Why lineEdit is showing like this?

Question

I want to edit lineEdit from an .ui file which is imported. I would not like to convert .ui to .py code because .ui will be changed frequently and converting to .py and import from the .py seems a longer proccess for me.

When run the code, It seems that instead of one, two seperate lineEdit is generated in mainwindow. Probably parent-subclass relationships due to formclass ui but I could not understand why?

from PyQt5 import QtCore, QtGui, QtWidgets, uic
import sys,re
import pandas as pd
from glob import glob
import os


ui,base=uic.loadUiType("test.ui")
class MainWindow(ui,base):
    def __init__(self, parent=None):
        base.__init__(self,parent)
        # initializes the user interface

        self.setupUi(self)
        self.lineEdit=lineEdit(self.lineEdit)

class lineEdit(QtWidgets.QLineEdit):
     def __init__(self, parent):
        super().__init__(parent)   

        self.parent=parent
        self.setAcceptDrops(True)
        self.setDragEnabled(True)


     def dragEnterEvent(self, event):

        if event.mimeData().hasUrls:

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


         mymodel=QtGui.QStandardItemModel()

         if event.mimeData().hasUrls:
            event.setDropAction(QtCore.Qt.CopyAction)

            for url in event.mimeData().urls():
                links=url.toLocalFile()
            self.setText(links)
            return links

if __name__ == "__main__":


    if not QtWidgets.QApplication.instance():
        app = QtWidgets.QApplication(sys.argv)
    else:
        app = QtWidgets.QApplication.instance() 


    MainWindow=MainWindow()
    MainWindow.show()
    app.exec_()

Changed self.lineEdit=lineEdit(self) resulted two seperate lineEdit while self.lineEdit=lineEdit(self.lineEdit) cause two coincident lineEdit widget at the same coordinates of mainwindow.

Any help would be nice...

Edit:test.ui is here https://drive.google.com/open?id=1oe6z2BaiLYm0mo-nadmDvzsoLHXnwkfm

eyllanesc · Accepted Answer

Explanation:

You are assuming that with line self.lineEdit=lineEdit(self.lineEdit) it replaces QLineEdit, nope. To replace a variable with another variable does not imply the elimination of the previous variable since the ownership of the previous QLineEdit has it Qt, in your case you are indicating that you are creating another QLineEdit that will be child of the first since you pass the parent as the first parameter so it will be located regarding the position of the QLineEdit.

Solution:

If you want to use a custom widget in the .ui then you must promote the widget, for this you can follow the following posts:

Considering the above, the solution is:

├── lineedit.py
├── main.py
└── test.ui

main.py

import os
import sys

from PyQt5 import QtCore, QtGui, QtWidgets, uic


current_dir = os.path.dirname(os.path.realpath(__file__))

Ui, Base = uic.loadUiType(os.path.join(current_dir, "test.ui"))


class MainWindow(Base, Ui):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setupUi(self)


if __name__ == "__main__":

    app = QtWidgets.QApplication.instance()
    if app is None:
        app = QtWidgets.QApplication(sys.argv)

    w = MainWindow()
    w.show()
    sys.exit(app.exec_())

lineedit.py

from PyQt5 import QtCore, QtWidgets


class LineEdit(QtWidgets.QLineEdit):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setAcceptDrops(True)
        self.setDragEnabled(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):
        if event.mimeData().hasUrls():
            for url in event.mimeData().urls():
                links = url.toLocalFile()
                self.setText(links)

test.ui



 MainWindow
 
  
   
    0
    0
    800
    646
   
  
  
   A.G_bulucu
  
  
   
    
     
      80
      30
      311
      20
     
    
    
     
      0
      0
     
    
    
     
      400
      16777215
     
    
    
     Qt::ImhNone
    
    
     
    
    
     true
    
    
     QLineEdit::Normal
    
    
     Qt::AlignJustify|Qt::AlignVCenter
    
    
     false
    
    
     true
    
   
   
    
     
      10
      30
      61
      16
     
    
    
     File
    
   
   
    
     
      400
      30
      75
      23
     
    
    
     open
    
   
  
  
   
    
     0
     0
     800
     30
    
   
  
  
 
 
  
   LineEdit
   QLineEdit
   lineedit

Why lineEdit is showing like this?

Answers (2)

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