Various small fixes.
[dcpomatic.git] / src / wx / timeline.cc
index 52707e45c725de3bbd3ffbc661eb445cef4137aa..e1b507383e87523550279940d61608d9dca632b8 100644 (file)
 
 #include <list>
 #include <wx/graphics.h>
+#include <boost/weak_ptr.hpp>
+#include "lib/film.h"
+#include "lib/playlist.h"
+#include "film_editor.h"
 #include "timeline.h"
 #include "wx_util.h"
-#include "playlist.h"
 
 using std::list;
 using std::cout;
 using std::max;
 using boost::shared_ptr;
+using boost::weak_ptr;
+using boost::dynamic_pointer_cast;
 using boost::bind;
+using boost::optional;
 
-int const Timeline::_track_height = 64;
-
-Timeline::Timeline (wxWindow* parent, shared_ptr<Playlist> pl)
-       : wxPanel (parent)
-       , _playlist (pl)
+/** Parent class for components of the timeline (e.g. a piece of content or an axis) */
+class View : public boost::noncopyable
 {
-       SetDoubleBuffered (true);
+public:
+       View (Timeline& t)
+               : _timeline (t)
+       {
+
+       }
+
+       virtual ~View () {}
+               
+       void paint (wxGraphicsContext* g)
+       {
+               _last_paint_bbox = bbox ();
+               do_paint (g);
+       }
        
-       Connect (wxID_ANY, wxEVT_PAINT, wxPaintEventHandler (Timeline::paint), 0, this);
+       void force_redraw ()
+       {
+               _timeline.force_redraw (_last_paint_bbox);
+               _timeline.force_redraw (bbox ());
+       }
 
-       if (pl->audio_from() == Playlist::AUDIO_FFMPEG) {
-               SetMinSize (wxSize (640, _track_height * 2 + 96));
-       } else {
-               SetMinSize (wxSize (640, _track_height * (max (1UL, pl->audio().size()) + 1) + 96));
+       virtual dcpomatic::Rect<int> bbox () const = 0;
+
+protected:
+       virtual void do_paint (wxGraphicsContext *) = 0;
+       
+       int time_x (DCPTime t) const
+       {
+               return _timeline.tracks_position().x + t.seconds() * _timeline.pixels_per_second ();
        }
+       
+       Timeline& _timeline;
 
-       pl->Changed.connect (bind (&Timeline::playlist_changed, this));
-       pl->ContentChanged.connect (bind (&Timeline::playlist_changed, this));
-}
+private:
+       dcpomatic::Rect<int> _last_paint_bbox;
+};
 
