx.x+x, ctx.y+y, ch, fg, bg)
|
|
}
|
|
|
|
func (ctx *Context) Printf(x, y int, ref termbox.Cell,
|
|
format string, a ...interface{}) {
|
|
|
|
if x >= ctx.width || y >= ctx.height {
|
|
panic(fmt.Errorf("Attempted to draw outside of context"))
|
|
}
|
|
|
|
str := fmt.Sprintf(format, a...)
|
|
|
|
x += ctx.x
|
|
y += ctx.y
|
|
old_x := x
|
|
|
|
newline := func() bool {
|
|
x = old_x
|
|
y++
|
|
return y < ctx.height
|
|
}
|
|
for _, ch := range str {
|
|
switch ch {
|
|
case '\n':
|
|
if !newline() {
|
|
return
|
|
}
|
|
case '\r':
|
|
x = old_x
|
|
default:
|
|
termbox.SetCell(x, y, ch, ref.Fg, ref.Bg)
|
|
x++
|
|
if x == old_x+ctx.width {
|
|
if !newline() {
|
|
return
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func (ctx *Context) Fill(x, y, width, height int, ref termbox.Cell) {
|
|
_x := x
|
|
for ; y < height && y < ctx.height; y++ {
|
|
for ; x < width && x < ctx.width; x++ {
|
|
ctx.SetCell(x, y, ref.Ch, ref.Fg, ref.Bg)
|
|
}
|
|
x = _x
|
|
}
|
|
}
|