将一个或多个文件放入ListWidget或LineEdit

Question

我花了整整一周的时间试图弄明白这一点，但我在网上没有找到任何好的PyQt5示例，所以我来了

我想做两件事：

1. 将一个或多个文件从外部窗口（Mac或Windows资源管理器上的Finder？我不知道它在Windows上的名称）拖放到ListWidget中，

2. 执行相同的操作，但将单个文件放到LineEdit中。我希望显示文件的完整路径，以便稍后打开它（本例中未包括）

我从一个ListWidget拖放到另一个ListWidget没有问题，但是我不知道如何拖放不在主窗口中的文件。在下面的代码中，我想将一个或多个文件放入标记为“文件列表”的ListWidget中，或将一个文件放入标记为“行编辑”的LineEdit中

以下是我的GUI代码：

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'example_dragdrop.ui'
#
# Created by: PyQt5 UI code generator 5.13.2
#
# WARNING! All changes made in this file will be lost!


from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(589, 319)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.files_listWidget = QtWidgets.QListWidget(self.centralwidget)
        self.files_listWidget.setGeometry(QtCore.QRect(40, 40, 511, 81))
        self.files_listWidget.setDragDropMode(QtWidgets.QAbstractItemView.DragDrop)
        self.files_listWidget.setAlternatingRowColors(True)
        self.files_listWidget.setObjectName("files_listWidget")
        self.label_1 = QtWidgets.QLabel(self.centralwidget)
        self.label_1.setGeometry(QtCore.QRect(260, 20, 91, 21))
        self.label_1.setAlignment(QtCore.Qt.AlignCenter)
        self.label_1.setObjectName("label_1")
        self.label_2 = QtWidgets.QLabel(self.centralwidget)
        self.label_2.setGeometry(QtCore.QRect(160, 160, 91, 21))
        self.label_2.setAlignment(QtCore.Qt.AlignCenter)
        self.label_2.setObjectName("label_2")
        self.codes_listWidget = QtWidgets.QListWidget(self.centralwidget)
        self.codes_listWidget.setGeometry(QtCore.QRect(60, 180, 291, 81))
        self.codes_listWidget.setDragDropMode(QtWidgets.QAbstractItemView.DragDrop)
        self.codes_listWidget.setAlternatingRowColors(True)
        self.codes_listWidget.setObjectName("codes_listWidget")
        self.availCodes_listWidget = QtWidgets.QListWidget(self.centralwidget)
        self.availCodes_listWidget.setGeometry(QtCore.QRect(380, 180, 101, 81))
        self.availCodes_listWidget.setDragEnabled(True)
        self.availCodes_listWidget.setDragDropMode(QtWidgets.QAbstractItemView.DragOnly)
        self.availCodes_listWidget.setAlternatingRowColors(True)
        self.availCodes_listWidget.setObjectName("availCodes_listWidget")
        item = QtWidgets.QListWidgetItem()
        self.availCodes_listWidget.addItem(item)
        item = QtWidgets.QListWidgetItem()
        self.availCodes_listWidget.addItem(item)
        item = QtWidgets.QListWidgetItem()
        self.availCodes_listWidget.addItem(item)
        item = QtWidgets.QListWidgetItem()
        self.availCodes_listWidget.addItem(item)
        self.label_3 = QtWidgets.QLabel(self.centralwidget)
        self.label_3.setGeometry(QtCore.QRect(380, 160, 91, 21))
        self.label_3.setAlignment(QtCore.Qt.AlignCenter)
        self.label_3.setObjectName("label_3")
        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit.setGeometry(QtCore.QRect(110, 130, 441, 21))
        self.lineEdit.setObjectName("lineEdit")
        self.label_4 = QtWidgets.QLabel(self.centralwidget)
        self.label_4.setGeometry(QtCore.QRect(20, 130, 91, 21))
        self.label_4.setAlignment(QtCore.Qt.AlignCenter)
        self.label_4.setObjectName("label_4")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 589, 22))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "Drag & Drop List Widget"))
        self.label_1.setText(_translate("MainWindow", "Files List"))
        self.label_2.setText(_translate("MainWindow", "Codes List"))
        __sortingEnabled = self.availCodes_listWidget.isSortingEnabled()
        self.availCodes_listWidget.setSortingEnabled(False)
        item = self.availCodes_listWidget.item(0)
        item.setText(_translate("MainWindow", "Python"))
        item = self.availCodes_listWidget.item(1)
        item.setText(_translate("MainWindow", "C++"))
        item = self.availCodes_listWidget.item(2)
        item.setText(_translate("MainWindow", "Ruby"))
        item = self.availCodes_listWidget.item(3)
        item.setText(_translate("MainWindow", "Perl"))
        self.availCodes_listWidget.setSortingEnabled(__sortingEnabled)
        self.label_3.setText(_translate("MainWindow", "Codes"))
        self.label_4.setText(_translate("MainWindow", "Line Edit"))