-template <class T>
-int
-plot_content_list (
-       list<shared_ptr<const T> > content, wxGraphicsContext* gc, int x, int y, double pixels_per_second, int track_height, wxString type, bool consecutive
-       )
+
+/** Parent class for views of pieces of content */
+class ContentView : public View
 {
-       Time t = 0;
-       for (typename list<shared_ptr<const T> >::iterator i = content.begin(); i != content.end(); ++i) {
-               Time const len = (*i)->temporal_length ();
+public:
+       ContentView (Timeline& tl, shared_ptr<Content> c)
+               : View (tl)
+               , _content (c)
+               , _track (0)
+               , _selected (false)
+       {
+               _content_connection = c->Changed.connect (bind (&ContentView::content_changed, this, _2, _3));
+       }
+
+       dcpomatic::Rect<int> bbox () const
+       {
+               shared_ptr<const Film> film = _timeline.film ();
+               shared_ptr<const Content> content = _content.lock ();
+               if (!film || !content) {
+                       return dcpomatic::Rect<int> ();
+               }
+               
+               return dcpomatic::Rect<int> (
+                       time_x (content->position ()) - 8,
+                       y_pos (_track) - 8,
+                       content->length_after_trim().seconds() * _timeline.pixels_per_second() + 16,
+                       _timeline.track_height() + 16
+                       );
+       }
+
+       void set_selected (bool s) {
+               _selected = s;
+               force_redraw ();
+       }
+       
+       bool selected () const {
+               return _selected;
+       }
+
+       shared_ptr<Content> content () const {
+               return _content.lock ();
+       }
+
+       void set_track (int t) {
+               _track = t;
+       }
+
+       int track () const {
+               return _track;
+       }
+
+       virtual wxString type () const = 0;
+       virtual wxColour colour () const = 0;
+       
+private:
+
+       void do_paint (wxGraphicsContext* gc)
+       {
+               shared_ptr<const Film> film = _timeline.film ();
+               shared_ptr<const Content> cont = content ();
+               if (!film || !cont) {
+                       return;
+               }
+
+               DCPTime const position = cont->position ();
+               DCPTime const len = cont->length_after_trim ();
+
+               wxColour selected (colour().Red() / 2, colour().Green() / 2, colour().Blue() / 2);
+
+               gc->SetPen (*wxBLACK_PEN);
+               
+               gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (0, 0, 0), 4, wxPENSTYLE_SOLID));
+               if (_selected) {
+                       gc->SetBrush (*wxTheBrushList->FindOrCreateBrush (selected, wxBRUSHSTYLE_SOLID));
+               } else {
+                       gc->SetBrush (*wxTheBrushList->FindOrCreateBrush (colour(), wxBRUSHSTYLE_SOLID));
+               }
+
                wxGraphicsPath path = gc->CreatePath ();
-               path.MoveToPoint (x + t * pixels_per_second, y);
-               path.AddLineToPoint (x + (t + len) * pixels_per_second, y);
-               path.AddLineToPoint (x + (t + len) * pixels_per_second, y + track_height);
-               path.AddLineToPoint (x + t * pixels_per_second, y + track_height);
-               path.AddLineToPoint (x + t * pixels_per_second, y);
+               path.MoveToPoint    (time_x (position),       y_pos (_track) + 4);
+               path.AddLineToPoint (time_x (position + len), y_pos (_track) + 4);
+               path.AddLineToPoint (time_x (position + len), y_pos (_track + 1) - 4);
+               path.AddLineToPoint (time_x (position),       y_pos (_track + 1) - 4);
+               path.AddLineToPoint (time_x (position),       y_pos (_track) + 4);
                gc->StrokePath (path);
                gc->FillPath (path);
 
-               wxString name = wxString::Format ("%s [%s]", std_to_wx ((*i)->file().filename().string()), type);
+               wxString name = wxString::Format (wxT ("%s [%s]"), std_to_wx (cont->path_summary()).data(), type().data());
                wxDouble name_width;
                wxDouble name_height;
                wxDouble name_descent;
                wxDouble name_leading;
                gc->GetTextExtent (name, &name_width, &name_height, &name_descent, &name_leading);
                
-               gc->Clip (wxRegion (x + t * pixels_per_second, y, len * pixels_per_second, track_height));
-               gc->DrawText (name, t * pixels_per_second + 12, y + track_height - name_height - 4);
+               gc->Clip (wxRegion (time_x (position), y_pos (_track), len.seconds() * _timeline.pixels_per_second(), _timeline.track_height()));
+               gc->DrawText (name, time_x (position) + 12, y_pos (_track + 1) - name_height - 4);
                gc->ResetClip ();
+       }
+
+       int y_pos (int t) const
+       {
+               return _timeline.tracks_position().y + t * _timeline.track_height();
+       }
+
+       void content_changed (int p, bool frequent)
+       {
+               ensure_ui_thread ();
+               
+               if (p == ContentProperty::POSITION || p == ContentProperty::LENGTH) {
+                       force_redraw ();
+               }
 
