[FIXED] Color individual horizontal headers of QTableWidget in PyQt

Issue

I have a QTableWidget where I would like to color individual horizontal header items based on some criterion.

What I have come up with so far:

stylesheet = "::section{Background-color:rgb(190,1,1)}"
self.ui.Table.horizontalHeader().setStyleSheet(stylesheet)

This works, however it colors all headers simultaneously without me being able to change the color of an individual header. So the next logical step would be:

self.ui.Table.horizontalHeaderItem(0).setStyleSheet(stylesheet) 

This does not work, as a single header item does not support setting a stylesheet.

Finally:

self.ui.Table.horizontalHeaderItem(0).setBackgroundColor(QtCore.Qt.red)

This runs just fine without python complaining, however it does not seem to have any effect on the background color whatsoever.

I already looked at this answer, it is what sparked my first attempt. However it only deals with coloring all headers with the same color.

How can I color the headers individually?

Solution

You can do this by using the following recipe:

import sys
from PyQt5 import QtCore, QtGui, QtWidgets

class MyFrame(QtWidgets.QFrame):
    def __init__(self, parent=None,initials=None):
        QtWidgets.QFrame.__init__(self, parent)
        self.table = QtWidgets.QTableWidget(5,3,self)
        self.table.move(30,30)
        self.table.resize(400,300)

        item1 = QtWidgets.QTableWidgetItem('red')
        item1.setBackground(QtGui.QColor(255, 0, 0))
        self.table.setHorizontalHeaderItem(0,item1)

        item2 = QtWidgets.QTableWidgetItem('green')
        item2.setBackground(QtGui.QColor(0, 255, 0))
        self.table.setHorizontalHeaderItem(1,item2)

        item3 = QtWidgets.QTableWidgetItem('blue')
        item3.setBackground(QtGui.QColor(0, 0, 255))
        self.table.setHorizontalHeaderItem(2,item3)

if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    app.setStyle(QtWidgets.QStyleFactory.create('Fusion')) # won't work on windows style.
    Frame = MyFrame(None)
    Frame.resize(500,400)
    Frame.show()
    app.exec_()

, that will result in this:

One thing you must consider is that Windows style does not let you do this. This is the reason why I had to change the style to Fusion.

Answered By - armatita