func printmenu(w *gc.Window, menu []string, active int) {
y, x := 2, 2
w.Box(0, 0)
for i, s := range menu {
if i == active {
w.AttrOn(gc.A_REVERSE)
w.MovePrint(y+i, x, s)
w.AttrOff(gc.A_REVERSE)
} else {
w.MovePrint(y+i, x, s)
}
}
w.Refresh()
}
func main() {
stdscr, err := gc.Init()
if err != nil {
log.Fatal(err)
}
defer gc.End()
// Turn off character echo, hide the cursor and disable input buffering
gc.Echo(false)
gc.CBreak(true)
gc.Cursor(0)
stdscr.Print("Use arrow keys to move the window. Press 'q' to exit")
stdscr.NoutRefresh()
// Determine the center of the screen and offset those coordinates by
// half of the window size we are about to create. These coordinates will
// be used to move our window around the screen
rows, cols := stdscr.MaxYX()
height, width := 5, 10
y, x := (rows-height)/2, (cols-width)/2
// Create a new window centered on the screen and enable the use of the
// keypad on it so the arrow keys are available
var win *gc.Window
win, err = gc.NewWindow(height, width, y, x)
if err != nil {
log.Fatal(err)
}
win.Keypad(true)
main:
for {
// Clear the section of screen where the box is currently located so
// that it is blanked by calling Erase on the window and refreshing it
// so that the chances are sent to the virtual screen but not actually
// output to the terminal
win.Erase()
win.NoutRefresh()
// Move the window to it's new location (if any) and redraw it
win.MoveWindow(y, x)
win.Box(0, 0)
win.NoutRefresh()
// Update will flush only the characters which have changed between the
// physical screen and the virtual screen, minimizing the number of
// characters which must be sent
gc.Update()
// In order for the window to display correctly, we must call GetChar()
// on it rather than stdscr
switch win.GetChar() {
case 'q':
break main
case gc.KEY_LEFT:
if x > 0 {
x--
}
case gc.KEY_RIGHT:
if x < cols-width {
x++
}
case gc.KEY_UP:
if y > 1 {
y--
}
case gc.KEY_DOWN:
if y < rows-height {
y++
}
}
}
win.Delete()
}