Python PyCharm利用PyQt5使QPlainTextEdit支持拖放文件，重写QPlainTextEdit类，类提升

# -*- coding: utf-8 -*-
from PyQt5.QtCore import pyqtSignal
from PyQt5.QtWidgets import QPlainTextEdit




class MyQPlainTextEdit(QPlainTextEdit):
    """QPlainTextEdit控件实现文件拖放功能"""


    # 定义一个信号
    sendmsg = pyqtSignal(object)


    def __init__(self, parent=None):
        super(MyQPlainTextEdit, self).__init__(parent)
        self.setAcceptDrops(True)
        self.strPathFile = ""


    def dragEnterEvent(self, e):
        self.strPathFile = e.mimeData().text().replace('file:///', '')
        if self.strPathFile.endswith('.xls') or self.strPathFile.endswith('.xlsx'):
            e.accept()
        else:
            self.strPathFile = ""
            e.ignore()


    def dropEvent(self, e):
        super().dropEvent(e)  # 加这一句即可
        # 发射信号
        self.sendmsg.emit(self.strPathFile)
        

# 绑定信号和槽
  self.plainTextEdit.sendmsg.connect(self.slotDoDropEvent)

 def slotDoDropEvent(self, strXlsFilePath):
        """
        槽函数：QPlainTextEdit控件拖放excel文件后处理函数
        """
        # 文件存在就加载，不存在就提示。
        if os.path.exists(strXlsFilePath):
            self.plainTextEdit.setPlainText(strXlsFilePath)
            print(strXlsFilePath)
        else:
            # 提示信息框
            win32api.MessageBox(0, "文件路径不存在，请先拖放excel文件到编辑框上！", "提示", win32con.MB_ICONWARNING)

"""
python主文件
"""
# -*- coding: utf-8 -*-
import os
import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QDesktopWidget
from PyQt5 import QtCore
import win32api
import win32con


import MyQTMainForm  # 导入MyQTMainForm.py文件




class MyPyQTMainForm(QMainWindow, MyQTMainForm.Ui_MainWindow):
    """
    主界面
    """


    def __init__(self):
        """
        初始化
        """
        super(MyPyQTMainForm, self).__init__()
        self.setupUi(self)


        # QPlainTextEdit初始化
        self.plainTextEdit.clear()
        # 绑定信号和槽
        self.plainTextEdit.sendmsg.connect(self.slotDoDropEvent)


    def center(self):
        """
        定义一个函数使得窗口居中显示
        """
        # 获取屏幕坐标系
        screen = QDesktopWidget().screenGeometry()
        # 获取窗口坐标系
        size = self.geometry()
        newLeft = (screen.width() - size.width())  2
        newTop = (screen.height() - size.height())  2
        self.move(int(newLeft), int(newTop))


    def slotDoDropEvent(self, strXlsFilePath):
        """
        槽函数：QPlainTextEdit控件拖放excel文件后处理函数
        """
        # 文件存在就加载，不存在就提示。
        if os.path.exists(strXlsFilePath):
            self.plainTextEdit.setPlainText(strXlsFilePath)
            print(strXlsFilePath)
        else:
            # 提示信息框
            win32api.MessageBox(0, "文件路径不存在，请先拖放excel文件到编辑框上！", "提示", win32con.MB_ICONWARNING)




"""=====================================
    主函数
====================================="""
if __name__ == '__main__':
    app = QApplication(sys.argv)
    # 创建主窗口对象
    myPyMainForm = MyPyQTMainForm()
    # 主窗口显示在屏幕中间
    myPyMainForm.center()


    # 禁止最大化按钮
    # myPyMainForm.setWindowFlags(QtCore.Qt.WindowMinimizeButtonHint | QtCore.Qt.WindowCloseButtonHint)
    # 禁止拉伸窗口大小
    # myPyMainForm.setFixedSize(myPyMainForm.width(), myPyMainForm.height())


    # 显示主界面
    myPyMainForm.show()


    sys.exit(app.exec_())