Add Delete functionality. Still buggy.

app/project/projectviewmodel.cpp

@@ -26,6 +26,7 @@
 
 #include "core.h"
 #include "node/input/media/media.h"
+#include "widget/timelinewidget/timelinewidget.h"
 
 OLIVE_NAMESPACE_ENTER
 
@@ -641,4 +642,36 @@ void ProjectViewModel::OfflineFootageCommand::undo_internal()
   }
 }
 
+ProjectViewModel::DeleteFootageCommand::DeleteFootageCommand(ProjectViewModel* model, ItemPtr item,
+  QList<Block*> blocks, QUndoCommand* parent) :
+  UndoCommand(parent),
+  model_(model),
+  item_(item),
+  blocks_(blocks) 
+{
+  deleteCommand_ = new QUndoCommand();
+  removalCommand_ = new QUndoCommand();
+}
+
+Project *ProjectViewModel::DeleteFootageCommand::GetRelevantProject() const
+{
+  return model_->project();
+}
+
+void ProjectViewModel::DeleteFootageCommand::redo_internal()
+{
+  TimelineWidget::ReplaceBlocksWithGaps(blocks_, true, deleteCommand_);
+  Core::instance()->undo_stack()->pushIfHasChildren(deleteCommand_);
+
+  new ProjectViewModel::RemoveItemCommand(model_, item_, removalCommand_);
+  Core::instance()->undo_stack()->pushIfHasChildren(removalCommand_);
+}
+
+void ProjectViewModel::DeleteFootageCommand::undo_internal()
+{
+  removalCommand_->undo();
+  deleteCommand_->undo();
+}
+
+
 OLIVE_NAMESPACE_EXIT

app/project/projectviewmodel.h

@@ -25,6 +25,7 @@
 
 #include "project.h"
 #include "undo/undocommand.h"
+#include "node/block/block.h"
 
 OLIVE_NAMESPACE_ENTER
 
@@ -215,6 +216,29 @@ public:
     QMap<Node*, StreamPtr> nodes_;
   };
 
+  class DeleteFootageCommand : public UndoCommand {
+  public:
+    DeleteFootageCommand(ProjectViewModel* model, ItemPtr item, QList<Block*> blocks, QUndoCommand* parent = nullptr);
+
+    virtual Project* GetRelevantProject() const override;
+
+  protected:
+    virtual void redo_internal() override;
+
+    virtual void undo_internal() override;
+
+  private:
+    ProjectViewModel* model_;
+
+    ItemPtr item_;
+
+    QList<Block*> blocks_;
+
+    QUndoCommand* deleteCommand_;
+
+    QUndoCommand* removalCommand_;
+  };
+
 private:
   /**
    * @brief Retrieve the index of `item` in its parent