add signal playlist.on_play_model_handling

feeluown/gui/components/line_song.py

@@ -1,16 +1,21 @@
+from typing import TYPE_CHECKING
+
 from PyQt5.QtCore import QTimer, QRect, Qt
 from PyQt5.QtGui import QFontMetrics, QPainter, QPalette
 from PyQt5.QtWidgets import QApplication, QLabel, QSizePolicy, QMenu
 
 from feeluown.gui.components import SongMenuInitializer
 
+if TYPE_CHECKING:
+    from feeluown.app.gui_app import GuiApp
+
 
 class LineSongLabel(QLabel):
     """Show song info in one line (with limited width)."""
 
     default_text = '...'
 
-    def __init__(self, app, parent=None):
+    def __init__(self, app: 'GuiApp', parent=None):
         super().__init__(text=self.default_text, parent=parent)
         self.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Preferred)
 
@@ -28,10 +33,12 @@ def __init__(self, app, parent=None):
 
         self._app.player.metadata_changed.connect(
             self.on_metadata_changed, aioqueue=True)
+        self._app.playlist.play_model_handling.connect(
+            self.on_play_model_handling, aioqueue=True)
 
     def on_metadata_changed(self, metadata):
         if not metadata:
-            self.setText('')
+            self.setText('...')
             return
 
         # Set main text.
@@ -43,6 +50,9 @@ def on_metadata_changed(self, metadata):
                 text += f" - {','.join(artists)}"
         self.setText(text)
 
+    def on_play_model_handling(self):
+        self.setText('正在加载歌曲...')
+
     def change_text_position(self):
         if not self.parent().isVisible():  # type: ignore
             self._timer.stop()

feeluown/gui/uimain/player_bar.py

@@ -1,4 +1,5 @@
 import logging
+from typing import TYPE_CHECKING
 
 from PyQt5.QtCore import Qt
 from PyQt5.QtWidgets import QFrame, QHBoxLayout, QVBoxLayout, QPushButton, QSizePolicy
@@ -15,12 +16,15 @@
 )
 from feeluown.gui.helpers import IS_MACOS
 
+if TYPE_CHECKING:
+    from feeluown.app.gui_app import GuiApp
+
 logger = logging.getLogger(__name__)
 
 
 class PlayerControlPanel(QFrame):
 
-    def __init__(self, app, parent=None):
+    def __init__(self, app: 'GuiApp', parent=None):
         super().__init__(parent)
         self._app = app
 

feeluown/player/playlist.py

@@ -129,6 +129,9 @@ def __init__(self, app: 'App', songs=None, playback_mode=PlaybackMode.loop,
         #    The *songs_removed* and *songs_added* signal.
         self.songs_removed = Signal()  # (index, count)
         self.songs_added = Signal()  # (index, count)
+        # .. versionadded:: 3.9.0
+        #    The *play_model_handling* signal.
+        self.play_model_handling = Signal()
 
         self._app.player.media_finished.connect(self._on_media_finished)
 
@@ -684,6 +687,7 @@ def play_model(self, model):
         """
         # Stop the player so that user know the action is working.
         self._app.player.stop()
+        self.play_model_handling.emit()
         task = self.set_current_model(model)
         if task is not None:
             def cb(future):