timeline/various: implemented block copy/paste

Implemented the ability to copy/paste blocks/clips in the timeline. This did
require some large scale changes and reworking of the copy/paste system
introduced a few commits ago, but should be largely functional now.

app/common/xmlutils.cpp

@@ -1,16 +1,17 @@
 #include "xmlutils.h"
 
 #include "node/factory.h"
+#include "widget/nodeview/nodeviewundo.h"
 
 Node* XMLLoadNode(QXmlStreamReader* reader) {
   QString node_id;
+  quintptr node_ptr = 0;
 
   XMLAttributeLoop(reader, attr) {
-    if (attr.name() == "id") {
+    if (attr.name() == QStringLiteral("id")) {
       node_id = attr.value().toString();
-
-      // Currently the only thing we need
-      break;
+    } else if (attr.name() == QStringLiteral("ptr")) {
+      node_ptr = attr.value().toULongLong();
     }
   }
 
@@ -21,20 +22,26 @@ Node* XMLLoadNode(QXmlStreamReader* reader) {
 
   Node* node = NodeFactory::CreateFromID(node_id);
 
-  if (!node) {
+  if (node) {
+    node->setProperty("xml_ptr", node_ptr);
+  } else {
     qWarning() << "Failed to load" << node_id << "- no node with that ID is installed";
   }
 
   return node;
 }
 
-void XMLConnectNodes(const QHash<quintptr, NodeOutput*>& output_ptrs, const QList<NodeParam::SerializedConnection>& desired_connections)
+void XMLConnectNodes(const QHash<quintptr, NodeOutput*>& output_ptrs, const QList<XMLNodeData::SerializedConnection>& desired_connections, QUndoCommand *command)
 {
-  foreach (const NodeParam::SerializedConnection& con, desired_connections) {
+  foreach (const XMLNodeData::SerializedConnection& con, desired_connections) {
     NodeOutput* out = output_ptrs.value(con.output);
 
     if (out) {
-      NodeParam::ConnectEdge(out, con.input);
+      if (command) {
+        new NodeEdgeAddCommand(out, con.input, command);
+      } else {
+        NodeParam::ConnectEdge(out, con.input);
+      }
     }
   }
 }

app/common/xmlutils.h

@@ -1,9 +1,15 @@
 #ifndef XMLREADLOOP_H
 #define XMLREADLOOP_H
 
+#include <QUndoCommand>
 #include <QXmlStreamReader>
 
-#include "node/node.h"
+class Node;
+class NodeParam;
+class NodeInput;
+class NodeOutput;
+
+#include "project/item/footage/stream.h"
 
 #define XMLAttributeLoop(reader, item) \
   QXmlStreamAttributes __attributes = reader->attributes(); \
@@ -11,7 +17,24 @@
 
 Node *XMLLoadNode(QXmlStreamReader* reader);
 
-void XMLConnectNodes(const QHash<quintptr, NodeOutput *> &output_ptrs, const QList<NodeParam::SerializedConnection> &desired_connections);
+struct XMLNodeData {
+  struct SerializedConnection {
+    NodeInput* input;
+    quintptr output;
+  };
+
+  struct FootageConnection {
+    NodeInput* input;
+    quintptr footage;
+  };
+
+  QHash<quintptr, NodeOutput*> output_ptrs;
+  QList<SerializedConnection> desired_connections;
+  QHash<quintptr, StreamPtr> footage_ptrs;
+  QList<FootageConnection> footage_connections;
+};
+
+void XMLConnectNodes(const QHash<quintptr, NodeOutput *> &output_ptrs, const QList<XMLNodeData::SerializedConnection> &desired_connections, QUndoCommand* command = nullptr);
 
 bool XMLReadNextStartElement(QXmlStreamReader* reader);