feat: timeline audio-mode — hide clip span, draggable/resizable audio band

tests/test_ui_structure.py

@@ -274,6 +274,48 @@ def test_audio_region_tracks_cursor_and_length(win):
     assert win._timeline._audio_region is None
 
 
+def test_timeline_audio_mode_flag(win):
+    tl = win._timeline
+    tl.set_audio_mode(True)
+    assert tl._audio_mode is True
+    tl.set_audio_mode(False)
+    assert tl._audio_mode is False
+
+
+def test_timeline_audio_band_drag_move(win):
+    tl = win._timeline
+    tl._duration = 20.0
+    tl._view_start = 0.0; tl._view_span = 20.0     # full view
+    tl.resize(400, tl.height() or 80)
+    tl.set_audio_mode(True)
+    tl.set_audio_region(4.0, 8.0)                  # [4,8]
+    got = []
+    tl.audio_region_changed.connect(lambda s, e: got.append((s, e)))
+    # grab the middle of the band and drag it +2s
+    mid_t = 6.0
+    tl._audio_begin_drag_at_x(tl._time_to_x(mid_t))
+    tl._audio_drag_to_x(tl._time_to_x(mid_t + 2.0))
+    tl._audio_end_drag()
+    assert got, "audio_region_changed should fire on release"
+    s, e = tl._audio_region
+    assert abs((e - s) - 4.0) < 0.1 and s > 4.0     # same width, moved right
+    tl.set_audio_mode(False)
+
+
+def test_timeline_audio_band_resize_right(win):
+    tl = win._timeline
+    tl._duration = 20.0; tl._view_start = 0.0; tl._view_span = 20.0
+    tl.resize(400, tl.height() or 80)
+    tl.set_audio_mode(True)
+    tl.set_audio_region(4.0, 8.0)
+    tl._audio_begin_drag_at_x(tl._time_to_x(8.0))   # grab right edge
+    tl._audio_drag_to_x(tl._time_to_x(10.0))        # drag to 10
+    tl._audio_end_drag()
+    s, e = tl._audio_region
+    assert abs(s - 4.0) < 0.1 and abs(e - 10.0) < 0.2
+    tl.set_audio_mode(False)
+
+
 def test_audio_deck_tab_exists(win):
     # The old "Scan" deck tab is now "Audio".
     assert hasattr(win, "_tab_audio")