Prevent viewer updates on timeline drag (#175).

6 files changed, 33 insertions, 19 deletions

diff --git a/src/lib/content.cc b/src/lib/content.cc
index 6a33e9f7e..49c579fb6 100644
--- a/src/lib/content.cc
+++ b/src/lib/content.cc
@@ -24,6 +24,7 @@
 #include "util.h"
 
 using std::string;
+using std::set;
 using boost::shared_ptr;
 using boost::lexical_cast;
 
@@ -33,6 +34,7 @@ int const ContentProperty::LENGTH = 401;
 Content::Content (shared_ptr<const Film> f, Time s)
 	: _film (f)
 	, _start (s)
+	, _change_signals_frequent (false)
 {
 
 }
@@ -41,12 +43,14 @@ Content::Content (shared_ptr<const Film> f, boost::filesystem::path p)
 	: _film (f)
 	, _file (p)
 	, _start (0)
+	, _change_signals_frequent (false)
 {
 
 }
 
 Content::Content (shared_ptr<const Film> f, shared_ptr<const cxml::Node> node)
 	: _film (f)
+	, _change_signals_frequent (false)
 {
 	_file = node->string_child ("File");
 	_digest = node->string_child ("Digest");
@@ -59,6 +63,7 @@ Content::Content (Content const & o)
 	, _file (o._file)
 	, _digest (o._digest)
 	, _start (o._start)
+	, _change_signals_frequent (o._change_signals_frequent)
 {
 
 }
@@ -83,7 +88,7 @@ Content::examine (shared_ptr<Job>)
 void
 Content::signal_changed (int p)
 {
-	Changed (shared_from_this (), p);
+	Changed (shared_from_this (), p, _change_signals_frequent);
 }
 
 void
diff --git a/src/lib/content.h b/src/lib/content.h
index a190a393f..cd8914cba 100644
--- a/src/lib/content.h
+++ b/src/lib/content.h
@@ -20,6 +20,7 @@
 #ifndef DCPOMATIC_CONTENT_H
 #define DCPOMATIC_CONTENT_H
 
+#include <set>
 #include <boost/filesystem.hpp>
 #include <boost/signals2.hpp>
 #include <boost/thread/mutex.hpp>
@@ -79,7 +80,11 @@ public:
 		return start() + length();
 	}
 
-	boost::signals2::signal<void (boost::weak_ptr<Content>, int)> Changed;
+	void set_change_signals_frequent (bool f) {
+		_change_signals_frequent = f;
+	}
+
+	boost::signals2::signal<void (boost::weak_ptr<Content>, int, bool)> Changed;
 
 protected:
 	void signal_changed (int);
@@ -91,6 +96,7 @@ private:
 	boost::filesystem::path _file;
 	std::string _digest;
 	Time _start;
+	bool _change_signals_frequent;
 };
 
 #endif
diff --git a/src/lib/player.cc b/src/lib/player.cc
index 6ee8c5029..50f401fb7 100644
--- a/src/lib/player.cc
+++ b/src/lib/player.cc
@@ -97,7 +97,7 @@ Player::Player (shared_ptr<const Film> f, shared_ptr<const Playlist> p)
 	, _audio_buffers (f->dcp_audio_channels(), 0)
 {
 	_playlist->Changed.connect (bind (&Player::playlist_changed, this));
-	_playlist->ContentChanged.connect (bind (&Player::content_changed, this, _1, _2));
+	_playlist->ContentChanged.connect (bind (&Player::content_changed, this, _1, _2, _3));
 	_film->Changed.connect (bind (&Player::film_changed, this, _1));
 	set_video_container_size (_film->container()->size (_film->full_frame ()));
 }
@@ -461,7 +461,7 @@ Player::setup_pieces ()
 }
 
 void
-Player::content_changed (weak_ptr<Content> w, int p)
+Player::content_changed (weak_ptr<Content> w, int property, bool frequent)
 {
 	shared_ptr<Content> c = w.lock ();
 	if (!c) {
@@ -469,16 +469,16 @@ Player::content_changed (weak_ptr<Content> w, int p)
 	}
 
 	if (
-		p == ContentProperty::START || p == ContentProperty::LENGTH ||
-		p == VideoContentProperty::VIDEO_CROP || p == VideoContentProperty::VIDEO_RATIO
+		property == ContentProperty::START || property == ContentProperty::LENGTH ||
+		property == VideoContentProperty::VIDEO_CROP || property == VideoContentProperty::VIDEO_RATIO
 		) {
 		
