PyQt - 对象没有属性“连接”

Question

我正在使用 PyQt5，我想做一个拖放系统。

我得到了这篇帖子的代码：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()

Answer 1

问题是您使用的是旧形式的连接，您必须更新以下内容：

创建信号：

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

也改变：

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

到：

self.dropped.emit(links)

然后改变：

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

到：

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

更多信息可以阅读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()