目标是能够将 ListWidget 项目拖放到组合框上。掉落的项目应添加到组合框中。理想情况下，我们希望避免读取 listWidget 的 .currentItem() 或 .selectedItems() 等的任何技巧......有想法吗？
from PyQt4 import QtGui, QtCore
import sys, os
class MyClass(object):
def __init__(self):
super(MyClass, self).__init__()
self.name=None
def setName(self, arg):
self.name=arg
def getName(self):
return self.name
class DropableComboBox(QtGui.QComboBox):
def __init__(self):
self.model_mime_type = 'application/x-qabstractitemmodeldatalist'
super(DropableComboBox, self).__init__()
self.setAcceptDrops(True)
def dragEnterEvent(self, event):
if event.mimeData().hasFormat(self.model_mime_type) or event.mimeData().hasFormat('text/plain'):
event.accept()
else:
event.ignore()
def dropEvent(self, event):
if event.mimeData().hasUrls():
event.setDropAction(QtCore.Qt.CopyAction)
event.accept()
links = []
for url in event.mimeData().urls():
links.append(str(url.toLocalFile()))
self.emit(QtCore.SIGNAL("dropped"), links)
else:
super(DropableComboBox, self).dropEvent(event)
self.emit(QtCore.SIGNAL("dropped"))
class Dialog_01(QtGui.QMainWindow):
def __init__(self):
super(QtGui.QMainWindow,self).__init__()
myQWidget = QtGui.QWidget()
myBoxLayout = QtGui.QVBoxLayout()
myQWidget.setLayout(myBoxLayout)
self.setCentralWidget(myQWidget)
self.listWidget = QtGui.QListWidget()
self.listWidget.setDragDropMode(QtGui.QAbstractItemView.DragDrop)
self.listWidget.setSelectionMode(QtGui.QAbstractItemView.ExtendedSelection)
self.listWidget.currentItemChanged.connect(self.item_clicked)
for i in range(3):
my_item=QtGui.QListWidgetItem()
name='ListWidget Item '+str(i)
my_item.setText(name)
self.listWidget.addItem(my_item)
myObject=MyClass()
myObject.setName(name)
my_item.setData(QtCore.Qt.UserRole, myObject)
myBoxLayout.addWidget(self.listWidget)
self.ComboBox = DropableComboBox()
for i in range(3):
self.ComboBox.addItem("Combobox Item " + str(i))
self.ComboBox.currentIndexChanged.connect(self.combobox_selected)
self.connect(self.ComboBox, QtCore.SIGNAL("dropped"), self.droppedOnCombobox)
myBoxLayout.addWidget(self.ComboBox)
def item_clicked(self, arg=None):
print arg.data(QtCore.Qt.UserRole).toPyObject().getName()
def combobox_selected(self, index):
myObject=self.ComboBox.itemData(index).toPyObject()
if hasattr(myObject, 'getName'): print myObject.getName()
def droppedOnCombobox(self):
print "Drop!"
if __name__ == '__main__':
app = QtGui.QApplication(sys.argv)
dialog_1 = Dialog_01()
dialog_1.show()
dialog_1.resize(480,320)
sys.exit(app.exec_())
执行此操作的“正确”方法是使用QDataStream。然而，这似乎需要使用QMap，这在 PyQt 中不可用。因此，它可以通过一种稍微有点hacky（或者应该是“棘手”？）的方式来完成，通过为我们提供一个代理模型来完成肮脏的工作：
class DropableComboBox(QtGui.QComboBox):
def __init__(self):
super(DropableComboBox, self).__init__()
self.model_mime_type = 'application/x-qabstractitemmodeldatalist'
self.setAcceptDrops(True)
self._proxymodel = QtGui.QStandardItemModel(self)
def dropEvent(self, event):
if event.mimeData().hasUrls():
event.setDropAction(QtCore.Qt.CopyAction)
event.accept()
links = []
for url in event.mimeData().urls():
links.append(str(url.toLocalFile()))
self.emit(QtCore.SIGNAL("dropped"), links)
elif event.mimeData().hasFormat(self.model_mime_type):
self._proxymodel.setRowCount(0)
self._proxymodel.dropMimeData(
event.mimeData(), QtCore.Qt.CopyAction,
0, 0, QtCore.QModelIndex())
for index in range(self._proxymodel.rowCount()):
item = self._proxymodel.item(index, 0)
self.addItem(item.text())
# no point calling the base-class dropEvent here,
# because it's a NO-OP in QComboBox
self.emit(QtCore.SIGNAL("dropped"))
NB:
这会copy列表小部件中的项目，而不是moving他们（你没有要求）。另外，如果您想防止添加重复项，请使用启用重复项 http://qt-project.org/doc/qt-4.8/qcombobox.html#duplicatesEnabled-prop。如果您想更改项目的添加方式，请使用设置插入策略 http://qt-project.org/doc/qt-4.8/qcombobox.html#insertPolicy-prop.
本文内容由网友自发贡献，版权归原作者所有，本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容，请联系:hwhale#tublm.com(使用前将#替换为@)