-               if (consecutive) {
-                       t += len;
+               if (!frequent) {
+                       _timeline.setup_pixels_per_second ();
+                       _timeline.Refresh ();
+               }
+       }
+
+       boost::weak_ptr<Content> _content;
+       int _track;
+       bool _selected;
+
+       boost::signals2::scoped_connection _content_connection;
+};
+
+class AudioContentView : public ContentView
+{
+public:
+       AudioContentView (Timeline& tl, shared_ptr<Content> c)
+               : ContentView (tl, c)
+       {}
+       
+private:
+       wxString type () const
+       {
+               return _("audio");
+       }
+
+       wxColour colour () const
+       {
+               return wxColour (149, 121, 232, 255);
+       }
+};
+
+class VideoContentView : public ContentView
+{
+public:
+       VideoContentView (Timeline& tl, shared_ptr<Content> c)
+               : ContentView (tl, c)
+       {}
+
+private:       
+
+       wxString type () const
+       {
+               if (dynamic_pointer_cast<FFmpegContent> (content ())) {
+                       return _("video");
                } else {
-                       y += track_height;
+                       return _("still");
                }
        }
 
-       if (consecutive) {
-               y += track_height;
+       wxColour colour () const
+       {
+               return wxColour (242, 92, 120, 255);
        }
+};
 
-       return y;
+class SubtitleContentView : public ContentView
+{
+public:
+       SubtitleContentView (Timeline& tl, shared_ptr<Content> c)
+               : ContentView (tl, c)
+       {}
+
+private:
+       wxString type () const
+       {
+               return _("subtitles");
+       }
+
+       wxColour colour () const
+       {
+               return wxColour (163, 255, 154, 255);
+       }
+};
+
+class TimeAxisView : public View
+{
+public:
+       TimeAxisView (Timeline& tl, int y)
+               : View (tl)
+               , _y (y)
+       {}
+       
+       dcpomatic::Rect<int> bbox () const
+       {
+               return dcpomatic::Rect<int> (0, _y - 4, _timeline.width(), 24);
+       }
+
+       void set_y (int y)
+       {
+               _y = y;
+               force_redraw ();
+       }
+
+private:       
+
+       void do_paint (wxGraphicsContext* gc)
+       {
+               gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (0, 0, 0), 1, wxPENSTYLE_SOLID));
+               
+               double mark_interval = rint (128 / _timeline.pixels_per_second ());
+               if (mark_interval > 5) {
+                       mark_interval -= int (rint (mark_interval)) % 5;
+               }
+               if (mark_interval > 10) {
+                       mark_interval -= int (rint (mark_interval)) % 10;
+               }
+               if (mark_interval > 60) {
+                       mark_interval -= int (rint (mark_interval)) % 60;
+               }
+               if (mark_interval > 3600) {
+                       mark_interval -= int (rint (mark_interval)) % 3600;
+               }
+               
+               if (mark_interval < 1) {
+                       mark_interval = 1;
+               }
+
+               wxGraphicsPath path = gc->CreatePath ();
+               path.MoveToPoint (_timeline.x_offset(), _y);
+               path.AddLineToPoint (_timeline.width(), _y);
+               gc->StrokePath (path);
+
+               /* Time in seconds */
+               DCPTime t;
+               while ((t.seconds() * _timeline.pixels_per_second()) < _timeline.width()) {
+                       wxGraphicsPath path = gc->CreatePath ();
+                       path.MoveToPoint (time_x (t), _y - 4);
+                       path.AddLineToPoint (time_x (t), _y + 4);
+                       gc->StrokePath (path);
+
+                       double tc = t.seconds ();
+                       int const h = tc / 3600;
+                       tc -= h * 3600;
+                       int const m = tc / 60;
+                       tc -= m * 60;
+                       int const s = tc;
+                       
+                       wxString str = wxString::Format (wxT ("%02d:%02d:%02d"), h, m, s);
+                       wxDouble str_width;
+                       wxDouble str_height;
+                       wxDouble str_descent;
+                       wxDouble str_leading;
+                       gc->GetTextExtent (str, &str_width, &str_height, &str_descent, &str_leading);
+                       
+                       int const tx = _timeline.x_offset() + t.seconds() * _timeline.pixels_per_second();
+                       if ((tx + str_width) < _timeline.width()) {
+                               gc->DrawText (str, time_x (t), _y + 16);
+                       }
+                       
+                       t += DCPTime::from_seconds (mark_interval);
+               }
+       }
+
+private:
+       int _y;
+};
+
+
+Timeline::Timeline (wxWindow* parent, FilmEditor* ed, shared_ptr<Film> film)
+       : wxPanel (parent, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxFULL_REPAINT_ON_RESIZE)
+       , _film_editor (ed)
+       , _film (film)
+       , _time_axis_view (new TimeAxisView (*this, 32))
+       , _tracks (0)
+       , _pixels_per_second (0)
+       , _left_down (false)
+       , _down_view_position (0)
+       , _first_move (false)
+       , _menu (this)
+       , _snap (true)
+{
+#ifndef __WXOSX__
+       SetDoubleBuffered (true);
+#endif 
+
+       Bind (wxEVT_PAINT,      boost::bind (&Timeline::paint,       this));
+       Bind (wxEVT_LEFT_DOWN,  boost::bind (&Timeline::left_down,   this, _1));
+       Bind (wxEVT_LEFT_UP,    boost::bind (&Timeline::left_up,     this, _1));
+       Bind (wxEVT_RIGHT_DOWN, boost::bind (&Timeline::right_down,  this, _1));
+       Bind (wxEVT_MOTION,     boost::bind (&Timeline::mouse_moved, this, _1));
+       Bind (wxEVT_SIZE,       boost::bind (&Timeline::resized,     this));
+
+       playlist_changed ();
+
+       SetMinSize (wxSize (640, tracks() * track_height() + 96));
+
+       _playlist_connection = film->playlist()->Changed.connect (bind (&Timeline::playlist_changed, this));
 }
 
