Use GTK Composite Templates (close #62)

Use GTK Composite Templates for GUI elements to clean up and simplify
the code for widgets and all UI elements. This includes splitting the
large “gtk.glade” file into smaller .ui files and the large “widgets.py”
file into smaller .py files.

mcg/connectionpanel.py

@@ -0,0 +1,108 @@
+#!/usr/bin/env python3
+
+
+import gi
+gi.require_version('Gtk', '3.0')
+
+from gi.repository import Gtk, GObject
+
+from mcg.zeroconf import ZeroconfProvider
+
+
+
+
+@Gtk.Template(resource_path='/de/coderkun/mcg/ui/connection-panel.ui')
+class ConnectionPanel(Gtk.Box):
+    __gtype_name__ = 'McgConnectionPanel'
+    __gsignals__ = {
+        'connection-changed': (GObject.SIGNAL_RUN_FIRST, None, (str, int, str))
+    }
+
+    # Widgets
+    zeroconf_list = Gtk.Template.Child()
+    host_entry = Gtk.Template.Child()
+    port_spinner = Gtk.Template.Child()
+    password_entry = Gtk.Template.Child()
+
+
+    def __init__(self):
+        super().__init__()
+        self._services = Gtk.ListStore(str, str, int)
+        self._profile = None
+
+        # Zeroconf
+        self.zeroconf_list.set_model(self._services)
+        renderer = Gtk.CellRendererText()
+        column = Gtk.TreeViewColumn("Zeroconf", renderer, text=0)
+        self.zeroconf_list.append_column(column)
+
+        # Zeroconf provider
+        self._zeroconf_provider = ZeroconfProvider()
+        self._zeroconf_provider.connect_signal(ZeroconfProvider.SIGNAL_SERVICE_NEW, self.on_new_service)
+
+
+    def on_new_service(self, service):
+        name, host, port = service
+        self._services.append([name, host, port])
+
+
+    @Gtk.Template.Callback()
+    def on_service_selected(self, selection):
+        model, treeiter = selection.get_selected()
+        if treeiter != None:
+            service = model[treeiter]
+            self.set_host(service[1])
+            self.set_port(service[2])
+
+
+    @Gtk.Template.Callback()
+    def on_zeroconf_list_outfocused(self, widget, event):
+        self.zeroconf_list.get_selection().unselect_all()
+
+
+    @Gtk.Template.Callback()
+    def on_host_entry_outfocused(self, widget, event):
+        self._call_back()
+
+
+    @Gtk.Template.Callback()
+    def on_port_spinner_value_changed(self, widget):
+        self._call_back()
+
+
+    @Gtk.Template.Callback()
+    def on_password_entry_outfocused(self, widget, event):
+        self._call_back()
+
+
+    def set_host(self, host):
+        self.host_entry.set_text(host)
+
+
+    def get_host(self):
+        return self.host_entry.get_text()
+
+
+    def set_port(self, port):
+        self.port_spinner.set_value(port)
+
+
+    def get_port(self):
+        return self.port_spinner.get_value_as_int()
+
+
+    def set_password(self, password):
+        if password is None:
+            password = ""
+        self.password_entry.set_text(password)
+
+
+    def get_password(self):
+        if self.password_entry.get_text() == "":
+            return None
+        else:
+            return self.password_entry.get_text()
+
+
+    def _call_back(self):
+        self.emit('connection-changed', self.get_host(), self.get_port(), self.get_password(),)