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package view
import (
"errors"
"github.com/awesome-gocui/gocui"
)
// CursorDown moves the cursor down in the currently selected gocui pane, scrolling the screen as needed.
func CursorDown(g *gocui.Gui, v *gocui.View) error {
return CursorStep(g, v, 1)
}
// CursorUp moves the cursor up in the currently selected gocui pane, scrolling the screen as needed.
func CursorUp(g *gocui.Gui, v *gocui.View) error {
return CursorStep(g, v, -1)
}
// Moves the cursor the given step distance, setting the origin to the new cursor line
func CursorStep(g *gocui.Gui, v *gocui.View, step int) error {
cx, cy := v.Cursor()
// if there isn't a next line
line, err := v.Line(cy + step)
if err != nil {
return err
}
if len(line) == 0 {
return errors.New("unable to move the cursor, empty line")
}
if err := v.SetCursor(cx, cy+step); err != nil {
ox, oy := v.Origin()
if err := v.SetOrigin(ox, oy+step); err != nil {
return err
}
}
return nil
}
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