playlist: Add some useful key presses

Escape to clear the list of selected tracks and Delete to remove tracks
from playlists.

Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>

playlist/__init__.py

@@ -1,5 +1,7 @@
 # Copyright 2021 (c) Anna Schumaker.
+import db
 import audio
+from gi.repository import Gdk
 from gi.repository import Gtk
 from . import footer
 from . import header
@@ -19,6 +21,10 @@ class Panel(Gtk.Box):
         self.append(Gtk.Separator.new(Gtk.Orientation.HORIZONTAL))
         self.append(self.footer)
 
+        keypress = Gtk.EventControllerKey.new()
+        keypress.connect("key-pressed", self.key_pressed)
+        self.add_controller(keypress)
+
         self.header.get_jump_button().connect("clicked", self.jump_clicked)
 
     def get_playlist(self): return self.window.get_playlist()
@@ -26,6 +32,19 @@ class Panel(Gtk.Box):
         self.header.set_playlist(plist)
         self.window.set_playlist(plist)
 
+    def key_pressed(self, event, keyval, keycode, state):
+        name = Gdk.keyval_name(keyval)
+        if name == "Escape":
+            self.window.clear_selection()
+            return True
+        elif name == "Delete":
+            playlist = self.get_playlist()
+            if playlist and playlist.can_add_remove_tracks():
+                for track in self.selected_tracks():
+                    playlist.remove_track(track)
+                return True
+        return False
+
     def jump_clicked(self, button):
         view = self.window.get_child()
         view.track_changed(audio.Player, None, audio.Player.track)

playlist/view.py

@@ -39,6 +39,9 @@ class PlaylistView(Gtk.ColumnView):
         for n in range(selection.get_size()):
             yield model.get_item(selection.get_nth(n))
 
+    def clear_selection(self):
+        self.get_model().unselect_all()
+
     def track_changed(self, player, old, new):
         selection = self.get_model()
         adjustment = self.get_vadjustment()
@@ -63,6 +66,7 @@ class PlaylistWindow(Gtk.ScrolledWindow):
     def get_playlist(self): return self.get_child().get_playlist()
     def set_playlist(self, plist): self.get_child().set_playlist(plist)
     def selected_tracks(self): return self.get_child().selected_tracks()
+    def clear_selection(self): self.get_child().clear_selection()
 
 
 class SortOrderView(Gtk.ListView):