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