[ui] Paste a node on the mouse's position

When creating a node with a "paste" operation, place the node
on the mouse's position in the graph instead of default position (0,0).

If the mouse is placed on an existing node, the pasted node will be
placed on the mouse's position plus an offset so that the pasted node
does not directly overlap with the existing node.

meshroom/core/graph.py

@@ -396,11 +396,11 @@ class Graph(BaseObject):
 
         return duplicates
 
-    def pasteNode(self, nodeType, **kwargs):
+    def pasteNode(self, nodeType, position, **kwargs):
         name = self._createUniqueNodeName(nodeType)
         node = None
         with GraphModification(self):
-            node = Node(nodeType, **kwargs)
+            node = Node(nodeType, position=position, **kwargs)
             self._addNode(node, name)
             self._applyExpr()
         return node

meshroom/ui/commands.py

@@ -199,14 +199,15 @@ class PasteNodeCommand(GraphCommand):
     """
     Handle node pasting in a Graph.
     """
-    def __init__(self, graph, nodeType, parent=None, **kwargs):
+    def __init__(self, graph, nodeType, position=None, parent=None, **kwargs):
         super(PasteNodeCommand, self).__init__(graph, parent)
         self.nodeType = nodeType
+        self.position = position
         self.nodeName = None
         self.kwargs = kwargs
 
     def redoImpl(self):
-        node = self.graph.pasteNode(self.nodeType, **self.kwargs)
+        node = self.graph.pasteNode(self.nodeType, self.position, **self.kwargs)
         self.nodeName = node.name
         self.setText("Paste Node {}".format(self.nodeName))
         return node

meshroom/ui/graph.py

@@ -766,8 +766,8 @@ class UIGraph(QObject):
             return json.dumps(node, indent=4)
         return ''
 
-    @Slot(str)
-    def pasteNode(self, clipboardContent):
+    @Slot(str, QPoint)
+    def pasteNode(self, clipboardContent, position=None):
         """
         Parse the content of the clipboard to see whether it contains
         a valid node description. If that is the case, the node described
@@ -802,7 +802,10 @@ class UIGraph(QObject):
         attributes.update(d.get("inputs", {}))
         attributes.update(d.get("outputs", {}))
 
-        self.push(commands.PasteNodeCommand(self._graph, nodeType, **attributes))
+        if isinstance(position, QPoint):
+            position = Position(position.x(), position.y())
+
+        self.push(commands.PasteNodeCommand(self._graph, nodeType, position=position, **attributes))
 
     undoStack = Property(QObject, lambda self: self._undoStack, constant=True)
     graphChanged = Signal()

meshroom/ui/qml/GraphEditor/GraphEditor.qml

@@ -41,6 +41,7 @@ Item {
     clip: true
 
     SystemPalette { id: activePalette }
+    property point pastePosition
 
     /// Get node delegate for the given node object
     function nodeDelegate(node)
@@ -88,8 +89,9 @@ Item {
     /// Paste content of clipboard to graph editor and create new node if valid
     function pasteNode()
     {
+        root.pastePosition = mapToItem(draggable, mouseArea.mouseX, mouseArea.mouseY)
         var copiedContent = Clipboard.getText()
-        uigraph.pasteNode(copiedContent)
+        uigraph.pasteNode(copiedContent, root.pastePosition)
     }
 
     Keys.onPressed: {