Changing the QLabel frameshape

[Stevolution]

I get an error with that line

NameError: name 'QtWidgets' is not defined

Whats the difference between QtWidgets and QWidget?

import sys                                                          # This imports the modules	
import time

from PyQt5.QtWidgets import QApplication, QWidget                   # PyQy5 is the GUI module.   QApplication is part of that module, and QWidget is the Windows interaction class (Keyboard, mouse etc)
from PyQt5.QtGui import QIcon, QPixmap, QImage                      # QImage is a class of PyQt5 that allows image interaction
from PyQt5.uic import loadUi


import opr                                                          # Face tracking Python routine
import comm_ard                                                     # Python routine to handle the serial communications to the Arduino
import random                                                       # Random generator 
import pickle                                                       # Allows you to send data between Python scripts using a byte data stream

import cv2                                                          # Stands for COMPUTER VISION. Allows the code to take information from a visual source

[JonB]

@Stevolution said in Changing the QLabel frameshape:

I get an error with that line
NameError: name 'QtWidgets' is not defined

Show me the line you typed, copied & pasted! Since I use from PyQt5 import QtWidgets all the time...

In the way you now show, it is using my "second approach". You have

from PyQt5.QtWidgets import QApplication, QWidget

so to add references to, say QLabel & QFrame you can either modify to:

from PyQt5.QtWidgets import QApplication, QWidget, QLabel, QFrame

or add a brand new line

from PyQt5.QtWidgets import QLabel, QFrame

Don't forget to read what I wrote earlier about when you use this method,

label.setFrameShape(QtWidgets.QFrame.NoFrame)

becomes

label.setFrameShape(QFrame.NoFrame)

Whats the difference between QtWidgets and QWidget?

PyQt5.QtWidgets is a module (like a namespace if you're familiar with that term). That module contains many classes. QWidget is a class in the module QtWidgets. That module contains other additional widget-y classes, such as QFrame.

[Stevolution]

@JonB said in Changing the QLabel frameshape:

PyQt5.QtWidgets import QApplication, QWidget, QLabel, QFrame

PyQt5.QtWidgets import QApplication, QWidget, QLabel, QFrame has fixed the issue.
I didn't realise I needed to add those to the declared list.

Thank you very much for your time and patience

[JonB]

@Stevolution
As I wrote earlier, if you go for the from PyQt5.QtWidgets import Q... route, which is fine, you must now add to that list each time you want to access a specific class, like QWidget or QFrame or QPushButton, and then you can address those by their plain class name, QWidget or QFrame, instead of QtWidgets.QWidget, QtWidgets.QFrame etc.

You may also shortcut having to spell out each class name by going

from PyQt5.QtWidgets import *

This imports as QWidget, QFrame, QPushButton and everything else (non-underscore) in the QtWidgets module, in one go. However, this is usually regarded as poor Python practice [https://docs.python.org/3/tutorial/modules.html].

[Stevolution]

Yes. Many thanks for your excellent assistance

[Stevolution]

Without appearing to be totally thick... it's frustrating that I have sorted out all the comms to the Arduino, camera importing etc...

but cannot get my head around this formatting to change text properties.

How would I change the font size of a label? All my efforts have failed.
I had to import the class QFrame to change the frame, but QFont gives a syntax

This is clearly wrong...

self.COMConnectLabel.setFontSize(14);

[Stevolution]

I think I need to walk away for a while. Made great progress today....

But still can't change that text font size!

[Stevolution]

@Stevolution Thank you Denni. I will have another look at that in a while.

Just trying to work out why my routine is throwing up an exception when I transfer 6 bytes of data from my Arduino to my Python process.

I can print all six bytes correctly in the decoding routine (called Comm_ard.py), but when I use bytes 5 or 6 in the Python code, it throws up an exception error. Hmm

[Stevolution]

OK. Fixed the exception issue.

NOTHING I try will let me change the font size. Spent so much time on this. You suggestions Denni didin't work.
It's clearly me, but no idea what I am doing wrong. Declared QFont at the start etc.

It's maddening how something so stupid takes so long

[Stevolution]

@Denni-0

Yes, but I need to implement it in my code. That is a lot of code just to change a font size! Thank you Denni... I do appreciate it.

