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85 lines
1.3 KiB
Go
85 lines
1.3 KiB
Go
package cursor
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type View interface {
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Cursor() (int, int)
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Origin() (int, int)
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Speed() (int, int, int, int)
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SetCursor(int, int) error
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SetOrigin(int, int) error
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}
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func Down(v View) error {
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if v == nil {
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return nil
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}
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cx, cy := v.Cursor()
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_, _, sy, _ := v.Speed()
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err := v.SetCursor(cx, cy+sy)
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if err != nil {
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ox, oy := v.Origin()
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err := v.SetOrigin(ox, oy+sy)
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if 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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func Up(v View) error {
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if v == nil {
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return nil
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}
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ox, oy := v.Origin()
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cx, cy := v.Cursor()
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_, _, _, sy := v.Speed()
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err := v.SetCursor(cx, cy-sy)
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if err != nil && oy >= sy {
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err := v.SetOrigin(ox, oy-sy)
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if 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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func Right(v View) error {
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if v == nil {
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return nil
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}
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cx, cy := v.Cursor()
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sx, _, _, _ := v.Speed()
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err := v.SetCursor(cx+sx, cy)
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if err != nil {
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ox, oy := v.Origin()
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err := v.SetOrigin(ox+sx, oy)
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if 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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func Left(v View) error {
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if v == nil {
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return nil
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}
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ox, oy := v.Origin()
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cx, cy := v.Cursor()
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_, sx, _, _ := v.Speed()
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err := v.SetCursor(cx-sx, cy)
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if err != nil {
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err := v.SetCursor(0, cy)
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if err != nil {
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return err
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}
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if ox >= sx-cx {
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err := v.SetOrigin(ox-sx+cx, oy)
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if err != nil {
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return err
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}
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}
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}
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return nil
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}
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