S splits a pattern at mouse cursor

cheatsheet.txt

@@ -118,6 +118,7 @@ Shift+Click+Drag: Move copy of pattern(s) at cursor.
      +Click+Drag: Move pattern link(s) at cursor.
           Delete: Remove selected patterns.
           Ctrl+J: Join patterns across tracks into one.
+               S: Split patterns at cursor.
           Ctrl+D: Duplicate selection.
     Ctrl+Shift+D: Duplicate selection as link.
 Shift+Left/Right: Move patterns along track (+-step).

model.cpp

@@ -262,6 +262,28 @@ void Pattern::copy_from(const Pattern &pattern) {
     }
 }
 
+void Pattern::move_frames(int row, int step, int channel) {
+    int length = get_length();
+    
+    Pattern::iterator iter;
+    for (Pattern::iterator iter = begin(); 
+         iter != end(); ++iter) {
+        int frame = iter->second.frame;
+        if (frame < row)
+            continue;
+        if ((channel >= 0) && (iter->second.channel != channel))
+            continue;
+        int newframe = frame + step;
+        if ((newframe < row) || (newframe >= length)) {
+            iter->second.frame = -1; // will be deleted
+        } else {
+            iter->second.frame = newframe;
+        }
+    }
+    
+    update_keys();    
+}
+
 //=============================================================================
 
 SongEvent::SongEvent() {

model.hpp

@@ -160,6 +160,8 @@ public:
     void update_keys();
     void copy_from(const Pattern &pattern);
     
+    void move_frames(int row, int step, int channel);
+    
     Pattern();
 protected:
     // length in frames

patternview.cpp

@@ -1212,25 +1212,9 @@ void PatternView::transpose(int step) {
 void PatternView::move_frames(int step, bool all_channels/*=false*/) {
     int row = cursor.get_row();
     int channel = cursor.get_channel();
-    int length = get_pattern()->get_length();
     
-    Pattern::iterator iter;
-    for (Pattern::iterator iter = get_pattern()->begin(); 
-         iter != get_pattern()->end(); ++iter) {
-        int frame = iter->second.frame;
-        if (frame < row)
-            continue;
-        if (!all_channels && (iter->second.channel != channel))
-            continue;
-        int newframe = frame + step;
-        if ((newframe < row) || (newframe >= length)) {
-            iter->second.frame = -1; // will be deleted
-        } else {
-            iter->second.frame = newframe;
-        }
-    }
+    get_pattern()->move_frames(row, step, (all_channels?-1:channel));
     
-    get_pattern()->update_keys();
     invalidate();
 }
 

songview.cpp

@@ -907,6 +907,44 @@ void SongView::set_loop_end() {
     invalidate_loop();
 }
 
+void SongView::split_at_mouse_cursor() {
+    SongCursor cur(*this);
+    cur.set_pos(cursor_x, cursor_y);
+    
+    int frame = quantize_frame(cur.get_frame());
+    
+    invalidate_selection();
+    Song::IterList new_selection;
+    
+    Song::IterList::iterator iter;
+    for (iter = selection.begin(); iter != selection.end(); ++iter) {
+        Song::Event &event = (*iter)->second;
+        if ((frame > event.frame) && (frame < event.get_last_frame())) {
+            // create two new events
+            Song::Event left_event = event;
+            Song::Event right_event = event;
+            left_event.pattern = &model->new_pattern(event.pattern);
+            left_event.pattern->set_length(frame - event.frame);
+            right_event.pattern = &model->new_pattern(event.pattern);
+            right_event.pattern->move_frames(0, event.frame - frame, -1);
+            right_event.pattern->set_length(event.get_end() - frame);
+            right_event.frame = frame;
+            
+            new_selection.push_back(model->song.add_event(left_event));
+            new_selection.push_back(model->song.add_event(right_event));
+            
+            _pattern_erased(*iter);
+            model->song.erase(*iter);
+        }
+    }
+    
+    selection = new_selection;
+    invalidate_selection();    
+    
+    // cleanup
+    model->delete_unused_patterns();    
+}
+
 void SongView::seek_to_mouse_cursor() {
     SongCursor cur(*this);
     cur.set_pos(cursor_x, cursor_y);
@@ -1003,6 +1041,7 @@ bool SongView::on_key_press_event(GdkEventKey* event) {
                     edit_pattern(selection.front());
                 return true;
             } break;
+            case GDK_s: split_at_mouse_cursor(); return true;
             case GDK_p: seek_to_mouse_cursor(); return true;
             case GDK_m: toggle_mute_selection(); return true;
             case GDK_Left: navigate(-1,0); return true;

songview.hpp

@@ -161,6 +161,7 @@ protected:
     int get_selection_end();
     void play_from_selection();
     void seek_to_mouse_cursor();
+    void split_at_mouse_cursor();
 
     bool can_resize_event(Song::iterator event, int x);
     void get_drag_offset(int &frame, int &track);