PyQt - 对象没有属性'connect'

Question

我正在使用PyQt5，并且想要制作一个拖放系统。

我在这篇帖子上找到了代码：PyQT4：将文件拖放到QListWidget中

运行时，我遇到了以下错误：AttributeError: 'MainForm'对象没有属性'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()

- Rémy Kaloustian

Answer 1

问题在于您正在使用一种旧的连接方式，您需要更新以下内容：

创建信号：

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

同时更改：

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

to:

self.dropped.emit(links)

并更改为：

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

to:

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

更多信息可以在此处阅读

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()

- eyllanesc

---

如何在QWidget而不是QListWidget中使用它？ - Rémy Kaloustian

如果我想从QWidget而不是QListWidget继承，我需要做哪些改变？ - Rémy Kaloustian