I have some obvious questions for which I wasn't able to find satisfactory answers. Is there a way (subclass, etc.) to have access to a kind of drag/drop event, so that we could control a dropped item ? I.e. in the example, if we create a copy of item by dragging, it's QStandardItemModel row gets copied, so it gets the same ID and Name . That is obviously unacceptable, ID should be a new one (typically obtained from a database) and Name should be somtehing like "OriginalName_1". Is there a way to control, whether an item can be created on drop or not ? I.e. Toronto shouldn't be allowed to be dropped into United States, but let's pretend it can be dropped to another Canadian state. We need to know where it is being dropped and then have a way to create a record and tree item or do nothing (based on custom function evaluating the items). Is there a way to set QTreeView in a way, that drag&drops within a QTreeView would move items (they're copied by default), while dropping from another QTreeView would copy an item (that works)? I found few threads on this subject, but they don't seem to answer the question and got me perhaps even more confused. Here is a working sample code I use for testing. import sys from PyQt5.QtWidgets import QApplication, QMainWindow, QTreeView, QTreeWidgetItemIterator, QAction from PyQt5.Qt import QStandardItemModel, QStandardItem from PyQt5.QtGui import QFont, QColor class StandardItem(QStandardItem): def __init__(self, txt='', font_size=12, set_bold=False, color=QColor(0, 0, 0)): super().__init__() fnt = QFont('Open Sans', font_size) fnt.setBold(set_bold) self.setEditable(False) self.setForeground(color) self.setFont(fnt) self.setText(txt) class AppDemo(QMainWindow): def __init__(self): super().__init__() self.setWindowTitle('World Country Diagram') self.resize(500, 700) self.tb = self.addToolBar("TestBar") LstTr = QAction("List tree",self) LstTr.triggered.connect(self.ListTree) self.tb.addAction(LstTr) treeView = QTreeView() treeView.setHeaderHidden(True) treeView.setDragEnabled(True) treeView.setAcceptDrops(True) self.treeModel = QStandardItemModel() rootNode = self.treeModel.invisibleRootItem() Data = ( # Database-like test data #ID Parent ID Type Name Prop1 #--------------------------------------------------- ---------- (1, -1, 1, 'United States', 'USA' ), (3, 1, 2, 'California', 'CA' ), (4, 3, 3, 'Oakland', '-' ), (5, 3, 3, 'San Francisco', '-' ), (6, 3, 3, 'San Jose', '-' ), (7, 1, 2, 'Texas', 'TX' ), (8, 7, 3, 'Austin', '-' ), (9, 7, 3, 'Houston', '-' ), (10, 7, 3, 'Dallas', '-' ), (11, -1, 1, 'Canada', 'CAN' ), (12, 11, 2, 'Alberta', '' ), (13, 11, 2, 'British Columbia', '' ), (14, 11, 2, 'Ontario', '' ), (15, 14, 3, 'Toronto', '-' ), (16, 13, 3, 'Vancouver', '-' ), (17, 12, 3, 'Calgary', '-' ), (18, 13, 3, 'Wells', '-' ) ) root = self.treeModel.invisibleRootItem() for ID, ParentID, Type, Name, Prop1 in Data: # for each record, generate an item in a treeModel, used in QTreeView print("ID = " + str(ID)) print("Name = " + Name) it = QStandardItem(Name) it.setData(ID) #, Name) if ParentID == -1: self.treeModel.appendRow(it) for item in self.iterItems(root): #print(item.text()) if item.data() == ParentID: item.appendRow(it) treeView.setModel(self.treeModel) treeView.expandAll() treeView.doubleClicked.connect(self.getValue) self.treeModel.itemChanged.connect(self.ModelItemChanged) self.setCentralWidget(treeView) def getValue(self, val): print(val.data()) print(val.row()) print(val.column()) print("-------------") #self.listTree() def ModelItemChanged(self, val): print("Model item changed") print(val.data()) print(val.row()) print(val.column()) print("-------------") def listTree(self): for it in self.treeModel: print(str(it)) def iterItems(self, root): # get all items, credits to @ekhumuro answer def recurse(parent): for row in range(parent.rowCount()): for column in range(parent.columnCount()): child = parent.child(row, column) yield child if child.hasChildren(): yield from recurse(child) if root is not None: yield from recurse(root) def ListTree(self): print("================================================================") root = self.treeModel.invisibleRootItem() for item in self.iterItems(root): print(item.text() + " " + str(item.data()) ) print("================================================================") app = QApplication(sys.argv) demo = AppDemo() demo.show() sys.exit(app.exec_()) Double click prints current item. On drop a ItemChanged is fired and printed a message. A button "ListTree" lists all treeModel rows - comparing before and after shows how a new row was added. I took this tutorial and heavily modified, with my adjustments, some mods were based on @ekhumuro SO answers. Credits to those authors.

@Oak77 said in QTreeView drag/drop handling : mimedata.setData('text/xml', 'mimeData') TypeError: setData(self, str, Union[QByteArray, bytes, bytearray]): argument 2 has unexpected type 'str' One of (something like) the following: mimedata.setData('text/xml', QtCore.QByteArray('mimeData')) mimedata.setData('text/xml', QtCore.QString('mimeData').toUtf8()) mimedata.setData('text/xml', 'mimeData'.encode())

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QTreeView drag/drop handling

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Oak77
replied to SGaist on last edited by

#21

@SGaist Lost am I :-). I see you pointing out python bytes vs. QByteArray, makes sense, I'll study that. Thank you for caring to comment my rookie issues.
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