1 files changed, 99 insertions, 0 deletions
diff --git a/dgbuilder/public/red/history.js b/dgbuilder/public/red/history.js
new file mode 100644
index 00000000..3a6d5513
--- /dev/null
+++ b/dgbuilder/public/red/history.js
@@ -0,0 +1,99 @@
+/**
+ * Copyright 2013 IBM Corp.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ **/
+RED.history = (function() {
+    var undo_history = [];
+    
+    return {
+        //TODO: this function is a placeholder until there is a 'save' event that can be listened to
+        markAllDirty: function() {
+            for (var i=0;i<undo_history.length;i++) {
+                undo_history[i].dirty = true;
+            }
+        },
+        depth: function() {
+            return undo_history.length;
+        },
+        push: function(ev) {
+            undo_history.push(ev);
+        },
+        pop: function() {
+            var ev = undo_history.pop();
+            var i;
+            if (ev) {
+                if (ev.t == 'add') {
+                    if (ev.nodes) {
+                        for (i=0;i<ev.nodes.length;i++) {
+                            RED.nodes.remove(ev.nodes[i]);
+                        }
+                    }
+                    if (ev.links) {
+                        for (i=0;i<ev.links.length;i++) {
+                            RED.nodes.removeLink(ev.links[i]);
+                        }
+                    }
+                    if (ev.workspaces) {
+                        for (i=0;i<ev.workspaces.length;i++) {
+                            RED.nodes.removeWorkspace(ev.workspaces[i].id);
+                            RED.view.removeWorkspace(ev.workspaces[i]);
+                        }
+                    }
+                } else if (ev.t == "delete") {
+                    if (ev.workspaces) {
+                        for (i=0;i<ev.workspaces.length;i++) {
+                            RED.nodes.addWorkspace(ev.workspaces[i]);
+                            RED.view.addWorkspace(ev.workspaces[i]);
+                        }
+                    }
+                    if (ev.nodes) {
+                        for (i=0;i<ev.nodes.length;i++) {
+                            RED.nodes.add(ev.nodes[i]);
+                        }
+                    }
+                    if (ev.links) {
+                        for (i=0;i<ev.links.length;i++) {
+                            RED.nodes.addLink(ev.links[i]);
+                        }
+                    }
+                } else if (ev.t == "move") {
+                    for (i=0;i<ev.nodes.length;i++) {
+                        var n = ev.nodes[i];
+                        n.n.x = n.ox;
+                        n.n.y = n.oy;
+                        n.n.dirty = true;
+                    }
+                } else if (ev.t == "edit") {
+                    for (i in ev.changes) {
+                        if (ev.changes.hasOwnProperty(i)) {
+                            ev.node[i] = ev.changes[i];
+                        }
+                    }
+                    RED.editor.updateNodeProperties(ev.node);
+                    if (ev.links) {
+                        for (i=0;i<ev.links.length;i++) {
+                            RED.nodes.addLink(ev.links[i]);
+                        }
+                    }
+                    RED.editor.validateNode(ev.node);
+                    ev.node.dirty = true;
+                    ev.node.changed = ev.changed;
+                }
+                RED.view.dirty(ev.dirty);
+                RED.view.redraw();
+            }
+        }
+    }
+
+})();