在PyQt 4中,我想创建一个QTreeView,可以通过拖放操作重组其结构。
我为QTreeView实现了自己的模型(QAbstractItemModel),因此我的QTreeView正确显示了数据。 现在我想为树的节点添加拖放支持,以便能够将树内的节点从一个父节点移动到另一个节点,拖动复制等等,但是我找不到任何完整的教程如何实现这一点。我找到了很少的QTreeWidget教程和提示,但没有为自定义模型的QTreeView找到。 有人能指出我在哪里看?
谢谢。
答案 0 :(得分:17)
您可以通过将 QtGui.QAbstractItemView.InternalMove 设置为treeview控件的dragDropMode属性来启用对树视图项的拖放支持。另请查看此处的文档Using drag & drop with item views。下面是树视图的一个小示例,其内部拖放功能已启用。
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 :具有拖放支持的treeview +抽象模型
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()
希望这有帮助,尊重