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render.go
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render.go
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package rty
import (
"fmt"
"github.com/gdamore/tcell"
)
func NewRTY(screen tcell.Screen) RTY {
return &rty{
screen: screen,
state: make(renderState),
}
}
type rty struct {
screen tcell.Screen
state renderState
}
type renderState map[string]interface{}
func (r *rty) Render(c Component) (err error) {
r.screen.Clear()
g := &renderGlobals{
prev: r.state,
next: make(renderState),
}
f := renderFrame{
canvas: newScreenCanvas(r.screen),
globals: g,
}
f.RenderChild(c)
r.screen.Show()
r.state = g.next
return g.err
}
func (r *rty) RegisterElementScroll(name string, children []string) (l *ElementScrollLayout, selectedChild string) {
r.state[name], selectedChild = adjustElementScroll(r.state[name], children)
return &ElementScrollLayout{
name: name,
}, selectedChild
}
func (r *rty) ElementScroller(name string) ElementScroller {
st, ok := r.state[name]
if !ok {
st = &ElementScrollState{}
r.state[name] = st
}
return &ElementScrollController{state: st.(*ElementScrollState)}
}
func (r *rty) TextScroller(name string) TextScroller {
st, ok := r.state[name]
if !ok {
st = &TextScrollState{}
r.state[name] = st
}
return &TextScrollController{state: st.(*TextScrollState)}
}
type renderGlobals struct {
err error
prev renderState
next renderState
}
func (g *renderGlobals) Get(key string) interface{} {
return g.prev[key]
}
func (g *renderGlobals) Set(key string, d interface{}) {
g.next[key] = d
}
func (g *renderGlobals) errorf(format string, a ...interface{}) {
if g.err != nil {
return
}
g.err = fmt.Errorf(format, a...)
}
type renderFrame struct {
canvas Canvas
style tcell.Style
globals *renderGlobals
}
var _ Writer = renderFrame{}
func (f renderFrame) SetContent(x int, y int, mainc rune, combc []rune) {
if mainc == 0 {
mainc = ' '
}
if err := f.canvas.SetContent(x, y, mainc, combc, f.style); err != nil {
f.error(err)
}
}
func (f renderFrame) Fill() (Writer, error) {
width, height := f.canvas.Size()
var err error
f.canvas, err = newSubCanvas(f.canvas, 0, 0, width, height, f.style)
if err != nil {
return nil, err
}
return f, nil
}
func (f renderFrame) Divide(x, y, width, height int) (Writer, error) {
var err error
f.canvas, err = newSubCanvas(f.canvas, x, y, width, height, f.style)
if err != nil {
return nil, err
}
return f, nil
}
func (f renderFrame) Foreground(c tcell.Color) Writer {
f.style = f.style.Foreground(c)
return f
}
func (f renderFrame) Background(c tcell.Color) Writer {
f.style = f.style.Background(c)
return f
}
func (f renderFrame) Invert() Writer {
f.style = f.style.Reverse(true)
return f
}
func (f renderFrame) RenderChild(c Component) int {
width, height := f.canvas.Size()
if err := c.Render(f, width, height); err != nil {
f.error(err)
}
_, height = f.canvas.Close()
return height
}
func (f renderFrame) RenderChildInTemp(c Component) Canvas {
width, _ := f.canvas.Size()
tmp := newTempCanvas(width, GROW, f.style)
f.canvas = tmp
if err := c.Render(f, width, GROW); err != nil {
f.error(err)
}
tmp.Close()
return tmp
}
func (f renderFrame) Embed(src Canvas, srcY int, srcHeight int) error {
width, destLines := f.canvas.Size()
numLines := destLines
if srcHeight < destLines {
numLines = srcHeight
}
for i := 0; i < numLines; i++ {
for j := 0; j < width; j++ {
mainc, combc, style, _, err := src.GetContent(j, srcY+i)
if err != nil {
return err
}
if err := f.canvas.SetContent(j, i, mainc, combc, style); err != nil {
f.error(err)
}
}
}
return nil
}
func (f renderFrame) RenderStateful(c StatefulComponent, name string) {
prev := f.globals.Get(name)
width, height := f.canvas.Size()
next, err := c.RenderStateful(f, prev, width, height)
if err != nil {
f.error(err)
}
f.globals.Set(name, next)
}
func (f renderFrame) errorf(fmt string, a ...interface{}) {
f.globals.errorf(fmt, a...)
}
func (f renderFrame) error(err error) {
f.globals.errorf("%s", err.Error())
}