rind: Add seek keypresses

- Ctrl+Right seeks forward by 10 seconds
- Ctrl+Left seeks backwards by 10 seconds

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

rind/gst.py

@@ -5,7 +5,7 @@ import datetime
 import gi
 import sys
 gi.require_version("Gst", "1.0")
-from gi.repository import Gst, GLib
+from gi.repository import Gst, GLib, Gdk
 
 Gst.init(sys.argv)
 Adjustment  = gtk.Builder.get_object("progress_adjustment")
@@ -77,6 +77,15 @@ class EmmentalAudio:
         else:
             self.load(curds.PlaylistManager.track)
 
+    def on_key_press(self, widget, event):
+        key  = Gdk.keyval_name(event.keyval)
+        ctrl = event.state & Gdk.ModifierType.CONTROL_MASK
+        step = 10 * Gst.SECOND
+        if ctrl and key in ("Left", "Right"):
+            self.seek_step(step if key == "Right" else -step)
+            return True
+        return False
+
     def on_message(self, bus, message):
         if message.type == Gst.MessageType.ASYNC_DONE:
             state = message.src.get_state(Gst.Format.TIME)
@@ -122,6 +131,15 @@ class EmmentalAudio:
             pos = (dur * value) / 100.0
             self.playbin.seek_simple(Gst.Format.TIME, Gst.SeekFlags.FLUSH, pos)
 
+    def seek_step(self, step):
+        (res1, dur) = self.playbin.query_duration(Gst.Format.TIME)
+        (res2, pos) = self.playbin.query_position(Gst.Format.TIME)
+        if res1 == True and res2 == True:
+            pos += step
+            if pos < 0:   pos = 0
+            if pos > dur: pos = dur
+            self.playbin.seek_simple(Gst.Format.TIME, Gst.SeekFlags.FLUSH, pos)
+
     def set_volume(self, button, value):
         self.playbin.set_property("volume", value / 100.0)
 
@@ -149,3 +167,4 @@ Audio = EmmentalAudio()
 
 for button in [ NextButton, PauseButton, PlayButton, PrevButton ]:
     button.connect("can-activate-accel", gtk.can_activate_accel)
+gtk.Window.connect("key-press-event", Audio.on_key_press)

rind/test_gst.py

@@ -162,6 +162,13 @@ class TestGst(unittest.TestCase):
         self.assertEqual(gst.Position.get_text(),  "00:01")
         self.assertEqual(gst.Duration.get_text(), "-00:02")
 
+        self.audio.seek_step(step=0.5 * Gst.SECOND)
+        self.main_loop(delay=0.1)
+        self.assertEqual(self.audio_duration(), 3.0)
+        self.assertEqual(self.audio.position(), 1.5)
+        self.assertEqual(gst.Position.get_text(),  "00:02")
+        self.assertEqual(gst.Duration.get_text(), "-00:01")
+
         gst.PlayButton.clicked()
         self.main_loop_until(Gst.State.PLAYING)
         self.assertTrue( gst.PauseButton.is_visible())