Can't use "setGraphicsEffect"?

Rangerguy128

I've been trying to implement methods to add some shadow effects to some parts of the UI (i.e. the header) and was told to import/install PySide, PyQt and QT-PyQt-PySide-Custom-Widgets (note I'm using PyQt5 and PySide6) However, setGraphicsEffects doesn't seem to work. In other words, it acts like there is no said function available. Here's what the code looks like:

shadow_elements = { "left_menu","frame_3", "frame_5", "header", "frame_8"}

class MainWindow(QMainWindow):
        def __init__(self,parent=None):
            QMainWindow.__init__(self)
            self.ui = Ui_MainWindow()
            self.ui.setupUi(self)
            
            self.setMinimumSize(850,600)
            
            for x in shadow_elements:
                
                effect = QtWidgets.QGraphicsDropShadowEffect(self)
                effect.setBlurRadius(18)
                effect.setXOffset(0)
                effect.setYOffset(0)
                effect.setColor(QColor(0,0,0,255))
                getattr(self.ui,x).setGraphicsEffect(effect) #isn't highlighted like the rest of teh functions here
                        
            self.show()

Am I missing something?

SGaist

Hi,

Please provide a complete minimal script that shows the issue.

mpergand

@Rangerguy128

Shadows can't be drawn outside of the parent widget, only inside.
See https://forum.qt.io/post/740663

Rangerguy128

@SGaist Here's the error it gives me when I run the file:

Traceback (most recent call last):
  File "C:\Users\UserPC\OneDrive\Documentos\ProjectSICI\propiedadesmain.py", line 12, in <module>
    from Custom_Widgets.Widgets import *
  File "C:\Users\UserPC\AppData\Local\Programs\Python\Python311\Lib\site-packages\Custom_Widgets\__init__.py", line 12, in <module>
    from Custom_Widgets.Qss.SvgToPngIcons import NewIconsGenerator
  File "C:\Users\UserPC\AppData\Local\Programs\Python\Python311\Lib\site-packages\Custom_Widgets\Qss\SvgToPngIcons.py", line 22, in <module>
    import cairosvg
  File "C:\Users\UserPC\AppData\Local\Programs\Python\Python311\Lib\site-packages\cairosvg\__init__.py", line 26, in <module>
    from . import surface  # noqa isort:skip
    ^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\UserPC\AppData\Local\Programs\Python\Python311\Lib\site-packages\cairosvg\surface.py", line 9, in <module>
    import cairocffi as cairo
  File "C:\Users\UserPC\AppData\Local\Programs\Python\Python311\Lib\site-packages\cairocffi\__init__.py", line 47, in <module>
    cairo = dlopen(
            ^^^^^^^
  File "C:\Users\UserPC\AppData\Local\Programs\Python\Python311\Lib\site-packages\cairocffi\__init__.py", line 44, in dlopen
    raise OSError(error_message)  # pragma: no cover
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
OSError: no library called "cairo-2" was found
no library called "cairo" was found
no library called "libcairo-2" was found
cannot load library 'libcairo.so.2': error 0x7e.  Additionally, ctypes.util.find_library() did not manage to locate a library called 'libcairo.so.2'
cannot load library 'libcairo.2.dylib': error 0x7e.  Additionally, ctypes.util.find_library() did not manage to locate a library called 'libcairo.2.dylib'    
cannot load library 'libcairo-2.dll': error 0x7e.  Additionally, ctypes.util.find_library() did not manage to locate a library called 'libcairo-2.dll'

As for the full script of the file, here's what I wrote with the imports:

import os
import sys

import csv
from propiedades import *


from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QApplication, QMainWindow
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from Custom_Widgets.Widgets import *
# from PySide6.QtGui import *
# from PySide6.QtCore import *
# from PySide6.QtWidgets import *

shadow_elements = { "left_menu","frame_3", "frame_5", "header", "frame_8"}
from functools import partial

class MainWindow(QMainWindow):
        def __init__(self,parent=None):
            QMainWindow.__init__(self)
            self.ui = Ui_MainWindow()
            self.ui.setupUi(self)
            
            self.setMinimumSize(850,600)
            
            loadJsonStyle(self, self.ui)
            for x in shadow_elements:
                
                effect = QtWidgets.QGraphicsDropShadowEffect(self)
                effect.setBlurRadius(18)
                effect.setXOffset(0)
                effect.setYOffset(0)
                effect.setColor(QColor(0,0,0,255))
                getattr(self.ui,x).setGraphicsEffect(effect)
            
            
            self.show()
            
if __name__ == "__main__":
    import sys
    app = QApplication(sys.argv)
    window = QMainWindow()
    window.show()
    sys.exit(app.exec_())

JonB

@Rangerguy128
In your original post you just said "setGraphicsEffects doesn't seem to work", you did not mention anything about the error you show now? The Custom_Widgets module seems to need this cairo stuff. You seem to be using Windows: do you have a libcairo-2.dll file anywhere at all? Googling libcairo-2.dll shows plenty of results about it being "missing", e.g. maybe Python: OSError: cannot load library libcairo.so.2.

Rangerguy128

@JonB I see, maybe that's also why setGraphicsEffect isn't highlighted like the rest? Is there anyway to import the cairo library? I'm using Python 3.11.9 and I'm not sure if it's because of the version or not (cant use 3.12 as that one doesn't support PyQt6-tools yet)

JonB

@Rangerguy128
This is not my area. I suggested you discover whether libcairo-2.dll exists anywhere for you. Searching for e.g. python cairo indicates to me you have to install it, perhaps via pip or pyPI? You may have done that, but I suspect that is only the bindings for Python? Do you have to install cairo itself as a (binary) package, which includes e.g. libcairo-2.dll, so that the Python bindings can use it?

SGaist

The first thing you should do is avoid star imports. You don't know what you are pulling there and it makes your code less readable and understandable.

Next, remove everything that is not related to your current Qt issue. Deal with each problem one after the other.