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

以下是我的源代码：

import os
import sys
from PyQt5 import QtGui, QtCore
from PyQt5.QtWidgets import QMainWindow, QApplication, QListWidget
from example_dragdrop import Ui_MainWindow


class MainWindow(QMainWindow):

    def __init__(self):
        QMainWindow.__init__(self)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)

        self.ui.files_listWidget = DragDropList(self)

        self.ui.files_listWidget.dropped.connect(self.files_dropped)

    def files_dropped(self, url_list):
        for url in url_list:
            if os.path.exists(url):
                QtGui.QListWidgetItem(url, self.ui.files_listWidget)


class DragDropList(QListWidget):
    dropped = QtCore.pyqtSignal(list)

    def __init__(self, type, parent=None):
        super(DragDropList, self).__init__(parent)
        self.setAcceptDrops(True)

    def dragEnterEvent(self, event):
        if event.mimeData().hasUrls():
            event.accept()
        else:
            event.ignore()

    def dragMoveEvent(self, event):
        if event.mimeData().hasUrls():
            event.setDropAction(QtCore.Qt.CopyAction)
            event.accept()
        else:
            event.ignore()

    def dropEvent(self, event):
        if event.mimeData().hasUrls():
            event.setDropAction(QtCore.Qt.CopyAction)
            event.accept()

            urls = []
            for url in event.mimeData().urls():
                urls.append(str(url.toLocalFile()))
            self.dropped.emit(urls)
        else:
            event.ignore() 


if __name__ == "__main__":
    app = QApplication(sys.argv)
    main = MainWindow()
    main.show()
    sys.exit(app.exec_())

Answer 1

主要问题是，您正在使用以下代码执行此操作：

self.ui.files_listWidget = DragDropList(self)

您正在替换小部件，这是错误的，您指出变量“self.ui.files\u listWidget”现在引用了另一个小部件，但该更改不会应用于窗口中

其思想是“self.ui.files\u listWidget”从一开始就存储一个自定义QListWidget对象，因此您必须进行以下更改：

1. 创建一个模块，其中自定义小部件包括：

   dropwidgets.py

   from PyQt5 import QtCore, QtWidgets
   
   
   class DropList(QtWidgets.QListWidget):
       def __init__(self, parent=None):
           super(DropList, self).__init__(parent)
           self.setAcceptDrops(True)
   
       def dragEnterEvent(self, event):
           if event.mimeData().hasUrls():
               event.acceptProposedAction()
           else:
               event.ignore()
   
       def dragMoveEvent(self, event):
           if event.mimeData().hasUrls():
               event.acceptProposedAction()
           else:
               event.ignore()
   
       def dropEvent(self, event):
           md = event.mimeData()
           if md.hasUrls():
               for url in md.urls():
                   self.addItem(url.toLocalFile())
               event.acceptProposedAction()
   
   
   class DropLineEdit(QtWidgets.QLineEdit):
       def dragEnterEvent(self, event):
           if event.mimeData().hasUrls():
               event.acceptProposedAction()
   
       def dropEvent(self, event):
           md = event.mimeData()
   
           if md.hasUrls():
               files = []
               for url in md.urls():
                   files.append(url.toLocalFile())
               self.setText(" ".join(files))
               event.acceptProposedAction()
   

2. 在文件示例_dragdrop.py中，分别将QListWidget和QLineEdit替换为DropList和DropLineEdit

   # ...
   from dropwidgets import DropList, DropLineEdit
   
   class Ui_MainWindow(object):
       def setupUi(self, MainWindow):
           MainWindow.setObjectName("MainWindow")
           MainWindow.resize(589, 319)
           self.centralwidget = QtWidgets.QWidget(MainWindow)
           self.centralwidget.setObjectName("centralwidget")
           self.files_listWidget = DropList(self.centralwidget)
           self.files_listWidget.setGeometry(QtCore.QRect(40, 40, 511, 81))
           # ...
           self.label_3.setObjectName("label_3")
           self.lineEdit = DropLineEdit(self.centralwidget)
           self.lineEdit.setGeometry(QtCore.QRect(110, 130, 441, 21))
           # ...
   
   def retranslateUi(self, MainWindow):
       # ... 
   

3. 从主文件中删除不必要的代码：

   import sys
   
   from PyQt5 import QtWidgets
   
   from example_dragdrop import Ui_MainWindow
   
   
   class MainWindow(QtWidgets.QMainWindow):
       def __init__(self, parent=None):
           super(MainWindow, self).__init__(parent)
           self.ui = Ui_MainWindow()
           self.ui.setupUi(self)
   
   
   if __name__ == "__main__":
       app = QtWidgets.QApplication(sys.argv)
       main = MainWindow()
       main.show()
       sys.exit(app.exec_())