【发布时间】：2019-12-05 23:36:44
【问题描述】：
我想拖放标签，我的代码就是这样做的，但是在移动它时标签消失了。如何在拖动标签时保持标签可见？我正在使用 QDrag 复制内容。
我希望能够将这些标签拖到一个有许多插槽的盒子中，并在标签掉到附近时将标签锁定到其中一个插槽中。由于标签在被拖动时变得不可见，因此当我松开鼠标按钮时，很难想象它会被放置在哪里。
from PySide import QtCore, QtGui
myMimeType = 'application/MyWindow'
class MyLabel(QtGui.QLabel):
def __init__(self, parent):
super(MyLabel, self).__init__(parent)
self.setStyleSheet("""
background-color: black;
color: white;
font: bold;
padding: 6px;
border-width: 2px;
border-style: solid;
border-radius: 16px;
border-color: white;
""")
def mousePressEvent(self, event):
itemData = QtCore.QByteArray()
dataStream = QtCore.QDataStream(itemData, QtCore.QIODevice.WriteOnly)
dataStream.writeString(self.text())
dataStream << QtCore.QPoint(event.pos() - self.rect().topLeft())
print dataStream
mimeData = QtCore.QMimeData()
mimeData.setData(myMimeType, itemData)
mimeData.setText(self.text())
drag = QtGui.QDrag(self)
drag.setMimeData(mimeData)
drag.setHotSpot(event.pos() - self.rect().topRight())
self.hide()
if drag.exec_(QtCore.Qt.MoveAction | QtCore.Qt.CopyAction, QtCore.Qt.CopyAction) == QtCore.Qt.MoveAction:
self.close()
else:
self.show()
class MyFrame(QtGui.QFrame):
def __init__(self, parent=None):
super(MyFrame, self).__init__(parent)
self.setStyleSheet("""
background-color: lightgray;
border-width: 2px;
border-style: solid;
border-color: black;
margin: 2px;
""")
y = 6
for labelNumber in range(6):
label = MyLabel(self)
label.setText("Label #{0}".format(labelNumber))
label.move(6, y)
label.show()
y += label.height() + 2
self.setAcceptDrops(True)
def dragEnterEvent(self, event):
if event.mimeData().hasFormat(myMimeType):
if event.source() in self.children():
event.setDropAction(QtCore.Qt.MoveAction)
event.accept()
else:
event.acceptProposedAction()
else:
event.ignore()
def dropEvent(self, event):
if event.mimeData().hasFormat(myMimeType):
mime = event.mimeData()
itemData = mime.data(myMimeType)
dataStream = QtCore.QDataStream(itemData, QtCore.QIODevice.ReadOnly)
text = QtCore.QByteArray()
offset = QtCore.QPoint()
dataStream >> text >> offset
newLabel = MyLabel(self)
newLabel.setText(event.mimeData().text())
newLabel.move(event.pos() - offset)
newLabel.show()
if event.source() in self.children():
event.setDropAction(QtCore.Qt.MoveAction)
event.accept()
else:
event.acceptProposedAction()
else:
event.ignore()
class MyWindow(QtGui.QMainWindow):
def __init__(self, parent=None):
super(MyWindow, self).__init__(parent)
self.myFrame = MyFrame(self)
self.setCentralWidget(self.myFrame)
if __name__ == "__main__":
import sys
app = QtGui.QApplication(sys.argv)
app.setApplicationName('MyWindow')
main = MyWindow()
main.resize(333, 333)
main.move(app.desktop().screen().rect().center() - main.rect().center())
main.show()
sys.exit(app.exec_())
【问题讨论】：
标签： python qt pyqt drag-and-drop pyside