 void
-Timeline::paint (wxPaintEvent &)
+Timeline::paint ()
 {
        wxPaintDC dc (this);
 
-       shared_ptr<Playlist> pl = _playlist.lock ();
-       if (!pl) {
+       wxGraphicsContext* gc = wxGraphicsContext::Create (dc);
+       if (!gc) {
                return;
        }
 
-       wxGraphicsContext* gc = wxGraphicsContext::Create (dc);
-       if (!gc) {
+       gc->SetFont (gc->CreateFont (*wxNORMAL_FONT));
+
+       for (ViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
+               (*i)->paint (gc);
+       }
+
+       delete gc;
+}
+
+void
+Timeline::playlist_changed ()
+{
+       ensure_ui_thread ();
+       
+       shared_ptr<const Film> fl = _film.lock ();
+       if (!fl) {
                return;
        }
 
-       int const x_offset = 8;
-       int y = 8;
-       int const width = GetSize().GetWidth();
-       double const pixels_per_second = (width - x_offset * 2) / (pl->content_length() / pl->video_frame_rate());
+       _views.clear ();
+       _views.push_back (_time_axis_view);
 
-       gc->SetFont (gc->CreateFont (*wxNORMAL_FONT));
+       ContentList content = fl->playlist()->content ();
 
-       gc->SetPen (*wxBLACK_PEN);
-#if wxMAJOR_VERSION == 2 && wxMINOR_VERSION >= 9
-       gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (0, 0, 0), 4, wxPENSTYLE_SOLID));
-       gc->SetBrush (*wxTheBrushList->FindOrCreateBrush (wxColour (149, 121, 232, 255), wxBRUSHSTYLE_SOLID));
-#else                  
-       gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (0, 0, 0), 4, SOLID));
-       gc->SetBrush (*wxTheBrushList->FindOrCreateBrush (wxColour (149, 121, 232, 255), SOLID));
-#endif
-       y = plot_content_list (pl->video (), gc, x_offset, y, pixels_per_second, _track_height, _("video"), true);
-       
-#if wxMAJOR_VERSION == 2 && wxMINOR_VERSION >= 9
-       gc->SetBrush (*wxTheBrushList->FindOrCreateBrush (wxColour (242, 92, 120, 255), wxBRUSHSTYLE_SOLID));
-#else                  
-       gc->SetBrush (*wxTheBrushList->FindOrCreateBrush (wxColour (242, 92, 120, 255), SOLID));
-#endif
-       y = plot_content_list (pl->audio (), gc, x_offset, y, pixels_per_second, _track_height, _("audio"), pl->audio_from() == Playlist::AUDIO_FFMPEG);
-
-       /* Time axis */
-
-#if wxMAJOR_VERSION == 2 && wxMINOR_VERSION >= 9
-        gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (0, 0, 0), 1, wxPENSTYLE_SOLID));
-#else              
-       gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (0, 0, 0), 1, SOLID));
-#endif             
-                   
-       int mark_interval = rint (128 / pixels_per_second);
-        if (mark_interval > 5) {
-               mark_interval -= mark_interval % 5;
-       }
-        if (mark_interval > 10) {
-               mark_interval -= mark_interval % 10;
-       }
-       if (mark_interval > 60) {
-               mark_interval -= mark_interval % 60;
-       }
-       if (mark_interval > 3600) {
-               mark_interval -= mark_interval % 3600;
-       }
-
-        if (mark_interval < 1) {
-               mark_interval = 1;
-        }
-
-       wxGraphicsPath path = gc->CreatePath ();
-       path.MoveToPoint (x_offset, y + 40);
-       path.AddLineToPoint (width, y + 40);
