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from PyQt5.QtCore import pyqtSignal, QMimeData, QObject |
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from PyQt5.QtGui import QStandardItemModel, QStandardItem, QIcon |
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from PyQt5.QtWidgets import QApplication, QAbstractItemView |
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from opcua import ua |
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class TreeWidget(QObject): |
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error = pyqtSignal(str) |
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def __init__(self, view): |
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QObject.__init__(self, view) |
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self.view = view |
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self.model = TreeViewModel() |
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self.model.clear() # FIXME: do we need this? |
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#self.model.error.connect(lambda x: self.error.emit(x)) |
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self.model.error.connect(self.error) |
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self.view.setModel(self.model) |
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#self.view.setUniformRowHeights(True) |
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self.view.setSelectionBehavior(QAbstractItemView.SelectRows) |
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self.view.header().setSectionResizeMode(1) |
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def clear(self): |
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self.model.clear() |
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def start(self, uaclient): |
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self.model.clear() |
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self.model.set_uaclient(uaclient) |
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self.model.add_item(self._get_root_desc(uaclient)) |
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def _get_root_desc(self, uaclient): |
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node = uaclient.get_root_node() |
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attrs = node.get_attributes([ua.AttributeIds.DisplayName, ua.AttributeIds.BrowseName, ua.AttributeIds.NodeId, ua.AttributeIds.NodeClass]) |
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desc = ua.ReferenceDescription() |
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desc.DisplayName = attrs[0].Value.Value |
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desc.BrowseName = attrs[1].Value.Value |
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desc.NodeId = attrs[2].Value.Value |
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desc.NodeClass = attrs[3].Value.Value |
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desc.TypeDefinition = ua.TwoByteNodeId(ua.ObjectIds.FolderType) |
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return desc |
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def copy_path(self): |
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path = self.get_current_path() |
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path_str = ",".join(path) |
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QApplication.clipboard().setText(path_str) |
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def copy_nodeid(self): |
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node = self.get_current_node() |
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if node: |
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text = node.nodeid.to_string() |
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else: |
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text = "" |
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QApplication.clipboard().setText(text) |
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def get_current_path(self): |
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idx = self.view.currentIndex() |
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idx = idx.sibling(idx.row(), 0) |
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it = self.model.itemFromIndex(idx) |
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path = [] |
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while it and it.data(): |
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node = it.data() |
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name = node.get_browse_name().to_string() |
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path.insert(0, name) |
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it = it.parent() |
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return path |
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def get_current_node(self, idx=None): |
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if idx is None: |
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idx = self.view.currentIndex() |
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idx = idx.sibling(idx.row(), 0) |
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it = self.model.itemFromIndex(idx) |
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if not it: |
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return None |
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node = it.data() |
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if not node: |
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print("No node for item:", it, it.text()) |
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return None |
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return node |
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class TreeViewModel(QStandardItemModel): |
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error = pyqtSignal(str) |
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def __init__(self): |
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super(TreeViewModel, self).__init__() |
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self.uaclient = None |
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self._fetched = [] |
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def set_uaclient(self, uaclient): |
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self.uaclient = uaclient |
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def clear(self): |
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QStandardItemModel.clear(self) |
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self._fetched = [] |
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self.setHorizontalHeaderLabels(['DisplayName', "BrowseName", 'NodeId']) |
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def add_item(self, desc, parent=None): |
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item = [QStandardItem(desc.DisplayName.to_string()), QStandardItem(desc.BrowseName.to_string()), QStandardItem(desc.NodeId.to_string())] |
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if desc.NodeClass == ua.NodeClass.Object: |
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if desc.TypeDefinition == ua.TwoByteNodeId(ua.ObjectIds.FolderType): |
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item[0].setIcon(QIcon(":/folder.svg")) |
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else: |
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item[0].setIcon(QIcon(":/object.svg")) |
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elif desc.NodeClass == ua.NodeClass.Variable: |
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if desc.TypeDefinition == ua.TwoByteNodeId(ua.ObjectIds.PropertyType): |
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item[0].setIcon(QIcon(":/property.svg")) |
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else: |
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item[0].setIcon(QIcon(":/variable.svg")) |
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elif desc.NodeClass == ua.NodeClass.Method: |
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item[0].setIcon(QIcon(":/method.svg")) |
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item[0].setData(self.uaclient.get_node(desc.NodeId)) |
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if parent: |
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return parent.appendRow(item) |
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else: |
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return self.appendRow(item) |
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def canFetchMore(self, idx): |
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item = self.itemFromIndex(idx) |
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if not item: |
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return True |
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node = item.data() |
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if node not in self._fetched: |
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self._fetched.append(node) |
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return True |
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return False |
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def hasChildren(self, idx): |
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item = self.itemFromIndex(idx) |
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if not item: |
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return True |
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node = item.data() |
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if node in self._fetched: |
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return QStandardItemModel.hasChildren(self, idx) |
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return True |
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def fetchMore(self, idx): |
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parent = self.itemFromIndex(idx) |
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if parent: |
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self._fetchMore(parent) |
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def _fetchMore(self, parent): |
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try: |
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descs = parent.data().get_children_descriptions() |
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for desc in descs: |
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self.add_item(desc, parent) |
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except Exception as ex: |
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self.error.emit(ex) |
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raise |
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#def flags(self, idx): |
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#item = self.itemFromIndex(idx) |
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#flags = QStandardItemModel.flags(self, idx) |
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#if not item: |
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#return flags |
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#node = item.data() |
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#if node and node.get_node_class() == ua.NodeClass.Variable: |
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## FIXME not efficient to query, should be stored in data() |
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##print(1, flags) |
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#return flags | Qt.ItemIsDropEnabled |
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#else: |
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#print(2, flags) |
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#return flags |
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#def mimeTypes(self): |
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#return ["application/vnd.text.list"] |
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def mimeData(self, idxs): |
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mdata = QMimeData() |
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nodes = [] |
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for idx in idxs: |
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item = self.itemFromIndex(idx) |
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if item: |
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node = item.data() |
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if node: |
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nodes.append(node.nodeid.to_string()) |
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mdata.setText(", ".join(nodes)) |
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return mdata |
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FreeOpcUa /
opcua-client-gui
