Merge pull request #121 from RRRRRm/open_close

Add -open and -close options

README.md

@@ -54,6 +54,8 @@ $ nwg-drawer -h
 Usage of nwg-drawer:
   -c uint
     	number of Columns (default 6)
+  -close
+    	close drawer of existing instance
   -d	Turn on Debug messages
   -fm string
     	File Manager (default "thunar")
@@ -86,6 +88,8 @@ Usage of nwg-drawer:
     	Disable file search
   -o string
     	name of the Output to display the drawer on (sway & Hyprland only)
+  -open
+    	open drawer of existing instance
   -ovl
     	use OVerLay layer
   -pbexit string
@@ -137,6 +141,15 @@ this should be a little bit faster.
 Running a resident instance should speed up use of the drawer significantly. Pay attention to the fact, that you
 need to `pkill -f nwg-drawer` and reload the compositor to apply any new arguments!
 
+If you want to explicitly specify commands to open and close the resident instance, which can be helpful for touchpad gestures, please use the `-open` and `-close` parameters. Similarly, some signals can also be use: pkill -USR2 nwg-drawer to open and pkill -SIGRTMIN+3 nwg-drawer to close.
+
+For a MacOS-style three-finger pinch:
+
+```text
+bindgesture pinch:4:inward exec pkill -SIGUSR2 nwg-drawer
+bindgesture pinch:4:outward exec pkill -SIGRTMIN+3 nwg-drawer
+```
+
 ## Logging
 
 In case you encounter an issue, you may need debug messages. If you use the resident instance, you'll see nothing

main.go

@@ -155,6 +155,8 @@ var targetOutput = flag.String("o", "", "name of the Output to display the drawe
 var displayVersion = flag.Bool("v", false, "display Version information")
 var keyboard = flag.Bool("k", false, "set GTK layer shell Keyboard interactivity to 'on-demand' mode")
 var overlay = flag.Bool("ovl", false, "use OVerLay layer")
+var flagDrawerOpen = flag.Bool("open", false, "open drawer of existing instance")
+var flagDrawerClose = flag.Bool("close", false, "close drawer of existing instance")
 var gtkTheme = flag.String("g", "", "GTK theme name")
 var gtkIconTheme = flag.String("i", "", "GTK icon theme name")
 var iconSize = flag.Int("is", 64, "Icon Size")
@@ -201,8 +203,10 @@ func main() {
 	// v0.2: we also need to support SIGUSR from now on
 	showWindowChannel := make(chan interface{}, 1)
 	signalChan := make(chan os.Signal, 1)
-	signal.Notify(signalChan, syscall.SIGTERM, syscall.SIGUSR1)
-
+  const (
+    SIG25 = syscall.Signal(0x25) // Which is SIGRTMIN+3 on Linux, it's not used by the system
+  )
+	signal.Notify(signalChan, syscall.SIGTERM, syscall.SIGUSR1, syscall.SIGUSR2, SIG25)
 	go func() {
 		for {
 			s := <-signalChan
@@ -210,7 +214,7 @@ func main() {
 			case syscall.SIGTERM:
 				log.Info("SIGTERM received, bye bye")
 				gtk.MainQuit()
-			case syscall.SIGUSR1:
+				case syscall.SIGUSR1: // toggle drawer
 				if *resident {
 					// As win.Show() called from inside a goroutine randomly crashes GTK,
 					// let's just set e helper variable here. We'll be checking it with glib.TimeoutAdd.
@@ -225,6 +229,23 @@ func main() {
 					log.Info("SIGUSR1 received, and I'm not resident, bye bye")
 					gtk.MainQuit()
 				}
+				case syscall.SIGUSR2: // open drawer
+				if *resident {
+					log.Debug("SIGUSR2 received, showing the window")
+					showWindowChannel <- struct{}{}
+				} else {
+					log.Info("SIGUSR2 received, and I'm not resident but I'm still here, doing nothing")
+				}
+				case SIG25:  // colse drawer
+        if *resident {
+          log.Debug("SIG25 received, hiding the window")
+          if win.IsVisible() {
+            restoreStateAndHide()
+          }
+				} else {
+					log.Info("A signal received, and I'm not resident, bye bye")
+					gtk.MainQuit()
+				}
 			default:
 				log.Infof("Unknown signal: %s", s.String())
 			}
@@ -246,8 +267,17 @@ func main() {
 				if *resident {
 					log.Warnf("Resident instance already running (PID %v)", i)
 				} else {
-					log.Infof("Showing resident instance (PID %v)", i)
-					err := syscall.Kill(i, syscall.SIGUSR1)
+          var err error
+					if *flagDrawerClose {
+						log.Infof("Closing resident instance (PID %v)", i)
+						err = syscall.Kill(i, SIG25)
+					} else if *flagDrawerOpen {
+						log.Infof("Showing resident instance (PID %v)", i)
+						err = syscall.Kill(i, syscall.SIGUSR2)
+					} else {
+						log.Infof("Togging resident instance (PID %v)", i)
+						err = syscall.Kill(i, syscall.SIGUSR1)
+					}
 					if err != nil {
 						return
 					}
@@ -474,7 +504,7 @@ func main() {
 	win.Connect("key-press-event", func(_ *gtk.Window, event *gdk.Event) bool {
 		key := &gdk.EventKey{Event: event}
 		switch key.KeyVal() {
-		case gdk.KEY_downarrow, gdk.KEY_Up, gdk.KEY_Down, gdk.KEY_Left, gdk.KEY_Right, gdk.KEY_Tab,
+			case gdk.KEY_downarrow, gdk.KEY_Up, gdk.KEY_Down, gdk.KEY_Left, gdk.KEY_Right, gdk.KEY_Tab,
 			gdk.KEY_Return, gdk.KEY_Page_Up, gdk.KEY_Page_Down, gdk.KEY_Home, gdk.KEY_End:
 			return false
 
@@ -487,9 +517,9 @@ func main() {
 	})
 
 	/*
-		In case someone REALLY needed to use X11 - for some stupid Zoom meeting or something, this allows
-		the drawer to behave properly on Openbox, and possibly somewhere else. For sure not on i3.
-		This feature is not really supported and will stay undocumented.
+	In case someone REALLY needed to use X11 - for some stupid Zoom meeting or something, this allows
+	the drawer to behave properly on Openbox, and possibly somewhere else. For sure not on i3.
+	This feature is not really supported and will stay undocumented.
 	*/
 	if !wayland() {
 		log.Info("Not Wayland, oh really?")