在 PyQt 中支持拖放的 QTreeView
问题描述
在 PyQt 4 中，我想创建一个 QTreeView，可以通过拖放操作重新组织其结构.
In PyQt 4 I would like to create a QTreeView with possibility to reorganize its structure with drag and drop manipulation.
我已经为 QTreeView 实现了自己的模型(QAbstractItemModel)，因此我的 QTreeView 可以正确显示数据.现在我想添加对树节点的拖放支持，以便能够将树内的节点从一个父节点移动到另一个父节点，拖放复制等等，但我找不到任何完整的教程来实现这一点.我找到了一些关于 QTreeWidget 的教程和提示，但没有找到带有自定义模型的 QTreeView.有人能指点我在哪里看吗?
I have implemented my own model(QAbstractItemModel) for QTreeView so my QTreeView properly displays the data. Now I would like to add drag and drop support for tree's nodes to be able to move a node inside the tree from one parent to another one, drag-copy and so on, but I cannot find any complete tutorial how to achieve this. I have found few tutorials and hints for QTreeWidget, but not for QTreeView with custom model. Can someone point me where to look?
谢谢.
解决方案
您可以通过将 QtGui.QAbstractItemView.InternalMove 设置为 dragDropMode 属性树视图控件.另请查看此处的文档 使用拖动&与项目视图一起丢弃.下面是一个为其项目启用内部拖放的树视图的小示例.
You can enable drag and drop support for tree view items by setting QtGui.QAbstractItemView.InternalMove into the dragDropMode property of the treeview control. Also take a look at the documentation here Using drag & drop with item views. Below is a small example of a treeview with internal drag and drop enabled for its items.
import sys
from PyQt4 import QtGui, QtCore
class MainForm(QtGui.QMainWindow):
def __init__(self, parent=None):
super(MainForm, self).__init__(parent)
self.model = QtGui.QStandardItemModel()
for k in range(0, 4):
parentItem = self.model.invisibleRootItem()
for i in range(0, 4):
item = QtGui.QStandardItem(QtCore.QString("item %0 %1").arg(k).arg(i))
parentItem.appendRow(item)
parentItem = item
self.view = QtGui.QTreeView()
self.view.setModel(self.model)
self.view.setDragDropMode(QtGui.QAbstractItemView.InternalMove)
self.setCentralWidget(self.view)
def main():
app = QtGui.QApplication(sys.argv)
form = MainForm()
form.show()
app.exec_()
if __name__ == '__main__':
main()
Edit0:树视图+抽象模型，支持拖放
Edit0: treeview + abstract model with drag and drop support
import sys
from PyQt4 import QtGui, QtCore
class TreeModel(QtCore.QAbstractItemModel):
def __init__(self):
QtCore.QAbstractItemModel.__init__(self)
self.nodes = ['node0', 'node1', 'node2']
def index(self, row, column, parent):
return self.createIndex(row, column, self.nodes[row])
def parent(self, index):
return QtCore.QModelIndex()
def rowCount(self, index):
if index.internalPointer() in self.nodes:
return 0
return len(self.nodes)
def columnCount(self, index):
return 1
def data(self, index, role):
if role == 0:
return index.internalPointer()
else:
return None
def supportedDropActions(self):
return QtCore.Qt.CopyAction | QtCore.Qt.MoveAction
def flags(self, index):
if not index.isValid():
return QtCore.Qt.ItemIsEnabled
return QtCore.Qt.ItemIsEnabled | QtCore.Qt.ItemIsSelectable |
QtCore.Qt.ItemIsDragEnabled | QtCore.Qt.ItemIsDropEnabled
def mimeTypes(self):
return ['text/xml']
def mimeData(self, indexes):
mimedata = QtCore.QMimeData()
mimedata.setData('text/xml', 'mimeData')
return mimedata
def dropMimeData(self, data, action, row, column, parent):
print 'dropMimeData %s %s %s %s' % (data.data('text/xml'), action, row, parent)
return True
class MainForm(QtGui.QMainWindow):
def __init__(self, parent=None):
super(MainForm, self).__init__(parent)
self.treeModel = TreeModel()
self.view = QtGui.QTreeView()
self.view.setModel(self.treeModel)
self.view.setDragDropMode(QtGui.QAbstractItemView.InternalMove)
self.setCentralWidget(self.view)
def main():
app = QtGui.QApplication(sys.argv)
form = MainForm()
form.show()
app.exec_()
if __name__ == '__main__':
main()
希望这会有所帮助，问候
hope this helps, regards
相关文章