我正在尝试使用 PyQt5 将 Qlabel 拖放到另一个 Qlabel 上：
from PyQt5.QtWidgets import QApplication, QWidget, QToolTip, QPushButton, QMessageBox, QHBoxLayout, QVBoxLayout, QGridLayout,QFrame, QComboBox, QLabel, QLineEdit
from PyQt5.QtGui import QIcon, QFont, QPixmap, QImage
import sys
class my_label(QLabel):
def __init__(self,title,parent):
super().__init__(title,parent)
self.setAcceptDrops(True)
def dragEnterEvent(self,event):
if event.mimeData().hasFormat("text/plain"):
event.accept()
else:
event.ignore()
def dropEvent(self,event):
self.setText(event.mimeData().text())
class application(QWidget):
def __init__(self):
super().__init__()
self.initUI()
def initUI(self):
label = my_label("drop there",self)
label.resize(100,100)
label.move(190,65)
label_to_drag = QLabel("drag this",self)
#label_to_drag.setDragEnabled(True) #doesn't work with QLabel
self.show()
def closeEvent(self,event):
message = QMessageBox.question(self,"Message","Quit ?",QMessageBox.Yes | QMessageBox.No,QMessageBox.No)
if message == QMessageBox.Yes:
event.accept()
else:
event.ignore()
app = QApplication(sys.argv)
fenetre = application()
sys.exit(app.exec_())
我想让我的第一个标签“可拖动”，通过调用setDragEnabled(True)方法（就像我对 QLineEdit 所做的那样），并将其放在第二个标签上以更改他的文本。从另一个应用程序删除文本工作正常，但我找不到如何将 QLabel 拖到我自己的应用程序中......
我错过了什么 ？
编辑：修改代码以尝试拖放图像：
class DraggableLabel(QLabel):
def __init__(self,parent,image):
super(QLabel,self).__init__(parent)
self.setPixmap(QPixmap(image))
self.show()
def mousePressEvent(self, event):
if event.button() == Qt.LeftButton:
self.drag_start_position = event.pos()
def mouseMoveEvent(self, event):
if not (event.buttons() & Qt.LeftButton):
return
if (event.pos() - self.drag_start_position).manhattanLength() < QApplication.startDragDistance():
return
drag = QDrag(self)
mimedata = QMimeData()
mimedata.setText(self.text())
drag.setMimeData(mimedata)
pixmap = QPixmap(self.size())
painter = QPainter(pixmap)
painter.drawPixmap(self.rect(), self.grab())
painter.end()
drag.setPixmap(pixmap)
drag.setHotSpot(event.pos())
drag.exec_(Qt.CopyAction | Qt.MoveAction)
class my_label(QLabel):
def __init__(self,title,parent):
super().__init__(title,parent)
self.setAcceptDrops(True)
def dragEnterEvent(self,event):
if event.mimeData().hasFormat("text/plain"):
print("event accepted")
event.accept()
else:
print("event rejected")
event.ignore()
def dropEvent(self,event):
if event.mimeData().hasImage():
self.setPixmap(QPixmap.fromImage(QImage(event.mimeData().imageData())))
class application(QWidget):
def __init__(self):
super().__init__()
self.initUI()
def initUI(self):
label_to_drag = DraggableLabel(self,"index.jpg")
label = my_label("drop there",self)
label.resize(100,100)
label.move(190,65)
self.show()
当我放下DraggableLabel（显示图像）上my_label,事件被接受，但是hasImage()总是返回 false...我设置图像的方式是否错误？
