clapper-gtk: Pause video when dragging

Before we can do actual scrubbing, we need to pause playback and do seeks
while it is paused. Then restore playing state after dragging ends.

src/bin/clapper-app/clapper-app-window.c

@@ -471,11 +471,14 @@ scroll_cb (GtkEventControllerScroll *scroll,
 
   pickup = _pick_pointer_widget (self);
 
-  /* We do not want to accidentally allow this controller
+  /* We do not want to accidentally allow this controller to handle
-   * to handle scrolls when hovering over scrolled window */
+   * scrolls when hovering over widgets that also handle scroll */
-  if (pickup && (GTK_IS_SCROLLED_WINDOW (pickup)
+  while ((pickup && !CLAPPER_GTK_IS_VIDEO (pickup))) {
-      || gtk_widget_get_ancestor (pickup, GTK_TYPE_SCROLLED_WINDOW)))
+    if (GTK_IS_SCROLLED_WINDOW (pickup) || GTK_IS_RANGE (pickup))
-    return FALSE;
+      return FALSE;
+
+    pickup = gtk_widget_get_parent (pickup);
+  }
 
   device = gtk_event_controller_get_current_event_device (GTK_EVENT_CONTROLLER (scroll));
 

src/lib/clapper-gtk/clapper-gtk-seek-bar.c

@@ -57,6 +57,7 @@ struct _ClapperGtkSeekBar
 
   gboolean can_scrub;
   gboolean scrubbing;
+  gboolean was_playing;
 
   gboolean dragging;
   guint position_uint;
@@ -267,6 +268,14 @@ scale_css_classes_changed_cb (GtkWidget *widget,
 
   if ((self->dragging = dragging)) {
     GST_DEBUG_OBJECT (self, "Scale drag started");
+
+    if (G_LIKELY (self->player != NULL)) {
+      ClapperPlayerState state = clapper_player_get_state (self->player);
+
+      if ((self->was_playing = (state == CLAPPER_PLAYER_STATE_PLAYING)))
+        clapper_player_pause (self->player);
+    }
+
     return;
   }
 
@@ -289,6 +298,9 @@ scale_css_classes_changed_cb (GtkWidget *widget,
   } else {
     clapper_player_seek_custom (self->player, value, self->seek_method);
   }
+
+  if (self->was_playing)
+    clapper_player_play (self->player);
 }
 
 static void