-       gc->StrokePath (path);
-
-       double t = 0;
-       while ((t * pixels_per_second) < width) {
-               wxGraphicsPath path = gc->CreatePath ();
-               path.MoveToPoint (x_offset + t * pixels_per_second, y + 36);
-               path.AddLineToPoint (x_offset + t * pixels_per_second, y + 44);
-               gc->StrokePath (path);
+       for (ContentList::iterator i = content.begin(); i != content.end(); ++i) {
+               if (dynamic_pointer_cast<VideoContent> (*i)) {
+                       _views.push_back (shared_ptr<View> (new VideoContentView (*this, *i)));
+               }
+               if (dynamic_pointer_cast<AudioContent> (*i)) {
+                       _views.push_back (shared_ptr<View> (new AudioContentView (*this, *i)));
+               }
+               if (dynamic_pointer_cast<SubtitleContent> (*i)) {
+                       _views.push_back (shared_ptr<View> (new SubtitleContentView (*this, *i)));
+               }
+       }
+
+       assign_tracks ();
+       setup_pixels_per_second ();
+       Refresh ();
+}
+
+void
+Timeline::assign_tracks ()
+{
+       list<shared_ptr<VideoContentView> > video;
+       list<shared_ptr<AudioContentView> > audio;
+       list<shared_ptr<SubtitleContentView> > subtitle;
+
+       for (ViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
+               shared_ptr<VideoContentView> v = dynamic_pointer_cast<VideoContentView> (*i);
+               if (v) {
+                       video.push_back (v);
+               }
+               
+               shared_ptr<AudioContentView> a = dynamic_pointer_cast<AudioContentView> (*i);
+               if (a) {
+                       audio.push_back (a);
+               }
+
+               shared_ptr<SubtitleContentView> s = dynamic_pointer_cast<SubtitleContentView> (*i);
+               if (s) {
+                       subtitle.push_back (s);
+               }
+       }
+
+       _tracks = 0;
+       if (!video.empty ()) {
+               for (list<shared_ptr<VideoContentView> >::iterator i = video.begin(); i != video.end(); ++i) {
+                       (*i)->set_track (_tracks);
+               }
+               ++_tracks;
+       }
+       
+       if (!subtitle.empty ()) {
+               for (list<shared_ptr<SubtitleContentView> >::iterator i = subtitle.begin(); i != subtitle.end(); ++i) {
+                       (*i)->set_track (_tracks);
+               }
+               ++_tracks;
+       }
 
-               int tc = t;
-               int const h = tc / 3600;
-               tc -= h * 3600;
-               int const m = tc / 60;
-               tc -= m * 60;
-               int const s = tc;
+       int const audio_start = _tracks;
 
-               wxString str = wxString::Format ("%02d:%02d:%02d", h, m, s);
-               wxDouble str_width;
-               wxDouble str_height;
-               wxDouble str_descent;
-               wxDouble str_leading;
-               gc->GetTextExtent (str, &str_width, &str_height, &str_descent, &str_leading);
+       for (list<shared_ptr<AudioContentView> >::iterator i = audio.begin(); i != audio.end(); ++i) {
+               shared_ptr<Content> acv_content = (*i)->content();
 