 		_have_valid_pieces = false;
-		Changed ();
+		Changed (frequent);
 
-	} else if (p == SubtitleContentProperty::SUBTITLE_OFFSET || p == SubtitleContentProperty::SUBTITLE_SCALE) {
+	} else if (property == SubtitleContentProperty::SUBTITLE_OFFSET || property == SubtitleContentProperty::SUBTITLE_SCALE) {
 		update_subtitle ();
-		Changed ();
+		Changed (frequent);
 	}
 }
 
@@ -486,7 +486,7 @@ void
 Player::playlist_changed ()
 {
 	_have_valid_pieces = false;
-	Changed ();
+	Changed (false);
 }
 
 void
@@ -541,7 +541,7 @@ Player::film_changed (Film::Property p)
 	*/
 
 	if (p == Film::SCALER || p == Film::WITH_SUBTITLES || p == Film::CONTAINER) {
-		Changed ();
+		Changed (false);
 	}
 }
 
diff --git a/src/lib/player.h b/src/lib/player.h
index 92a358043..2d8eca9b3 100644
--- a/src/lib/player.h
+++ b/src/lib/player.h
@@ -71,8 +71,10 @@ public:
 	/** Emitted when something has changed such that if we went back and emitted
 	 *  the last frame again it would look different.  This is not emitted after
 	 *  a seek.
+	 *
+	 *  The parameter is true if these signals are currently likely to be frequent.
 	 */
-	boost::signals2::signal<void ()> Changed;
+	boost::signals2::signal<void (bool)> Changed;
 
 private:
 	friend class PlayerWrapper;
@@ -82,7 +84,7 @@ private:
 	void process_subtitle (boost::weak_ptr<Piece>, boost::shared_ptr<Image>, dcpomatic::Rect<double>, Time, Time);
 	void setup_pieces ();
 	void playlist_changed ();
-	void content_changed (boost::weak_ptr<Content>, int);
+	void content_changed (boost::weak_ptr<Content>, int, bool);
 	void do_seek (Time, bool);
 	void flush ();
 	void emit_black ();
diff --git a/src/lib/playlist.cc b/src/lib/playlist.cc
index 1535ad61f..5aa913bc7 100644
--- a/src/lib/playlist.cc
+++ b/src/lib/playlist.cc
@@ -70,13 +70,13 @@ Playlist::~Playlist ()
 }
 
 void
-Playlist::content_changed (weak_ptr<Content> c, int p)
+Playlist::content_changed (weak_ptr<Content> content, int property, bool frequent)
 {
-	if (p == ContentProperty::LENGTH) {
+	if (property == ContentProperty::LENGTH) {
 		maybe_sequence_video ();
 	}
 	
-	ContentChanged (c, p);
+	ContentChanged (content, property, frequent);
 }
 
 
@@ -285,7 +285,7 @@ Playlist::reconnect ()
 	_content_connections.clear ();
 		
 	for (ContentList::iterator i = _content.begin(); i != _content.end(); ++i) {
-		_content_connections.push_back ((*i)->Changed.connect (bind (&Playlist::content_changed, this, _1, _2)));
+		_content_connections.push_back ((*i)->Changed.connect (bind (&Playlist::content_changed, this, _1, _2, _3)));
 	}
 }
 
diff --git a/src/lib/playlist.h b/src/lib/playlist.h
index 805df4d70..0b928fe51 100644
--- a/src/lib/playlist.h
+++ b/src/lib/playlist.h
@@ -89,10 +89,11 @@ public:
 	void maybe_sequence_video ();
 
 	mutable boost::signals2::signal<void ()> Changed;
-	mutable boost::signals2::signal<void (boost::weak_ptr<Content>, int)> ContentChanged;
+	/** Third parameter is true if signals are currently being emitted frequently */
+	mutable boost::signals2::signal<void (boost::weak_ptr<Content>, int, bool)> ContentChanged;
 	
 private:
-	void content_changed (boost::weak_ptr<Content>, int);
+	void content_changed (boost::weak_ptr<Content>, int, bool);
 	void reconnect ();
 
 	ContentList _content;