Method cursorDown

texteditor/nav.go:263–302

cursorDown moves the cursor down line(s)

(steps int)

// cursorDown moves the cursor down line(s)
func (ed *Editor) cursorDown(steps int) {
	ed.validateCursor()
	org := ed.CursorPos
	pos := ed.CursorPos
	for i := 0; i < steps; i++ {
		gotwrap := false
		if wln := ed.wrappedLines(pos.Ln); wln > 1 {
			si, ri, _ := ed.wrappedLineNumber(pos)
			if si < wln-1 {
				si++
				mxlen := min(len(ed.renders[pos.Ln].Spans[si].Text), ed.cursorColumn)
				if ed.cursorColumn < mxlen {
					ri = ed.cursorColumn
				} else {
					ri = mxlen
				}
				nwc, _ := ed.renders[pos.Ln].SpanPosToRuneIndex(si, ri)
				pos.Ch = nwc
				gotwrap = true

			}
		}
		if !gotwrap {
			pos.Ln++
			if pos.Ln >= ed.NumLines {
				pos.Ln = ed.NumLines - 1
				break
			}
			mxlen := min(ed.Buffer.LineLen(pos.Ln), ed.cursorColumn)
			if ed.cursorColumn < mxlen {
				pos.Ch = ed.cursorColumn
			} else {
				pos.Ch = mxlen
			}
		}
	}
	ed.SetCursorShow(pos)
	ed.cursorSelect(org)
	ed.NeedsRender()
}

// cursorPageDown moves the cursor down page(s), where a page is defined abcdef
// dynamically as just moving the cursor off the screen