Handle layout switching thru cinnamon, remove use of XApp.

ref: linuxmint/cinnamon#12758

Author: mtwebster

debian/control

@@ -34,7 +34,6 @@ Depends:
  gir1.2-gobject-2.0,
  gir1.2-gtk-3.0,
  gir1.2-pango-1.0,
- gir1.2-xapp-1.0,
  iso-flag-png,
  libxdo3,
  python3,

src/dbusdepot/cinnamonClient.py

@@ -1,27 +1,98 @@
 #!/usr/bin/python3
 
-from gi.repository import Gio, CScreensaver
+from gi.repository import Gio, CScreensaver, GObject
 
 from dbusdepot.baseClient import BaseClient
+from util import trackers
+
+# see cinnamon/files/usr/share/cinnamon/cinnamon-settings/bin/InputSources.py
+class CurrentInputSource:
+    def __init__(self, source):
+        self.type, self.id, self.index,         \
+            self.display_name, self.short_name, \
+            self.flag_name, self.xkbid,         \
+            self.xkb_layout, self.xkb_variant,  \
+            self.preferences,                   \
+            self.dupe_id, self.active           \
+                 = source
 
 class CinnamonClient(BaseClient):
     """
-    Simple client to talk to Cinnamon's dbus interface.  Currently
-    its only use is for attempting to force an exit from overview
-    and expo mode (both of which do a fullscreen grab and would prevent
-    the screensaver from acquiring one.)
+    Client to talk to Cinnamon's dbus interface.
+
+    Used to deactivate special modal cinnamon states and deal with
+    keyboard layout info.
     """
     CINNAMON_SERVICE = "org.Cinnamon"
     CINNAMON_PATH    = "/org/Cinnamon"
-
+    __gsignals__ = {
+        'current-input-source-changed': (GObject.SignalFlags.RUN_LAST, None, ()),
+        'input-sources-changed': (GObject.SignalFlags.RUN_LAST, None, ())
+    }
     def __init__(self):
         super(CinnamonClient, self).__init__(Gio.BusType.SESSION,
                                              CScreensaver.CinnamonProxy,
                                              self.CINNAMON_SERVICE,
                                              self.CINNAMON_PATH)
+        self.sources = []
 
     def on_client_setup_complete(self):
-        pass
+        trackers.con_tracker_get().connect(self.proxy, "g-signal", self.on_cinnamon_signal)
+        self.update_layout_sources()
+
+    def on_cinnamon_signal(self, proxy, sender, signal, params, data=None):
+        if signal == "CurrentInputSourceChanged":
+            self.update_current_layout(params[0])
+        elif signal == "InputSourcesChanged":
+            self.update_layout_sources()
+
+    def update_layout_sources(self):
+        self.proxy.GetInputSources(result_handler=self.get_input_sources_callback,
+                                   error_handler=self.get_input_sources_error)
+
+    def get_input_sources_callback(self, proxy, sources, data=None):
+        self.sources = []
+
+        for source in sources:
+            input_source = CurrentInputSource(source)
+            if input_source.type == "xkb":
+                self.sources.append(input_source)
+        self.emit("input-sources-changed")
+
+    def get_input_sources_error(self, proxy, error, data=None):
+        print("Failed to get keyboard layouts from Cinnamon - multiple layouts will not be available: %s" % error.message)
+
+    def has_multiple_keyboard_layouts(self):
+        return len(self.sources) > 1
+
+    def update_current_layout(self, layout):
+        for source in self.sources:
+            source.active = source.id == layout
+        self.emit("current-input-source-changed")
+
+    def get_current_layout_source(self):
+        for source in self.sources:
+            if source.active:
+                return source
+        return None
+
+    def activate_layout_index(self, index):
+        self.proxy.ActivateInputSourceIndex("(i)", index)
+
+    def activate_next_layout(self):
+        current = 0
+
+        for i in range(0, len(self.sources)):
+            source = self.sources[i]
+            if source.active:
+                current = i
+                break
+
+        new = current + 1
+        if new > len(self.sources) - 1:
+            new = 0
+
+        self.proxy.ActivateInputSourceIndex("(i)", self.sources[new].index)
 
     def exit_expo_and_overview(self):
         if self.ensure_proxy_alive():

src/passwordEntry.py

@@ -33,20 +33,13 @@ def __init__(self):
         trackers.con_tracker_get().connect(self, "icon-press", self.on_icon_pressed)
 
         self.placeholder_text = placeholder_text
-        self.current_icon_name = None
-        self.current_flag_id = 0
-        self.original_group = 0
+        self.lockscreen_layout_source = None
+        self.system_layout_source = None
 