-               int const tx = x_offset + t * pixels_per_second;
-               if ((tx + str_width) < width) {
-                       gc->DrawText (str, x_offset + t * pixels_per_second, y + 60);
+               int t = audio_start;
+               while (1) {
+                       list<shared_ptr<AudioContentView> >::iterator j = audio.begin ();
+                       while (j != audio.end()) {
+                               if ((*j)->track() == t) {
+                                       bool const no_overlap =
+                                               (acv_content->position() < (*j)->content()->position() && acv_content->end() < (*j)->content()->position()) ||
+                                               (acv_content->position() > (*j)->content()->end()      && acv_content->end() > (*j)->content()->end());
+                                       
+                                       if (!no_overlap) {
+                                               /* we have an overlap on track `t' */
+                                               ++t;
+                                               break;
+                                       }
+                               }
+                               
+                               ++j;
+                       }
+
+                       if (j == audio.end ()) {
+                               /* no overlap on `t' */
+                               break;
+                       }
                }
-               t += mark_interval;
+
+               (*i)->set_track (t);
+               _tracks = max (_tracks, t + 1);
        }
 
-       delete gc;
+       _time_axis_view->set_y (tracks() * track_height() + 32);
+}
+
+int
+Timeline::tracks () const
+{
+       return _tracks;
 }
 
