Q100108：如何向 Katana 节点添加自定义上下文菜单项

  1. Foundry
  2. Katana
  3. 工作流程帮助

概括

本文介绍了如何在Katana中向节点的上下文菜单（右键菜单）添加自定义菜单项。

更多信息

您可以使用Katana提供的NodeActionDelegate模块向节点的上下文菜单添加自定义菜单项。
以下示例展示了如何为特定节点的上下文菜单注册菜单操作。此示例将向 CameraCreate 节点的上下文菜单添加两个自定义菜单命令。
Katana 8.0 
from Katana import UI4, NodegraphAPI
from UI4.FormMaster.NodeActionDelegate import (BaseNodeActionDelegate, RegisterActionDelegate)
from UI4.Manifest import QtCore, QtGui, QtWidgets


class MyNodeActionDelegate(BaseNodeActionDelegate.BaseNodeActionDelegate):
    class _SelectNodeAction(QtGui.QAction):

        def __init__(self, parent, node):
            QtGui.QAction.__init__(self, 'Select "%s"' % node.getName(), parent)

            self.__node = node
            if node:
                self.triggered.connect(self.__triggered)
            self.setEnabled(self.__node is not None
                            and not self.__node.isLocked(True))

        def __triggered(self, checked):
            NodegraphAPI.SetNodeSelected(self.__node, True)

    class _DeselectNodeAction(QtGui.QAction):

        def __init__(self, parent, node):
            QtGui.QAction.__init__(self, 'Deselect "%s"' % node.getName(), parent)

            self.__node = node
            if node:
                self.triggered.connect(self.__triggered)
            self.setEnabled(self.__node is not None
                            and not self.__node.isLocked(True))

        def __triggered(self, checked):
            NodegraphAPI.SetNodeSelected(self.__node, False)

    def addToContextMenu(self, menu, node):
        menu.addAction(self._SelectNodeAction(menu, node))
        menu.addAction(self._DeselectNodeAction(menu, node))
    
    def addToWrenchMenu(self, menu, node, hints=None):
        pass


RegisterActionDelegate("CameraCreate", MyNodeActionDelegate())
Katana 7.5 及以上
from Katana import UI4, NodegraphAPI
from UI4.FormMaster.NodeActionDelegate import (BaseNodeActionDelegate, RegisterActionDelegate)
from UI4.Manifest import QtCore, QtGui, QtWidgets


class MyNodeActionDelegate(BaseNodeActionDelegate.BaseNodeActionDelegate):
    class _SelectNodeAction(QtWidgets.QAction):

        def __init__(self, parent, node):
            QtWidgets.QAction.__init__(self, 'Select "%s"' % node.getName(), parent)

            self.__node = node
            if node:
                self.triggered.connect(self.__triggered)
            self.setEnabled(self.__node is not None
                            and not self.__node.isLocked(True))

        def __triggered(self, checked):
            NodegraphAPI.SetNodeSelected(self.__node, True)

    class _DeselectNodeAction(QtWidgets.QAction):

        def __init__(self, parent, node):
            QtWidgets.QAction.__init__(self, 'Deselect "%s"' % node.getName(), parent)

            self.__node = node
            if node:
                self.triggered.connect(self.__triggered)
            self.setEnabled(self.__node is not None
                            and not self.__node.isLocked(True))

        def __triggered(self, checked):
            NodegraphAPI.SetNodeSelected(self.__node, False)

    def addToContextMenu(self, menu, node):
        menu.addAction(self._SelectNodeAction(menu, node))
        menu.addAction(self._DeselectNodeAction(menu, node))
    
    def addToWrenchMenu(self, menu, node, hints=None):
        pass


RegisterActionDelegate("CameraCreate", MyNodeActionDelegate())

延伸阅读

如果您想将相同的菜单命令添加到所有类型节点的上下文菜单中，可以将上述示例的最后一行替换为以下内容： 
myNodeActionDelegate = MyNodeActionDelegate()
for nodeTypeName in NodegraphAPI.GetNodeTypes():
     RegisterActionDelegate(nodeTypeName, myNodeActionDelegate)


您还可以针对特定节点类型注册相同的节点操作委托，如下例所示： 

myNodeActionDelegate = MyNodeActionDelegate()
for nodeTypeName in ['AttributeSet', 'CameraCreate', 'OpScript']:
    RegisterActionDelegate(nodeTypeName, myNodeActionDelegate)

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