python之PyQt之对象没有属性 'connect'

我正在使用 PyQt5，我想制作一个拖放系统。

我在这篇文章中得到了代码:PyQT4: Drag and drop files into QListWidget

当我运行时，出现以下错误:AttributeError: 'MainForm' object has no attribute 'connect'

代码:

import sys 
import os 
from PyQt5.Qt import * 
from PyQt5.QtGui import * 
from PyQt5.QtCore import * 
 
class TestListView(QListWidget): 
    def __init__(self, type, parent=None): 
        super(TestListView, self).__init__(parent) 
        self.setAcceptDrops(True) 
        self.setIconSize(QSize(72, 72)) 
 
    def dragEnterEvent(self, event): 
        if event.mimeData().hasUrls: 
            event.accept() 
        else: 
            event.ignore() 
 
    def dragMoveEvent(self, event): 
        if event.mimeData().hasUrls: 
            event.setDropAction(Qt.CopyAction) 
            event.accept() 
        else: 
            event.ignore() 
 
    def dropEvent(self, event): 
        if event.mimeData().hasUrls: 
            event.setDropAction(Qt.CopyAction) 
            event.accept() 
            links = [] 
            for url in event.mimeData().urls(): 
                links.append(str(url.toLocalFile())) 
            self.emit(Qt.SIGNAL("dropped"), links) 
        else: 
            event.ignore() 
 
class MainForm(QMainWindow): 
    def __init__(self, parent=None): 
        super(MainForm, self).__init__(parent) 
 
        self.view = TestListView(self) 
        self.connect(self.view, Qt.SIGNAL("dropped"), self.pictureDropped) 
        self.setCentralWidget(self.view) 
 
    def pictureDropped(self, l): 
        for url in l: 
            if os.path.exists(url): 
                print(url) 
                icon = QIcon(url) 
                pixmap = icon.pixmap(72, 72) 
                icon = QIcon(pixmap) 
                item = QListWidgetItem(url, self.view) 
                item.setIcon(icon) 
                item.setStatusTip(url) 
 
def main(): 
    app = QApplication(sys.argv) 
    form = MainForm() 
    form.show() 
    app.exec_() 
 
if __name__ == '__main__': 
    main() 

请您参考如下方法:

问题是您使用的是旧的连接形式，您必须更新以下内容:

创建信号:

class TestListView(QListWidget): 
    dropped = pyqtSignal(list) 

同时改变:

self.emit(Qt.SIGNAL("dropped"), links) 

到:

self.dropped.emit(links) 

并改变:

self.connect(self.view, Qt.SIGNAL("dropped"), self.pictureDropped) 

到:

self.view.dropped.connect(self.pictureDropped) 

有关更多信息，您可以阅读 here

完整代码:

import sys 
import os 
from PyQt5.Qt import * 
from PyQt5.QtGui import * 
from PyQt5.QtCore import * 
 
class TestListView(QListWidget): 
    dropped = pyqtSignal(list) 
    def __init__(self, type, parent=None): 
        super(TestListView, self).__init__(parent) 
        self.setAcceptDrops(True) 
        self.setIconSize(QSize(72, 72)) 
 
    def dragEnterEvent(self, event): 
        if event.mimeData().hasUrls: 
            event.accept() 
        else: 
            event.ignore() 
 
    def dragMoveEvent(self, event): 
        if event.mimeData().hasUrls: 
            event.setDropAction(Qt.CopyAction) 
            event.accept() 
        else: 
            event.ignore() 
 
    def dropEvent(self, event): 
        if event.mimeData().hasUrls: 
            event.setDropAction(Qt.CopyAction) 
            event.accept() 
            links = [] 
            for url in event.mimeData().urls(): 
                links.append(str(url.toLocalFile())) 
            self.dropped.emit(links) 
        else: 
            event.ignore() 
 
class MainForm(QMainWindow): 
    def __init__(self, parent=None): 
        super(MainForm, self).__init__(parent) 
 
        self.view = TestListView(self) 
        self.view.dropped.connect(self.pictureDropped) 
        self.setCentralWidget(self.view) 
 
    def pictureDropped(self, l): 
        for url in l: 
            if os.path.exists(url): 
                print(url) 
                icon = QIcon(url) 
                pixmap = icon.pixmap(72, 72) 
                icon = QIcon(pixmap) 
                item = QListWidgetItem(url, self.view) 
                item.setIcon(icon) 
                item.setStatusTip(url) 
 
def main(): 
    app = QApplication(sys.argv) 
    form = MainForm() 
    form.show() 
    app.exec_() 
 
if __name__ == '__main__': 
    main()