 void
-Timeline::playlist_changed ()
+Timeline::setup_pixels_per_second ()
 {
-       Refresh ();
+       shared_ptr<const Film> film = _film.lock ();
+       if (!film || film->length() == DCPTime ()) {
+               return;
+       }
+
+       _pixels_per_second = static_cast<double>(width() - x_offset() * 2) / film->length().seconds ();
+}
+
+shared_ptr<View>
+Timeline::event_to_view (wxMouseEvent& ev)
+{
+       ViewList::iterator i = _views.begin();
+       Position<int> const p (ev.GetX(), ev.GetY());
+       while (i != _views.end() && !(*i)->bbox().contains (p)) {
+               ++i;
+       }
+
+       if (i == _views.end ()) {
+               return shared_ptr<View> ();
+       }
+
+       return *i;
+}
+
+void
+Timeline::left_down (wxMouseEvent& ev)
+{
+       shared_ptr<View> view = event_to_view (ev);
+       shared_ptr<ContentView> content_view = dynamic_pointer_cast<ContentView> (view);
+
+       _down_view.reset ();
+
+       if (content_view) {
+               _down_view = content_view;
+               _down_view_position = content_view->content()->position ();
+       }
+
+       for (ViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
+               shared_ptr<ContentView> cv = dynamic_pointer_cast<ContentView> (*i);
+               if (!cv) {
+                       continue;
+               }
+               
+               if (!ev.ShiftDown ()) {
+                       cv->set_selected (view == *i);
+               }
+               
+               if (view == *i) {
+                       _film_editor->set_selection (cv->content ());
+               }
+       }
+
+       if (content_view && ev.ShiftDown ()) {
+               content_view->set_selected (!content_view->selected ());
+       }
+
+       _left_down = true;
+       _down_point = ev.GetPosition ();
+       _first_move = false;
+
+       if (_down_view) {
+               _down_view->content()->set_change_signals_frequent (true);
+       }
+}
+
+void
+Timeline::left_up (wxMouseEvent& ev)
+{
+       _left_down = false;
+
+       if (_down_view) {
+               _down_view->content()->set_change_signals_frequent (false);
+       }
+
+       set_position_from_event (ev);
+}
+
+void
+Timeline::mouse_moved (wxMouseEvent& ev)
+{
+       if (!_left_down) {
+               return;
+       }
+
+       set_position_from_event (ev);
+}
+
+void
+Timeline::right_down (wxMouseEvent& ev)
+{
+       shared_ptr<View> view = event_to_view (ev);
+       shared_ptr<ContentView> cv = dynamic_pointer_cast<ContentView> (view);
+       if (!cv) {
+               return;
+       }
+
+       if (!cv->selected ()) {
+               clear_selection ();
+               cv->set_selected (true);
+       }
+
+       _menu.popup (_film, selected_content (), ev.GetPosition ());
+}
+
+void
+Timeline::set_position_from_event (wxMouseEvent& ev)
+{
+       wxPoint const p = ev.GetPosition();
+
+       if (!_first_move) {
+               /* We haven't moved yet; in that case, we must move the mouse some reasonable distance
+                  before the drag is considered to have started.
+               */
+               int const dist = sqrt (pow (p.x - _down_point.x, 2) + pow (p.y - _down_point.y, 2));
+               if (dist < 8) {
+                       return;
+               }
+               _first_move = true;
+       }
+
+       if (!_down_view) {
+               return;
+       }
+       
+       DCPTime new_position = _down_view_position + DCPTime::from_seconds ((p.x - _down_point.x) / _pixels_per_second);
+       
+       if (_snap) {
+               
+               bool first = true;
+               DCPTime nearest_distance = DCPTime::max ();
+               DCPTime nearest_new_position = DCPTime::max ();
+               
+               /* Find the nearest content edge; this is inefficient */
+               for (ViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
+                       shared_ptr<ContentView> cv = dynamic_pointer_cast<ContentView> (*i);
+                       if (!cv || cv == _down_view) {
+                               continue;
+                       }
+                       
+                       {
+                               /* Snap starts to ends */
+                               DCPTime const d = DCPTime (cv->content()->end() - new_position).abs ();
+                               if (first || d < nearest_distance) {
+                                       nearest_distance = d;
+                                       nearest_new_position = cv->content()->end();
+                               }
+                       }
+                       
+                       {
+                               /* Snap ends to starts */
+                               DCPTime const d = DCPTime (
+                                       cv->content()->position() - (new_position + _down_view->content()->length_after_trim())
+                                       ).abs ();
+                               
+                               if (d < nearest_distance) {
+                                       nearest_distance = d;
+                                       nearest_new_position = cv->content()->position() - _down_view->content()->length_after_trim ();
+                               }
+                       }
+                       
+                       first = false;
+               }
+               
+               if (!first) {
+                       /* Snap if it's close; `close' means within a proportion of the time on the timeline */
+                       if (nearest_distance < DCPTime::from_seconds ((width() / pixels_per_second()) / 32)) {
+                               new_position = nearest_new_position;
+                       }
+               }
+       }
+       
+       if (new_position < DCPTime ()) {
+               new_position = DCPTime ();
+       }
+       
+       _down_view->content()->set_position (new_position);
+       
+       shared_ptr<Film> film = _film.lock ();
+       assert (film);
+       film->set_sequence_video (false);
+}
+
+void
+Timeline::force_redraw (dcpomatic::Rect<int> const & r)
+{
+       RefreshRect (wxRect (r.x, r.y, r.width, r.height), false);
+}
+
+shared_ptr<const Film>
+Timeline::film () const
+{
+       return _film.lock ();
+}
+
+void
+Timeline::resized ()
+{
+       setup_pixels_per_second ();
+}
+
+void
+Timeline::clear_selection ()
+{
+       for (ViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
+               shared_ptr<ContentView> cv = dynamic_pointer_cast<ContentView> (*i);
+               if (cv) {
+                       cv->set_selected (false);
+               }
+       }
+}
+
+Timeline::ContentViewList
+Timeline::selected_views () const
+{
+       ContentViewList sel;
+       
+       for (ViewList::const_iterator i = _views.begin(); i != _views.end(); ++i) {
+               shared_ptr<ContentView> cv = dynamic_pointer_cast<ContentView> (*i);
+               if (cv && cv->selected()) {
+                       sel.push_back (cv);
+               }
+       }
+
+       return sel;
+}
+
+ContentList
+Timeline::selected_content () const
+{
+       ContentList sel;
+       ContentViewList views = selected_views ();
+       
+       for (ContentViewList::const_iterator i = views.begin(); i != views.end(); ++i) {
+               sel.push_back ((*i)->content ());
+       }
+
+       return sel;
 }