-        self.keyboard_controller = singletons.KeyboardLayoutController
-        trackers.con_tracker_get().connect(self.keyboard_controller,
-                                           "config-changed",
-                                           self.on_config_changed)
-
-        trackers.con_tracker_get().connect(self.keyboard_controller,
-                                           "layout-changed",
-                                           self.on_layout_changed)
-
-        self.set_lockscreen_keyboard_layout()
+        self.cinnamon = singletons.CinnamonClient
+        self.cinnamon.connect("current-input-source-changed", self.on_current_layout_changed)
+        self.cinnamon.connect("input-sources-changed", self.on_layout_sources_changed)
+        self.on_layout_sources_changed(self.cinnamon)
 
         trackers.con_tracker_get().connect(self,
                                            "destroy",
@@ -59,25 +52,18 @@ def on_draw(self, widget, cr, data=None):
         update_layout_icon(), just so GtkEntry thinks there's an icon there,
         that way it allocates space for it, and responds to clicks in the area.
         """
-        if not self.keyboard_controller.get_enabled():
-            return False
-
         icon_rect = widget.get_icon_area(Gtk.EntryIconPosition.PRIMARY)
         x = icon_rect.x
         y = icon_rect.y + 2
         width = (icon_rect.width // 2) * 2
         height = icon_rect.height - 4
 
         handled = False
-
         if settings.get_show_flags():
-            name = self.keyboard_controller.get_current_icon_name()
-
             ui_scale = self.get_scale_factor()
 
-            if name:
-                filename = "/usr/share/iso-flag-png/%s.png" % name
-
+            if self.lockscreen_layout_source.flag_name != "":
+                filename = "/usr/share/iso-flag-png/%s.png" % self.lockscreen_layout_source.flag_name
                 try:
                     pixbuf = GdkPixbuf.Pixbuf.new_from_file_at_size(filename, -1, height * ui_scale)
 
@@ -98,26 +84,37 @@ def on_draw(self, widget, cr, data=None):
 
                     cr.paint()
 
-                    self.keyboard_controller.render_cairo_subscript(cr,
-                                                                    render_x + (logical_width / 2),
-                                                                    render_y + (logical_height / 2),
-                                                                    logical_width / 2,
-                                                                    logical_height / 2,
-                                                                    self.keyboard_controller.get_current_flag_id())
+                    if self.lockscreen_layout_source.dupe_id > 0:
+                        x = render_x + logical_width / 2
+                        y = render_y + logical_height / 2
+                        width = logical_width / 2 + 2
+                        height = logical_height / 2 + 2
+
+                        cr.set_source_rgba(0, 0, 0, 0.5)
+                        cr.rectangle(x, y, width, height)
+                        cr.fill()
+
+                        cr.set_source_rgba(1.0, 1.0, 1.0, 0.8)
+                        cr.rectangle(x + 1, y + 1, width - 2, height - 2)
+                        cr.fill()
+
+                        cr.set_source_rgba(0.0, 0.0, 0.0, 1.0)
+                        cr.select_font_face("sans", cairo.FontSlant.NORMAL, cairo.FontWeight.BOLD)
+                        cr.set_font_size(height - 2.0)
+
+                        dupe_str = str(self.lockscreen_layout_source.dupe_id)
+
+                        ext = cr.text_extents(dupe_str)
+                        cr.move_to((x + (width / 2.0) - (ext.width / 2.0)),
+                                   (y + (height / 2.0) + (ext.height / 2.0)))
+                        cr.show_text(dupe_str)
 
                     handled = True
                 except GLib.Error:
                     pass
 
         if not handled:
-            if settings.get_use_layout_variant_names():
-                name = self.keyboard_controller.get_current_variant_label()
-            else:
-                name = self.keyboard_controller.get_current_short_group_label()
-
-            if settings.get_show_upper_case_layout():
-                name = name.upper()
-
+            name = self.lockscreen_layout_source.short_name
             ctx = widget.get_style_context()
             ctx.save()
 
@@ -167,16 +164,27 @@ def pulse(self):
         self.progress_pulse()
         return True
 
