CODEWITHSUNDEEP
pythonpyqtpyqt5qlabel
burntchowmein
burntchowmein

Reputation: 469

Why does the label not fully display?

I am learning how to use PyQt5 and I came across this issue where "my first label" does not complete display on my screen.

Display after running the code:

enter image description here

Code:

from PyQt5 import QtWidgets, QtCore, QtGui
from PyQt5.QtCore import *
from PyQt5.QtGui  import *
from PyQt5.QtWidgets import QApplication, QMainWindow
import sys

QtWidgets.QApplication.setAttribute(QtCore.Qt.AA_EnableHighDpiScaling, True) #enable highdpi scaling
QtWidgets.QApplication.setAttribute(QtCore.Qt.AA_UseHighDpiPixmaps, True) #use highdpi icons

def window():
  app = QApplication(sys.argv)
  win = QMainWindow()
  win = QMainWindow()
  win.setGeometry(200, 200, 400, 400)
  win.setWindowTitle("Tech with Aeijan")
  label = QtWidgets.QLabel(win)
  label.setText("my first label!")
  label.move(50,50)

  win.show()
  sys.exit(app.exec_())

window()

Upvotes: 1

Views: 3428

Answers (1)

musicamante
musicamante

Reputation: 48499

QLabel adapts its contents based on the (possible) parent layout manager, but you didn't use any, so it doesn't know how to correctly display itself or adapt its size to do that.

The simplest solution is to call label.adjustSize(), which will cause the label to resize itself so that it will be able to display its contents.

That wouldn't be a very good idea, though: you are trying to use a fixed position for a widget (which is normally considered a bad thing to do, for plenty of reasons); the result will be that if the label text is too big and the user resizes the window, the text won't be completely visible as it should be, nor the label would know how to resize or eventually wrap its contents to do ensure that all its text is shown.

The better approach is to use a layout manager, but that is a solution reserved for simpler widgets (like a QWidget or a QDialog); a QMainWindow doesn't work like that, and it requires a central widget to be set to ensure that its contents are correctly displayed and managed.

In your case, you could simply use self.setCentralWidget(label), but that would prevent you to add any other widget to your window.

A "container" widget should be used instead, and that widget would be set as the central one for the main window; then you can set a layout for that widget and add the label to it:

def window():
    app = QApplication(sys.argv)
    win = QMainWindow()

    central = QWidget()
    win.setCentralWidget(central)

    layout = QVBoxLayout()
    central.setLayout(layout)
    # alternatively, the above is the same as this:
    # layout = QVBoxLayout(central)

    label = QtWidgets.QLabel(win)
    label.setText("my first label!")
    layout.addWidget(label)

    # ...

Upvotes: 3

Related Questions