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