-    def on_layout_changed(self, controller, layout):
+    def on_current_layout_changed(self, cinnamon):
+        if not self.cinnamon.has_multiple_keyboard_layouts():
+            return
+
+        self.lockscreen_layout_source = self.cinnamon.get_current_layout_source()
+
         self.grab_focus()
         self.update_layout_icon()
 
-    def on_config_changed(self, controller):
+    def on_layout_sources_changed(self, cinnamon):
+        if not self.cinnamon.has_multiple_keyboard_layouts():
+            return
+
+        self.system_layout_source = self.cinnamon.get_current_layout_source()
+        self.lockscreen_layout_source = self.system_layout_source
+
         self.set_lockscreen_keyboard_layout()
 
     def on_icon_pressed(self, entry, icon_pos, event):
         if icon_pos == Gtk.EntryIconPosition.PRIMARY:
-            self.keyboard_controller.next_group()
+            self.cinnamon.activate_next_layout()
         elif icon_pos == Gtk.EntryIconPosition.SECONDARY:
             if self.get_input_purpose() == Gtk.InputPurpose.FREE_FORM:
                 self.set_visibility(False)
@@ -195,62 +203,46 @@ def update_layout_icon(self):
         also ensures a redraw at the correct time to update the flag image.
         """
         self.set_icon_from_icon_name(Gtk.EntryIconPosition.PRIMARY, "screensaver-blank")
-        self.set_icon_tooltip_text(Gtk.EntryIconPosition.PRIMARY, self.keyboard_controller.get_current_name())
-
-        self.update_saved_group(self.keyboard_controller.get_current_group())
+        self.set_icon_tooltip_text(Gtk.EntryIconPosition.PRIMARY, self.lockscreen_layout_source.display_name)
 
     def on_destroy(self, widget, data=None):
         self.stop_progress()
 
-        trackers.con_tracker_get().disconnect(self.keyboard_controller,
-                                              "config-changed",
-                                              self.on_config_changed)
-
-        trackers.con_tracker_get().disconnect(self.keyboard_controller,
-                                              "layout-changed",
-                                              self.on_layout_changed)
-
         self.restore_original_layout()
 
     def set_lockscreen_keyboard_layout(self):
-        if not self.keyboard_controller.get_enabled():
-            return
-
         # If there are multiple keyboard layouts, we want to store
         # the one the user ends up using in the unlock widget, as they'll
         # want to use the same one each time, at least until they change
         # their password.
 
-        saved_group = settings.get_kb_group()
-        self.original_group = self.keyboard_controller.get_current_group()
-
-        new_group = 0
+        saved_index = settings.get_kb_group()
+        new_index = 0
 
-        if saved_group == -1:
-            new_group = self.original_group
+        if saved_index == -1:
+            new_index = self.system_layout_source.index
+            settings.set_kb_group(new_index)
         else:
-            new_group = saved_group
+            new_index = saved_index
+
+        if new_index != self.system_layout_source.index:
+            self.cinnamon.activate_layout_index(new_index)
 
-        self.keyboard_controller.set_current_group(new_group)
-        self.update_saved_group(new_group)
         self.update_layout_icon()
 
         trackers.con_tracker_get().connect(self,
                                            "draw",
                                            self.on_draw)
 
-    def update_saved_group(self, group):
-        settings.set_kb_group(group)
-
     def restore_original_layout(self):
         """
         Called when the unlock dialog is destroyed, restores
         the group that was active before the screensaver was activated.
         """
-        if not self.keyboard_controller.get_enabled():
-            return
+        if settings.get_kb_group() != self.lockscreen_layout_source.index:
+            settings.set_kb_group(self.lockscreen_layout_source.index)
 
-        self.keyboard_controller.set_current_group(self.original_group)
+        self.cinnamon.activate_layout_index(self.system_layout_source.index)
 
     def grab_focus(self):
         Gtk.Widget.grab_focus(self)

src/singletons.py

@@ -48,12 +48,6 @@
 Backgrounds.load_from_preferences(settings.bg_settings)
 settings.bg_settings.connect("changed", lambda s,k: Backgrounds.load_from_preferences(s))
 
-# We use XAppKbdLayoutController as a wrapper around libgnomekbd to supply the icon theme
-# with icons, as well as providing correct group names.
-gi.require_version('XApp', '1.0')
-from gi.repository import XApp
-KeyboardLayoutController = XApp.KbdLayoutController()
-
 # This sets up synchronously, as we need to know the fractional scaling state before
 # setting up the screensaver.
 MuffinClient = _MuffinClient()