bcd03c4c4a
A popover is a special UI element which can be layered over the rest of the UI (i.e. it is painted last) and can fall anywhere on the screen, not just with the bounds of its parent's viewport/context. With these special abilities comes the restriction that only one popover may be visible on screen at once. Popovers are requested from the UI context passed to Draw calls and specify the anchor point and the desired dimensions. The popover is then fit to the available space and placed relative to the anchor point.
127 lines
2.8 KiB
Go
127 lines
2.8 KiB
Go
package ui
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"github.com/gdamore/tcell"
|
|
"github.com/gdamore/tcell/views"
|
|
"github.com/mattn/go-runewidth"
|
|
)
|
|
|
|
// A context allows you to draw in a sub-region of the terminal
|
|
type Context struct {
|
|
screen tcell.Screen
|
|
viewport *views.ViewPort
|
|
x, y int
|
|
onPopover func(*Popover)
|
|
}
|
|
|
|
func (ctx *Context) X() int {
|
|
x, _, _, _ := ctx.viewport.GetPhysical()
|
|
return x
|
|
}
|
|
|
|
func (ctx *Context) Y() int {
|
|
_, y, _, _ := ctx.viewport.GetPhysical()
|
|
return y
|
|
}
|
|
|
|
func (ctx *Context) Width() int {
|
|
width, _ := ctx.viewport.Size()
|
|
return width
|
|
}
|
|
|
|
func (ctx *Context) Height() int {
|
|
_, height := ctx.viewport.Size()
|
|
return height
|
|
}
|
|
|
|
func NewContext(width, height int, screen tcell.Screen, p func(*Popover)) *Context {
|
|
vp := views.NewViewPort(screen, 0, 0, width, height)
|
|
return &Context{screen, vp, 0, 0, p}
|
|
}
|
|
|
|
func (ctx *Context) Subcontext(x, y, width, height int) *Context {
|
|
vp_width, vp_height := ctx.viewport.Size()
|
|
if x < 0 || y < 0 {
|
|
panic(fmt.Errorf("Attempted to create context with negative offset"))
|
|
}
|
|
if x+width > vp_width || y+height > vp_height {
|
|
panic(fmt.Errorf("Attempted to create context larger than parent"))
|
|
}
|
|
vp := views.NewViewPort(ctx.viewport, x, y, width, height)
|
|
return &Context{ctx.screen, vp, ctx.x + x, ctx.y + y, ctx.onPopover}
|
|
}
|
|
|
|
func (ctx *Context) SetCell(x, y int, ch rune, style tcell.Style) {
|
|
width, height := ctx.viewport.Size()
|
|
if x >= width || y >= height {
|
|
panic(fmt.Errorf("Attempted to draw outside of context"))
|
|
}
|
|
crunes := []rune{}
|
|
ctx.viewport.SetContent(x, y, ch, crunes, style)
|
|
}
|
|
|
|
func (ctx *Context) Printf(x, y int, style tcell.Style,
|
|
format string, a ...interface{}) int {
|
|
width, height := ctx.viewport.Size()
|
|
|
|
if x >= width || y >= height {
|
|
panic(fmt.Errorf("Attempted to draw outside of context"))
|
|
}
|
|
|
|
str := fmt.Sprintf(format, a...)
|
|
|
|
old_x := x
|
|
|
|
newline := func() bool {
|
|
x = old_x
|
|
y++
|
|
return y < height
|
|
}
|
|
for _, ch := range str {
|
|
switch ch {
|
|
case '\n':
|
|
if !newline() {
|
|
return runewidth.StringWidth(str)
|
|
}
|
|
case '\r':
|
|
x = old_x
|
|
default:
|
|
crunes := []rune{}
|
|
ctx.viewport.SetContent(x, y, ch, crunes, style)
|
|
x += runewidth.RuneWidth(ch)
|
|
if x == old_x+width {
|
|
if !newline() {
|
|
return runewidth.StringWidth(str)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return runewidth.StringWidth(str)
|
|
}
|
|
|
|
func (ctx *Context) Fill(x, y, width, height int, rune rune, style tcell.Style) {
|
|
vp := views.NewViewPort(ctx.viewport, x, y, width, height)
|
|
vp.Fill(rune, style)
|
|
}
|
|
|
|
func (ctx *Context) SetCursor(x, y int) {
|
|
ctx.screen.ShowCursor(ctx.x+x, ctx.y+y)
|
|
}
|
|
|
|
func (ctx *Context) HideCursor() {
|
|
ctx.screen.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,
|
|
})
|
|
}
|