From 08ce6c91fd37c904362a5ec6f054bcd3ee061b74 Mon Sep 17 00:00:00 2001
From: Aleks Kissinger <aleks0@gmail.com>
Date: Sat, 18 Apr 2020 15:09:39 +0100
Subject: fixed pasting for paths

---
 src/data/graph.cpp       | 26 +++++++++++++++++++++++++-
 src/gui/undocommands.cpp | 16 ++++++++++++++++
 2 files changed, 41 insertions(+), 1 deletion(-)

diff --git a/src/data/graph.cpp b/src/data/graph.cpp
index 979423e..74de24d 100644
--- a/src/data/graph.cpp
+++ b/src/data/graph.cpp
@@ -360,9 +360,33 @@ Graph *Graph::copyOfSubgraphWithNodes(QSet<Node *> nds)
             g->addNode(n1);
         }
     }
+
+    QMap<Edge*,Edge*> edgeTable;
     foreach (Edge *e, edges()) {
         if (nds.contains(e->source()) && nds.contains(e->target())) {
-            g->addEdge(e->copy(&nodeTable));
+            Edge *e1 = e->copy(&nodeTable);
+            g->addEdge(e1);
+            edgeTable.insert(e,e1);
+        }
+    }
+
+    // add a copy of a path to the new graph if all of the edges are there
+    foreach (Path *p, paths()) {
+        bool allEdges = true;
+        Path *p1 = new Path();
+        foreach (Edge *e1, p->edges()) {
+            if (edgeTable.contains(e1)) {
+                p1->addEdge(edgeTable[e1]);
+            } else {
+                allEdges = false;
+                break;
+            }
+        }
+        if (allEdges) {
+            g->addPath(p1);
+        } else {
+            p1->removeEdges();
+            delete p1;
         }
     }
 
diff --git a/src/gui/undocommands.cpp b/src/gui/undocommands.cpp
index 9771f44..3b1109e 100644
--- a/src/gui/undocommands.cpp
+++ b/src/gui/undocommands.cpp
@@ -381,6 +381,16 @@ void PasteCommand::undo()
 {
     _scene->clearSelection();
 
+    foreach (Path *p, _graph->paths()) {
+        PathItem *pi = _scene->pathItems()[p];
+        _scene->pathItems().remove(p);
+        _scene->removeItem(pi);
+        delete pi;
+
+        p->removeEdges();
+        _scene->graph()->removePath(p);
+    }
+
     foreach (Edge *e, _graph->edges()) {
         EdgeItem *ei = _scene->edgeItems()[e];
         _scene->edgeItems().remove(e);
@@ -411,6 +421,12 @@ void PasteCommand::redo()
     _scene->clearSelection();
     _scene->graph()->insertGraph(_graph);
 
+    foreach (Path *p, _graph->paths()) {
+        PathItem *pi = new PathItem(p);
+        _scene->pathItems().insert(p, pi);
+        _scene->addItem(pi);
+    }
+
     foreach (Edge *e, _graph->edges()) {
 		e->attachStyle(); // in case styles have changed
         EdgeItem *ei = new EdgeItem(e);
-- 
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