[ui][commands] add MoveNodeCommand

add undoable command to move a Node to a target position

meshroom/ui/commands.py

@@ -258,6 +258,23 @@ class ListAttributeRemoveCommand(GraphCommand):
         listAttribute.insert(self.index, self.value)
 
 
+class MoveNodeCommand(GraphCommand):
+    """ Move a node to a given position. """
+    def __init__(self, graph, node, position, parent=None):
+        super(MoveNodeCommand, self).__init__(graph, parent)
+        self.nodeName = node.name
+        self.oldPosition = node.position
+        self.newPosition = position
+        self.setText("Move {}".format(self.nodeName))
+
+    def redoImpl(self):
+        self.graph.node(self.nodeName).position = self.newPosition
+        return True
+
+    def undoImpl(self):
+        self.graph.node(self.nodeName).position = self.oldPosition
+
+
 class UpgradeNodeCommand(GraphCommand):
     """
     Perform node upgrade on a CompatibilityNode.

meshroom/ui/graph.py

@@ -252,6 +252,19 @@ class UIGraph(QObject):
         """
         return self.push(commands.AddNodeCommand(self._graph, nodeType, **kwargs))
 
+    @Slot(Node, QPoint)
+    def moveNode(self, node, position):
+        """
+        Move 'node' to the given 'position'.
+
+        Args:
+            node (Node): the node to move
+            position (QPoint): the target position
+        """
+        if isinstance(position, QPoint):
+            position = Position(position.x(), position.y())
+        self.push(commands.MoveNodeCommand(self._graph, node, position))
+
     @Slot(Node)
     def removeNode(self, node):
         self.push(commands.RemoveNodeCommand(self._graph, node))