Method renderDepthBackground

texteditor/render.go:202–258

renderDepthBackground renders the depth background color.

(stln, edln int)

// renderDepthBackground renders the depth background color.
func (ed *Editor) renderDepthBackground(stln, edln int) {
	if ed.Buffer == nil {
		return
	}
	if !ed.Buffer.Options.DepthColor || ed.IsDisabled() || !ed.StateIs(states.Focused) {
		return
	}
	buf := ed.Buffer

	bb := ed.renderBBox()
	bln := buf.NumLines()
	sty := &ed.Styles
	isDark := matcolor.SchemeIsDark
	nclrs := len(viewDepthColors)
	lstdp := 0
	for ln := stln; ln <= edln; ln++ {
		lst := ed.charStartPos(lexer.Pos{Ln: ln}).Y // note: charstart pos includes descent
		led := lst + math32.Max(ed.renders[ln].BBox.Size().Y, ed.lineHeight)
		if int(math32.Ceil(led)) < bb.Min.Y {
			continue
		}
		if int(math32.Floor(lst)) > bb.Max.Y {
			continue
		}
		if ln >= bln { // may be out of sync
			continue
		}
		ht := buf.HiTags(ln)
		lsted := 0
		for ti := range ht {
			lx := &ht[ti]
			if lx.Token.Depth > 0 {
				var vdc color.RGBA
				if isDark { // reverse order too
					vdc = viewDepthColors[nclrs-1-lx.Token.Depth%nclrs]
				} else {
					vdc = viewDepthColors[lx.Token.Depth%nclrs]
				}
				bg := gradient.Apply(sty.Background, func(c color.Color) color.Color {
					if isDark { // reverse order too
						return colors.Add(c, vdc)
					}
					return colors.Sub(c, vdc)
				})

				st := min(lsted, lx.St)
				reg := text.Region{Start: lexer.Pos{Ln: ln, Ch: st}, End: lexer.Pos{Ln: ln, Ch: lx.Ed}}
				lsted = lx.Ed
				lstdp = lx.Token.Depth
				ed.renderRegionBoxStyle(reg, sty, bg, true) // full width alway
			}
		}
		if lstdp > 0 {
			ed.renderRegionToEnd(lexer.Pos{Ln: ln, Ch: lsted}, sty, sty.Background)
		}
	}
}