Corrupted icons with PyQt 5.12

[Adanteh]

Hey, I had some issues with a corrupted windows profile, and after restoring it for some reason I can't get QtAwesome to show icons anymore. I did do a pip uninstall and install of qtawesome again. Normal QIcon are fine. Not sure on the technical side of this or how it could at all be connected, but I can't figure it out for the life of me.

Icons are being added normally as

import qtawesome as qta
qta.icon("fa5s.mountain") 

[ccordoba12]

This is a problem with PyQt5 5.12 and we don't know how to fix it yet. So please downgrade to 5.11 in the meantime.

[Adanteh]

Thanks a lot, that fixed it.

[stonebig]

an alternative is to switch to Spyder2 theme, instead of downgrading.

[ddemidov]

Can this be reopened until the issue with pyqt 5.12 is resolved?

[stonebig]

Pyqt5 mailing list reference: https://www.riverbankcomputing.com/pipermail/pyqt/2019-February/041376.html

[ddemidov]

Just a note: if I put some prints into CharIconEngine.__init__(), CharIconEngine.paint(), and CharIconEngine.pixmap() here:

qtawesome/qtawesome/iconic_font.py

Lines 145 to 163 in 364d6fd

	class CharIconEngine(QIconEngine):
	"""Specialization of QIconEngine used to draw font-based icons."""
	def __init__(self, iconic, painter, options):
	super(CharIconEngine, self).__init__()
	self.iconic = iconic
	self.painter = painter
	self.options = options
	def paint(self, painter, rect, mode, state):
	self.painter.paint(
	self.iconic, painter, rect, mode, state, self.options)
	def pixmap(self, size, mode, state):
	pm = QPixmap(size)
	pm.fill(Qt.transparent)
	self.paint(QPainter(pm), QRect(QPoint(0, 0), size), mode, state)
	return pm

I can see that __init__() is being called, but neither paint() nor pixmap() are ever entered. Is that normal?

We are using qtawesome in our own project (thanks for the great library btw), so unfortunately switching to Spyder2 theme is not an option.

[ccordoba12]

Thanks for digging into this! Did you try it?

@goanpeca, what do you think?

[ddemidov]

Just tried on a machine with pyqt 5.11 installed, and I here can see that both paint and pixmap are called. Here is the patch to iconic_font.py:

diff --git a/qtawesome/iconic_font.py b/qtawesome/iconic_font.py
index 0fb2896..727a557 100644
--- a/qtawesome/iconic_font.py
+++ b/qtawesome/iconic_font.py
@@ -147,16 +147,19 @@ class CharIconEngine(QIconEngine):
     """Specialization of QIconEngine used to draw font-based icons."""
 
     def __init__(self, iconic, painter, options):
+        print('init')
         super(CharIconEngine, self).__init__()
         self.iconic = iconic
         self.painter = painter
         self.options = options
 
     def paint(self, painter, rect, mode, state):
+        print('paint')
         self.painter.paint(
             self.iconic, painter, rect, mode, state, self.options)
 
     def pixmap(self, size, mode, state):
+        print('pixmap')
         pm = QPixmap(size)
         pm.fill(Qt.transparent)
         self.paint(QPainter(pm), QRect(QPoint(0, 0), size), mode, state)

I called example.py with the patch applied to test this.

[goanpeca]

I would need to look deeper into this, I don't recall working on that side, was more @SylvainCorlay I believe :-p

[ddemidov]

https://www.riverbankcomputing.com/pipermail/pyqt/2019-March/041459.html