diff --git a/schermetto/num_display.py b/schermetto/num_display.py
index ecfb56c..cd9c63e 100755
--- a/schermetto/num_display.py
+++ b/schermetto/num_display.py
@@ -11,7 +11,7 @@ gi.require_version("Gtk", "3.0")
 gi.require_version("PangoCairo", "1.0")
 gi.require_version("Gdk", "3.0")
 gi.require_version("GLib", "2.0")
-from gi.repository import Gtk, Gio, cairo, Pango, Gdk, PangoCairo, GLib
+from gi.repository import Gtk, Gio, cairo, Pango, Gdk, PangoCairo, GLib, GObject
 
 
 def get_parser():
@@ -59,6 +59,29 @@ class App(Gtk.Application):
         self.window = None
         self.cli_args = cli_args
 
+        self._text = ""
+
+        self._stdin_buffer = ""
+
+        if self.cli_args.stdin:
+            os.set_blocking(sys.stdin.fileno(), False)
+            GLib.io_add_watch(sys.stdin.fileno(), GLib.IO_IN, self._on_stdin_data)
+
+    def _on_stdin_data(self, *args, **kwargs):
+        max_line_length = 16
+        incoming_data = sys.stdin.read(max_line_length)
+        if not incoming_data:
+            return True
+        self._stdin_buffer += incoming_data
+        if len(self._stdin_buffer) == max_line_length:
+            self._stdin_buffer += '\n'
+        if "\n" in self._stdin_buffer:
+            parts = self._stdin_buffer.split("\n")
+            self._stdin_buffer = parts[-1]
+            self.text = parts[-2]
+        return True
+
+
     def do_startup(self):
         Gtk.Application.do_startup(self)
 
@@ -80,6 +103,16 @@ class App(Gtk.Application):
     def on_quit(self, action, param):
         self.quit()
 
+    @GObject.Property(type=str,
+            default="",
+            flags=GObject.ParamFlags.READWRITE)
+    def text(self) -> str:
+        return self._text
+
+    @text.setter
+    def text(self, new_value: str):
+        self._text = new_value
+
 
 def get_color(description: str) -> Gdk.RGBA:
     rgba = Gdk.RGBA()
@@ -93,8 +126,6 @@ class AppWindow(Gtk.ApplicationWindow):
     def __init__(self, *args, **kwargs):
         self.app = kwargs["application"]
         super().__init__(*args, **kwargs)
-        self.text = ""
-        self.buffer = ""
         self.rotation = 0
         self.invert_colors = False
         self.drawing_area = Gtk.DrawingArea()
@@ -106,31 +137,16 @@ class AppWindow(Gtk.ApplicationWindow):
         if self.app.cli_args.fullscreen:
             self.fullscreen()
         self.show_all()
-        if self.app.cli_args.stdin:
-            os.set_blocking(sys.stdin.fileno(), False)
-            GLib.io_add_watch(sys.stdin.fileno(), GLib.IO_IN, self._on_stdin_data)
+
         if self.app.cli_args.invert_every > 0:
             GLib.timeout_add(self.app.cli_args.invert_every * 1000, self.swap_colors)
 
+        self.app.connect("notify::text", self.on_text_changed)
+
     def force_redraw(self):
         self.drawing_area.queue_draw()
 
-    def _on_stdin_data(self, *args, **kwargs):
-        max_line_length = 16
-        incoming_data = sys.stdin.read(max_line_length)
-        if not incoming_data:
-            return True
-        self.buffer += incoming_data
-        if len(self.buffer) == max_line_length:
-            self.buffer += '\n'
-        if "\n" in self.buffer:
-            parts = self.buffer.split("\n")
-            self.buffer = parts[-1]
-            self.change_text(parts[-2])
-        return True
-
-    def change_text(self, text: str):
-        self.text = text
+    def on_text_changed(self, app, text: str):
         self.force_redraw()
 
     def swap_colors(self):
@@ -165,7 +181,7 @@ class AppWindow(Gtk.ApplicationWindow):
         draw = self.drawing_area
         Gdk.cairo_set_source_rgba(cr, self.bg)
         cr.paint()
-        layout = draw.create_pango_layout(self.text)
+        layout = draw.create_pango_layout(self.app.text)
         layout.set_font_description(self.font)
         layout.set_alignment(Pango.Alignment.CENTER)
         w1, h1 = layout.get_pixel_size()