/// <summary>
/// Fetches every Node Declaration in the script assemblies to provide the framework with custom node types
/// </summary>
public static void FetchNodeTypes()
{
nodes = new Dictionary <string, NodeTypeData> ();
foreach (Type type in ReflectionUtility.getSubTypes(typeof(Node)))
{
object[] nodeAttributes = type.GetCustomAttributes(typeof(NodeAttribute), false);
NodeAttribute attr = nodeAttributes[0] as NodeAttribute;
if (attr == null || !attr.hide)
{ // Only regard if it is not marked as hidden
// Fetch node information
string ID, Title = "None";
FieldInfo IDField = type.GetField("ID");
if (IDField == null || attr == null)
{ // Cannot read ID from const field or need to read Title because of missing attribute -> Create sample to read from properties
Node sample = (Node)ScriptableObject.CreateInstance(type);
ID = sample.GetName;
Title = sample.Title;
UnityEngine.Object.DestroyImmediate(sample);
}
else // Can read ID directly from const field
{
ID = (string)IDField.GetValue(null);
}
// Create Data from information
NodeTypeData data = attr == null? // Switch between explicit information by the attribute or node information
new NodeTypeData(ID, Title, type, new Type[0]) :
new NodeTypeData(ID, attr.contextText, type, attr.limitToCanvasTypes);
nodes.Add(ID, data);
}
}
}
/// <summary>
/// Creates a node of the specified ID at pos on the specified canvas, optionally auto-connecting the specified output to a matching input
/// silent disables any events, init specifies whether OnCreate should be called
/// </summary>
public static Node Create(string nodeID, Vector2 pos, NodeCanvas hostCanvas, ConnectionPort connectingPort = null, bool silent = false, bool init = true)
{
if (string.IsNullOrEmpty(nodeID) || hostCanvas == null)
{
throw new ArgumentException();
}
if (!NodeCanvasManager.CheckCanvasCompability(nodeID, hostCanvas.GetType()))
{
throw new UnityException("Cannot create Node with ID '" + nodeID + "' as it is not compatible with the current canavs type (" + hostCanvas.GetType().ToString() + ")!");
}
if (!hostCanvas.CanAddNode(nodeID))
{
throw new UnityException("Cannot create Node with ID '" + nodeID + "' on the current canvas of type (" + hostCanvas.GetType().ToString() + ")!");
}
// Create node from data
NodeTypeData data = NodeTypes.getNodeData(nodeID);
Node node = (Node)CreateInstance(data.type);
if (node == null)
{
return(null);
}
// Init node state
node.name = node.Title;
node.autoSize = node.DefaultSize;
node.position = pos;
node.Canvas = hostCanvas;
ConnectionPortManager.UpdateConnectionPorts(node);
if (init)
{
node.OnCreate();
}
if (connectingPort != null)
{ // Handle auto-connection and link the output to the first compatible input
for (int i = 0; i < node.connectionPorts.Count; i++)
{
if (node.connectionPorts[i].TryApplyConnection(connectingPort, silent))
{
break;
}
}
}
// Add node to host canvas
hostCanvas.nodes.Add(node);
if (!silent)
{ // Callbacks
hostCanvas.OnNodeChange(connectingPort != null ? connectingPort.body : node);
NodeEditorCallbacks.IssueOnAddNode(node);
hostCanvas.Validate();
NodeEditor.RepaintClients();
}
return(node);
}
/// <summary>
/// Checks whether the süecified nodeID is compatible with the given canvas type
/// 检测制定的Node ID是否与当前Canvas相匹配
/// </summary>
public static bool CheckCanvasCompability(string nodeID, Type canvasType)
{
NodeTypeData data = NodeTypes.GetNodeData(nodeID);
return(data.limitToCanvasTypes == null || data.limitToCanvasTypes.Length == 0 || data.limitToCanvasTypes.Contains(canvasType));
}
/// <summary>
/// Creates a node of the specified ID at pos on the specified canvas, optionally auto-connecting the specified output to a matching input
/// silent disables any events, init specifies whether OnCreate should be called
/// </summary>
public static Node Create(string nodeID, Vector2 pos, NodeCanvas hostCanvas, ConnectionPort connectingPort = null, bool silent = false, bool init = true)
{
if (string.IsNullOrEmpty(nodeID) || hostCanvas == null)
{
throw new ArgumentException();
}
if (!NodeCanvasManager.CheckCanvasCompability(nodeID, hostCanvas.GetType()))
{
throw new UnityException("Cannot create Node with ID '" + nodeID + "' as it is not compatible with the current canavs type (" + hostCanvas.GetType().ToString() + ")!");
}
if (!hostCanvas.CanAddNode(nodeID))
{
throw new UnityException("Cannot create Node with ID '" + nodeID + "' on the current canvas of type (" + hostCanvas.GetType().ToString() + ")!");
}
// Create node from data
NodeTypeData data = NodeTypes.getNodeData(nodeID);
Node node = (Node)CreateInstance(data.type);
if (node == null)
{
return(null);
}
// Init node state
node.canvas = hostCanvas;
node.name = node.Title;
node.autoSize = node.DefaultSize;
node.position = pos;
ConnectionPortManager.UpdateConnectionPorts(node);
if (init)
{
node.OnCreate();
}
if (connectingPort != null)
{ // Handle auto-connection and link the output to the first compatible input
for (int i = 0; i < node.connectionPorts.Count; i++)
{
if (node.connectionPorts[i].TryApplyConnection(connectingPort, true))
{
break;
}
}
}
// Add node to host canvas
hostCanvas.nodes.Add(node);
if (!silent)
{ // Callbacks
hostCanvas.OnNodeChange(connectingPort != null ? connectingPort.body : node);
NodeEditorCallbacks.IssueOnAddNode(node);
hostCanvas.Validate();
NodeEditor.RepaintClients();
}
#if UNITY_EDITOR
if (!silent)
{
List <ConnectionPort> connectedPorts = new List <ConnectionPort>();
foreach (ConnectionPort port in node.connectionPorts)
{ // 'Encode' connected ports in one list (double level cannot be serialized)
foreach (ConnectionPort conn in port.connections)
{
connectedPorts.Add(conn);
}
connectedPorts.Add(null);
}
Node createdNode = node;
UndoPro.UndoProManager.RecordOperation(
() => NodeEditorUndoActions.ReinstateNode(createdNode, connectedPorts),
() => NodeEditorUndoActions.RemoveNode(createdNode),
"Create Node");
// Make sure the new node is in the memory dump
NodeEditorUndoActions.CompleteSOMemoryDump(hostCanvas);
}
#endif
return(node);
}