我遇到了一些試圖爲自定義QListWidgetItem實現拖放操作的poblems。下面是一些示例代碼:拖放子類QListWidgetItem
from PyQt4 import QtGui, QtCore
import sys, os
class MyListWidgetItem(QtGui.QListWidgetItem):
def __init__(self, label, data, parent=None):
super(QtGui.QListWidgetItem, self).__init__(label, parent=parent)
self.data = data
def GetData(self):
return self.data
class MyListWidget(QtGui.QListWidget):
def __init__(self, type, parent=None):
super(MyListWidget, self).__init__(parent)
self.setDragDropMode(QtGui.QAbstractItemView.DragDrop)
self.setSelectionMode(QtGui.QAbstractItemView.ExtendedSelection)
self.setAcceptDrops(True)
self.viewport().setAcceptDrops(True)
self.setDropIndicatorShown(True)
def startDrag(self, supportedActions):
drag = QtGui.QDrag(self)
t = [i.GetData() for i in self.selectedItems()]
mimeData = self.model().mimeData(self.selectedIndexes())
mimeData.setText(str(t))
drag.setMimeData(mimeData)
if drag.start(QtCore.Qt.MoveAction) == QtCore.Qt.MoveAction:
for item in self.selectedItems():
self.takeItem(self.row(item))
def dragEnterEvent(self, event):
if event.mimeData().hasUrls():
event.ignore()
else:
event.accept()
def dragMoveEvent(self, event):
if event.mimeData().hasUrls():
event.ignore()
else:
event.accept()
def dropEvent(self, event):
if event.mimeData().hasUrls():
event.ignore()
if isinstance(event.source(), MyListWidget):
event.setDropAction(QtCore.Qt.MoveAction)
super(MyListWidget, self).dropEvent(event)
else:
event.ignore()
def dropMimeData(self, index, mimedata, action):
super(MyListWidget, self).dropMimeData(index, mimedata, action)
return True
class Test(QtGui.QMainWindow):
def __init__(self):
super(QtGui.QMainWindow,self).__init__()
myQWidget = QtGui.QWidget()
myBoxLayout = QtGui.QVBoxLayout()
myQWidget.setLayout(myBoxLayout)
self.setCentralWidget(myQWidget)
self.listWidgetA = MyListWidget(self)
self.listWidgetB = MyListWidget(self)
for i in range(5):
listItemAInstance = MyListWidgetItem(str(i), i, parent=self.listWidgetA)
myBoxLayout.addWidget(self.listWidgetA)
myBoxLayout.addWidget(self.listWidgetB)
if __name__ == '__main__':
app = QtGui.QApplication(sys.argv)
dialog_1 = Test()
dialog_1.show()
dialog_1.resize(480,320)
sys.exit(app.exec_())
我的自定義類MyListWidgetItem有這在我的真正的程序保存與該項目相關的一些信息的「數據」字段。如果您運行的代碼,並嘗試拖放從上面的列表項的底部有一個一切正常,但如果你再嘗試把他們帶回到頂端列表中,您收到此錯誤:
Traceback (most recent call last):
File "C:\Users\Massi\Desktop\t.py", line 23, in startDrag
t = [i.GetData() for i in self.selectedItems()]
AttributeError: 'QListWidgetItem' object has no attribute 'GetData'
似乎很明顯,默認的拖放行爲會忽略列表項已被分類,所以我想知道哪種方法最適合這種情況。任何幫助真的很感激。 在此先感謝!
不應該是'getData',而不是'GetData'? – neuronet