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|
package ui
import (
"fmt"
"git.sr.ht/~rockorager/vaxis"
)
// A context allows you to draw in a sub-region of the terminal
type Context struct {
window vaxis.Window
x, y int
onPopover func(*Popover)
}
func (ctx *Context) Width() int {
width, _ := ctx.window.Size()
return width
}
func (ctx *Context) Height() int {
_, height := ctx.window.Size()
return height
}
// returns the vaxis Window for this context
func (ctx *Context) Window() vaxis.Window {
return ctx.window
}
func NewContext(vx *vaxis.Vaxis, p func(*Popover)) *Context {
win := vx.Window()
return &Context{win, 0, 0, p}
}
func (ctx *Context) Subcontext(x, y, width, height int) *Context {
if x < 0 || y < 0 {
panic(fmt.Errorf("Attempted to create context with negative offset"))
}
win := ctx.window.New(x, y, width, height)
return &Context{win, x, y, ctx.onPopover}
}
func (ctx *Context) SetCell(x, y int, ch rune, style vaxis.Style) {
width, height := ctx.window.Size()
if x >= width || y >= height {
// no-op when dims are inadequate
return
}
ctx.window.SetCell(x, y, vaxis.Cell{
Character: vaxis.Character{
Grapheme: string(ch),
},
Style: style,
})
}
func (ctx *Context) Printf(x, y int, style vaxis.Style,
format string, a ...interface{},
) int {
width, height := ctx.window.Size()
if x >= width || y >= height {
// no-op when dims are inadequate
return 0
}
str := fmt.Sprintf(format, a...)
buf := StyledString(str)
ApplyAttrs(buf, style)
old_x := x
newline := func() bool {
x = old_x
y++
return y < height
}
for _, sr := range buf.Cells {
switch sr.Grapheme {
case "\n":
if !newline() {
return buf.Len()
}
case "\r":
x = old_x
default:
ctx.window.SetCell(x, y, sr)
x += sr.Width
if x == old_x+width {
if !newline() {
return buf.Len()
}
}
}
}
return buf.Len()
}
func (ctx *Context) Fill(x, y, width, height int, rune rune, style vaxis.Style) {
win := ctx.window.New(x, y, width, height)
win.Fill(vaxis.Cell{
Character: vaxis.Character{
Grapheme: string(rune),
Width: 1,
},
Style: style,
})
}
func (ctx *Context) SetCursor(x, y int, style vaxis.CursorStyle) {
ctx.window.ShowCursor(x, y, style)
}
func (ctx *Context) HideCursor() {
ctx.window.Vx.HideCursor()
}
func (ctx *Context) Popover(x, y, width, height int, d Drawable) {
ctx.onPopover(&Popover{
x: ctx.x + x,
y: ctx.y + y,
width: width,
height: height,
content: d,
})
}
func (ctx *Context) Size() (int, int) {
return ctx.window.Size()
}
|
