rewrite nearly complete

ui/focusfilter.cpp

@@ -100,7 +100,7 @@ void FocusFilter::set_viewer_fullscreen() {
 }
 
 void FocusFilter::set_marker() {
-  if (olive::ActiveSequence != nullptr) {
+  if (Timeline::GetTopSequence() != nullptr) {
     QDockWidget* focused_panel = get_focused_panel();
 
     if (focused_panel == panel_footage_viewer) {
@@ -108,7 +108,7 @@ void FocusFilter::set_marker() {
     } else if (focused_panel == panel_sequence_viewer) {
       panel_sequence_viewer->set_marker();
     } else {
-      panel_timeline->set_marker();
+      panel_timeline.first()->set_marker();
     }
   }
 }
@@ -190,28 +190,31 @@ void FocusFilter::clear_inout() {
 }
 
 void FocusFilter::delete_function() {
-  if (panel_timeline->headers->hasFocus()) {
-    panel_timeline->headers->delete_markers();
+  if (panel_timeline.first()->headers->hasFocus()) {
+    panel_timeline.first()->headers->delete_markers();
   } else if (panel_footage_viewer->headers->hasFocus()) {
     panel_footage_viewer->headers->delete_markers();
   } else if (panel_sequence_viewer->headers->hasFocus()) {
     panel_sequence_viewer->headers->delete_markers();
-  } else if (panel_effect_controls->is_focused()) {
+  } else if (panel_effect_controls->focused()) {
     panel_effect_controls->DeleteSelectedEffects();
-  } else if (panel_project->is_focused()) {
-    panel_project->delete_selected_media();
-  } else if (panel_effect_controls->keyframe_focus()) {
+  } else if (panel_project.first()->focused()) {
+    panel_project.first()->delete_selected_media();
+  } else if (panel_effect_controls->focused()) {
     panel_effect_controls->delete_selected_keyframes();
-  } else if (panel_graph_editor->view_is_focused()) {
+  } else if (panel_graph_editor->focused()) {
     panel_graph_editor->delete_selected_keys();
   } else {
-    panel_timeline->delete_selection(olive::ActiveSequence->selections, false);
+    Sequence* top_sequence = Timeline::GetTopSequence().get();
+    ComboAction* ca = new ComboAction();
+    top_sequence->DeleteAreas(ca, top_sequence->Selections(), true);
+    olive::undo_stack.push(ca);
   }
 }
 
 void FocusFilter::duplicate() {
-  if (panel_project->is_focused()) {
-    panel_project->duplicate_selected();
+  if (panel_project.first()->focused()) {
+    panel_project.first()->duplicate_selected();
   }
 }
 
@@ -220,7 +223,7 @@ void FocusFilter::select_all() {
   if (focused_panel == panel_graph_editor) {
     panel_graph_editor->select_all();
   } else {
-    panel_timeline->select_all();
+    panel_timeline.first()->select_all();
   }
 }
 
@@ -233,7 +236,7 @@ void FocusFilter::zoom_in() {
   } else if (focused_panel == panel_sequence_viewer) {
     panel_sequence_viewer->set_zoom(true);
   } else {
-    panel_timeline->zoom_in();
+    panel_timeline.first()->zoom_in();
   }
 }
 
@@ -246,28 +249,28 @@ void FocusFilter::zoom_out() {
   } else if (focused_panel == panel_sequence_viewer) {
     panel_sequence_viewer->set_zoom(false);
   } else {
-    panel_timeline->zoom_out();
+    panel_timeline.first()->zoom_out();
   }
 }
 
 void FocusFilter::cut() {
-  if (olive::ActiveSequence != nullptr) {
+  if (Timeline::GetTopSequence() != nullptr) {
     QDockWidget* focused_panel = get_focused_panel();
     if (panel_effect_controls == focused_panel) {
       panel_effect_controls->copy(true);
     } else {
-      panel_timeline->copy(true);
+      panel_timeline.first()->copy(true);
     }
   }
 }
 
 void FocusFilter::copy() {
-  if (olive::ActiveSequence != nullptr) {
+  if (Timeline::GetTopSequence() != nullptr) {
     QDockWidget* focused_panel = get_focused_panel();
     if (panel_effect_controls == focused_panel) {
       panel_effect_controls->copy(false);
     } else {
-      panel_timeline->copy(false);
+      panel_timeline.first()->copy(false);
     }
   }
 }