QLineEdit and position within QgridLayout

[Bauke]

I have dynamically created lineedits(QLineEdit) in gridLayout in pyQT5. How can I get the position (index) of the edited lineEdit in the layout?

[SGaist]

Hi and welcome to devnet,

Why do you need that information ?

[Bauke]

Based on the position I have to calculate some other lineEdits. Its a kind of very little spreadsheet prog. Below a picture (I hope)


[SGaist]

Then why not use a QTableWidget ?

In any case, rather than relying on the position of your line edits, keep a reference to them for doing your manipulation. That will keep your code cleaner and more readable.

[Bauke]

Will try that! I am very new to QT5 and just trying to get some results.
Thanks for your answer!

And how can I keep a ref. to my line edits? Its dynamicly build and all the line edits are called "cell"

Regards,
Bauke

PS: Had to wait before I could post again.

[SGaist]

That's always the same layout with the same line edits at the same place ?

[Bauke]

@SGaist
Yes it is. I now have the reference of the sending cell with:
cell.textChanged.connect(lambda x, pos=positions: self.my_custom_fn(x, pos))
Or is there a better way?
It gives me a tuple with row, col. Ex. row 2 and col 2.
Now I do some calculation and want to put the result in cell(row 2, col 3) (disabled) with cell.setText().
But how do I reach the cell at row 2 col 3?

I will look at the TableWdget, but this should work too.

[SGaist]

Then you can use something like:

self.aantal_btc = QtWidgets.QLineEdit()
grid_layout.addWidget(self.aantal_btc, 0, 1);

Then it's easy to update the line edit for "Aantal BTC"

[Bauke]

But that will be the end of the dynamic part, won't it?

Here is the code sofar:

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *
import sys

class MainWindow(QMainWindow):

    def __init__(self, *args, **kwargs):
        super(MainWindow, self).__init__(*args, **kwargs)

        self.setWindowTitle("Waarde Coins")

        grid = QGridLayout()
        self.setLayout(grid)

        # create matrix: "le" wordt een LineEdit, "" wordt overgeslagen en de rest wordt Label
        cells = ["", "<b>Totaal</b>", "<b>BTC</b>", "<b>ETH</b>", "<b>LTC</b>",
                 "Aantal:", "", "le", "le", "le",
                 "Aantal DGB:", "", "le", "le", "le",
                 "Waarde USD:", "le", "le", "le", "le",
                 "<b>Waarde EURO:</b>", "le", "le", "le", "le",
                 "Investering in EURO:", "le", "", "", "", ]
        positions = [(row, col) for row in range(6) for col in range(5)]
        for positions, cells in zip(positions, cells):
            # Create the labels and lineEdits from  matrix
            # print("Positions (row,col):", "cel" + str(positions[0]) + "-" + str(positions[1]))
            cell = name = "cel" + str(positions[0]) + "-" + str(positions[1])
            if cells == "":
                continue
            elif cells == 'le':
                cell = QLineEdit()
                cell.setAlignment(Qt.AlignRight)
                cell.textChanged.connect(lambda x, pos=positions, name=name: self.my_custom_fn(x, pos, name))
                if positions[0] == 3 or positions[0] == 4:
                    cell.setDisabled(1)
            else:
                cell = QLabel(cells)
                if positions[0] == 0:
                    cell.setAlignment(Qt.AlignCenter)

            grid.addWidget(cell, *positions)

        widget = QWidget()
        widget.setLayout(grid)

        self.setCentralWidget(widget)

    def my_custom_fn(self, a, pos, name):
        print("Invoer : ", a)
        print("Pos    : ", pos)
        print("Name   : ", name)

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

[SGaist]

Rather than creating everything in your MainWindow class, create one widget that is your "spread sheet". You use a QHash to associate your cells with some key to return them quickly rather than having to scan the grid layout until you find the one you want.

[Bauke]

@SGaist
Thanks, QHash is very new to me. Will look into that.