I don't really understand why it's so complicated. Why can you not just say: self.COMConnectLabel.setFontSize(14);

Anyway, I will sort it out

[JonB]

@Stevolution

That is a lot of code just to change a font size!
I don't really understand why it's so complicated. Why can you not just say: self.COMConnectLabel.setFontSize(14);

You only need the lines @Denni-0 gave you earlier:

MyFont = QFont()
MyFont.setPointSize(14)

MyLabel = QLabel()
MyLabel.setFont(MyFont)

That's 3 lines to change the label's font. That's just what calls Qt has provided. If you wanted to be able to go self.COMConnectLabel.setFontSize(14) you could subclass your labels to add setFontSize(size) as an available method.

[Stevolution]

S0..

        MyFont = QFont()
        MyFont.setPointSize(18)

        self.COMConnectLabel = QLabel()
        self.COMConnectLabel.setFont(MyFont)

This freezes my routine

[Stevolution]

Ha ... thanks Denni
Yes, using QT Designer. Got nearly everything working except this and a ProgressBar that keeps throwing up an exception.

I will see if I can make a smaller bit of code and either get it working, or post it for your advice.
Thanks

[Stevolution]

Thanks Denni, that is a very kind offer.

The reason I started with QT Designer, is I started with a project that someone else designed using QT Designer, and I have adapted it to my needs.
I don't know Python. I have come from Arduino programming and its pretty different.

I have reverse engineered the code, and made far more progress than I thought I would have in a few days.

I have some fundamental issue somewhere. I have links to the labels, tick boxes, buttons etc all working fine.

But, I just cannot get the font size to change or the ProgressBar to work.

[Stevolution]

GOT IT

        font = self.COMConnectLabel.font()                                                         
        font.setPointSize(14)
        self.COMConnectLabel.setFont(font)

This worked. Trial and error.

Now it I need to fix the progress bar

[Stevolution]

Right, the problem with the progressbar is the co-ords.

In QT Designer, it shows 480,60 20x191 as the co-ords for the Progressbar

But i declare:

    self.Temp_bar = QProgressBar(self)
    self.Temp_bar.setGeometry(480, 60, 20 , 191)
    self.Temp_bar.setValue(350)

and the Progress bar is way off the screen (so it was working - just not visible).

The actual co-ords to get it anywhere near the position in QT Designer are (502, 820, 50 , 191) And they are not exact.
Also, its going from top to bottom instead of as stated in QT Designer, and it's the wrong colour.

So... have I made my own progress bar that has nothing to do with the design I made in QT Designer, or and I missing something that links them together? Hmm

Edit/update.

OK, its all incorrect. From what I understand, for some reason... all the settings in QT Designer are lost.
I would need to set up a new style sheet to reproduce the one I made in QT Designer. That seems pointless.

Is there a simpler way to directly draw a progressbar style 'box' that goes vertically up the screen dependant on a variable (I know there will be... I just don't know it yet).

I do have to say the mixed/incorrect/random information about implementing these functions in QT Designer is very frustrating.

[jsulm]

@Stevolution said in Changing the QLabel frameshape:

In QT Designer, it shows 480,60 20x191 as the co-ords for the Progressbar
But i declare:

One moment: you have one progress bar in designer, but then you add one in code? Why don't you use the one from designer?

[JonB]

@Stevolution
Just to say: there is absolutely nothing wrong with using Qt Designer to design your UI, and auto-generate the Python code which implements it, as you have been doing. The code it generates is easy to understand (if you choose to look at it, you don't have to), and essentially does what you would have to do yourself if you choose to do it manually instead. Especially if you are a beginner, it can ease you into Qt programming without having to learn everything about the classes from the outset. As you have discovered, you can mix static design-time elements with dynamically-created run-time elements as you please.

Plenty of other toolsets have a visual designer as well as run-time coding. It is largely a matter of personal preference which you choose to use, and there are pros & cons of each approach. Many, but not all, Qt developers use Designer. This applies whether you use C++ or Python. So feel free to follow your chosen path either way.

[Stevolution]

@jsulm

Well this is what I am trying to learn. This is my first Python code attempt!

How do I access the one I designed in QT Designer? Googling shows examples such as the one I posted/used, but as you say... I think I have made another progress bar, rather than manage to access the one I made in QT Designer.

My QT Designer progress bar is called Temp_bar, so I am not sure why it is not accessing it.
If I don't state the setGeometry, then I cannot see any ProgressBar

[Stevolution]

@JonB

Where is the code it generates?